slave.cc 216 KB
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/* Copyright (c) 2000, 2012, Oracle and/or its affiliates.
   Copyright (c) 2008, 2011, Monty Program Ab
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; version 2 of the License.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
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/**
  @addtogroup Replication
  @{

  @file

  @brief Code to run the io thread and the sql thread on the
  replication slave.
*/

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#include "sql_priv.h"
#include "my_global.h"
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#include "slave.h"
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#include "sql_parse.h"                         // execute_init_command
#include "sql_table.h"                         // mysql_rm_table
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#include "rpl_mi.h"
#include "rpl_rli.h"
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#include "sql_repl.h"
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#include "rpl_filter.h"
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#include "repl_failsafe.h"
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#include "transaction.h"
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#include <thr_alarm.h>
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#include <my_dir.h>
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#include <sql_common.h>
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#include <errmsg.h>
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#include <mysqld_error.h>
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#include <mysys_err.h>
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#include "rpl_handler.h"
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#include <signal.h>
#include <mysql.h>
#include <myisam.h>

#include "sql_base.h"                           // close_thread_tables
#include "tztime.h"                             // struct Time_zone
#include "log_event.h"                          // Rotate_log_event,
                                                // Create_file_log_event,
                                                // Format_description_log_event
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#ifdef HAVE_REPLICATION

#include "rpl_tblmap.h"
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#include "debug_sync.h"
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#define FLAGSTR(V,F) ((V)&(F)?#F" ":"")
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#define MAX_SLAVE_RETRY_PAUSE 5
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/*
  a parameter of sql_slave_killed() to defer the killed status
*/
#define SLAVE_WAIT_GROUP_DONE 60
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bool use_slave_mask = 0;
MY_BITMAP slave_error_mask;
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char slave_skip_error_names[SHOW_VAR_FUNC_BUFF_SIZE];
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char* slave_load_tmpdir = 0;
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Master_info *active_mi= 0;
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Master_info_index *master_info_index;
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my_bool replicate_same_server_id;
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ulonglong relay_log_space_limit = 0;
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LEX_STRING default_master_connection_name= { (char*) "", 0 };
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/*
  When slave thread exits, we need to remember the temporary tables so we
  can re-use them on slave start.

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  TODO: move the vars below under Master_info
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*/
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int disconnect_slave_event_count = 0, abort_slave_event_count = 0;
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static pthread_key(Master_info*, RPL_MASTER_INFO);

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enum enum_slave_reconnect_actions
{
  SLAVE_RECON_ACT_REG= 0,
  SLAVE_RECON_ACT_DUMP= 1,
  SLAVE_RECON_ACT_EVENT= 2,
  SLAVE_RECON_ACT_MAX
};

enum enum_slave_reconnect_messages
{
  SLAVE_RECON_MSG_WAIT= 0,
  SLAVE_RECON_MSG_KILLED_WAITING= 1,
  SLAVE_RECON_MSG_AFTER= 2,
  SLAVE_RECON_MSG_FAILED= 3,
  SLAVE_RECON_MSG_COMMAND= 4,
  SLAVE_RECON_MSG_KILLED_AFTER= 5,
  SLAVE_RECON_MSG_MAX
};

static const char *reconnect_messages[SLAVE_RECON_ACT_MAX][SLAVE_RECON_MSG_MAX]=
{
  {
    "Waiting to reconnect after a failed registration on master",
    "Slave I/O thread killed while waitnig to reconnect after a failed \
registration on master",
    "Reconnecting after a failed registration on master",
    "failed registering on master, reconnecting to try again, \
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log '%s' at position %s%s",
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    "COM_REGISTER_SLAVE",
    "Slave I/O thread killed during or after reconnect"
  },
  {
    "Waiting to reconnect after a failed binlog dump request",
    "Slave I/O thread killed while retrying master dump",
    "Reconnecting after a failed binlog dump request",
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    "failed dump request, reconnecting to try again, log '%s' at position %s%s",
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    "COM_BINLOG_DUMP",
    "Slave I/O thread killed during or after reconnect"
  },
  {
    "Waiting to reconnect after a failed master event read",
    "Slave I/O thread killed while waiting to reconnect after a failed read",
    "Reconnecting after a failed master event read",
    "Slave I/O thread: Failed reading log event, reconnecting to retry, \
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log '%s' at position %s%s",
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    "",
    "Slave I/O thread killed during or after a reconnect done to recover from \
failed read"
  }
};
 

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typedef enum { SLAVE_THD_IO, SLAVE_THD_SQL} SLAVE_THD_TYPE;
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static int process_io_rotate(Master_info* mi, Rotate_log_event* rev);
static int process_io_create_file(Master_info* mi, Create_file_log_event* cev);
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static bool wait_for_relay_log_space(Relay_log_info* rli);
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static inline bool io_slave_killed(THD* thd,Master_info* mi);
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static inline bool sql_slave_killed(THD* thd,Relay_log_info* rli);
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static int init_slave_thread(THD* thd, Master_info *mi,
                             SLAVE_THD_TYPE thd_type);
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static void print_slave_skip_errors(void);
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static int safe_connect(THD* thd, MYSQL* mysql, Master_info* mi);
static int safe_reconnect(THD* thd, MYSQL* mysql, Master_info* mi,
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                          bool suppress_warnings);
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static int connect_to_master(THD* thd, MYSQL* mysql, Master_info* mi,
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                             bool reconnect, bool suppress_warnings);
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static Log_event* next_event(Relay_log_info* rli);
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static int queue_event(Master_info* mi,const char* buf,ulong event_len);
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static int terminate_slave_thread(THD *thd,
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                                  mysql_mutex_t *term_lock,
                                  mysql_cond_t *term_cond,
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                                  volatile uint *slave_running,
                                  bool skip_lock);
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static bool check_io_slave_killed(THD *thd, Master_info *mi, const char *info);
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static bool send_show_master_info_header(THD *thd, bool full,
                                         size_t gtid_pos_length);
static bool send_show_master_info_data(THD *thd, Master_info *mi, bool full,
                                       String *gtid_pos);
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/*
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  Find out which replications threads are running
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  SYNOPSIS
    init_thread_mask()
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    mask                Return value here
    mi                  master_info for slave
    inverse             If set, returns which threads are not running
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  IMPLEMENTATION
    Get a bit mask for which threads are running so that we can later restart
    these threads.

  RETURN
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    mask        If inverse == 0, running threads
                If inverse == 1, stopped threads
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*/

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void init_thread_mask(int* mask,Master_info* mi,bool inverse)
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{
  bool set_io = mi->slave_running, set_sql = mi->rli.slave_running;
  register int tmp_mask=0;
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  DBUG_ENTER("init_thread_mask");

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  if (set_io)
    tmp_mask |= SLAVE_IO;
  if (set_sql)
    tmp_mask |= SLAVE_SQL;
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  if (inverse)
    tmp_mask^= (SLAVE_IO | SLAVE_SQL);
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  *mask = tmp_mask;
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  DBUG_VOID_RETURN;
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}

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/*
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  lock_slave_threads()
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*/
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void lock_slave_threads(Master_info* mi)
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{
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  DBUG_ENTER("lock_slave_threads");

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  //TODO: see if we can do this without dual mutex
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  mysql_mutex_lock(&mi->run_lock);
  mysql_mutex_lock(&mi->rli.run_lock);
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  DBUG_VOID_RETURN;
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}

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/*
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  unlock_slave_threads()
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*/
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void unlock_slave_threads(Master_info* mi)
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{
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  DBUG_ENTER("unlock_slave_threads");

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  //TODO: see if we can do this without dual mutex
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  mysql_mutex_unlock(&mi->rli.run_lock);
  mysql_mutex_unlock(&mi->run_lock);
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  DBUG_VOID_RETURN;
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}

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#ifdef HAVE_PSI_INTERFACE
static PSI_thread_key key_thread_slave_io, key_thread_slave_sql;

static PSI_thread_info all_slave_threads[]=
{
  { &key_thread_slave_io, "slave_io", PSI_FLAG_GLOBAL},
  { &key_thread_slave_sql, "slave_sql", PSI_FLAG_GLOBAL}
};

static void init_slave_psi_keys(void)
{
  const char* category= "sql";
  int count;

  if (PSI_server == NULL)
    return;

  count= array_elements(all_slave_threads);
  PSI_server->register_thread(category, all_slave_threads, count);
}
#endif /* HAVE_PSI_INTERFACE */
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static bool slave_init_thread_running;


pthread_handler_t
handle_slave_init(void *arg __attribute__((unused)))
{
  THD *thd;

  my_thread_init();
  thd= new THD;
  thd->thread_stack= (char*) &thd;           /* Set approximate stack start */
  mysql_mutex_lock(&LOCK_thread_count);
  thd->thread_id= thread_id++;
  mysql_mutex_unlock(&LOCK_thread_count);
  thd->store_globals();

  thd_proc_info(thd, "Loading slave GTID position from table");
  if (rpl_load_gtid_slave_state(thd))
    sql_print_warning("Failed to load slave replication state from table "
                      "%s.%s: %u: %s", "mysql",
                      rpl_gtid_slave_state_table_name.str,
                      thd->stmt_da->sql_errno(), thd->stmt_da->message());

  mysql_mutex_lock(&LOCK_thread_count);
  delete thd;
  mysql_mutex_unlock(&LOCK_thread_count);
  my_thread_end();

  mysql_mutex_lock(&LOCK_thread_count);
  slave_init_thread_running= false;
  mysql_cond_signal(&COND_thread_count);
  mysql_mutex_unlock(&LOCK_thread_count);

  return 0;
}


static int
run_slave_init_thread()
{
  pthread_t th;

  slave_init_thread_running= true;
  if (mysql_thread_create(key_thread_slave_init, &th, NULL,
                          handle_slave_init, NULL))
  {
    sql_print_error("Failed to create thread while initialising slave");
    return 1;
  }

  mysql_mutex_lock(&LOCK_thread_count);
  while (slave_init_thread_running)
    mysql_cond_wait(&COND_thread_count, &LOCK_thread_count);
  mysql_mutex_unlock(&LOCK_thread_count);

  return 0;
}


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/* Initialize slave structures */
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int init_slave()
{
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  DBUG_ENTER("init_slave");
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  int error= 0;
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#ifdef HAVE_PSI_INTERFACE
  init_slave_psi_keys();
#endif

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  if (run_slave_init_thread())
    return 1;

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  /*
    This is called when mysqld starts. Before client connections are
    accepted. However bootstrap may conflict with us if it does START SLAVE.
    So it's safer to take the lock.
  */
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  mysql_mutex_lock(&LOCK_active_mi);
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  if (pthread_key_create(&RPL_MASTER_INFO, NULL))
    goto err;
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  master_info_index= new Master_info_index;
  if (!master_info_index || master_info_index->init_all_master_info())
  {
    sql_print_error("Failed to initialize multi master structures");
    mysql_mutex_unlock(&LOCK_active_mi);
    DBUG_RETURN(1);
  }
  if (!(active_mi= new Master_info(&default_master_connection_name,
                                   relay_log_recovery)) ||
      active_mi->error())
  {
    delete active_mi;
    active_mi= 0;
    goto err;
  }

  if (master_info_index->add_master_info(active_mi, FALSE))
  {
    delete active_mi;
    active_mi= 0;
    goto err;
  }

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  /*
    If --slave-skip-errors=... was not used, the string value for the
    system variable has not been set up yet. Do it now.
  */
  if (!use_slave_mask)
  {
    print_slave_skip_errors();
  }

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  /*
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    If master_host is not specified, try to read it from the master_info file.
    If master_host is specified, create the master_info file if it doesn't
    exists.
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  */
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  if (init_master_info(active_mi,master_info_file,relay_log_info_file,
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                       1, (SLAVE_IO | SLAVE_SQL)))
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  {
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    sql_print_error("Failed to initialize the master info structure");
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    goto err;
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  }
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  /* If server id is not set, start_slave_thread() will say it */

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  if (active_mi->host[0] && !opt_skip_slave_start)
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  {
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    if (start_slave_threads(1 /* need mutex */,
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                            0 /* no wait for start*/,
                            active_mi,
                            master_info_file,
                            relay_log_info_file,
                            SLAVE_IO | SLAVE_SQL))
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    {
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      sql_print_error("Failed to create slave threads");
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      goto err;
    }
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  }

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end:
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  mysql_mutex_unlock(&LOCK_active_mi);
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  DBUG_RETURN(error);
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err:
  sql_print_error("Failed to allocate memory for the Master Info structure");
  error= 1;
  goto end;
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}
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/*
  Updates the master info based on the information stored in the
  relay info and ignores relay logs previously retrieved by the IO 
  thread, which thus starts fetching again based on to the  
  group_master_log_pos and group_master_log_name. Eventually, the old
  relay logs will be purged by the normal purge mechanism.

  In the feature, we should improve this routine in order to avoid throwing
  away logs that are safely stored in the disk. Note also that this recovery 
  routine relies on the correctness of the relay-log.info and only tolerates 
  coordinate problems in master.info.
  
  In this function, there is no need for a mutex as the caller 
  (i.e. init_slave) already has one acquired.
  
  Specifically, the following structures are updated:
 
  1 - mi->master_log_pos  <-- rli->group_master_log_pos
  2 - mi->master_log_name <-- rli->group_master_log_name
  3 - It moves the relay log to the new relay log file, by
      rli->group_relay_log_pos  <-- BIN_LOG_HEADER_SIZE;
      rli->event_relay_log_pos  <-- BIN_LOG_HEADER_SIZE;
      rli->group_relay_log_name <-- rli->relay_log.get_log_fname();
      rli->event_relay_log_name <-- rli->relay_log.get_log_fname();
  
   If there is an error, it returns (1), otherwise returns (0).
 */
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int init_recovery(Master_info* mi, const char** errmsg)
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{
  DBUG_ENTER("init_recovery");
 
  Relay_log_info *rli= &mi->rli;
  if (rli->group_master_log_name[0])
  {
    mi->master_log_pos= max(BIN_LOG_HEADER_SIZE,
                             rli->group_master_log_pos);
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    strmake_buf(mi->master_log_name, rli->group_master_log_name);
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    sql_print_warning("Recovery from master pos %ld and file %s.",
                      (ulong) mi->master_log_pos, mi->master_log_name);
 
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    strmake_buf(rli->group_relay_log_name, rli->relay_log.get_log_fname());
    strmake_buf(rli->event_relay_log_name, rli->relay_log.get_log_fname());
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    rli->group_relay_log_pos= rli->event_relay_log_pos= BIN_LOG_HEADER_SIZE;
  }
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  DBUG_RETURN(0);
}
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/**
  Convert slave skip errors bitmap into a printable string.
*/

static void print_slave_skip_errors(void)
{
  /*
    To be safe, we want 10 characters of room in the buffer for a number
    plus terminators. Also, we need some space for constant strings.
    10 characters must be sufficient for a number plus {',' | '...'}
    plus a NUL terminator. That is a max 6 digit number.
  */
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  const size_t MIN_ROOM= 10;
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  DBUG_ENTER("print_slave_skip_errors");
  DBUG_ASSERT(sizeof(slave_skip_error_names) > MIN_ROOM);
  DBUG_ASSERT(MAX_SLAVE_ERROR <= 999999); // 6 digits

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  /* Make @@slave_skip_errors show the nice human-readable value.  */
  opt_slave_skip_errors= slave_skip_error_names;

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  if (!use_slave_mask || bitmap_is_clear_all(&slave_error_mask))
  {
    /* purecov: begin tested */
    memcpy(slave_skip_error_names, STRING_WITH_LEN("OFF"));
    /* purecov: end */
  }
  else if (bitmap_is_set_all(&slave_error_mask))
  {
    /* purecov: begin tested */
    memcpy(slave_skip_error_names, STRING_WITH_LEN("ALL"));
    /* purecov: end */
  }
  else
  {
    char *buff= slave_skip_error_names;
    char *bend= buff + sizeof(slave_skip_error_names);
    int  errnum;

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    for (errnum= 0; errnum < MAX_SLAVE_ERROR; errnum++)
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    {
      if (bitmap_is_set(&slave_error_mask, errnum))
      {
        if (buff + MIN_ROOM >= bend)
          break; /* purecov: tested */
        buff= int10_to_str(errnum, buff, 10);
        *buff++= ',';
      }
    }
    if (buff != slave_skip_error_names)
      buff--; // Remove last ','
    if (errnum < MAX_SLAVE_ERROR)
    {
      /* Couldn't show all errors */
      buff= strmov(buff, "..."); /* purecov: tested */
    }
    *buff=0;
  }
  DBUG_PRINT("init", ("error_names: '%s'", slave_skip_error_names));
  DBUG_VOID_RETURN;
}

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/*
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  Init function to set up array for errors that should be skipped for slave
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  SYNOPSIS
    init_slave_skip_errors()
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    arg         List of errors numbers to skip, separated with ','
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  NOTES
    Called from get_options() in mysqld.cc on start-up
*/
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void init_slave_skip_errors(const char* arg)
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{
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  const char *p;
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  DBUG_ENTER("init_slave_skip_errors");

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  if (bitmap_init(&slave_error_mask,0,MAX_SLAVE_ERROR,0))
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  {
    fprintf(stderr, "Badly out of memory, please check your system status\n");
    exit(1);
  }
  use_slave_mask = 1;
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  for (;my_isspace(system_charset_info,*arg);++arg)
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    /* empty */;
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  if (!my_strnncoll(system_charset_info,(uchar*)arg,4,(const uchar*)"all",4))
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  {
    bitmap_set_all(&slave_error_mask);
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    print_slave_skip_errors();
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    DBUG_VOID_RETURN;
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  }
  for (p= arg ; *p; )
  {
    long err_code;
    if (!(p= str2int(p, 10, 0, LONG_MAX, &err_code)))
      break;
    if (err_code < MAX_SLAVE_ERROR)
       bitmap_set_bit(&slave_error_mask,(uint)err_code);
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    while (!my_isdigit(system_charset_info,*p) && *p)
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      p++;
  }
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  /* Convert slave skip errors bitmap into a printable string. */
  print_slave_skip_errors();
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  DBUG_VOID_RETURN;
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}

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static void set_thd_in_use_temporary_tables(Relay_log_info *rli)
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{
  TABLE *table;

  for (table= rli->save_temporary_tables ; table ; table= table->next)
    table->in_use= rli->sql_thd;
}
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int terminate_slave_threads(Master_info* mi,int thread_mask,bool skip_lock)
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{
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  DBUG_ENTER("terminate_slave_threads");

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  if (!mi->inited)
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    DBUG_RETURN(0); /* successfully do nothing */
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  int error,force_all = (thread_mask & SLAVE_FORCE_ALL);
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  mysql_mutex_t *sql_lock = &mi->rli.run_lock, *io_lock = &mi->run_lock;
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  mysql_mutex_t *log_lock= mi->rli.relay_log.get_log_lock();
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  if (thread_mask & (SLAVE_SQL|SLAVE_FORCE_ALL))
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  {
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    DBUG_PRINT("info",("Terminating SQL thread"));
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    mi->rli.abort_slave=1;
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    if ((error=terminate_slave_thread(mi->rli.sql_thd, sql_lock,
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                                      &mi->rli.stop_cond,
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                                      &mi->rli.slave_running,
                                      skip_lock)) &&
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        !force_all)
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      DBUG_RETURN(error);
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    mysql_mutex_lock(log_lock);
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    DBUG_PRINT("info",("Flushing relay-log info file."));
600
    if (current_thd)
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      thd_proc_info(current_thd, "Flushing relay-log info file.");
    if (flush_relay_log_info(&mi->rli))
603
      DBUG_RETURN(ER_ERROR_DURING_FLUSH_LOGS);
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    if (my_sync(mi->rli.info_fd, MYF(MY_WME)))
606 607
      DBUG_RETURN(ER_ERROR_DURING_FLUSH_LOGS);

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    mysql_mutex_unlock(log_lock);
609
  }
610
  if (thread_mask & (SLAVE_IO|SLAVE_FORCE_ALL))
611
  {
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    DBUG_PRINT("info",("Terminating IO thread"));
613
    mi->abort_slave=1;
614
    if ((error=terminate_slave_thread(mi->io_thd, io_lock,
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                                      &mi->stop_cond,
616 617
                                      &mi->slave_running,
                                      skip_lock)) &&
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        !force_all)
619
      DBUG_RETURN(error);
620

621
    mysql_mutex_lock(log_lock);
622 623 624 625

    DBUG_PRINT("info",("Flushing relay log and master info file."));
    if (current_thd)
      thd_proc_info(current_thd, "Flushing relay log and master info files.");
626
    if (flush_master_info(mi, TRUE, FALSE))
627 628
      DBUG_RETURN(ER_ERROR_DURING_FLUSH_LOGS);

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    if (mi->rli.relay_log.is_open() &&
        my_sync(mi->rli.relay_log.get_log_file()->file, MYF(MY_WME)))
631 632 633 634 635
      DBUG_RETURN(ER_ERROR_DURING_FLUSH_LOGS);

    if (my_sync(mi->fd, MYF(MY_WME)))
      DBUG_RETURN(ER_ERROR_DURING_FLUSH_LOGS);

636
    mysql_mutex_unlock(log_lock);
637
  }
638
  DBUG_RETURN(0); 
639 640
}

641

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/**
   Wait for a slave thread to terminate.

   This function is called after requesting the thread to terminate
   (by setting @c abort_slave member of @c Relay_log_info or @c
   Master_info structure to 1). Termination of the thread is
   controlled with the the predicate <code>*slave_running</code>.

   Function will acquire @c term_lock before waiting on the condition
   unless @c skip_lock is true in which case the mutex should be owned
   by the caller of this function and will remain acquired after
   return from the function.

   @param term_lock
          Associated lock to use when waiting for @c term_cond

   @param term_cond
          Condition that is signalled when the thread has terminated

   @param slave_running
          Pointer to predicate to check for slave thread termination

   @param skip_lock
          If @c true the lock will not be acquired before waiting on
          the condition. In this case, it is assumed that the calling
          function acquires the lock before calling this function.

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   @retval 0 All OK ER_SLAVE_NOT_RUNNING otherwise.
670

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   @note  If the executing thread has to acquire term_lock (skip_lock
          is false), the negative running status does not represent
          any issue therefore no error is reported.
674

675 676 677
 */
static int
terminate_slave_thread(THD *thd,
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                       mysql_mutex_t *term_lock,
                       mysql_cond_t *term_cond,
680 681
                       volatile uint *slave_running,
                       bool skip_lock)
682
{
683
  DBUG_ENTER("terminate_slave_thread");
684
  if (!skip_lock)
685
  {
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686
    mysql_mutex_lock(term_lock);
687 688 689
  }
  else
  {
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    mysql_mutex_assert_owner(term_lock);
691
  }
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  if (!*slave_running)
  {
    if (!skip_lock)
695
    {
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      /*
        if run_lock (term_lock) is acquired locally then either
        slave_running status is fine
      */
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      mysql_mutex_unlock(term_lock);
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      DBUG_RETURN(0);
    }
    else
    {
705
      DBUG_RETURN(ER_SLAVE_NOT_RUNNING);
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    }
  }
  DBUG_ASSERT(thd != 0);
709
  THD_CHECK_SENTRY(thd);
710

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  /*
712
    Is is critical to test if the slave is running. Otherwise, we might
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    be referening freed memory trying to kick it
714
  */
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  while (*slave_running)                        // Should always be true
717
  {
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    int error __attribute__((unused));
719
    DBUG_PRINT("loop", ("killing slave thread"));
720

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    mysql_mutex_lock(&thd->LOCK_thd_data);
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#ifndef DONT_USE_THR_ALARM
    /*
      Error codes from pthread_kill are:
      EINVAL: invalid signal number (can't happen)
      ESRCH: thread already killed (can happen, should be ignored)
    */
728
    int err __attribute__((unused))= pthread_kill(thd->real_id, thr_client_alarm);
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    DBUG_ASSERT(err != EINVAL);
#endif
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    thd->awake(NOT_KILLED);

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    mysql_mutex_unlock(&thd->LOCK_thd_data);
734

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    /*
      There is a small chance that slave thread might miss the first
      alarm. To protect againts it, resend the signal until it reacts
738 739
    */
    struct timespec abstime;
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    set_timespec(abstime,2);
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    error= mysql_cond_timedwait(term_cond, term_lock, &abstime);
742
    DBUG_ASSERT(error == ETIMEDOUT || error == 0);
743
  }
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  DBUG_ASSERT(*slave_running == 0);

  if (!skip_lock)
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    mysql_mutex_unlock(term_lock);
749
  DBUG_RETURN(0);
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}

752

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int start_slave_thread(
#ifdef HAVE_PSI_INTERFACE
                       PSI_thread_key thread_key,
#endif
                       pthread_handler h_func, mysql_mutex_t *start_lock,
                       mysql_mutex_t *cond_lock,
                       mysql_cond_t *start_cond,
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                       volatile uint *slave_running,
                       volatile ulong *slave_run_id,
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                       Master_info* mi)
763 764
{
  pthread_t th;
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  ulong start_id;
  DBUG_ENTER("start_slave_thread");

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  DBUG_ASSERT(mi->inited);

770
  if (start_lock)
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    mysql_mutex_lock(start_lock);
772
  if (!global_system_variables.server_id)
773 774
  {
    if (start_cond)
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      mysql_cond_broadcast(start_cond);
776
    if (start_lock)
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      mysql_mutex_unlock(start_lock);
778
    sql_print_error("Server id not set, will not start slave");
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    DBUG_RETURN(ER_BAD_SLAVE);
780
  }
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782
  if (*slave_running)
783 784
  {
    if (start_cond)
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785
      mysql_cond_broadcast(start_cond);
786
    if (start_lock)
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787
      mysql_mutex_unlock(start_lock);
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788
    DBUG_RETURN(ER_SLAVE_MUST_STOP);
789
  }
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  start_id= *slave_run_id;
  DBUG_PRINT("info",("Creating new slave thread"));
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  if (mysql_thread_create(thread_key,
                          &th, &connection_attrib, h_func, (void*)mi))
794 795
  {
    if (start_lock)
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      mysql_mutex_unlock(start_lock);
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    DBUG_RETURN(ER_SLAVE_THREAD);
798
  }
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  if (start_cond && cond_lock) // caller has cond_lock
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  {
    THD* thd = current_thd;
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    while (start_id == *slave_run_id)
803
    {
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      DBUG_PRINT("sleep",("Waiting for slave thread to start"));
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      const char *old_msg= thd->enter_cond(start_cond, cond_lock,
                                           "Waiting for slave thread to start");
      /*
        It is not sufficient to test this at loop bottom. We must test
        it after registering the mutex in enter_cond(). If the kill
        happens after testing of thd->killed and before the mutex is
        registered, we could otherwise go waiting though thd->killed is
        set.
      */
      if (!thd->killed)
        mysql_cond_wait(start_cond, cond_lock);
816
      thd->exit_cond(old_msg);
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      mysql_mutex_lock(cond_lock); // re-acquire it as exit_cond() released
818
      if (thd->killed)
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      {
        if (start_lock)
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821
          mysql_mutex_unlock(start_lock);
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        DBUG_RETURN(thd->killed_errno());
823
      }
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    }
  }
  if (start_lock)
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827
    mysql_mutex_unlock(start_lock);
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  DBUG_RETURN(0);
829
}
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831

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/*
833
  start_slave_threads()
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834

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  NOTES
    SLAVE_FORCE_ALL is not implemented here on purpose since it does not make
    sense to do that for starting a slave--we always care if it actually
    started the threads that were not previously running
839
*/
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840

841
int start_slave_threads(bool need_slave_mutex, bool wait_for_start,
842
                        Master_info* mi, const char* master_info_fname,
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                        const char* slave_info_fname, int thread_mask)
844
{
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845 846
  mysql_mutex_t *lock_io=0, *lock_sql=0, *lock_cond_io=0, *lock_cond_sql=0;
  mysql_cond_t* cond_io=0, *cond_sql=0;
847
  int error=0;
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  const char *errmsg;
849
  DBUG_ENTER("start_slave_threads");
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851 852 853 854 855 856 857 858 859 860 861 862
  if (need_slave_mutex)
  {
    lock_io = &mi->run_lock;
    lock_sql = &mi->rli.run_lock;
  }
  if (wait_for_start)
  {
    cond_io = &mi->start_cond;
    cond_sql = &mi->rli.start_cond;
    lock_cond_io = &mi->run_lock;
    lock_cond_sql = &mi->rli.run_lock;
  }
863

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864 865 866 867 868 869 870 871 872
  /*
    If we are using GTID and both SQL and IO threads are stopped, then get
    rid of all relay logs.

    Relay logs are not very useful when using GTID, except as a buffer
    between the fetch in the IO thread and the apply in SQL thread. However
    while one of the threads is running, they are in use and cannot be
    removed.
  */
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  if (mi->using_gtid != Master_info::USE_GTID_NO &&
      !mi->slave_running && !mi->rli.slave_running)
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  {
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    /*
      purge_relay_logs() clears the mi->rli.group_master_log_pos.
      So save and restore them, like we do in CHANGE MASTER.
      (We are not going to use them for GTID, but it might be worth to
      keep them in case connection with GTID fails and user wants to go
      back and continue with previous old-style replication coordinates).
    */
    mi->master_log_pos = max(BIN_LOG_HEADER_SIZE, mi->rli.group_master_log_pos);
    strmake(mi->master_log_name, mi->rli.group_master_log_name,
            sizeof(mi->master_log_name)-1);
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    purge_relay_logs(&mi->rli, NULL, 0, &errmsg);
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    mi->rli.group_master_log_pos= mi->master_log_pos;
    strmake(mi->rli.group_master_log_name, mi->master_log_name,
            sizeof(mi->rli.group_master_log_name)-1);

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    error= rpl_load_gtid_state(&mi->gtid_current_pos, mi->using_gtid ==
                                             Master_info::USE_GTID_CURRENT_POS);
    mi->events_queued_since_last_gtid= 0;
    mi->gtid_reconnect_event_skip_count= 0;
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  }

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897
  if (!error && (thread_mask & SLAVE_IO))
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    error= start_slave_thread(
#ifdef HAVE_PSI_INTERFACE
                              key_thread_slave_io,
#endif
                              handle_slave_io, lock_io, lock_cond_io,
                              cond_io,
                              &mi->slave_running, &mi->slave_run_id,
                              mi);
906
  if (!error && (thread_mask & SLAVE_SQL))
907
  {
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    error= start_slave_thread(
#ifdef HAVE_PSI_INTERFACE
                              key_thread_slave_sql,
#endif
                              handle_slave_sql, lock_sql, lock_cond_sql,
                              cond_sql,
                              &mi->rli.slave_running, &mi->rli.slave_run_id,
                              mi);
916
    if (error)
917
      terminate_slave_threads(mi, thread_mask & SLAVE_IO, !need_slave_mutex);
918
  }
919
  DBUG_RETURN(error);
920
}
921

922

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923
/*
924
  Release slave threads at time of executing shutdown.
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  SYNOPSIS
    end_slave()
*/
929

930 931
void end_slave()
{
932 933
  DBUG_ENTER("end_slave");

934 935 936 937 938 939
  /*
    This is called when the server terminates, in close_connections().
    It terminates slave threads. However, some CHANGE MASTER etc may still be
    running presently. If a START SLAVE was in progress, the mutex lock below
    will make us wait until slave threads have started, and START SLAVE
    returns, then we terminate them here.
940 941 942

    We can also be called by cleanup(), which only happens if some
    startup parameter to the server was wrong.
943
  */
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944
  mysql_mutex_lock(&LOCK_active_mi);
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  /* This will call terminate_slave_threads() on all connections */
  delete master_info_index;
  master_info_index= 0;
  active_mi= 0;
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949
  mysql_mutex_unlock(&LOCK_active_mi);
950
  free_all_rpl_filters();
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  DBUG_VOID_RETURN;
}

954
static bool io_slave_killed(THD* thd, Master_info* mi)
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{
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  DBUG_ENTER("io_slave_killed");

958
  DBUG_ASSERT(mi->io_thd == thd);
959
  DBUG_ASSERT(mi->slave_running); // tracking buffer overrun
960
  DBUG_RETURN(mi->abort_slave || abort_loop || thd->killed);
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}

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/**
   The function analyzes a possible killed status and makes
   a decision whether to accept it or not.
   Normally upon accepting the sql thread goes to shutdown.
   In the event of deffering decision @rli->last_event_start_time waiting
   timer is set to force the killed status be accepted upon its expiration.
969

970 971
   @param thd   pointer to a THD instance
   @param rli   pointer to Relay_log_info instance
972

973 974 975
   @return TRUE the killed status is recognized, FALSE a possible killed
           status is deferred.
*/
976
static bool sql_slave_killed(THD* thd, Relay_log_info* rli)
977
{
978
  bool ret= FALSE;
979 980
  DBUG_ENTER("sql_slave_killed");

981 982
  DBUG_ASSERT(rli->sql_thd == thd);
  DBUG_ASSERT(rli->slave_running == 1);// tracking buffer overrun
983 984
  if (abort_loop || thd->killed || rli->abort_slave)
  {
985 986 987 988 989 990 991 992
    /*
      The transaction should always be binlogged if OPTION_KEEP_LOG is set
      (it implies that something can not be rolled back). And such case
      should be regarded similarly as modifing a non-transactional table
      because retrying of the transaction will lead to an error or inconsistency
      as well.
      Example: OPTION_KEEP_LOG is set if a temporary table is created or dropped.
    */
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    if ((thd->transaction.all.modified_non_trans_table ||
         (thd->variables.option_bits & OPTION_KEEP_LOG))
        && rli->is_in_group())
996
    {
997
      char msg_stopped[]=
998 999 1000 1001
        "... Slave SQL Thread stopped with incomplete event group "
        "having non-transactional changes. "
        "If the group consists solely of row-based events, you can try "
        "to restart the slave with --slave-exec-mode=IDEMPOTENT, which "
1002 1003 1004 1005 1006
        "ignores duplicate key, key not found, and similar errors (see "
        "documentation for details).";

      if (rli->abort_slave)
      {
1007 1008 1009
        DBUG_PRINT("info", ("Request to stop slave SQL Thread received while "
                            "applying a group that has non-transactional "
                            "changes; waiting for completion of the group ... "));
1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032

        /*
          Slave sql thread shutdown in face of unfinished group modified 
          Non-trans table is handled via a timer. The slave may eventually
          give out to complete the current group and in that case there
          might be issues at consequent slave restart, see the error message.
          WL#2975 offers a robust solution requiring to store the last exectuted
          event's coordinates along with the group's coordianates
          instead of waiting with @c last_event_start_time the timer.
        */

        if (rli->last_event_start_time == 0)
          rli->last_event_start_time= my_time(0);
        ret= difftime(my_time(0), rli->last_event_start_time) <=
          SLAVE_WAIT_GROUP_DONE ? FALSE : TRUE;

        DBUG_EXECUTE_IF("stop_slave_middle_group", 
                        DBUG_EXECUTE_IF("incomplete_group_in_relay_log",
                                        ret= TRUE;);); // time is over

        if (ret == 0)
        {
          rli->report(WARNING_LEVEL, 0,
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                      "Request to stop slave SQL Thread received while "
                      "applying a group that has non-transactional "
                      "changes; waiting for completion of the group ... ");
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        }
        else
        {
          rli->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR,
                      ER(ER_SLAVE_FATAL_ERROR), msg_stopped);
        }
      }
      else
      {
        ret= TRUE;
        rli->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, ER(ER_SLAVE_FATAL_ERROR),
                    msg_stopped);
      }
    }
    else
    {
      ret= TRUE;
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    }
  }
1055 1056 1057 1058
  if (ret)
    rli->last_event_start_time= 0;
  
  DBUG_RETURN(ret);
1059 1060
}

1061

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/*
1063 1064
  skip_load_data_infile()

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  NOTES
    This is used to tell a 3.23 master to break send_file()
*/
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void skip_load_data_infile(NET *net)
{
1071 1072
  DBUG_ENTER("skip_load_data_infile");

1073
  (void)net_request_file(net, "/dev/null");
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  (void)my_net_read(net);                               // discard response
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  (void)net_write_command(net, 0, (uchar*) "", 0, (uchar*) "", 0); // ok
1076
  DBUG_VOID_RETURN;
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}

1079

1080
bool net_request_file(NET* net, const char* fname)
1081
{
1082
  DBUG_ENTER("net_request_file");
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  DBUG_RETURN(net_write_command(net, 251, (uchar*) fname, strlen(fname),
                                (uchar*) "", 0));
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}

1087 1088
/*
  From other comments and tests in code, it looks like
1089
  sometimes Query_log_event and Load_log_event can have db == 0
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  (see rewrite_db() above for example)
  (cases where this happens are unclear; it may be when the master is 3.23).
*/
1093 1094

const char *print_slave_db_safe(const char* db)
1095
{
1096 1097 1098
  DBUG_ENTER("*print_slave_db_safe");

  DBUG_RETURN((db ? db : ""));
1099
}
1100

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#endif /* HAVE_REPLICATION */

1103
int init_strvar_from_file(char *var, int max_size, IO_CACHE *f,
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                                 const char *default_val)
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{
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  uint length;
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  DBUG_ENTER("init_strvar_from_file");

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  if ((length=my_b_gets(f,var, max_size)))
  {
    char* last_p = var + length -1;
    if (*last_p == '\n')
      *last_p = 0; // if we stopped on newline, kill it
    else
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    {
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      /*
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        If we truncated a line or stopped on last char, remove all chars
        up to and including newline.
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      */
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      int c;
1121
      while (((c=my_b_get(f)) != '\n' && c != my_b_EOF)) ;
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    }
1123
    DBUG_RETURN(0);
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  }
  else if (default_val)
  {
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    strmake(var,  default_val, max_size-1);
1128
    DBUG_RETURN(0);
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  }
1130
  DBUG_RETURN(1);
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}

1133

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/*
  when moving these functions to mysys, don't forget to
  remove slave.cc from libmysqld/CMakeLists.txt
*/
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int init_intvar_from_file(int* var, IO_CACHE* f, int default_val)
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{
  char buf[32];
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  DBUG_ENTER("init_intvar_from_file");

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  if (my_b_gets(f, buf, sizeof(buf)))
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  {
    *var = atoi(buf);
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    DBUG_RETURN(0);
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  }
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  else if (default_val)
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  {
    *var = default_val;
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    DBUG_RETURN(0);
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  }
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  DBUG_RETURN(1);
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}

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int init_floatvar_from_file(float* var, IO_CACHE* f, float default_val)
{
  char buf[16];
  DBUG_ENTER("init_floatvar_from_file");


  if (my_b_gets(f, buf, sizeof(buf)))
  {
    if (sscanf(buf, "%f", var) != 1)
      DBUG_RETURN(1);
    else
      DBUG_RETURN(0);
  }
  else if (default_val != 0.0)
  {
    *var = default_val;
    DBUG_RETURN(0);
  }
  DBUG_RETURN(1);
}

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/**
   A master info read method

   This function is called from @c init_master_info() along with
   relatives to restore some of @c active_mi members.
   Particularly, this function is responsible for restoring
   IGNORE_SERVER_IDS list of servers whose events the slave is
   going to ignore (to not log them in the relay log).
   Items being read are supposed to be decimal output of values of a
   type shorter or equal of @c long and separated by the single space.

   @param arr         @c DYNAMIC_ARRAY pointer to storage for servers id
   @param f           @c IO_CACHE pointer to the source file

   @retval 0         All OK
   @retval non-zero  An error
*/

int init_dynarray_intvar_from_file(DYNAMIC_ARRAY* arr, IO_CACHE* f)
{
  int ret= 0;
  char buf[16 * (sizeof(long)*4 + 1)]; // static buffer to use most of times
  char *buf_act= buf; // actual buffer can be dynamic if static is short
  char *token, *last;
  uint num_items;     // number of items of `arr'
  size_t read_size;
  DBUG_ENTER("init_dynarray_intvar_from_file");

  if ((read_size= my_b_gets(f, buf_act, sizeof(buf))) == 0)
  {
    return 0; // no line in master.info
  }
  if (read_size + 1 == sizeof(buf) && buf[sizeof(buf) - 2] != '\n')
  {
    /*
      short read happend; allocate sufficient memory and make the 2nd read
    */
    char buf_work[(sizeof(long)*3 + 1)*16];
    memcpy(buf_work, buf, sizeof(buf_work));
    num_items= atoi(strtok_r(buf_work, " ", &last));
    size_t snd_size;
    /*
      max size lower bound approximate estimation bases on the formula:
      (the items number + items themselves) * 
          (decimal size + space) - 1 + `\n' + '\0'
    */
    size_t max_size= (1 + num_items) * (sizeof(long)*3 + 1) + 1;
    buf_act= (char*) my_malloc(max_size, MYF(MY_WME));
    memcpy(buf_act, buf, read_size);
    snd_size= my_b_gets(f, buf_act + read_size, max_size - read_size);
    if (snd_size == 0 ||
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        ((snd_size + 1 == max_size - read_size) &&  buf_act[max_size - 2] != '\n'))
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    {
      /*
        failure to make the 2nd read or short read again
      */
      ret= 1;
      goto err;
    }
  }
  token= strtok_r(buf_act, " ", &last);
  if (token == NULL)
  {
    ret= 1;
    goto err;
  }
  num_items= atoi(token);
  for (uint i=0; i < num_items; i++)
  {
    token= strtok_r(NULL, " ", &last);
    if (token == NULL)
    {
      ret= 1;
      goto err;
    }
    else
    {
      ulong val= atol(token);
      insert_dynamic(arr, (uchar *) &val);
    }
  }
err:
  if (buf_act != buf)
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    my_free(buf_act);
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  DBUG_RETURN(ret);
}

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#ifdef HAVE_REPLICATION

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/*
  Check if the error is caused by network.
  @param[in]   errorno   Number of the error.
  RETURNS:
  TRUE         network error
  FALSE        not network error
*/

bool is_network_error(uint errorno)
{ 
  if (errorno == CR_CONNECTION_ERROR || 
      errorno == CR_CONN_HOST_ERROR ||
      errorno == CR_SERVER_GONE_ERROR ||
      errorno == CR_SERVER_LOST ||
      errorno == ER_CON_COUNT_ERROR ||
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      errorno == ER_CONNECTION_KILLED ||
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      errorno == ER_NEW_ABORTING_CONNECTION ||
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      errorno == ER_SERVER_SHUTDOWN)
    return TRUE;

  return FALSE;   
}


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/*
  Note that we rely on the master's version (3.23, 4.0.14 etc) instead of
  relying on the binlog's version. This is not perfect: imagine an upgrade
  of the master without waiting that all slaves are in sync with the master;
  then a slave could be fooled about the binlog's format. This is what happens
  when people upgrade a 3.23 master to 4.0 without doing RESET MASTER: 4.0
  slaves are fooled. So we do this only to distinguish between 3.23 and more
  recent masters (it's too late to change things for 3.23).
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  RETURNS
  0       ok
  1       error
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  2       transient network problem, the caller should try to reconnect
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*/
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static int get_master_version_and_clock(MYSQL* mysql, Master_info* mi)
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{
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  char err_buff[MAX_SLAVE_ERRMSG], err_buff2[MAX_SLAVE_ERRMSG];
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  const char* errmsg= 0;
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  int err_code= 0;
  MYSQL_RES *master_res= 0;
  MYSQL_ROW master_row;
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  uint version= mysql_get_server_version(mysql) / 10000;
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  DBUG_ENTER("get_master_version_and_clock");
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  /*
    Free old description_event_for_queue (that is needed if we are in
    a reconnection).
  */
  delete mi->rli.relay_log.description_event_for_queue;
  mi->rli.relay_log.description_event_for_queue= 0;
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  if (!my_isdigit(&my_charset_bin,*mysql->server_version))
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  {
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    errmsg= err_buff2;
    snprintf(err_buff2, sizeof(err_buff2),
             "Master reported unrecognized MySQL version: %s",
             mysql->server_version);
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    err_code= ER_SLAVE_FATAL_ERROR;
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    sprintf(err_buff, ER(err_code), err_buff2);
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  }
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  else
  {
    /*
      Note the following switch will bug when we have MySQL branch 30 ;)
    */
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    switch (version) {
    case 0:
    case 1:
    case 2:
      errmsg= err_buff2;
      snprintf(err_buff2, sizeof(err_buff2),
               "Master reported unrecognized MySQL version: %s",
               mysql->server_version);
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      err_code= ER_SLAVE_FATAL_ERROR;
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      sprintf(err_buff, ER(err_code), err_buff2);
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      break;
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    case 3:
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      mi->rli.relay_log.description_event_for_queue= new
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        Format_description_log_event(1, mysql->server_version);
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      break;
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    case 4:
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      mi->rli.relay_log.description_event_for_queue= new
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        Format_description_log_event(3, mysql->server_version);
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      break;
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    default:
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      /*
        Master is MySQL >=5.0. Give a default Format_desc event, so that we can
        take the early steps (like tests for "is this a 3.23 master") which we
        have to take before we receive the real master's Format_desc which will
        override this one. Note that the Format_desc we create below is garbage
        (it has the format of the *slave*); it's only good to help know if the
        master is 3.23, 4.0, etc.
      */
      mi->rli.relay_log.description_event_for_queue= new
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        Format_description_log_event(4, mysql->server_version);
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      break;
    }
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  }
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  /*
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     This does not mean that a 5.0 slave will be able to read a 6.0 master; but
     as we don't know yet, we don't want to forbid this for now. If a 5.0 slave
     can't read a 6.0 master, this will show up when the slave can't read some
     events sent by the master, and there will be error messages.
  */
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  if (errmsg)
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    goto err;
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  /* as we are here, we tried to allocate the event */
  if (!mi->rli.relay_log.description_event_for_queue)
  {
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    errmsg= "default Format_description_log_event";
    err_code= ER_SLAVE_CREATE_EVENT_FAILURE;
    sprintf(err_buff, ER(err_code), errmsg);
    goto err;
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  }

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  /*
    FD_q's (A) is set initially from RL's (A): FD_q.(A) := RL.(A).
    It's necessary to adjust FD_q.(A) at this point because in the following
    course FD_q is going to be dumped to RL.
    Generally FD_q is derived from a received FD_m (roughly FD_q := FD_m) 
    in queue_event and the master's (A) is installed.
    At one step with the assignment the Relay-Log's checksum alg is set to 
    a new value: RL.(A) := FD_q.(A). If the slave service is stopped
    the last time assigned RL.(A) will be passed over to the restarting
    service (to the current execution point).
    RL.A is a "codec" to verify checksum in queue_event() almost all the time
    the first fake Rotate event.
    Starting from this point IO thread will executes the following checksum
    warmup sequence  of actions:

    FD_q.A := RL.A,
    A_m^0 := master.@@global.binlog_checksum,
    {queue_event(R_f): verifies(R_f, A_m^0)},
    {queue_event(FD_m): verifies(FD_m, FD_m.A), dump(FD_q), rotate(RL),
                        FD_q := FD_m, RL.A := FD_q.A)}

    See legends definition on MYSQL_BIN_LOG::relay_log_checksum_alg
    docs lines (binlog.h).
    In above A_m^0 - the value of master's
    @@binlog_checksum determined in the upcoming handshake (stored in
    mi->checksum_alg_before_fd).


    After the warm-up sequence IO gets to "normal" checksum verification mode
    to use RL.A in 
    
    {queue_event(E_m): verifies(E_m, RL.A)}

    until it has received a new FD_m.
  */
  mi->rli.relay_log.description_event_for_queue->checksum_alg=
    mi->rli.relay_log.relay_log_checksum_alg;

  DBUG_ASSERT(mi->rli.relay_log.description_event_for_queue->checksum_alg !=
              BINLOG_CHECKSUM_ALG_UNDEF);
  DBUG_ASSERT(mi->rli.relay_log.relay_log_checksum_alg !=
              BINLOG_CHECKSUM_ALG_UNDEF); 
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  /*
    Compare the master and slave's clock. Do not die if master's clock is
    unavailable (very old master not supporting UNIX_TIMESTAMP()?).
  */
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#ifdef ENABLED_DEBUG_SYNC
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  DBUG_EXECUTE_IF("dbug.before_get_UNIX_TIMESTAMP",
                  {
                    const char act[]=
                      "now "
                      "wait_for signal.get_unix_timestamp";
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                    DBUG_ASSERT(debug_sync_service);
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                    DBUG_ASSERT(!debug_sync_set_action(current_thd,
                                                       STRING_WITH_LEN(act)));
                  };);
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#endif
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  master_res= NULL;
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  if (!mysql_real_query(mysql, STRING_WITH_LEN("SELECT UNIX_TIMESTAMP()")) &&
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      (master_res= mysql_store_result(mysql)) &&
      (master_row= mysql_fetch_row(master_res)))
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  {
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    mi->clock_diff_with_master=
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      (long) (time((time_t*) 0) - strtoul(master_row[0], 0, 10));
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  }
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  else if (check_io_slave_killed(mi->io_thd, mi, NULL))
    goto slave_killed_err;
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  else if (is_network_error(mysql_errno(mysql)))
  {
    mi->report(WARNING_LEVEL, mysql_errno(mysql),
               "Get master clock failed with error: %s", mysql_error(mysql));
    goto network_err;
  }
  else 
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  {
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    mi->clock_diff_with_master= 0; /* The "most sensible" value */
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    sql_print_warning("\"SELECT UNIX_TIMESTAMP()\" failed on master, "
                      "do not trust column Seconds_Behind_Master of SHOW "
                      "SLAVE STATUS. Error: %s (%d)",
                      mysql_error(mysql), mysql_errno(mysql));
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  }
  if (master_res)
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  {
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    mysql_free_result(master_res);
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    master_res= NULL;
  }
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  /*
    Check that the master's server id and ours are different. Because if they
    are equal (which can result from a simple copy of master's datadir to slave,
    thus copying some my.cnf), replication will work but all events will be
    skipped.
    Do not die if SHOW VARIABLES LIKE 'SERVER_ID' fails on master (very old
    master?).
    Note: we could have put a @@SERVER_ID in the previous SELECT
    UNIX_TIMESTAMP() instead, but this would not have worked on 3.23 masters.
  */
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#ifdef ENABLED_DEBUG_SYNC
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  DBUG_EXECUTE_IF("dbug.before_get_SERVER_ID",
                  {
                    const char act[]=
                      "now "
                      "wait_for signal.get_server_id";
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                    DBUG_ASSERT(debug_sync_service);
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                    DBUG_ASSERT(!debug_sync_set_action(current_thd, 
                                                       STRING_WITH_LEN(act)));
                  };);
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#endif
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  master_res= NULL;
  master_row= NULL;
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  if (!mysql_real_query(mysql,
                        STRING_WITH_LEN("SHOW VARIABLES LIKE 'SERVER_ID'")) &&
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      (master_res= mysql_store_result(mysql)) &&
      (master_row= mysql_fetch_row(master_res)))
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  {
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    if ((global_system_variables.server_id ==
             (mi->master_id= strtoul(master_row[1], 0, 10))) &&
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        !mi->rli.replicate_same_server_id)
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    {
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      errmsg= "The slave I/O thread stops because master and slave have equal \
MySQL server ids; these ids must be different for replication to work (or \
the --replicate-same-server-id option must be used on slave but this does \
not always make sense; please check the manual before using it).";
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      err_code= ER_SLAVE_FATAL_ERROR;
      sprintf(err_buff, ER(err_code), errmsg);
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      goto err;
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    }
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  }
  else if (mysql_errno(mysql))
  {
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    if (check_io_slave_killed(mi->io_thd, mi, NULL))
      goto slave_killed_err;
    else if (is_network_error(mysql_errno(mysql)))
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    {
      mi->report(WARNING_LEVEL, mysql_errno(mysql),
                 "Get master SERVER_ID failed with error: %s", mysql_error(mysql));
      goto network_err;
    }
    /* Fatal error */
    errmsg= "The slave I/O thread stops because a fatal error is encountered \
when it try to get the value of SERVER_ID variable from master.";
    err_code= mysql_errno(mysql);
    sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
    goto err;
  }
  else if (!master_row && master_res)
  {
    mi->report(WARNING_LEVEL, ER_UNKNOWN_SYSTEM_VARIABLE,
               "Unknown system variable 'SERVER_ID' on master, \
maybe it is a *VERY OLD MASTER*.");
  }
  if (master_res)
  {
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    mysql_free_result(master_res);
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    master_res= NULL;
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  }
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  if (mi->master_id == 0 && mi->ignore_server_ids.elements > 0)
  {
    errmsg= "Slave configured with server id filtering could not detect the master server id.";
    err_code= ER_SLAVE_FATAL_ERROR;
    sprintf(err_buff, ER(err_code), errmsg);
    goto err;
  }
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  /*
    Check that the master's global character_set_server and ours are the same.
    Not fatal if query fails (old master?).
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    Note that we don't check for equality of global character_set_client and
    collation_connection (neither do we prevent their setting in
    set_var.cc). That's because from what I (Guilhem) have tested, the global
    values of these 2 are never used (new connections don't use them).
    We don't test equality of global collation_database either as it's is
    going to be deprecated (made read-only) in 4.1 very soon.
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    The test is only relevant if master < 5.0.3 (we'll test only if it's older
    than the 5 branch; < 5.0.3 was alpha...), as >= 5.0.3 master stores
    charset info in each binlog event.
    We don't do it for 3.23 because masters <3.23.50 hang on
    SELECT @@unknown_var (BUG#7965 - see changelog of 3.23.50). So finally we
    test only if master is 4.x.
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  */
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  /* redundant with rest of code but safer against later additions */
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  if (version == 3)
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    goto err;
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  if (version == 4)
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  {
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    master_res= NULL;
    if (!mysql_real_query(mysql,
                          STRING_WITH_LEN("SELECT @@GLOBAL.COLLATION_SERVER")) &&
        (master_res= mysql_store_result(mysql)) &&
        (master_row= mysql_fetch_row(master_res)))
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    {
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      if (strcmp(master_row[0], global_system_variables.collation_server->name))
      {
        errmsg= "The slave I/O thread stops because master and slave have \
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different values for the COLLATION_SERVER global variable. The values must \
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be equal for the Statement-format replication to work";
        err_code= ER_SLAVE_FATAL_ERROR;
        sprintf(err_buff, ER(err_code), errmsg);
        goto err;
      }
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    }
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    else if (check_io_slave_killed(mi->io_thd, mi, NULL))
      goto slave_killed_err;
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    else if (is_network_error(mysql_errno(mysql)))
    {
      mi->report(WARNING_LEVEL, mysql_errno(mysql),
                 "Get master COLLATION_SERVER failed with error: %s", mysql_error(mysql));
      goto network_err;
    }
    else if (mysql_errno(mysql) != ER_UNKNOWN_SYSTEM_VARIABLE)
    {
      /* Fatal error */
      errmsg= "The slave I/O thread stops because a fatal error is encountered \
when it try to get the value of COLLATION_SERVER global variable from master.";
      err_code= mysql_errno(mysql);
      sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
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      goto err;
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    }
    else
      mi->report(WARNING_LEVEL, ER_UNKNOWN_SYSTEM_VARIABLE,
                 "Unknown system variable 'COLLATION_SERVER' on master, \
maybe it is a *VERY OLD MASTER*. *NOTE*: slave may experience \
inconsistency if replicated data deals with collation.");

    if (master_res)
    {
      mysql_free_result(master_res);
      master_res= NULL;
    }
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  }
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  /*
    Perform analogous check for time zone. Theoretically we also should
    perform check here to verify that SYSTEM time zones are the same on
    slave and master, but we can't rely on value of @@system_time_zone
    variable (it is time zone abbreviation) since it determined at start
    time and so could differ for slave and master even if they are really
    in the same system time zone. So we are omiting this check and just
    relying on documentation. Also according to Monty there are many users
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    who are using replication between servers in various time zones. Hence
    such check will broke everything for them. (And now everything will
    work for them because by default both their master and slave will have
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    'SYSTEM' time zone).
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    This check is only necessary for 4.x masters (and < 5.0.4 masters but
    those were alpha).
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  */
1641
  if (version == 4)
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  {
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    master_res= NULL;
    if (!mysql_real_query(mysql, STRING_WITH_LEN("SELECT @@GLOBAL.TIME_ZONE")) &&
        (master_res= mysql_store_result(mysql)) &&
        (master_row= mysql_fetch_row(master_res)))
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    {
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      if (strcmp(master_row[0],
                 global_system_variables.time_zone->get_name()->ptr()))
      {
        errmsg= "The slave I/O thread stops because master and slave have \
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different values for the TIME_ZONE global variable. The values must \
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be equal for the Statement-format replication to work";
        err_code= ER_SLAVE_FATAL_ERROR;
        sprintf(err_buff, ER(err_code), errmsg);
        goto err;
      }
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    }
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    else if (check_io_slave_killed(mi->io_thd, mi, NULL))
      goto slave_killed_err;
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    else if (is_network_error(err_code= mysql_errno(mysql)))
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    {
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      mi->report(ERROR_LEVEL, err_code,
                 "Get master TIME_ZONE failed with error: %s",
                 mysql_error(mysql));
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      goto network_err;
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    }
    else if (err_code == ER_UNKNOWN_SYSTEM_VARIABLE)
    {
      /* We use ERROR_LEVEL to get the error logged to file */
      mi->report(ERROR_LEVEL, err_code,

                 "MySQL master doesn't have a TIME_ZONE variable. Note that"
                 "if your timezone is not same between master and slave, your "
                 "slave may get wrong data into timestamp columns");
    }
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    else
    {
      /* Fatal error */
      errmsg= "The slave I/O thread stops because a fatal error is encountered \
when it try to get the value of TIME_ZONE global variable from master.";
      sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
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      goto err;
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    }
    if (master_res)
    {
      mysql_free_result(master_res);
      master_res= NULL;
    }
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  }

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  if (mi->heartbeat_period != 0.0)
  {
    char llbuf[22];
    const char query_format[]= "SET @master_heartbeat_period= %s";
    char query[sizeof(query_format) - 2 + sizeof(llbuf)];
    /* 
       the period is an ulonglong of nano-secs. 
    */
    llstr((ulonglong) (mi->heartbeat_period*1000000000UL), llbuf);
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    sprintf(query, query_format, llbuf);
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    if (mysql_real_query(mysql, query, strlen(query))
        && !check_io_slave_killed(mi->io_thd, mi, NULL))
    {
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      errmsg= "The slave I/O thread stops because SET @master_heartbeat_period "
        "on master failed.";
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      err_code= ER_SLAVE_FATAL_ERROR;
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      sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
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      mysql_free_result(mysql_store_result(mysql));
      goto err;
    }
    mysql_free_result(mysql_store_result(mysql));
  }
 
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  /*
    Querying if master is capable to checksum and notifying it about own
    CRC-awareness. The master's side instant value of @@global.binlog_checksum 
    is stored in the dump thread's uservar area as well as cached locally
    to become known in consensus by master and slave.
  */
  DBUG_EXECUTE_IF("simulate_slave_unaware_checksum",
                  mi->checksum_alg_before_fd= BINLOG_CHECKSUM_ALG_OFF;
                  goto past_checksum;);
  {
    int rc;
    const char query[]= "SET @master_binlog_checksum= @@global.binlog_checksum";
    master_res= NULL;
    mi->checksum_alg_before_fd= BINLOG_CHECKSUM_ALG_UNDEF; //initially undefined
    /*
      @c checksum_alg_before_fd is queried from master in this block.
      If master is old checksum-unaware the value stays undefined.
      Once the first FD will be received its alg descriptor will replace
      the being queried one.
    */
    rc= mysql_real_query(mysql, query, strlen(query));
    if (rc != 0)
    {
      if (check_io_slave_killed(mi->io_thd, mi, NULL))
        goto slave_killed_err;

      if (mysql_errno(mysql) == ER_UNKNOWN_SYSTEM_VARIABLE)
      {
        // this is tolerable as OM -> NS is supported
        mi->report(WARNING_LEVEL, mysql_errno(mysql),
                   "Notifying master by %s failed with "
                   "error: %s", query, mysql_error(mysql));
      }
      else
      {
        if (is_network_error(mysql_errno(mysql)))
        {
          mi->report(WARNING_LEVEL, mysql_errno(mysql),
                     "Notifying master by %s failed with "
                     "error: %s", query, mysql_error(mysql));
          mysql_free_result(mysql_store_result(mysql));
          goto network_err;
        }
        else
        {
          errmsg= "The slave I/O thread stops because a fatal error is encountered "
            "when it tried to SET @master_binlog_checksum on master.";
          err_code= ER_SLAVE_FATAL_ERROR;
          sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
          mysql_free_result(mysql_store_result(mysql));
          goto err;
        }
      }
    }
    else
    {
      mysql_free_result(mysql_store_result(mysql));
      if (!mysql_real_query(mysql,
                            STRING_WITH_LEN("SELECT @master_binlog_checksum")) &&
          (master_res= mysql_store_result(mysql)) &&
          (master_row= mysql_fetch_row(master_res)) &&
          (master_row[0] != NULL))
      {
        mi->checksum_alg_before_fd= (uint8)
          find_type(master_row[0], &binlog_checksum_typelib, 1) - 1;
        // valid outcome is either of
        DBUG_ASSERT(mi->checksum_alg_before_fd == BINLOG_CHECKSUM_ALG_OFF ||
                    mi->checksum_alg_before_fd == BINLOG_CHECKSUM_ALG_CRC32);
      }
      else if (check_io_slave_killed(mi->io_thd, mi, NULL))
        goto slave_killed_err;
      else if (is_network_error(mysql_errno(mysql)))
      {
        mi->report(WARNING_LEVEL, mysql_errno(mysql),
                   "Get master BINLOG_CHECKSUM failed with error: %s", mysql_error(mysql));
        goto network_err;
      }
      else
      {
        errmsg= "The slave I/O thread stops because a fatal error is encountered "
          "when it tried to SELECT @master_binlog_checksum.";
        err_code= ER_SLAVE_FATAL_ERROR;
        sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
        mysql_free_result(mysql_store_result(mysql));
        goto err;
      }
    }
    if (master_res)
    {
      mysql_free_result(master_res);
      master_res= NULL;
    }
  }

#ifndef DBUG_OFF
past_checksum:
#endif
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1814
  /*
1815
    Request the master to filter away events with the @@skip_replication flag
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    set, if we are running with
    --replicate-events-marked-for-skip=FILTER_ON_MASTER.
1818
  */
1819
  if (opt_replicate_events_marked_for_skip == RPL_SKIP_FILTER_ON_MASTER)
1820
  {
1821
    if (mysql_real_query(mysql, STRING_WITH_LEN("SET skip_replication=1")))
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    {
      err_code= mysql_errno(mysql);
      if (is_network_error(err_code))
      {
        mi->report(ERROR_LEVEL, err_code,
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                   "Setting master-side filtering of @@skip_replication failed "
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                   "with error: %s", mysql_error(mysql));
        goto network_err;
      }
      else if (err_code == ER_UNKNOWN_SYSTEM_VARIABLE)
      {
        /*
          The master is older than the slave and does not support the
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          @@skip_replication feature.
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          This is not a problem, as such master will not generate events with
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          the @@skip_replication flag set in the first place. We will still
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          do slave-side filtering of such events though, to handle the (rare)
          case of downgrading a master and receiving old events generated from
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          before the downgrade with the @@skip_replication flag set.
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        */
        DBUG_PRINT("info", ("Old master does not support master-side filtering "
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                            "of @@skip_replication events."));
      }
      else
      {
        /* Fatal error */
        errmsg= "The slave I/O thread stops because a fatal error is "
          "encountered when it tries to request filtering of events marked "
          "with the @@skip_replication flag.";
        sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
        goto err;
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      }
    }
  }
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  /* Announce MariaDB slave capabilities. */
  DBUG_EXECUTE_IF("simulate_slave_capability_none", goto after_set_capability;);
  {
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    int rc= DBUG_EVALUATE_IF("simulate_slave_capability_old_53",
        mysql_real_query(mysql, STRING_WITH_LEN("SET @mariadb_slave_capability="
                         STRINGIFY_ARG(MARIA_SLAVE_CAPABILITY_ANNOTATE))),
        mysql_real_query(mysql, STRING_WITH_LEN("SET @mariadb_slave_capability="
                         STRINGIFY_ARG(MARIA_SLAVE_CAPABILITY_MINE))));
    if (rc)
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    {
      err_code= mysql_errno(mysql);
      if (is_network_error(err_code))
      {
        mi->report(ERROR_LEVEL, err_code,
                   "Setting @mariadb_slave_capability failed with error: %s",
                   mysql_error(mysql));
        goto network_err;
      }
      else
      {
        /* Fatal error */
        errmsg= "The slave I/O thread stops because a fatal error is "
          "encountered when it tries to set @mariadb_slave_capability.";
        sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
        goto err;
      }
    }
  }
1885
#ifndef DBUG_OFF
1886
after_set_capability:
1887
#endif
1888

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  if (mi->using_gtid != Master_info::USE_GTID_NO)
1890
  {
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    /* Request dump to start from slave replication GTID state. */
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    int rc;
    char str_buf[256];
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    String query_str(str_buf, sizeof(str_buf), system_charset_info);
    query_str.length(0);
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    /*
      Read the master @@GLOBAL.gtid_domain_id variable.
      This is mostly to check that master is GTID aware, but we could later
      perhaps use it to check that different multi-source masters are correctly
      configured with distinct domain_id.
    */
    if (mysql_real_query(mysql,
                         STRING_WITH_LEN("SELECT @@GLOBAL.gtid_domain_id")) ||
        !(master_res= mysql_store_result(mysql)) ||
        !(master_row= mysql_fetch_row(master_res)))
    {
      err_code= mysql_errno(mysql);
      errmsg= "The slave I/O thread stops because master does not support "
        "MariaDB global transaction id. A fatal error is encountered when "
        "it tries to SELECT @@GLOBAL.gtid_domain_id.";
      sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
      goto err;
    }
    mysql_free_result(master_res);
    master_res= NULL;

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    query_str.append(STRING_WITH_LEN("SET @slave_connect_state='"),
                     system_charset_info);
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    if (mi->gtid_current_pos.append_to_string(&query_str))
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    {
      err_code= ER_OUTOFMEMORY;
      errmsg= "The slave I/O thread stops because a fatal out-of-memory "
        "error is encountered when it tries to compute @slave_connect_state.";
      sprintf(err_buff, "%s Error: Out of memory", errmsg);
      goto err;
    }
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    query_str.append(STRING_WITH_LEN("'"), system_charset_info);
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    rc= mysql_real_query(mysql, query_str.ptr(), query_str.length());
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    if (rc)
    {
      err_code= mysql_errno(mysql);
      if (is_network_error(err_code))
      {
        mi->report(ERROR_LEVEL, err_code,
                   "Setting @slave_connect_state failed with error: %s",
                   mysql_error(mysql));
        goto network_err;
      }
      else
      {
        /* Fatal error */
        errmsg= "The slave I/O thread stops because a fatal error is "
          "encountered when it tries to set @slave_connect_state.";
        sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
        goto err;
      }
    }
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    query_str.length(0);
    if (query_str.append(STRING_WITH_LEN("SET @slave_gtid_strict_mode="),
                         system_charset_info) ||
        query_str.append_ulonglong(opt_gtid_strict_mode != false))
    {
      err_code= ER_OUTOFMEMORY;
      errmsg= "The slave I/O thread stops because a fatal out-of-memory "
        "error is encountered when it tries to set @slave_gtid_strict_mode.";
      sprintf(err_buff, "%s Error: Out of memory", errmsg);
      goto err;
    }

    rc= mysql_real_query(mysql, query_str.ptr(), query_str.length());
    if (rc)
    {
      err_code= mysql_errno(mysql);
      if (is_network_error(err_code))
      {
        mi->report(ERROR_LEVEL, err_code,
                   "Setting @slave_gtid_strict_mode failed with error: %s",
                   mysql_error(mysql));
        goto network_err;
      }
      else
      {
        /* Fatal error */
        errmsg= "The slave I/O thread stops because a fatal error is "
          "encountered when it tries to set @slave_gtid_strict_mode.";
        sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
        goto err;
      }
    }

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    if (mi->rli.until_condition == Relay_log_info::UNTIL_GTID)
    {
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      query_str.length(0);
      query_str.append(STRING_WITH_LEN("SET @slave_until_gtid='"),
                       system_charset_info);
      if (mi->rli.until_gtid_pos.append_to_string(&query_str))
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      {
        err_code= ER_OUTOFMEMORY;
        errmsg= "The slave I/O thread stops because a fatal out-of-memory "
          "error is encountered when it tries to compute @slave_until_gtid.";
        sprintf(err_buff, "%s Error: Out of memory", errmsg);
        goto err;
      }
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      query_str.append(STRING_WITH_LEN("'"), system_charset_info);
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1999
      rc= mysql_real_query(mysql, query_str.ptr(), query_str.length());
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      if (rc)
      {
        err_code= mysql_errno(mysql);
        if (is_network_error(err_code))
        {
          mi->report(ERROR_LEVEL, err_code,
                     "Setting @slave_until_gtid failed with error: %s",
                     mysql_error(mysql));
          goto network_err;
        }
        else
        {
          /* Fatal error */
          errmsg= "The slave I/O thread stops because a fatal error is "
            "encountered when it tries to set @slave_until_gtid.";
          sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
          goto err;
        }
      }
    }
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  }
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  else
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  {
    /*
      If we are not using GTID to connect this time, then instead request
      the corresponding GTID position from the master, so that the user
      can reconnect the next time using MASTER_GTID_POS=AUTO.
    */
    char quote_buf[2*sizeof(mi->master_log_name)+1];
    char str_buf[28+2*sizeof(mi->master_log_name)+10];
    String query(str_buf, sizeof(str_buf), system_charset_info);
    query.length(0);

    query.append("SELECT binlog_gtid_pos('");
    escape_quotes_for_mysql(&my_charset_bin, quote_buf, sizeof(quote_buf),
                            mi->master_log_name, strlen(mi->master_log_name));
    query.append(quote_buf);
    query.append("',");
    query.append_ulonglong(mi->master_log_pos);
    query.append(")");

    if (!mysql_real_query(mysql, query.c_ptr_safe(), query.length()) &&
        (master_res= mysql_store_result(mysql)) &&
        (master_row= mysql_fetch_row(master_res)) &&
        (master_row[0] != NULL))
    {
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      rpl_global_gtid_slave_state.load(mi->io_thd, master_row[0],
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                                       strlen(master_row[0]), false, false);
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    }
    else if (check_io_slave_killed(mi->io_thd, mi, NULL))
      goto slave_killed_err;
    else if (is_network_error(mysql_errno(mysql)))
    {
      mi->report(WARNING_LEVEL, mysql_errno(mysql),
                 "Get master GTID position failed with error: %s", mysql_error(mysql));
      goto network_err;
    }
    else
    {
      /*
        ToDo: If the master does not have the binlog_gtid_pos() function, it
        just means that it is an old master with no GTID support, so we should
        do nothing.

        However, if binlog_gtid_pos() exists, but fails or returns NULL, then
        it means that the requested position is not valid. We could use this
        to catch attempts to replicate from within the middle of an event,
        avoiding strange failures or possible corruption.
      */
    }
    if (master_res)
    {
      mysql_free_result(master_res);
      master_res= NULL;
    }
  }
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err:
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  if (errmsg)
  {
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    if (master_res)
      mysql_free_result(master_res);
2082
    DBUG_ASSERT(err_code != 0);
2083
    mi->report(ERROR_LEVEL, err_code, "%s", err_buff);
2084
    DBUG_RETURN(1);
2085
  }
2086

2087
  DBUG_RETURN(0);
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network_err:
  if (master_res)
    mysql_free_result(master_res);
  DBUG_RETURN(2);
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slave_killed_err:
  if (master_res)
    mysql_free_result(master_res);
  DBUG_RETURN(2);
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}
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2100

2101
static bool wait_for_relay_log_space(Relay_log_info* rli)
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{
2103
  bool slave_killed=0;
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  Master_info* mi = rli->mi;
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  const char *save_proc_info;
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  THD* thd = mi->io_thd;
  DBUG_ENTER("wait_for_relay_log_space");
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  mysql_mutex_lock(&rli->log_space_lock);
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  save_proc_info= thd->enter_cond(&rli->log_space_cond,
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                                  &rli->log_space_lock,
                                  "\
2113
Waiting for the slave SQL thread to free enough relay log space");
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  while (rli->log_space_limit < rli->log_space_total &&
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         !(slave_killed=io_slave_killed(thd,mi)) &&
2116
         !rli->ignore_log_space_limit)
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    mysql_cond_wait(&rli->log_space_cond, &rli->log_space_lock);
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  /* 
    Makes the IO thread read only one event at a time
    until the SQL thread is able to purge the relay 
    logs, freeing some space.

    Therefore, once the SQL thread processes this next 
    event, it goes to sleep (no more events in the queue),
    sets ignore_log_space_limit=true and wakes the IO thread. 
    However, this event may have been enough already for 
    the SQL thread to purge some log files, freeing 
    rli->log_space_total .

    This guarantees that the SQL and IO thread move
    forward only one event at a time (to avoid deadlocks), 
    when the relay space limit is reached. It also 
    guarantees that when the SQL thread is prepared to
    rotate (to be able to purge some logs), the IO thread
    will know about it and will rotate.

    NOTE: The ignore_log_space_limit is only set when the SQL
          thread sleeps waiting for events.

   */
  if (rli->ignore_log_space_limit)
  {
#ifndef DBUG_OFF
    {
      char llbuf1[22], llbuf2[22];
      DBUG_PRINT("info", ("log_space_limit=%s "
                          "log_space_total=%s "
                          "ignore_log_space_limit=%d "
                          "sql_force_rotate_relay=%d", 
                        llstr(rli->log_space_limit,llbuf1),
                        llstr(rli->log_space_total,llbuf2),
                        (int) rli->ignore_log_space_limit,
                        (int) rli->sql_force_rotate_relay));
    }
#endif
    if (rli->sql_force_rotate_relay)
    {
2159
      mysql_mutex_lock(&mi->data_lock);
2160
      rotate_relay_log(rli->mi);
2161
      mysql_mutex_unlock(&mi->data_lock);
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      rli->sql_force_rotate_relay= false;
    }

    rli->ignore_log_space_limit= false;
  }

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  thd->exit_cond(save_proc_info);
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  DBUG_RETURN(slave_killed);
}
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2172

2173 2174
/*
  Builds a Rotate from the ignored events' info and writes it to relay log.
2175

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  SYNOPSIS
  write_ignored_events_info_to_relay_log()
    thd             pointer to I/O thread's thd
    mi

  DESCRIPTION
    Slave I/O thread, going to die, must leave a durable trace of the
    ignored events' end position for the use of the slave SQL thread, by
    calling this function. Only that thread can call it (see assertion).
 */
2186
static void write_ignored_events_info_to_relay_log(THD *thd, Master_info *mi)
2187
{
2188
  Relay_log_info *rli= &mi->rli;
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2189
  mysql_mutex_t *log_lock= rli->relay_log.get_log_lock();
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  DBUG_ENTER("write_ignored_events_info_to_relay_log");

2192
  DBUG_ASSERT(thd == mi->io_thd);
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  mysql_mutex_lock(log_lock);
2194
  if (rli->ign_master_log_name_end[0])
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  {
2196
    DBUG_PRINT("info",("writing a Rotate event to track down ignored events"));
2197
    Rotate_log_event *ev= new Rotate_log_event(rli->ign_master_log_name_end,
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                                               0, rli->ign_master_log_pos_end,
                                               Rotate_log_event::DUP_NAME);
    rli->ign_master_log_name_end[0]= 0;
    /* can unlock before writing as slave SQL thd will soon see our Rotate */
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    mysql_mutex_unlock(log_lock);
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    if (likely((bool)ev))
    {
      ev->server_id= 0; // don't be ignored by slave SQL thread
      if (unlikely(rli->relay_log.append(ev)))
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        mi->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_WRITE_FAILURE,
                   ER(ER_SLAVE_RELAY_LOG_WRITE_FAILURE),
                   "failed to write a Rotate event"
                   " to the relay log, SHOW SLAVE STATUS may be"
                   " inaccurate");
2212
      rli->relay_log.harvest_bytes_written(&rli->log_space_total);
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2213
      if (flush_master_info(mi, TRUE, TRUE))
2214
        sql_print_error("Failed to flush master info file");
2215 2216 2217
      delete ev;
    }
    else
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      mi->report(ERROR_LEVEL, ER_SLAVE_CREATE_EVENT_FAILURE,
                 ER(ER_SLAVE_CREATE_EVENT_FAILURE),
                 "Rotate_event (out of memory?),"
                 " SHOW SLAVE STATUS may be inaccurate");
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  }
2223
  else
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    mysql_mutex_unlock(log_lock);
2225
  DBUG_VOID_RETURN;
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}

2228

2229
int register_slave_on_master(MYSQL* mysql, Master_info *mi,
2230
                             bool *suppress_warnings)
2231
{
2232
  uchar buf[1024], *pos= buf;
2233
  uint report_host_len=0, report_user_len=0, report_password_len=0;
2234
  DBUG_ENTER("register_slave_on_master");
2235

2236
  *suppress_warnings= FALSE;
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  if (report_host)
    report_host_len= strlen(report_host);
  if (report_host_len > HOSTNAME_LENGTH)
  {
    sql_print_warning("The length of report_host is %d. "
                      "It is larger than the max length(%d), so this "
                      "slave cannot be registered to the master.",
                      report_host_len, HOSTNAME_LENGTH);
2245
    DBUG_RETURN(0);
2246 2247
  }

2248
  if (report_user)
2249
    report_user_len= strlen(report_user);
2250 2251 2252 2253 2254 2255 2256 2257 2258
  if (report_user_len > USERNAME_LENGTH)
  {
    sql_print_warning("The length of report_user is %d. "
                      "It is larger than the max length(%d), so this "
                      "slave cannot be registered to the master.",
                      report_user_len, USERNAME_LENGTH);
    DBUG_RETURN(0);
  }

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  if (report_password)
2260
    report_password_len= strlen(report_password);
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  if (report_password_len > MAX_PASSWORD_LENGTH)
  {
    sql_print_warning("The length of report_password is %d. "
                      "It is larger than the max length(%d), so this "
                      "slave cannot be registered to the master.",
                      report_password_len, MAX_PASSWORD_LENGTH);
    DBUG_RETURN(0);
  }
2269

2270
  int4store(pos, global_system_variables.server_id); pos+= 4;
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  pos= net_store_data(pos, (uchar*) report_host, report_host_len);
  pos= net_store_data(pos, (uchar*) report_user, report_user_len);
  pos= net_store_data(pos, (uchar*) report_password, report_password_len);
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  int2store(pos, (uint16) report_port); pos+= 2;
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  /* 
    Fake rpl_recovery_rank, which was removed in BUG#13963,
    so that this server can register itself on old servers,
    see BUG#49259.
   */
  int4store(pos, /* rpl_recovery_rank */ 0);    pos+= 4;
2281
  /* The master will fill in master_id */
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  int4store(pos, 0);                    pos+= 4;
2283

2284
  if (simple_command(mysql, COM_REGISTER_SLAVE, buf, (size_t) (pos- buf), 0))
2285
  {
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    if (mysql_errno(mysql) == ER_NET_READ_INTERRUPTED)
    {
      *suppress_warnings= TRUE;                 // Suppress reconnect warning
    }
2290
    else if (!check_io_slave_killed(mi->io_thd, mi, NULL))
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    {
      char buf[256];
      my_snprintf(buf, sizeof(buf), "%s (Errno: %d)", mysql_error(mysql), 
                  mysql_errno(mysql));
      mi->report(ERROR_LEVEL, ER_SLAVE_MASTER_COM_FAILURE,
                 ER(ER_SLAVE_MASTER_COM_FAILURE), "COM_REGISTER_SLAVE", buf);
    }
2298
    DBUG_RETURN(1);
2299
  }
2300
  DBUG_RETURN(0);
2301 2302
}

2303

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/**
  Execute a SHOW SLAVE STATUS statement.

  @param thd Pointer to THD object for the client thread executing the
  statement.

  @param mi Pointer to Master_info object for the IO thread.

  @retval FALSE success
  @retval TRUE failure
*/
2315 2316 2317 2318

bool show_master_info(THD *thd, Master_info *mi, bool full)
{
  DBUG_ENTER("show_master_info");
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  String gtid_pos;
2320

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  if (full && rpl_global_gtid_slave_state.tostring(&gtid_pos, NULL, 0))
2322
    DBUG_RETURN(TRUE);
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  if (send_show_master_info_header(thd, full, gtid_pos.length()))
    DBUG_RETURN(TRUE);
  if (send_show_master_info_data(thd, mi, full, &gtid_pos))
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    DBUG_RETURN(TRUE);
  my_eof(thd);
  DBUG_RETURN(FALSE);
}

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static bool send_show_master_info_header(THD *thd, bool full,
                                         size_t gtid_pos_length)
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{
  List<Item> field_list;
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  Protocol *protocol= thd->protocol;
2336
  Master_info *mi;
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  DBUG_ENTER("show_master_info_header");

  if (full)
2340
  {
2341 2342
    field_list.push_back(new Item_empty_string("Connection_name",
                                               MAX_CONNECTION_NAME));
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    field_list.push_back(new Item_empty_string("Slave_SQL_State",
                                               30));
  }
2346

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  field_list.push_back(new Item_empty_string("Slave_IO_State",
2348
                                                     30));
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  field_list.push_back(new Item_empty_string("Master_Host",
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                                                     sizeof(mi->host)));
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  field_list.push_back(new Item_empty_string("Master_User",
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                                                     sizeof(mi->user)));
2353
  field_list.push_back(new Item_return_int("Master_Port", 7,
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                                           MYSQL_TYPE_LONG));
2355
  field_list.push_back(new Item_return_int("Connect_Retry", 10,
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                                           MYSQL_TYPE_LONG));
2357
  field_list.push_back(new Item_empty_string("Master_Log_File",
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                                             FN_REFLEN));
2359
  field_list.push_back(new Item_return_int("Read_Master_Log_Pos", 10,
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                                           MYSQL_TYPE_LONGLONG));
2361
  field_list.push_back(new Item_empty_string("Relay_Log_File",
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                                             FN_REFLEN));
2363
  field_list.push_back(new Item_return_int("Relay_Log_Pos", 10,
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                                           MYSQL_TYPE_LONGLONG));
2365
  field_list.push_back(new Item_empty_string("Relay_Master_Log_File",
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                                             FN_REFLEN));
2367 2368
  field_list.push_back(new Item_empty_string("Slave_IO_Running", 3));
  field_list.push_back(new Item_empty_string("Slave_SQL_Running", 3));
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  field_list.push_back(new Item_empty_string("Replicate_Do_DB", 20));
  field_list.push_back(new Item_empty_string("Replicate_Ignore_DB", 20));
  field_list.push_back(new Item_empty_string("Replicate_Do_Table", 20));
  field_list.push_back(new Item_empty_string("Replicate_Ignore_Table", 23));
  field_list.push_back(new Item_empty_string("Replicate_Wild_Do_Table", 24));
  field_list.push_back(new Item_empty_string("Replicate_Wild_Ignore_Table",
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                                             28));
2376 2377 2378
  field_list.push_back(new Item_return_int("Last_Errno", 4, MYSQL_TYPE_LONG));
  field_list.push_back(new Item_empty_string("Last_Error", 20));
  field_list.push_back(new Item_return_int("Skip_Counter", 10,
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                                           MYSQL_TYPE_LONG));
2380
  field_list.push_back(new Item_return_int("Exec_Master_Log_Pos", 10,
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                                           MYSQL_TYPE_LONGLONG));
2382
  field_list.push_back(new Item_return_int("Relay_Log_Space", 10,
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                                           MYSQL_TYPE_LONGLONG));
2384
  field_list.push_back(new Item_empty_string("Until_Condition", 6));
2385
  field_list.push_back(new Item_empty_string("Until_Log_File", FN_REFLEN));
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  field_list.push_back(new Item_return_int("Until_Log_Pos", 10,
2387
                                           MYSQL_TYPE_LONGLONG));
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  field_list.push_back(new Item_empty_string("Master_SSL_Allowed", 7));
  field_list.push_back(new Item_empty_string("Master_SSL_CA_File",
                                             sizeof(mi->ssl_ca)));
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  field_list.push_back(new Item_empty_string("Master_SSL_CA_Path",
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                                             sizeof(mi->ssl_capath)));
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2393
  field_list.push_back(new Item_empty_string("Master_SSL_Cert",
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                                             sizeof(mi->ssl_cert)));
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2395
  field_list.push_back(new Item_empty_string("Master_SSL_Cipher",
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                                             sizeof(mi->ssl_cipher)));
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2397
  field_list.push_back(new Item_empty_string("Master_SSL_Key",
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                                             sizeof(mi->ssl_key)));
2399
  field_list.push_back(new Item_return_int("Seconds_Behind_Master", 10,
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                                           MYSQL_TYPE_LONGLONG));
2401 2402
  field_list.push_back(new Item_empty_string("Master_SSL_Verify_Server_Cert",
                                             3));
2403 2404 2405 2406
  field_list.push_back(new Item_return_int("Last_IO_Errno", 4, MYSQL_TYPE_LONG));
  field_list.push_back(new Item_empty_string("Last_IO_Error", 20));
  field_list.push_back(new Item_return_int("Last_SQL_Errno", 4, MYSQL_TYPE_LONG));
  field_list.push_back(new Item_empty_string("Last_SQL_Error", 20));
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  field_list.push_back(new Item_empty_string("Replicate_Ignore_Server_Ids",
                                             FN_REFLEN));
  field_list.push_back(new Item_return_int("Master_Server_Id", sizeof(ulong),
                                           MYSQL_TYPE_LONG));
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  field_list.push_back(new Item_empty_string("Using_Gtid",
                                             sizeof("Current_Pos")-1));
2413 2414 2415 2416 2417 2418 2419 2420
  if (full)
  {
    field_list.push_back(new Item_return_int("Retried_transactions",
                                             10, MYSQL_TYPE_LONG));
    field_list.push_back(new Item_return_int("Max_relay_log_size",
                                             10, MYSQL_TYPE_LONGLONG));
    field_list.push_back(new Item_return_int("Executed_log_entries",
                                             10, MYSQL_TYPE_LONG));
2421 2422 2423 2424
    field_list.push_back(new Item_return_int("Slave_received_heartbeats",
                                             10, MYSQL_TYPE_LONG));
    field_list.push_back(new Item_float("Slave_heartbeat_period",
                                        0.0, 3, 10));
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    field_list.push_back(new Item_empty_string("Gtid_Slave_Pos",
                                               gtid_pos_length));
2427
  }
2428
  if (protocol->send_result_set_metadata(&field_list,
2429
                            Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
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2430
    DBUG_RETURN(TRUE);
2431 2432 2433 2434
  DBUG_RETURN(FALSE);
}


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2435 2436
static bool send_show_master_info_data(THD *thd, Master_info *mi, bool full,
                                       String *gtid_pos)
2437 2438
{
  DBUG_ENTER("send_show_master_info_data");
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2439

2440 2441
  if (mi->host[0])
  {
2442
    DBUG_PRINT("info",("host is set: '%s'", mi->host));
2443
    String *packet= &thd->packet;
2444
    Protocol *protocol= thd->protocol;
2445
    Rpl_filter *rpl_filter= mi->rpl_filter;
2446 2447
    char buf[256];
    String tmp(buf, sizeof(buf), &my_charset_bin);
2448

2449
    protocol->prepare_for_resend();
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2450

2451
    /*
2452 2453
      slave_running can be accessed without run_lock but not other
      non-volotile members like mi->io_thd, which is guarded by the mutex.
2454
    */
2455 2456 2457
    if (full)
      protocol->store(mi->connection_name.str, mi->connection_name.length,
                      &my_charset_bin);
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2458
    mysql_mutex_lock(&mi->run_lock);
2459 2460 2461
    if (full)
      protocol->store(mi->rli.sql_thd ? mi->rli.sql_thd->proc_info : "",
                      &my_charset_bin);
2462
    protocol->store(mi->io_thd ? mi->io_thd->proc_info : "", &my_charset_bin);
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2463
    mysql_mutex_unlock(&mi->run_lock);
2464

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    mysql_mutex_lock(&mi->data_lock);
    mysql_mutex_lock(&mi->rli.data_lock);
    mysql_mutex_lock(&mi->err_lock);
    mysql_mutex_lock(&mi->rli.err_lock);
2469 2470
    protocol->store(mi->host, &my_charset_bin);
    protocol->store(mi->user, &my_charset_bin);
2471 2472
    protocol->store((uint32) mi->port);
    protocol->store((uint32) mi->connect_retry);
2473
    protocol->store(mi->master_log_name, &my_charset_bin);
2474
    protocol->store((ulonglong) mi->master_log_pos);
2475
    protocol->store(mi->rli.group_relay_log_name +
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2476 2477
                    dirname_length(mi->rli.group_relay_log_name),
                    &my_charset_bin);
2478 2479
    protocol->store((ulonglong) mi->rli.group_relay_log_pos);
    protocol->store(mi->rli.group_master_log_name, &my_charset_bin);
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2480
    protocol->store(mi->slave_running == MYSQL_SLAVE_RUN_CONNECT ?
2481 2482
                    "Yes" : (mi->slave_running == MYSQL_SLAVE_RUN_NOT_CONNECT ?
                             "Connecting" : "No"), &my_charset_bin);
2483
    protocol->store(mi->rli.slave_running ? "Yes":"No", &my_charset_bin);
2484 2485 2486 2487
    protocol->store(rpl_filter->get_do_db());
    protocol->store(rpl_filter->get_ignore_db());

    rpl_filter->get_do_table(&tmp);
2488
    protocol->store(&tmp);
2489
    rpl_filter->get_ignore_table(&tmp);
2490
    protocol->store(&tmp);
2491
    rpl_filter->get_wild_do_table(&tmp);
2492
    protocol->store(&tmp);
2493
    rpl_filter->get_wild_ignore_table(&tmp);
2494 2495
    protocol->store(&tmp);

2496 2497
    protocol->store(mi->rli.last_error().number);
    protocol->store(mi->rli.last_error().message, &my_charset_bin);
2498
    protocol->store((uint32) mi->rli.slave_skip_counter);
2499
    protocol->store((ulonglong) mi->rli.group_master_log_pos);
2500
    protocol->store((ulonglong) mi->rli.log_space_total);
2501 2502

    protocol->store(
2503 2504
      mi->rli.until_condition==Relay_log_info::UNTIL_NONE ? "None":
        ( mi->rli.until_condition==Relay_log_info::UNTIL_MASTER_POS? "Master":
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2505 2506
          ( mi->rli.until_condition==Relay_log_info::UNTIL_RELAY_POS? "Relay":
            "Gtid")), &my_charset_bin);
2507 2508
    protocol->store(mi->rli.until_log_name, &my_charset_bin);
    protocol->store((ulonglong) mi->rli.until_log_pos);
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2509 2510

#ifdef HAVE_OPENSSL
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    protocol->store(mi->ssl? "Yes":"No", &my_charset_bin);
#else
    protocol->store(mi->ssl? "Ignored":"No", &my_charset_bin);
#endif
    protocol->store(mi->ssl_ca, &my_charset_bin);
    protocol->store(mi->ssl_capath, &my_charset_bin);
    protocol->store(mi->ssl_cert, &my_charset_bin);
    protocol->store(mi->ssl_cipher, &my_charset_bin);
    protocol->store(mi->ssl_key, &my_charset_bin);
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2521 2522 2523 2524 2525 2526
    /*
      Seconds_Behind_Master: if SQL thread is running and I/O thread is
      connected, we can compute it otherwise show NULL (i.e. unknown).
    */
    if ((mi->slave_running == MYSQL_SLAVE_RUN_CONNECT) &&
        mi->rli.slave_running)
2527
    {
2528
      long time_diff= ((long)(time(0) - mi->rli.last_master_timestamp)
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                       - mi->clock_diff_with_master);
2530
      /*
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2531 2532
        Apparently on some systems time_diff can be <0. Here are possible
        reasons related to MySQL:
2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544
        - the master is itself a slave of another master whose time is ahead.
        - somebody used an explicit SET TIMESTAMP on the master.
        Possible reason related to granularity-to-second of time functions
        (nothing to do with MySQL), which can explain a value of -1:
        assume the master's and slave's time are perfectly synchronized, and
        that at slave's connection time, when the master's timestamp is read,
        it is at the very end of second 1, and (a very short time later) when
        the slave's timestamp is read it is at the very beginning of second
        2. Then the recorded value for master is 1 and the recorded value for
        slave is 2. At SHOW SLAVE STATUS time, assume that the difference
        between timestamp of slave and rli->last_master_timestamp is 0
        (i.e. they are in the same second), then we get 0-(2-1)=-1 as a result.
2545 2546 2547 2548
        This confuses users, so we don't go below 0: hence the max().

        last_master_timestamp == 0 (an "impossible" timestamp 1970) is a
        special marker to say "consider we have caught up".
2549
      */
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2550 2551
      protocol->store((longlong)(mi->rli.last_master_timestamp ?
                                 max(0, time_diff) : 0));
2552
    }
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2553
    else
2554
    {
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      protocol->store_null();
2556 2557
    }
    protocol->store(mi->ssl_verify_server_cert? "Yes":"No", &my_charset_bin);
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2558

2559
    // Last_IO_Errno
2560
    protocol->store(mi->last_error().number);
2561
    // Last_IO_Error
2562
    protocol->store(mi->last_error().message, &my_charset_bin);
2563
    // Last_SQL_Errno
2564
    protocol->store(mi->rli.last_error().number);
2565
    // Last_SQL_Error
2566
    protocol->store(mi->rli.last_error().message, &my_charset_bin);
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    // Replicate_Ignore_Server_Ids
    {
      char buff[FN_REFLEN];
      ulong i, cur_len;
      for (i= 0, buff[0]= 0, cur_len= 0;
           i < mi->ignore_server_ids.elements; i++)
      {
        ulong s_id, slen;
        char sbuff[FN_REFLEN];
        get_dynamic(&mi->ignore_server_ids, (uchar*) &s_id, i);
2577
        slen= sprintf(sbuff, (i==0? "%lu" : ", %lu"), s_id);
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        if (cur_len + slen + 4 > FN_REFLEN)
        {
          /*
            break the loop whenever remained space could not fit
            ellipses on the next cycle
          */
2584
          sprintf(buff + cur_len, "...");
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2585 2586
          break;
        }
2587
        cur_len += sprintf(buff + cur_len, "%s", sbuff);
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      }
      protocol->store(buff, &my_charset_bin);
    }
    // Master_Server_id
    protocol->store((uint32) mi->master_id);
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    protocol->store(mi->using_gtid_astext(mi->using_gtid), &my_charset_bin);
2594 2595 2596 2597 2598
    if (full)
    {
      protocol->store((uint32)    mi->rli.retried_trans);
      protocol->store((ulonglong) mi->rli.max_relay_log_size);
      protocol->store((uint32)    mi->rli.executed_entries);
2599 2600
      protocol->store((uint32)    mi->received_heartbeats);
      protocol->store((double)    mi->heartbeat_period, 3, &tmp);
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      protocol->store(gtid_pos->ptr(), gtid_pos->length(), &my_charset_bin);
2602
    }
2603

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    mysql_mutex_unlock(&mi->rli.err_lock);
    mysql_mutex_unlock(&mi->err_lock);
    mysql_mutex_unlock(&mi->rli.data_lock);
    mysql_mutex_unlock(&mi->data_lock);
2608

2609
    if (my_net_write(&thd->net, (uchar*) thd->packet.ptr(), packet->length()))
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      DBUG_RETURN(TRUE);
2611
  }
2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635
  DBUG_RETURN(FALSE);
}


/* Used to sort connections by name */

static int cmp_mi_by_name(const Master_info **arg1,
                          const Master_info **arg2)
{
  return my_strcasecmp(system_charset_info, (*arg1)->connection_name.str,
                       (*arg2)->connection_name.str);
}


/**
  Execute a SHOW FULL SLAVE STATUS statement.

  @param thd Pointer to THD object for the client thread executing the
  statement.

  Elements are sorted according to the original connection_name.

  @retval FALSE success
  @retval TRUE failure
2636 2637 2638

  @note
  master_info_index is protected by LOCK_active_mi.
2639 2640 2641 2642 2643
*/

bool show_all_master_info(THD* thd)
{
  uint i, elements;
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  String gtid_pos;
2645 2646
  Master_info **tmp;
  DBUG_ENTER("show_master_info");
2647
  mysql_mutex_assert_owner(&LOCK_active_mi);
2648

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2649 2650 2651 2652 2653 2654
  gtid_pos.length(0);
  if (rpl_append_gtid_state(&gtid_pos, true))
  {
    my_error(ER_OUT_OF_RESOURCES, MYF(0));
    DBUG_RETURN(TRUE);
  }
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2655 2656

  if (send_show_master_info_header(thd, 1, gtid_pos.length()))
2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677
    DBUG_RETURN(TRUE);

  if (!(elements= master_info_index->master_info_hash.records))
    goto end;

  /*
    Sort lines to get them into a predicted order
    (needed for test cases and to not confuse users)
  */
  if (!(tmp= (Master_info**) thd->alloc(sizeof(Master_info*) * elements)))
    DBUG_RETURN(TRUE);

  for (i= 0; i < elements; i++)
  {
    tmp[i]= (Master_info *) my_hash_element(&master_info_index->
                                            master_info_hash, i);
  }
  my_qsort(tmp, elements, sizeof(Master_info*), (qsort_cmp) cmp_mi_by_name);

  for (i= 0; i < elements; i++)
  {
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2678
    if (send_show_master_info_data(thd, tmp[i], 1, &gtid_pos))
2679 2680 2681 2682
      DBUG_RETURN(TRUE);
  }

end:
2683
  my_eof(thd);
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2684
  DBUG_RETURN(FALSE);
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2685 2686
}

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2687

2688 2689
void set_slave_thread_options(THD* thd)
{
2690
  DBUG_ENTER("set_slave_thread_options");
2691 2692 2693 2694 2695 2696 2697 2698 2699
  /*
     It's nonsense to constrain the slave threads with max_join_size; if a
     query succeeded on master, we HAVE to execute it. So set
     OPTION_BIG_SELECTS. Setting max_join_size to HA_POS_ERROR is not enough
     (and it's not needed if we have OPTION_BIG_SELECTS) because an INSERT
     SELECT examining more than 4 billion rows would still fail (yes, because
     when max_join_size is 4G, OPTION_BIG_SELECTS is automatically set, but
     only for client threads.
  */
2700
  ulonglong options= thd->variables.option_bits | OPTION_BIG_SELECTS;
2701 2702 2703 2704
  if (opt_log_slave_updates)
    options|= OPTION_BIN_LOG;
  else
    options&= ~OPTION_BIN_LOG;
2705
  thd->variables.option_bits= options;
2706
  thd->variables.completion_type= 0;
2707
  DBUG_VOID_RETURN;
2708
}
2709

2710
void set_slave_thread_default_charset(THD* thd, Relay_log_info const *rli)
2711
{
2712 2713
  DBUG_ENTER("set_slave_thread_default_charset");

2714 2715 2716 2717 2718 2719 2720
  thd->variables.character_set_client=
    global_system_variables.character_set_client;
  thd->variables.collation_connection=
    global_system_variables.collation_connection;
  thd->variables.collation_server=
    global_system_variables.collation_server;
  thd->update_charset();
2721 2722 2723 2724 2725 2726 2727

  /*
    We use a const cast here since the conceptual (and externally
    visible) behavior of the function is to set the default charset of
    the thread.  That the cache has to be invalidated is a secondary
    effect.
   */
2728
  const_cast<Relay_log_info*>(rli)->cached_charset_invalidate();
2729
  DBUG_VOID_RETURN;
2730 2731
}

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2732
/*
2733
  init_slave_thread()
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2734
*/
2735

2736 2737
static int init_slave_thread(THD* thd, Master_info *mi,
                             SLAVE_THD_TYPE thd_type)
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2738 2739
{
  DBUG_ENTER("init_slave_thread");
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Sergei Golubchik committed
2740
  int simulate_error __attribute__((unused))= 0;
2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753
  DBUG_EXECUTE_IF("simulate_io_slave_error_on_init",
                  simulate_error|= (1 << SLAVE_THD_IO););
  DBUG_EXECUTE_IF("simulate_sql_slave_error_on_init",
                  simulate_error|= (1 << SLAVE_THD_SQL););
  /* We must call store_globals() before doing my_net_init() */
  if (init_thr_lock() || thd->store_globals() ||
      my_net_init(&thd->net, 0, MYF(MY_THREAD_SPECIFIC)) ||
      IF_DBUG(simulate_error & (1<< thd_type), 0))
  {
    thd->cleanup();
    DBUG_RETURN(-1);
  }

2754
  thd->system_thread = (thd_type == SLAVE_THD_SQL) ?
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2755
    SYSTEM_THREAD_SLAVE_SQL : SYSTEM_THREAD_SLAVE_IO;
2756
  thd->security_ctx->skip_grants();
2757 2758 2759 2760 2761
/*
  Adding MAX_LOG_EVENT_HEADER_LEN to the max_allowed_packet on all
  slave threads, since a replication event can become this much larger
  than the corresponding packet (query) sent from client to master.
*/
2762
  thd->variables.max_allowed_packet= slave_max_allowed_packet;
2763 2764
  thd->slave_thread= 1;
  thd->connection_name= mi->connection_name;
2765
  thd->enable_slow_log= opt_log_slow_slave_statements;
2766
  thd->variables.log_slow_filter= global_system_variables.log_slow_filter;
2767
  set_slave_thread_options(thd);
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2768
  thd->client_capabilities = CLIENT_LOCAL_FILES;
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2769
  mysql_mutex_lock(&LOCK_thread_count);
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2770
  thd->thread_id= thd->variables.pseudo_thread_id= thread_id++;
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2771
  mysql_mutex_unlock(&LOCK_thread_count);
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2772

2773
  if (thd_type == SLAVE_THD_SQL)
2774
    thd_proc_info(thd, "Waiting for the next event in relay log");
2775
  else
2776
    thd_proc_info(thd, "Waiting for master update");
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2777
  thd->set_time();
2778 2779
  /* Do not use user-supplied timeout value for system threads. */
  thd->variables.lock_wait_timeout= LONG_TIMEOUT;
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2780 2781 2782
  DBUG_RETURN(0);
}

2783 2784 2785 2786 2787 2788 2789
/*
  Sleep for a given amount of time or until killed.

  @param thd        Thread context of the current thread.
  @param seconds    The number of seconds to sleep.
  @param func       Function object to check if the thread has been killed.
  @param info       The Rpl_info object associated with this sleep.
2790

2791 2792 2793 2794 2795
  @retval True if the thread has been killed, false otherwise.
*/
template <typename killed_func, typename rpl_info>
static inline bool slave_sleep(THD *thd, time_t seconds,
                               killed_func func, rpl_info info)
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2796
{
2797

2798 2799 2800
  bool ret;
  struct timespec abstime;
  const char *old_proc_info;
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2801

2802 2803
  mysql_mutex_t *lock= &info->sleep_lock;
  mysql_cond_t *cond= &info->sleep_cond;
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2804

2805 2806 2807 2808 2809 2810 2811 2812 2813 2814
  /* Absolute system time at which the sleep time expires. */
  set_timespec(abstime, seconds);
  mysql_mutex_lock(lock);
  old_proc_info= thd->enter_cond(cond, lock, thd->proc_info);

  while (! (ret= func(thd, info)))
  {
    int error= mysql_cond_timedwait(cond, lock, &abstime);
    if (error == ETIMEDOUT || error == ETIME)
      break;
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2815
  }
2816 2817 2818
  /* Implicitly unlocks the mutex. */
  thd->exit_cond(old_proc_info);
  return ret;
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}

2821

He Zhenxing's avatar
He Zhenxing committed
2822 2823
static int request_dump(THD *thd, MYSQL* mysql, Master_info* mi,
			bool *suppress_warnings)
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2824
{
2825
  uchar buf[FN_REFLEN + 10];
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  int len;
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2827
  ushort binlog_flags = 0; // for now
2828
  char* logname = mi->master_log_name;
2829
  DBUG_ENTER("request_dump");
2830 2831
  
  *suppress_warnings= FALSE;
2832

2833
  if (opt_log_slave_updates && opt_replicate_annotate_row_events)
2834 2835
    binlog_flags|= BINLOG_SEND_ANNOTATE_ROWS_EVENT;

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2836 2837 2838 2839 2840
  if (RUN_HOOK(binlog_relay_io,
               before_request_transmit,
               (thd, mi, binlog_flags)))
    DBUG_RETURN(1);
  
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2841
  // TODO if big log files: Change next to int8store()
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2842
  int4store(buf, (ulong) mi->master_log_pos);
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  int2store(buf + 4, binlog_flags);
2844
  int4store(buf + 6, global_system_variables.server_id);
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2845
  len = (uint) strlen(logname);
2846
  memcpy(buf + 10, logname,len);
unknown's avatar
SCRUM  
unknown committed
2847
  if (simple_command(mysql, COM_BINLOG_DUMP, buf, len + 10, 1))
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2848
  {
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2849 2850 2851 2852 2853
    /*
      Something went wrong, so we will just reconnect and retry later
      in the future, we should do a better error analysis, but for
      now we just fill up the error log :-)
    */
unknown's avatar
SCRUM  
unknown committed
2854
    if (mysql_errno(mysql) == ER_NET_READ_INTERRUPTED)
2855
      *suppress_warnings= TRUE;                 // Suppress reconnect warning
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2856
    else
2857
      sql_print_error("Error on COM_BINLOG_DUMP: %d  %s, will retry in %d secs",
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2858
                      mysql_errno(mysql), mysql_error(mysql),
2859
                      mi->connect_retry);
2860
    DBUG_RETURN(1);
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2861
  }
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2862

2863
  DBUG_RETURN(0);
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2864 2865
}

2866

unknown's avatar
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2867
/*
2868
  Read one event from the master
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2869

unknown's avatar
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2870 2871
  SYNOPSIS
    read_event()
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    mysql               MySQL connection
    mi                  Master connection information
    suppress_warnings   TRUE when a normal net read timeout has caused us to
                        try a reconnect.  We do not want to print anything to
                        the error log in this case because this a anormal
                        event in an idle server.
2878

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2879
    RETURN VALUES
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2880 2881
    'packet_error'      Error
    number              Length of packet
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2882 2883
*/

2884
static ulong read_event(MYSQL* mysql, Master_info *mi, bool* suppress_warnings)
unknown's avatar
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2885
{
2886
  ulong len;
2887
  DBUG_ENTER("read_event");
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2888

2889
  *suppress_warnings= FALSE;
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2890 2891 2892 2893
  /*
    my_real_read() will time us out
    We check if we were told to die, and if not, try reading again
  */
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2894
#ifndef DBUG_OFF
2895
  if (disconnect_slave_event_count && !(mi->events_till_disconnect--))
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2896
    DBUG_RETURN(packet_error);
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2897
#endif
unknown's avatar
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2898

2899
  len = cli_safe_read(mysql);
2900
  if (len == packet_error || (long) len < 1)
unknown's avatar
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2901
  {
unknown's avatar
SCRUM  
unknown committed
2902
    if (mysql_errno(mysql) == ER_NET_READ_INTERRUPTED)
unknown's avatar
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2903 2904
    {
      /*
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2905 2906 2907
        We are trying a normal reconnect after a read timeout;
        we suppress prints to .err file as long as the reconnect
        happens without problems
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2908 2909 2910 2911
      */
      *suppress_warnings= TRUE;
    }
    else
2912
      sql_print_error("Error reading packet from server: %s ( server_errno=%d)",
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2913
                      mysql_error(mysql), mysql_errno(mysql));
2914
    DBUG_RETURN(packet_error);
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2915 2916
  }

2917 2918
  /* Check if eof packet */
  if (len < 8 && mysql->net.read_pos[0] == 254)
unknown's avatar
unknown committed
2919
  {
2920 2921
    sql_print_information("Slave: received end packet from server, apparent "
                          "master shutdown: %s",
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2922
                     mysql_error(mysql));
2923
     DBUG_RETURN(packet_error);
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2924
  }
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2925

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2926
  DBUG_PRINT("exit", ("len: %lu  net->read_pos[4]: %d",
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2927 2928
                      len, mysql->net.read_pos[4]));
  DBUG_RETURN(len - 1);
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2929 2930
}

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2931 2932 2933 2934 2935 2936 2937 2938 2939
/*
  Check if the current error is of temporary nature of not.
  Some errors are temporary in nature, such as
  ER_LOCK_DEADLOCK and ER_LOCK_WAIT_TIMEOUT.  Ndb also signals
  that the error is temporary by pushing a warning with the error code
  ER_GET_TEMPORARY_ERRMSG, if the originating error is temporary.
*/
static int has_temporary_error(THD *thd)
{
2940 2941
  DBUG_ENTER("has_temporary_error");

2942
  DBUG_EXECUTE_IF("all_errors_are_temporary_errors",
Marc Alff's avatar
Marc Alff committed
2943
                  if (thd->stmt_da->is_error())
2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955
                  {
                    thd->clear_error();
                    my_error(ER_LOCK_DEADLOCK, MYF(0));
                  });

  /*
    If there is no message in THD, we can't say if it's a temporary
    error or not. This is currently the case for Incident_log_event,
    which sets no message. Return FALSE.
  */
  if (!thd->is_error())
    DBUG_RETURN(0);
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2956 2957 2958 2959 2960 2961

  /*
    Temporary error codes:
    currently, InnoDB deadlock detected by InnoDB or lock
    wait timeout (innodb_lock_wait_timeout exceeded
  */
Marc Alff's avatar
Marc Alff committed
2962 2963
  if (thd->stmt_da->sql_errno() == ER_LOCK_DEADLOCK ||
      thd->stmt_da->sql_errno() == ER_LOCK_WAIT_TIMEOUT)
2964
    DBUG_RETURN(1);
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2965 2966 2967 2968 2969

#ifdef HAVE_NDB_BINLOG
  /*
    currently temporary error set in ndbcluster
  */
Marc Alff's avatar
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2970
  List_iterator_fast<MYSQL_ERROR> it(thd->warning_info->warn_list());
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  MYSQL_ERROR *err;
  while ((err= it++))
  {
Marc Alff's avatar
Marc Alff committed
2974 2975 2976
    DBUG_PRINT("info", ("has condition %d %s", err->get_sql_errno(),
                        err->get_message_text()));
    switch (err->get_sql_errno())
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2977 2978
    {
    case ER_GET_TEMPORARY_ERRMSG:
2979
      DBUG_RETURN(1);
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2980 2981 2982 2983 2984
    default:
      break;
    }
  }
#endif
2985
  DBUG_RETURN(0);
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2986
}
2987

2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014

/**
  Applies the given event and advances the relay log position.

  In essence, this function does:

  @code
    ev->apply_event(rli);
    ev->update_pos(rli);
  @endcode

  But it also does some maintainance, such as skipping events if
  needed and reporting errors.

  If the @c skip flag is set, then it is tested whether the event
  should be skipped, by looking at the slave_skip_counter and the
  server id.  The skip flag should be set when calling this from a
  replication thread but not set when executing an explicit BINLOG
  statement.

  @retval 0 OK.

  @retval 1 Error calling ev->apply_event().

  @retval 2 No error calling ev->apply_event(), but error calling
  ev->update_pos().
*/
3015
int apply_event_and_update_pos(Log_event* ev, THD* thd, Relay_log_info* rli)
3016 3017 3018 3019 3020 3021 3022 3023 3024
{
  int exec_res= 0;

  DBUG_ENTER("apply_event_and_update_pos");

  DBUG_PRINT("exec_event",("%s(type_code: %d; server_id: %d)",
                           ev->get_type_str(), ev->get_type_code(),
                           ev->server_id));
  DBUG_PRINT("info", ("thd->options: %s%s; rli->last_event_start_time: %lu",
3025 3026
                      FLAGSTR(thd->variables.option_bits, OPTION_NOT_AUTOCOMMIT),
                      FLAGSTR(thd->variables.option_bits, OPTION_BEGIN),
3027
                      (ulong) rli->last_event_start_time));
3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052

  /*
    Execute the event to change the database and update the binary
    log coordinates, but first we set some data that is needed for
    the thread.

    The event will be executed unless it is supposed to be skipped.

    Queries originating from this server must be skipped.  Low-level
    events (Format_description_log_event, Rotate_log_event,
    Stop_log_event) from this server must also be skipped. But for
    those we don't want to modify 'group_master_log_pos', because
    these events did not exist on the master.
    Format_description_log_event is not completely skipped.

    Skip queries specified by the user in 'slave_skip_counter'.  We
    can't however skip events that has something to do with the log
    files themselves.

    Filtering on own server id is extremely important, to ignore
    execution of events created by the creation/rotation of the relay
    log (remember that now the relay log starts with its Format_desc,
    has a Rotate etc).
  */

3053 3054
  /* Use the original server id for logging. */
  thd->variables.server_id = ev->server_id;
3055 3056 3057
  thd->set_time();                            // time the query
  thd->lex->current_select= 0;
  if (!ev->when)
3058 3059
  {
    my_hrtime_t hrtime= my_hrtime();
3060
    ev->when= hrtime_to_my_time(hrtime);
3061 3062
    ev->when_sec_part= hrtime_sec_part(hrtime);
  }
3063 3064
  thd->variables.option_bits=
    (thd->variables.option_bits & ~OPTION_SKIP_REPLICATION) |
3065
    (ev->flags & LOG_EVENT_SKIP_REPLICATION_F ? OPTION_SKIP_REPLICATION : 0);
3066 3067
  ev->thd = thd; // because up to this point, ev->thd == 0

3068 3069
  int reason= ev->shall_skip(rli);
  if (reason == Log_event::EVENT_SKIP_COUNT)
3070 3071 3072 3073
  {
    DBUG_ASSERT(rli->slave_skip_counter > 0);
    rli->slave_skip_counter--;
  }
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3074
  mysql_mutex_unlock(&rli->data_lock);
3075 3076 3077
  if (reason == Log_event::EVENT_SKIP_NOT)
    exec_res= ev->apply_event(rli);

3078
#ifndef DBUG_OFF
3079 3080
  /*
    This only prints information to the debug trace.
3081

3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092
    TODO: Print an informational message to the error log?
  */
  static const char *const explain[] = {
    // EVENT_SKIP_NOT,
    "not skipped",
    // EVENT_SKIP_IGNORE,
    "skipped because event should be ignored",
    // EVENT_SKIP_COUNT
    "skipped because event skip counter was non-zero"
  };
  DBUG_PRINT("info", ("OPTION_BEGIN: %d; IN_STMT: %d",
3093
                      test(thd->variables.option_bits & OPTION_BEGIN),
3094 3095 3096
                      rli->get_flag(Relay_log_info::IN_STMT)));
  DBUG_PRINT("skip_event", ("%s event was %s",
                            ev->get_type_str(), explain[reason]));
3097 3098 3099 3100 3101 3102
#endif

  DBUG_PRINT("info", ("apply_event error = %d", exec_res));
  if (exec_res == 0)
  {
    int error= ev->update_pos(rli);
3103
#ifdef HAVE_valgrind
3104 3105 3106
    if (!rli->is_fake)
#endif
    {
3107
#ifndef DBUG_OFF
3108
      char buf[22];
3109
#endif
3110 3111 3112 3113 3114 3115 3116 3117
      DBUG_PRINT("info", ("update_pos error = %d", error));
      DBUG_PRINT("info", ("group %s %s",
                          llstr(rli->group_relay_log_pos, buf),
                          rli->group_relay_log_name));
      DBUG_PRINT("info", ("event %s %s",
                          llstr(rli->event_relay_log_pos, buf),
                          rli->event_relay_log_name));
    }
3118 3119 3120 3121 3122 3123 3124 3125 3126
    /*
      The update should not fail, so print an error message and
      return an error code.

      TODO: Replace this with a decent error message when merged
      with BUG#24954 (which adds several new error message).
    */
    if (error)
    {
3127
      char buf[22];
3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162
      rli->report(ERROR_LEVEL, ER_UNKNOWN_ERROR,
                  "It was not possible to update the positions"
                  " of the relay log information: the slave may"
                  " be in an inconsistent state."
                  " Stopped in %s position %s",
                  rli->group_relay_log_name,
                  llstr(rli->group_relay_log_pos, buf));
      DBUG_RETURN(2);
    }
  }

  DBUG_RETURN(exec_res ? 1 : 0);
}


/**
  Top-level function for executing the next event from the relay log.

  This function reads the event from the relay log, executes it, and
  advances the relay log position.  It also handles errors, etc.

  This function may fail to apply the event for the following reasons:

   - The position specfied by the UNTIL condition of the START SLAVE
     command is reached.

   - It was not possible to read the event from the log.

   - The slave is killed.

   - An error occurred when applying the event, and the event has been
     tried slave_trans_retries times.  If the event has been retried
     fewer times, 0 is returned.

   - init_master_info or init_relay_log_pos failed. (These are called
3163
     if a failure occurs when applying the event.)
3164 3165 3166 3167 3168 3169 3170

   - An error occurred when updating the binlog position.

  @retval 0 The event was applied.

  @retval 1 The event was not applied.
*/
3171
static int exec_relay_log_event(THD* thd, Relay_log_info* rli)
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3172
{
3173 3174
  DBUG_ENTER("exec_relay_log_event");

3175 3176
  /*
     We acquire this mutex since we need it for all operations except
3177
     event execution. But we will release it in places where we will
3178 3179
     wait for something for example inside of next_event().
   */
Marc Alff's avatar
Marc Alff committed
3180
  mysql_mutex_lock(&rli->data_lock);
3181

3182
  Log_event * ev = next_event(rli);
3183

3184
  DBUG_ASSERT(rli->sql_thd==thd);
3185

3186
  if (sql_slave_killed(thd,rli))
3187
  {
Marc Alff's avatar
Marc Alff committed
3188
    mysql_mutex_unlock(&rli->data_lock);
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3189
    delete ev;
3190
    DBUG_RETURN(1);
3191
  }
3192 3193
  if (ev)
  {
3194
    int exec_res;
3195

3196 3197 3198 3199
    /*
      This tests if the position of the beginning of the current event
      hits the UNTIL barrier.
    */
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3200 3201
    if ((rli->until_condition == Relay_log_info::UNTIL_MASTER_POS ||
         rli->until_condition == Relay_log_info::UNTIL_RELAY_POS) &&
3202
        rli->is_until_satisfied(thd, ev))
3203 3204 3205 3206 3207 3208 3209 3210 3211
    {
      char buf[22];
      sql_print_information("Slave SQL thread stopped because it reached its"
                            " UNTIL position %s", llstr(rli->until_pos(), buf));
      /*
        Setting abort_slave flag because we do not want additional message about
        error in query execution to be printed.
      */
      rli->abort_slave= 1;
Marc Alff's avatar
Marc Alff committed
3212
      mysql_mutex_unlock(&rli->data_lock);
3213
      delete ev;
3214
      DBUG_RETURN(1);
3215
    }
3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229

    { /**
         The following failure injecion works in cooperation with tests 
         setting @@global.debug= 'd,incomplete_group_in_relay_log'.
         Xid or Commit events are not executed to force the slave sql
         read hanging if the realy log does not have any more events.
      */
      DBUG_EXECUTE_IF("incomplete_group_in_relay_log",
                      if ((ev->get_type_code() == XID_EVENT) ||
                          ((ev->get_type_code() == QUERY_EVENT) &&
                           strcmp("COMMIT", ((Query_log_event *) ev)->query) == 0))
                      {
                        DBUG_ASSERT(thd->transaction.all.modified_non_trans_table);
                        rli->abort_slave= 1;
Marc Alff's avatar
Marc Alff committed
3230
                        mysql_mutex_unlock(&rli->data_lock);
3231 3232 3233 3234 3235 3236
                        delete ev;
                        rli->inc_event_relay_log_pos();
                        DBUG_RETURN(0);
                      };);
    }

3237
    exec_res= apply_event_and_update_pos(ev, thd, rli);
3238

3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268
    switch (ev->get_type_code()) {
      case FORMAT_DESCRIPTION_EVENT:
        /*
          Format_description_log_event should not be deleted because it
          will be used to read info about the relay log's format;
          it will be deleted when the SQL thread does not need it,
          i.e. when this thread terminates.
        */
        break;
      case ANNOTATE_ROWS_EVENT:
        /*
          Annotate_rows event should not be deleted because after it has
          been applied, thd->query points to the string inside this event.
          The thd->query will be used to generate new Annotate_rows event
          during applying the subsequent Rows events.
        */
        rli->set_annotate_event((Annotate_rows_log_event*) ev);
        break;
      case DELETE_ROWS_EVENT:
      case UPDATE_ROWS_EVENT:
      case WRITE_ROWS_EVENT:
        /*
          After the last Rows event has been applied, the saved Annotate_rows
          event (if any) is not needed anymore and can be deleted.
        */
        if (((Rows_log_event*)ev)->get_flags(Rows_log_event::STMT_END_F))
          rli->free_annotate_event();
        /* fall through */
      default:
        DBUG_PRINT("info", ("Deleting the event after it has been executed"));
Sergei Golubchik's avatar
Sergei Golubchik committed
3269 3270
        if (!rli->is_deferred_event(ev))
          delete ev;
3271
        break;
3272 3273
    }

3274

3275
    /*
3276 3277
      update_log_pos failed: this should not happen, so we don't
      retry.
3278
    */
3279 3280 3281
    if (exec_res == 2)
      DBUG_RETURN(1);

3282 3283
    if (slave_trans_retries)
    {
3284
      int temp_err;
Michael Widenius's avatar
Michael Widenius committed
3285
      LINT_INIT(temp_err);
3286
      if (exec_res && (temp_err= has_temporary_error(thd)))
3287 3288 3289 3290
      {
        const char *errmsg;
        /*
          We were in a transaction which has been rolled back because of a
unknown's avatar
unknown committed
3291 3292
          temporary error;
          let's seek back to BEGIN log event and retry it all again.
3293
	  Note, if lock wait timeout (innodb_lock_wait_timeout exceeded)
3294
	  there is no rollback since 5.0.13 (ref: manual).
3295 3296 3297 3298 3299 3300 3301 3302
          We have to not only seek but also
          a) init_master_info(), to seek back to hot relay log's start for later
          (for when we will come back to this hot log after re-processing the
          possibly existing old logs where BEGIN is: check_binlog_magic() will
          then need the cache to be at position 0 (see comments at beginning of
          init_master_info()).
          b) init_relay_log_pos(), because the BEGIN may be an older relay log.
        */
3303
        if (rli->trans_retries < slave_trans_retries)
3304 3305 3306 3307 3308 3309
        {
          if (init_master_info(rli->mi, 0, 0, 0, SLAVE_SQL))
            sql_print_error("Failed to initialize the master info structure");
          else if (init_relay_log_pos(rli,
                                      rli->group_relay_log_name,
                                      rli->group_relay_log_pos,
3310
                                      1, &errmsg, 1))
3311 3312 3313 3314 3315
            sql_print_error("Error initializing relay log position: %s",
                            errmsg);
          else
          {
            exec_res= 0;
3316
            rli->cleanup_context(thd, 1);
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3317
            /* chance for concurrent connection to get more locks */
3318 3319
            slave_sleep(thd, min(rli->trans_retries, MAX_SLAVE_RETRY_PAUSE),
                       sql_slave_killed, rli);
Marc Alff's avatar
Marc Alff committed
3320
            mysql_mutex_lock(&rli->data_lock); // because of SHOW STATUS
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3321
            rli->trans_retries++;
3322
            rli->retried_trans++;
3323
            statistic_increment(slave_retried_transactions, LOCK_status);
Marc Alff's avatar
Marc Alff committed
3324
            mysql_mutex_unlock(&rli->data_lock);
3325 3326
            DBUG_PRINT("info", ("Slave retries transaction "
                                "rli->trans_retries: %lu", rli->trans_retries));
unknown's avatar
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3327
          }
3328 3329 3330 3331 3332 3333 3334
        }
        else
          sql_print_error("Slave SQL thread retried transaction %lu time(s) "
                          "in vain, giving up. Consider raising the value of "
                          "the slave_transaction_retries variable.",
                          slave_trans_retries);
      }
3335
      else if ((exec_res && !temp_err) ||
3336 3337
               (opt_using_transactions &&
                rli->group_relay_log_pos == rli->event_relay_log_pos))
3338 3339
      {
        /*
3340 3341 3342
          Only reset the retry counter if the entire group succeeded
          or failed with a non-transient error.  On a successful
          event, the execution will proceed as usual; in the case of a
3343 3344 3345
          non-transient error, the slave will stop with an error.
         */
        rli->trans_retries= 0; // restart from fresh
unknown's avatar
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3346
        DBUG_PRINT("info", ("Resetting retry counter, rli->trans_retries: %lu",
3347
                            rli->trans_retries));
3348
      }
3349 3350
    }
    DBUG_RETURN(exec_res);
3351
  }
Marc Alff's avatar
Marc Alff committed
3352
  mysql_mutex_unlock(&rli->data_lock);
3353 3354
  rli->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_READ_FAILURE,
              ER(ER_SLAVE_RELAY_LOG_READ_FAILURE), "\
3355 3356 3357 3358 3359 3360 3361
Could not parse relay log event entry. The possible reasons are: the master's \
binary log is corrupted (you can check this by running 'mysqlbinlog' on the \
binary log), the slave's relay log is corrupted (you can check this by running \
'mysqlbinlog' on the relay log), a network problem, or a bug in the master's \
or slave's MySQL code. If you want to check the master's binary log or slave's \
relay log, you will be able to know their names by issuing 'SHOW SLAVE STATUS' \
on this slave.\
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3362
");
3363
  DBUG_RETURN(1);
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3364 3365
}

3366

3367
static bool check_io_slave_killed(THD *thd, Master_info *mi, const char *info)
3368 3369 3370
{
  if (io_slave_killed(thd, mi))
  {
3371
    if (info && global_system_variables.log_warnings)
3372
      sql_print_information("%s", info);
3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403
    return TRUE;
  }
  return FALSE;
}

/**
  @brief Try to reconnect slave IO thread.

  @details Terminates current connection to master, sleeps for
  @c mi->connect_retry msecs and initiates new connection with
  @c safe_reconnect(). Variable pointed by @c retry_count is increased -
  if it exceeds @c master_retry_count then connection is not re-established
  and function signals error.
  Unless @c suppres_warnings is TRUE, a warning is put in the server error log
  when reconnecting. The warning message and messages used to report errors
  are taken from @c messages array. In case @c master_retry_count is exceeded,
  no messages are added to the log.

  @param[in]     thd                 Thread context.
  @param[in]     mysql               MySQL connection.
  @param[in]     mi                  Master connection information.
  @param[in,out] retry_count         Number of attempts to reconnect.
  @param[in]     suppress_warnings   TRUE when a normal net read timeout 
                                     has caused to reconnecting.
  @param[in]     messages            Messages to print/log, see 
                                     reconnect_messages[] array.

  @retval        0                   OK.
  @retval        1                   There was an error.
*/

3404
static int try_to_reconnect(THD *thd, MYSQL *mysql, Master_info *mi,
3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417
                            uint *retry_count, bool suppress_warnings,
                            const char *messages[SLAVE_RECON_MSG_MAX])
{
  mi->slave_running= MYSQL_SLAVE_RUN_NOT_CONNECT;
  thd->proc_info= messages[SLAVE_RECON_MSG_WAIT];
#ifdef SIGNAL_WITH_VIO_CLOSE  
  thd->clear_active_vio();
#endif
  end_server(mysql);
  if ((*retry_count)++)
  {
    if (*retry_count > master_retry_count)
      return 1;                             // Don't retry forever
3418
    slave_sleep(thd, mi->connect_retry, io_slave_killed, mi);
3419 3420 3421 3422 3423 3424 3425
  }
  if (check_io_slave_killed(thd, mi, messages[SLAVE_RECON_MSG_KILLED_WAITING]))
    return 1;
  thd->proc_info = messages[SLAVE_RECON_MSG_AFTER];
  if (!suppress_warnings) 
  {
    char buf[256], llbuff[22];
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3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438
    String tmp;
    if (mi->using_gtid != Master_info::USE_GTID_NO)
    {
      tmp.append(STRING_WITH_LEN("; GTID position '"));
      mi->gtid_current_pos.append_to_string(&tmp);
      if (mi->events_queued_since_last_gtid == 0)
        tmp.append(STRING_WITH_LEN("'"));
      else
      {
        tmp.append(STRING_WITH_LEN("', GTID event skip "));
        tmp.append_ulonglong((ulonglong)mi->events_queued_since_last_gtid);
      }
    }
3439
    my_snprintf(buf, sizeof(buf), messages[SLAVE_RECON_MSG_FAILED], 
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3440 3441
                IO_RPL_LOG_NAME, llstr(mi->master_log_pos, llbuff),
                tmp.c_ptr_safe());
3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453
    /* 
      Raise a warining during registering on master/requesting dump.
      Log a message reading event.
    */
    if (messages[SLAVE_RECON_MSG_COMMAND][0])
    {
      mi->report(WARNING_LEVEL, ER_SLAVE_MASTER_COM_FAILURE,
                 ER(ER_SLAVE_MASTER_COM_FAILURE), 
                 messages[SLAVE_RECON_MSG_COMMAND], buf);
    }
    else
    {
3454
      sql_print_information("%s", buf);
3455 3456 3457 3458 3459
    }
  }
  if (safe_reconnect(thd, mysql, mi, 1) || io_slave_killed(thd, mi))
  {
    if (global_system_variables.log_warnings)
3460
      sql_print_information("%s", messages[SLAVE_RECON_MSG_KILLED_AFTER]);
3461 3462 3463 3464 3465 3466
    return 1;
  }
  return 0;
}


3467 3468 3469 3470 3471
/**
  Slave IO thread entry point.

  @param arg Pointer to Master_info struct that holds information for
  the IO thread.
3472

3473 3474
  @return Always 0.
*/
3475
pthread_handler_t handle_slave_io(void *arg)
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3476
{
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3477 3478
  THD *thd; // needs to be first for thread_stack
  MYSQL *mysql;
3479
  Master_info *mi = (Master_info*)arg;
3480
  Relay_log_info *rli= &mi->rli;
unknown's avatar
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3481 3482
  char llbuff[22];
  uint retry_count;
3483
  bool suppress_warnings;
3484
  int ret;
3485 3486 3487
#ifndef DBUG_OFF
  uint retry_count_reg= 0, retry_count_dump= 0, retry_count_event= 0;
#endif
unknown's avatar
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3488 3489
  // needs to call my_thread_init(), otherwise we get a coredump in DBUG_ stuff
  my_thread_init();
3490
  DBUG_ENTER("handle_slave_io");
unknown's avatar
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3491

3492
  DBUG_ASSERT(mi->inited);
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3493 3494 3495
  mysql= NULL ;
  retry_count= 0;

3496 3497
  thd= new THD; // note that contructor of THD uses DBUG_ !

Marc Alff's avatar
Marc Alff committed
3498
  mysql_mutex_lock(&mi->run_lock);
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3499 3500 3501
  /* Inform waiting threads that slave has started */
  mi->slave_run_id++;

3502
#ifndef DBUG_OFF
3503
  mi->events_till_disconnect = disconnect_slave_event_count;
3504 3505
#endif

3506
  THD_CHECK_SENTRY(thd);
3507
  mi->io_thd = thd;
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3508 3509

  pthread_detach_this_thread();
3510
  thd->thread_stack= (char*) &thd; // remember where our stack is
3511
  mi->clear_error();
3512
  if (init_slave_thread(thd, mi, SLAVE_THD_IO))
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3513
  {
Marc Alff's avatar
Marc Alff committed
3514
    mysql_cond_broadcast(&mi->start_cond);
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3515
    sql_print_error("Failed during slave I/O thread initialization");
3516
    goto err_during_init;
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3517
  }
Marc Alff's avatar
Marc Alff committed
3518
  mysql_mutex_lock(&LOCK_thread_count);
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3519
  threads.append(thd);
Marc Alff's avatar
Marc Alff committed
3520
  mysql_mutex_unlock(&LOCK_thread_count);
3521
  mi->slave_running = MYSQL_SLAVE_RUN_NOT_CONNECT;
3522
  mi->abort_slave = 0;
Marc Alff's avatar
Marc Alff committed
3523 3524
  mysql_mutex_unlock(&mi->run_lock);
  mysql_cond_broadcast(&mi->start_cond);
3525

3526
  DBUG_PRINT("master_info",("log_file_name: '%s'  position: %s",
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3527 3528
                            mi->master_log_name,
                            llstr(mi->master_log_pos,llbuff)));
3529

He Zhenxing's avatar
He Zhenxing committed
3530 3531 3532
  /* This must be called before run any binlog_relay_io hooks */
  my_pthread_setspecific_ptr(RPL_MASTER_INFO, mi);

3533 3534 3535 3536 3537 3538
  /* Load the set of seen GTIDs, if we did not already. */
  if (rpl_load_gtid_slave_state(thd))
  {
    mi->report(ERROR_LEVEL, thd->stmt_da->sql_errno(), 
                "Unable to load replication GTID slave state from mysql.%s: %s",
                rpl_gtid_slave_state_table_name.str, thd->stmt_da->message());
3539 3540 3541 3542 3543 3544 3545
    /*
      If we are using old-style replication, we can continue, even though we
      then will not be able to record the GTIDs we receive. But if using GTID,
      we must give up.
    */
    if (mi->using_gtid != Master_info::USE_GTID_NO || opt_gtid_strict_mode)
      goto err;
3546 3547 3548
  }


He Zhenxing's avatar
He Zhenxing committed
3549 3550 3551 3552 3553 3554 3555
  if (RUN_HOOK(binlog_relay_io, thread_start, (thd, mi)))
  {
    mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR,
               ER(ER_SLAVE_FATAL_ERROR), "Failed to run 'thread_start' hook");
    goto err;
  }

unknown's avatar
SCRUM  
unknown committed
3556
  if (!(mi->mysql = mysql = mysql_init(NULL)))
unknown's avatar
unknown committed
3557
  {
3558 3559
    mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR,
               ER(ER_SLAVE_FATAL_ERROR), "error in mysql_init()");
unknown's avatar
unknown committed
3560 3561
    goto err;
  }
3562

3563
  thd_proc_info(thd, "Connecting to master");
3564
  // we can get killed during safe_connect
3565
  if (!safe_connect(thd, mysql, mi))
3566
  {
unknown's avatar
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3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581
    if (mi->using_gtid == Master_info::USE_GTID_NO)
      sql_print_information("Slave I/O thread: connected to master '%s@%s:%d',"
                            "replication started in log '%s' at position %s",
                            mi->user, mi->host, mi->port,
                            IO_RPL_LOG_NAME,
                            llstr(mi->master_log_pos,llbuff));
    else
    {
      String tmp;
      mi->gtid_current_pos.to_string(&tmp);
      sql_print_information("Slave I/O thread: connected to master '%s@%s:%d',"
                            "replication starts at GTID position '%s'",
                            mi->user, mi->host, mi->port, tmp.c_ptr_safe());
    }

3582 3583 3584 3585 3586
  /*
    Adding MAX_LOG_EVENT_HEADER_LEN to the max_packet_size on the I/O
    thread, since a replication event can become this much larger than
    the corresponding packet (query) sent from client to master.
  */
3587
    thd->net.max_packet_size= slave_max_allowed_packet;
3588 3589
    mysql->net.max_packet_size= thd->net.max_packet_size+= MAX_LOG_EVENT_HEADER;
  }
3590
  else
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3591
  {
3592
    sql_print_information("Slave I/O thread killed while connecting to master");
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3593 3594
    goto err;
  }
3595

3596
connected:
3597

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3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616
  if (mi->using_gtid != Master_info::USE_GTID_NO)
  {
    /*
      When the IO thread (re)connects to the master using GTID, it will
      connect at the start of an event group. But the IO thread may have
      previously logged part of the following event group to the relay
      log.

      When the IO and SQL thread are started together, we erase any previous
      relay logs, but this is not possible/desirable while the SQL thread is
      running. To avoid duplicating partial event groups in the relay logs in
      this case, we remember the count of events in any partially logged event
      group before the reconnect, and then here at connect we set up a counter
      to skip the already-logged part of the group.
    */
    mi->gtid_reconnect_event_skip_count= mi->events_queued_since_last_gtid;
    mi->gtid_event_seen= false;
  }

3617
#ifdef ENABLED_DEBUG_SYNC
3618 3619 3620 3621 3622
    DBUG_EXECUTE_IF("dbug.before_get_running_status_yes",
                    {
                      const char act[]=
                        "now "
                        "wait_for signal.io_thread_let_running";
3623
                      DBUG_ASSERT(debug_sync_service);
3624 3625 3626
                      DBUG_ASSERT(!debug_sync_set_action(thd, 
                                                         STRING_WITH_LEN(act)));
                    };);
3627
#endif
3628

3629 3630
  // TODO: the assignment below should be under mutex (5.0)
  mi->slave_running= MYSQL_SLAVE_RUN_CONNECT;
3631
  thd->slave_net = &mysql->net;
3632
  thd_proc_info(thd, "Checking master version");
3633 3634 3635
  ret= get_master_version_and_clock(mysql, mi);
  if (ret == 1)
    /* Fatal error */
3636
    goto err;
3637

3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649
  if (ret == 2) 
  { 
    if (check_io_slave_killed(mi->io_thd, mi, "Slave I/O thread killed"
                              "while calling get_master_version_and_clock(...)"))
      goto err;
    suppress_warnings= FALSE;
    /* Try to reconnect because the error was caused by a transient network problem */
    if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
                             reconnect_messages[SLAVE_RECON_ACT_REG]))
      goto err;
    goto connected;
  } 
3650 3651

  if (mi->rli.relay_log.description_event_for_queue->binlog_version > 1)
3652
  {
unknown's avatar
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3653 3654 3655
    /*
      Register ourselves with the master.
    */
3656
    thd_proc_info(thd, "Registering slave on master");
3657
    if (register_slave_on_master(mysql, mi, &suppress_warnings))
3658
    {
3659 3660 3661 3662 3663 3664 3665 3666 3667
      if (!check_io_slave_killed(thd, mi, "Slave I/O thread killed "
                                "while registering slave on master"))
      {
        sql_print_error("Slave I/O thread couldn't register on master");
        if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
                             reconnect_messages[SLAVE_RECON_ACT_REG]))
          goto err;
      }
      else
3668 3669
        goto err;
      goto connected;
3670
    }
3671 3672 3673 3674 3675 3676 3677 3678 3679 3680
    DBUG_EXECUTE_IF("FORCE_SLAVE_TO_RECONNECT_REG", 
      if (!retry_count_reg)
      {
        retry_count_reg++;
        sql_print_information("Forcing to reconnect slave I/O thread");
        if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
                             reconnect_messages[SLAVE_RECON_ACT_REG]))
          goto err;
        goto connected;
      });
3681
  }
3682

3683
  DBUG_PRINT("info",("Starting reading binary log from master"));
3684
  while (!io_slave_killed(thd,mi))
unknown's avatar
unknown committed
3685
  {
3686
    thd_proc_info(thd, "Requesting binlog dump");
He Zhenxing's avatar
He Zhenxing committed
3687
    if (request_dump(thd, mysql, mi, &suppress_warnings))
unknown's avatar
unknown committed
3688 3689
    {
      sql_print_error("Failed on request_dump()");
3690 3691 3692 3693
      if (check_io_slave_killed(thd, mi, "Slave I/O thread killed while \
requesting master dump") ||
          try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
                           reconnect_messages[SLAVE_RECON_ACT_DUMP]))
unknown's avatar
unknown committed
3694
        goto err;
unknown's avatar
unknown committed
3695 3696
      goto connected;
    }
3697 3698 3699 3700 3701 3702 3703 3704 3705 3706
    DBUG_EXECUTE_IF("FORCE_SLAVE_TO_RECONNECT_DUMP", 
      if (!retry_count_dump)
      {
        retry_count_dump++;
        sql_print_information("Forcing to reconnect slave I/O thread");
        if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
                             reconnect_messages[SLAVE_RECON_ACT_DUMP]))
          goto err;
        goto connected;
      });
He Zhenxing's avatar
He Zhenxing committed
3707
    const char *event_buf;
unknown's avatar
unknown committed
3708

3709
    DBUG_ASSERT(mi->last_error().number == 0);
3710
    while (!io_slave_killed(thd,mi))
unknown's avatar
unknown committed
3711
    {
3712
      ulong event_len;
3713
      /*
3714
         We say "waiting" because read_event() will wait if there's nothing to
3715 3716 3717
         read. But if there's something to read, it will not wait. The
         important thing is to not confuse users by saying "reading" whereas
         we're in fact receiving nothing.
3718
      */
3719
      thd_proc_info(thd, "Waiting for master to send event");
3720
      event_len= read_event(mysql, mi, &suppress_warnings);
3721 3722
      if (check_io_slave_killed(thd, mi, "Slave I/O thread killed while \
reading event"))
unknown's avatar
unknown committed
3723
        goto err;
3724 3725 3726 3727 3728 3729 3730 3731 3732 3733
      DBUG_EXECUTE_IF("FORCE_SLAVE_TO_RECONNECT_EVENT",
        if (!retry_count_event)
        {
          retry_count_event++;
          sql_print_information("Forcing to reconnect slave I/O thread");
          if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
                               reconnect_messages[SLAVE_RECON_ACT_EVENT]))
            goto err;
          goto connected;
        });
3734

unknown's avatar
unknown committed
3735 3736
      if (event_len == packet_error)
      {
unknown's avatar
unknown committed
3737
        uint mysql_error_number= mysql_errno(mysql);
3738 3739
        switch (mysql_error_number) {
        case CR_NET_PACKET_TOO_LARGE:
unknown's avatar
unknown committed
3740
          sql_print_error("\
3741
Log entry on master is longer than slave_max_allowed_packet (%lu) on \
3742
slave. If the entry is correct, restart the server with a higher value of \
3743 3744
slave_max_allowed_packet",
                         slave_max_allowed_packet);
3745
          mi->report(ERROR_LEVEL, ER_NET_PACKET_TOO_LARGE,
3746
                     "%s", "Got a packet bigger than 'slave_max_allowed_packet' bytes");
unknown's avatar
unknown committed
3747
          goto err;
3748
        case ER_MASTER_FATAL_ERROR_READING_BINLOG:
3749 3750 3751
          mi->report(ERROR_LEVEL, ER_MASTER_FATAL_ERROR_READING_BINLOG,
                     ER(ER_MASTER_FATAL_ERROR_READING_BINLOG),
                     mysql_error_number, mysql_error(mysql));
unknown's avatar
unknown committed
3752
          goto err;
3753
        case ER_OUT_OF_RESOURCES:
3754 3755
          sql_print_error("\
Stopping slave I/O thread due to out-of-memory error from master");
3756
          mi->report(ERROR_LEVEL, ER_OUT_OF_RESOURCES,
3757
                     "%s", ER(ER_OUT_OF_RESOURCES));
unknown's avatar
unknown committed
3758 3759
          goto err;
        }
3760 3761
        if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
                             reconnect_messages[SLAVE_RECON_ACT_EVENT]))
unknown's avatar
unknown committed
3762 3763
          goto err;
        goto connected;
unknown's avatar
unknown committed
3764
      } // if (event_len == packet_error)
3765

unknown's avatar
unknown committed
3766
      retry_count=0;                    // ok event, reset retry counter
3767
      thd_proc_info(thd, "Queueing master event to the relay log");
He Zhenxing's avatar
He Zhenxing committed
3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782
      event_buf= (const char*)mysql->net.read_pos + 1;
      if (RUN_HOOK(binlog_relay_io, after_read_event,
                   (thd, mi,(const char*)mysql->net.read_pos + 1,
                    event_len, &event_buf, &event_len)))
      {
        mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR,
                   ER(ER_SLAVE_FATAL_ERROR),
                   "Failed to run 'after_read_event' hook");
        goto err;
      }

      /* XXX: 'synced' should be updated by queue_event to indicate
         whether event has been synced to disk */
      bool synced= 0;
      if (queue_event(mi, event_buf, event_len))
unknown's avatar
unknown committed
3783
      {
3784 3785 3786
        mi->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_WRITE_FAILURE,
                   ER(ER_SLAVE_RELAY_LOG_WRITE_FAILURE),
                   "could not queue event from master");
unknown's avatar
unknown committed
3787
        goto err;
unknown's avatar
unknown committed
3788
      }
He Zhenxing's avatar
He Zhenxing committed
3789 3790 3791 3792 3793 3794 3795 3796 3797 3798

      if (RUN_HOOK(binlog_relay_io, after_queue_event,
                   (thd, mi, event_buf, event_len, synced)))
      {
        mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR,
                   ER(ER_SLAVE_FATAL_ERROR),
                   "Failed to run 'after_queue_event' hook");
        goto err;
      }

3799
      if (flush_master_info(mi, TRUE, TRUE))
3800 3801 3802 3803
      {
        sql_print_error("Failed to flush master info file");
        goto err;
      }
3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815
      /*
        See if the relay logs take too much space.
        We don't lock mi->rli.log_space_lock here; this dirty read saves time
        and does not introduce any problem:
        - if mi->rli.ignore_log_space_limit is 1 but becomes 0 just after (so
        the clean value is 0), then we are reading only one more event as we
        should, and we'll block only at the next event. No big deal.
        - if mi->rli.ignore_log_space_limit is 0 but becomes 1 just after (so
        the clean value is 1), then we are going into wait_for_relay_log_space()
        for no reason, but this function will do a clean read, notice the clean
        value and exit immediately.
      */
3816 3817 3818 3819 3820
#ifndef DBUG_OFF
      {
        char llbuf1[22], llbuf2[22];
        DBUG_PRINT("info", ("log_space_limit=%s log_space_total=%s \
ignore_log_space_limit=%d",
3821 3822
                            llstr(rli->log_space_limit,llbuf1),
                            llstr(rli->log_space_total,llbuf2),
unknown's avatar
unknown committed
3823
                            (int) rli->ignore_log_space_limit));
3824 3825 3826
      }
#endif

3827
      if (rli->log_space_limit && rli->log_space_limit <
unknown's avatar
unknown committed
3828
          rli->log_space_total &&
3829
          !rli->ignore_log_space_limit)
unknown's avatar
unknown committed
3830 3831 3832
        if (wait_for_relay_log_space(rli))
        {
          sql_print_error("Slave I/O thread aborted while waiting for relay \
unknown's avatar
unknown committed
3833
log space");
unknown's avatar
unknown committed
3834 3835 3836
          goto err;
        }
    }
3837
  }
unknown's avatar
unknown committed
3838

unknown's avatar
unknown committed
3839
  // error = 0;
unknown's avatar
unknown committed
3840
err:
3841
  // print the current replication position
unknown's avatar
unknown committed
3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854
  if (mi->using_gtid == Master_info::USE_GTID_NO)
    sql_print_information("Slave I/O thread exiting, read up to log '%s', "
                          "position %s",
                          IO_RPL_LOG_NAME, llstr(mi->master_log_pos,llbuff));
  else
  {
    String tmp;
    mi->gtid_current_pos.to_string(&tmp);
    sql_print_information("Slave I/O thread exiting, read up to log '%s', "
                          "position %s; GTID position %s",
                          IO_RPL_LOG_NAME, llstr(mi->master_log_pos,llbuff),
                          tmp.c_ptr_safe());
  }
He Zhenxing's avatar
He Zhenxing committed
3855
  RUN_HOOK(binlog_relay_io, thread_stop, (thd, mi));
3856
  thd->reset_query();
unknown's avatar
unknown committed
3857
  thd->reset_db(NULL, 0);
unknown's avatar
unknown committed
3858 3859
  if (mysql)
  {
3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870
    /*
      Here we need to clear the active VIO before closing the
      connection with the master.  The reason is that THD::awake()
      might be called from terminate_slave_thread() because somebody
      issued a STOP SLAVE.  If that happends, the close_active_vio()
      can be called in the middle of closing the VIO associated with
      the 'mysql' object, causing a crash.
    */
#ifdef SIGNAL_WITH_VIO_CLOSE
    thd->clear_active_vio();
#endif
unknown's avatar
SCRUM  
unknown committed
3871
    mysql_close(mysql);
unknown's avatar
unknown committed
3872 3873
    mi->mysql=0;
  }
3874
  write_ignored_events_info_to_relay_log(thd, mi);
3875
  thd_proc_info(thd, "Waiting for slave mutex on exit");
Marc Alff's avatar
Marc Alff committed
3876
  mysql_mutex_lock(&mi->run_lock);
3877

3878
err_during_init:
3879 3880 3881
  /* Forget the relay log's format */
  delete mi->rli.relay_log.description_event_for_queue;
  mi->rli.relay_log.description_event_for_queue= 0;
3882
  // TODO: make rpl_status part of Master_info
3883
  change_rpl_status(RPL_ACTIVE_SLAVE,RPL_IDLE_SLAVE);
Marc Alff's avatar
Marc Alff committed
3884
  mysql_mutex_lock(&LOCK_thread_count);
3885
  THD_CHECK_SENTRY(thd);
unknown's avatar
unknown committed
3886
  delete thd;
Marc Alff's avatar
Marc Alff committed
3887
  mysql_mutex_unlock(&LOCK_thread_count);
unknown's avatar
unknown committed
3888
  mi->abort_slave= 0;
3889
  mi->slave_running= MYSQL_SLAVE_NOT_RUN;
unknown's avatar
unknown committed
3890
  mi->io_thd= 0;
3891 3892 3893 3894 3895
  /*
    Note: the order of the two following calls (first broadcast, then unlock)
    is important. Otherwise a killer_thread can execute between the calls and
    delete the mi structure leading to a crash! (see BUG#25306 for details)
   */ 
Marc Alff's avatar
Marc Alff committed
3896
  mysql_cond_broadcast(&mi->stop_cond);       // tell the world we are done
3897
  DBUG_EXECUTE_IF("simulate_slave_delay_at_terminate_bug38694", sleep(5););
Marc Alff's avatar
Marc Alff committed
3898
  mysql_mutex_unlock(&mi->run_lock);
3899 3900

  DBUG_LEAVE;                                   // Must match DBUG_ENTER()
3901
  my_thread_end();
unknown's avatar
unknown committed
3902
  pthread_exit(0);
3903
  return 0;                                     // Avoid compiler warnings
unknown's avatar
unknown committed
3904 3905
}

3906 3907 3908
/*
  Check the temporary directory used by commands like
  LOAD DATA INFILE.
3909 3910 3911 3912

  As the directory never changes during a mysqld run, we only
  test this once and cache the result. This also resolve a race condition
  when this can be run by multiple threads at the same time.
3913
 */
3914 3915 3916 3917

static bool check_temp_dir_run= 0;
static int check_temp_dir_result= 0;

3918
static 
3919
int check_temp_dir(char* tmp_file)
3920
{
3921 3922
  File fd;
  int result= 1;                                // Assume failure
3923
  MY_DIR *dirp;
3924 3925
  char tmp_dir[FN_REFLEN];
  size_t tmp_dir_size;
3926 3927
  DBUG_ENTER("check_temp_dir");

3928 3929 3930 3931 3932 3933 3934 3935
  mysql_mutex_lock(&LOCK_thread_count);
  if (check_temp_dir_run)
  {
    result= check_temp_dir_result;
    goto end;
  }
  check_temp_dir_run= 1;

3936 3937 3938 3939 3940
  /*
    Get the directory from the temporary file.
  */
  dirname_part(tmp_dir, tmp_file, &tmp_dir_size);

3941 3942 3943 3944
  /*
    Check if the directory exists.
   */
  if (!(dirp=my_dir(tmp_dir,MYF(MY_WME))))
3945
    goto end;
3946 3947 3948
  my_dirend(dirp);

  /*
3949 3950
    Check permissions to create a file. We use O_TRUNC to ensure that
    things works even if we happen to have and old file laying around.
3951
   */
Marc Alff's avatar
Marc Alff committed
3952 3953
  if ((fd= mysql_file_create(key_file_misc,
                             tmp_file, CREATE_MODE,
3954
                             O_WRONLY | O_BINARY | O_TRUNC | O_NOFOLLOW,
Marc Alff's avatar
Marc Alff committed
3955
                             MYF(MY_WME))) < 0)
3956
    goto end;
3957

3958
  result= 0;                                    // Directory name ok
3959 3960 3961
  /*
    Clean up.
   */
Marc Alff's avatar
Marc Alff committed
3962 3963
  mysql_file_close(fd, MYF(0));
  mysql_file_delete(key_file_misc, tmp_file, MYF(0));
3964

3965 3966 3967 3968
end:
  check_temp_dir_result= result;
  mysql_mutex_unlock(&LOCK_thread_count);
  DBUG_RETURN(result);
3969
}
unknown's avatar
unknown committed
3970

3971

3972 3973 3974 3975 3976
/**
  Slave SQL thread entry point.

  @param arg Pointer to Relay_log_info object that holds information
  for the SQL thread.
unknown's avatar
unknown committed
3977

3978 3979
  @return Always 0.
*/
3980
pthread_handler_t handle_slave_sql(void *arg)
3981
{
unknown's avatar
unknown committed
3982
  THD *thd;                     /* needs to be first for thread_stack */
3983
  char llbuff[22],llbuff1[22];
3984 3985
  char saved_log_name[FN_REFLEN];
  char saved_master_log_name[FN_REFLEN];
3986 3987
  my_off_t UNINIT_VAR(saved_log_pos);
  my_off_t UNINIT_VAR(saved_master_log_pos);
3988
  my_off_t saved_skip= 0;
3989 3990
  Master_info *mi= ((Master_info*)arg);
  Relay_log_info* rli = &mi->rli;
unknown's avatar
unknown committed
3991 3992 3993 3994
  const char *errmsg;

  // needs to call my_thread_init(), otherwise we get a coredump in DBUG_ stuff
  my_thread_init();
3995
  DBUG_ENTER("handle_slave_sql");
unknown's avatar
unknown committed
3996

Michael Widenius's avatar
Michael Widenius committed
3997 3998
  LINT_INIT(saved_master_log_pos);
  LINT_INIT(saved_log_pos);
3999 4000 4001

  thd = new THD; // note that contructor of THD uses DBUG_ !
  thd->thread_stack = (char*)&thd; // remember where our stack is
4002
  thd->rpl_filter = mi->rpl_filter;
4003

4004
  DBUG_ASSERT(rli->inited);
4005
  DBUG_ASSERT(rli->mi == mi);
Marc Alff's avatar
Marc Alff committed
4006
  mysql_mutex_lock(&rli->run_lock);
4007
  DBUG_ASSERT(!rli->slave_running);
unknown's avatar
unknown committed
4008
  errmsg= 0;
unknown's avatar
unknown committed
4009
#ifndef DBUG_OFF
4010
  rli->events_till_abort = abort_slave_event_count;
unknown's avatar
unknown committed
4011
#endif
4012

4013
  rli->sql_thd= thd;
4014
  
unknown's avatar
unknown committed
4015 4016
  /* Inform waiting threads that slave has started */
  rli->slave_run_id++;
4017
  rli->slave_running= MYSQL_SLAVE_RUN_NOT_CONNECT;
unknown's avatar
unknown committed
4018

4019
  pthread_detach_this_thread();
4020
  if (init_slave_thread(thd, mi, SLAVE_THD_SQL))
unknown's avatar
unknown committed
4021 4022 4023 4024 4025
  {
    /*
      TODO: this is currently broken - slave start and change master
      will be stuck if we fail here
    */
Marc Alff's avatar
Marc Alff committed
4026
    mysql_cond_broadcast(&rli->start_cond);
4027 4028
    rli->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, 
                "Failed during slave thread initialization");
4029
    goto err_during_init;
unknown's avatar
unknown committed
4030
  }
4031
  thd->init_for_queries();
4032
  thd->rli_slave= rli;
4033
  if ((rli->deferred_events_collecting= mi->rpl_filter->is_on()))
4034 4035 4036 4037
  {
    rli->deferred_events= new Deferred_log_events(rli);
  }

4038
  thd->temporary_tables = rli->save_temporary_tables; // restore temp tables
4039
  set_thd_in_use_temporary_tables(rli);   // (re)set sql_thd in use for saved temp tables
4040
  /*
4041
    binlog_annotate_row_events must be TRUE only after an Annotate_rows event
4042 4043 4044
    has been recieved and only till the last corresponding rbr event has been
    applied. In all other cases it must be FALSE.
  */
4045
  thd->variables.binlog_annotate_row_events= 0;
Marc Alff's avatar
Marc Alff committed
4046
  mysql_mutex_lock(&LOCK_thread_count);
4047
  threads.append(thd);
Marc Alff's avatar
Marc Alff committed
4048
  mysql_mutex_unlock(&LOCK_thread_count);
4049 4050 4051 4052 4053 4054 4055 4056
  /*
    We are going to set slave_running to 1. Assuming slave I/O thread is
    alive and connected, this is going to make Seconds_Behind_Master be 0
    i.e. "caught up". Even if we're just at start of thread. Well it's ok, at
    the moment we start we can think we are caught up, and the next second we
    start receiving data so we realize we are not caught up and
    Seconds_Behind_Master grows. No big deal.
  */
4057
  rli->abort_slave = 0;
Marc Alff's avatar
Marc Alff committed
4058 4059
  mysql_mutex_unlock(&rli->run_lock);
  mysql_cond_broadcast(&rli->start_cond);
4060

unknown's avatar
unknown committed
4061 4062 4063
  /*
    Reset errors for a clean start (otherwise, if the master is idle, the SQL
    thread may execute no Query_log_event, so the error will remain even
unknown's avatar
unknown committed
4064
    though there's no problem anymore). Do not reset the master timestamp
4065 4066 4067 4068
    (imagine the slave has caught everything, the STOP SLAVE and START SLAVE:
    as we are not sure that we are going to receive a query, we want to
    remember the last master timestamp (to say how many seconds behind we are
    now.
unknown's avatar
unknown committed
4069
    But the master timestamp is reset by RESET SLAVE & CHANGE MASTER.
unknown's avatar
unknown committed
4070
  */
4071
  rli->clear_error();
4072 4073

  //tell the I/O thread to take relay_log_space_limit into account from now on
Marc Alff's avatar
Marc Alff committed
4074
  mysql_mutex_lock(&rli->log_space_lock);
4075
  rli->ignore_log_space_limit= 0;
Marc Alff's avatar
Marc Alff committed
4076
  mysql_mutex_unlock(&rli->log_space_lock);
4077
  rli->trans_retries= 0; // start from "no error"
unknown's avatar
unknown committed
4078
  DBUG_PRINT("info", ("rli->trans_retries: %lu", rli->trans_retries));
4079

4080
  if (init_relay_log_pos(rli,
unknown's avatar
unknown committed
4081 4082 4083
                         rli->group_relay_log_name,
                         rli->group_relay_log_pos,
                         1 /*need data lock*/, &errmsg,
4084
                         1 /*look for a description_event*/))
4085 4086 4087
  { 
    rli->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, 
                "Error initializing relay log position: %s", errmsg);
4088 4089
    goto err;
  }
4090
  THD_CHECK_SENTRY(thd);
4091 4092 4093 4094
#ifndef DBUG_OFF
  {
    char llbuf1[22], llbuf2[22];
    DBUG_PRINT("info", ("my_b_tell(rli->cur_log)=%s rli->event_relay_log_pos=%s",
unknown's avatar
unknown committed
4095
                        llstr(my_b_tell(rli->cur_log),llbuf1),
4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114
                        llstr(rli->event_relay_log_pos,llbuf2)));
    DBUG_ASSERT(rli->event_relay_log_pos >= BIN_LOG_HEADER_SIZE);
    /*
      Wonder if this is correct. I (Guilhem) wonder if my_b_tell() returns the
      correct position when it's called just after my_b_seek() (the questionable
      stuff is those "seek is done on next read" comments in the my_b_seek()
      source code).
      The crude reality is that this assertion randomly fails whereas
      replication seems to work fine. And there is no easy explanation why it
      fails (as we my_b_seek(rli->event_relay_log_pos) at the very end of
      init_relay_log_pos() called above). Maybe the assertion would be
      meaningful if we held rli->data_lock between the my_b_seek() and the
      DBUG_ASSERT().
    */
#ifdef SHOULD_BE_CHECKED
    DBUG_ASSERT(my_b_tell(rli->cur_log) == rli->event_relay_log_pos);
#endif
  }
#endif
4115
  DBUG_ASSERT(rli->sql_thd == thd);
4116 4117

  DBUG_PRINT("master_info",("log_file_name: %s  position: %s",
unknown's avatar
unknown committed
4118 4119
                            rli->group_master_log_name,
                            llstr(rli->group_master_log_pos,llbuff)));
4120
  if (global_system_variables.log_warnings)
unknown's avatar
unknown committed
4121 4122 4123 4124 4125 4126 4127 4128 4129
  {
    String tmp;
    if (mi->using_gtid != Master_info::USE_GTID_NO)
    {
      tmp.append(STRING_WITH_LEN("; GTID position '"));
      rpl_append_gtid_state(&tmp,
                            mi->using_gtid==Master_info::USE_GTID_CURRENT_POS);
      tmp.append(STRING_WITH_LEN("'"));
    }
4130
    sql_print_information("Slave SQL thread initialized, starting replication in \
unknown's avatar
unknown committed
4131
log '%s' at position %s, relay log '%s' position: %s%s", RPL_LOG_NAME,
unknown's avatar
unknown committed
4132
                    llstr(rli->group_master_log_pos,llbuff),rli->group_relay_log_name,
unknown's avatar
unknown committed
4133 4134
                    llstr(rli->group_relay_log_pos,llbuff1), tmp.c_ptr_safe());
  }
4135

4136
  if (check_temp_dir(rli->slave_patternload_file))
4137
  {
Marc Alff's avatar
Marc Alff committed
4138
    rli->report(ERROR_LEVEL, thd->stmt_da->sql_errno(), 
4139
                "Unable to use slave's temporary directory %s - %s", 
Marc Alff's avatar
Marc Alff committed
4140
                slave_load_tmpdir, thd->stmt_da->message());
4141 4142 4143
    goto err;
  }

4144 4145 4146 4147 4148 4149
  /* Load the set of seen GTIDs, if we did not already. */
  if (rpl_load_gtid_slave_state(thd))
  {
    rli->report(ERROR_LEVEL, thd->stmt_da->sql_errno(), 
                "Unable to load replication GTID slave state from mysql.%s: %s",
                rpl_gtid_slave_state_table_name.str, thd->stmt_da->message());
4150 4151 4152 4153 4154 4155 4156
    /*
      If we are using old-style replication, we can continue, even though we
      then will not be able to record the GTIDs we receive. But if using GTID,
      we must give up.
    */
    if (mi->using_gtid != Master_info::USE_GTID_NO || opt_gtid_strict_mode)
      goto err;
4157 4158
  }

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4159
  /* execute init_slave variable */
4160
  if (opt_init_slave.length)
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4161
  {
4162
    execute_init_command(thd, &opt_init_slave, &LOCK_sys_init_slave);
4163
    if (thd->is_slave_error)
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4164
    {
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Marc Alff committed
4165
      rli->report(ERROR_LEVEL, thd->stmt_da->sql_errno(),
4166
                  "Slave SQL thread aborted. Can't execute init_slave query");
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      goto err;
    }
  }

4171 4172 4173 4174
  /*
    First check until condition - probably there is nothing to execute. We
    do not want to wait for next event in this case.
  */
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4175
  mysql_mutex_lock(&rli->data_lock);
4176 4177
  if (rli->slave_skip_counter)
  {
4178 4179
    strmake_buf(saved_log_name, rli->group_relay_log_name);
    strmake_buf(saved_master_log_name, rli->group_master_log_name);
4180 4181 4182 4183
    saved_log_pos= rli->group_relay_log_pos;
    saved_master_log_pos= rli->group_master_log_pos;
    saved_skip= rli->slave_skip_counter;
  }
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  if ((rli->until_condition == Relay_log_info::UNTIL_MASTER_POS ||
       rli->until_condition == Relay_log_info::UNTIL_RELAY_POS) &&
4186
      rli->is_until_satisfied(thd, NULL))
4187 4188 4189 4190
  {
    char buf[22];
    sql_print_information("Slave SQL thread stopped because it reached its"
                          " UNTIL position %s", llstr(rli->until_pos(), buf));
Marc Alff's avatar
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4191
    mysql_mutex_unlock(&rli->data_lock);
4192 4193
    goto err;
  }
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4194
  mysql_mutex_unlock(&rli->data_lock);
4195

4196 4197
  /* Read queries from the IO/THREAD until this thread is killed */

4198
  while (!sql_slave_killed(thd,rli))
4199
  {
4200
    thd_proc_info(thd, "Reading event from the relay log");
4201
    DBUG_ASSERT(rli->sql_thd == thd);
4202
    THD_CHECK_SENTRY(thd);
4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217

    if (saved_skip && rli->slave_skip_counter == 0)
    {
      sql_print_information("'SQL_SLAVE_SKIP_COUNTER=%ld' executed at "
        "relay_log_file='%s', relay_log_pos='%ld', master_log_name='%s', "
        "master_log_pos='%ld' and new position at "
        "relay_log_file='%s', relay_log_pos='%ld', master_log_name='%s', "
        "master_log_pos='%ld' ",
        (ulong) saved_skip, saved_log_name, (ulong) saved_log_pos,
        saved_master_log_name, (ulong) saved_master_log_pos,
        rli->group_relay_log_name, (ulong) rli->group_relay_log_pos,
        rli->group_master_log_name, (ulong) rli->group_master_log_pos);
      saved_skip= 0;
    }
    
4218 4219
    if (exec_relay_log_event(thd,rli))
    {
4220
      DBUG_PRINT("info", ("exec_relay_log_event() failed"));
4221
      // do not scare the user if SQL thread was simply killed or stopped
4222
      if (!sql_slave_killed(thd,rli))
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4223 4224
      {
        /*
4225 4226 4227
          retrieve as much info as possible from the thd and, error
          codes and warnings and print this to the error log as to
          allow the user to locate the error
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4228
        */
4229
        uint32 const last_errno= rli->last_error().number;
4230

4231
        if (thd->is_error())
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4232
        {
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4233
          char const *const errmsg= thd->stmt_da->message();
4234 4235

          DBUG_PRINT("info",
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4236 4237
                     ("thd->stmt_da->sql_errno()=%d; rli->last_error.number=%d",
                      thd->stmt_da->sql_errno(), last_errno));
4238
          if (last_errno == 0)
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4239
          {
4240 4241 4242 4243
            /*
 	      This function is reporting an error which was not reported
 	      while executing exec_relay_log_event().
 	    */ 
4244
            rli->report(ERROR_LEVEL, thd->stmt_da->sql_errno(), "%s", errmsg);
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4245
          }
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Marc Alff committed
4246
          else if (last_errno != thd->stmt_da->sql_errno())
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4247
          {
4248 4249 4250 4251 4252 4253
            /*
             * An error was reported while executing exec_relay_log_event()
             * however the error code differs from what is in the thread.
             * This function prints out more information to help finding
             * what caused the problem.
             */  
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4254
            sql_print_error("Slave (additional info): %s Error_code: %d",
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4255
                            errmsg, thd->stmt_da->sql_errno());
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4256 4257 4258 4259
          }
        }

        /* Print any warnings issued */
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Marc Alff committed
4260
        List_iterator_fast<MYSQL_ERROR> it(thd->warning_info->warn_list());
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4261
        MYSQL_ERROR *err;
4262 4263 4264 4265 4266
        /*
          Added controlled slave thread cancel for replication
          of user-defined variables.
        */
        bool udf_error = false;
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4267
        while ((err= it++))
4268
        {
Marc Alff's avatar
Marc Alff committed
4269
          if (err->get_sql_errno() == ER_CANT_OPEN_LIBRARY)
4270
            udf_error = true;
Marc Alff's avatar
Marc Alff committed
4271
          sql_print_warning("Slave: %s Error_code: %d", err->get_message_text(), err->get_sql_errno());
4272 4273
        }
        if (udf_error)
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4274 4275 4276 4277 4278 4279 4280 4281
        {
          String tmp;
          if (mi->using_gtid != Master_info::USE_GTID_NO)
          {
            tmp.append(STRING_WITH_LEN("; GTID position '"));
            rpl_append_gtid_state(&tmp, false);
            tmp.append(STRING_WITH_LEN("'"));
          }
4282 4283 4284
          sql_print_error("Error loading user-defined library, slave SQL "
            "thread aborted. Install the missing library, and restart the "
            "slave SQL thread with \"SLAVE START\". We stopped at log '%s' "
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4285 4286 4287
            "position %s%s", RPL_LOG_NAME, llstr(rli->group_master_log_pos,
            llbuff), tmp.c_ptr_safe());
        }
4288
        else
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4289 4290 4291 4292 4293 4294 4295 4296
        {
          String tmp;
          if (mi->using_gtid != Master_info::USE_GTID_NO)
          {
            tmp.append(STRING_WITH_LEN("; GTID position '"));
            rpl_append_gtid_state(&tmp, false);
            tmp.append(STRING_WITH_LEN("'"));
          }
4297
          sql_print_error("\
4298
Error running query, slave SQL thread aborted. Fix the problem, and restart \
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4299
the slave SQL thread with \"SLAVE START\". We stopped at log \
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4300 4301 4302
'%s' position %s%s", RPL_LOG_NAME, llstr(rli->group_master_log_pos, llbuff),
                          tmp.c_ptr_safe());
        }
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4303
      }
4304 4305
      goto err;
    }
4306
    rli->executed_entries++;
4307
  }
4308

4309
  /* Thread stopped. Print the current replication position to the log */
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4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323
  {
    String tmp;
    if (mi->using_gtid != Master_info::USE_GTID_NO)
    {
      tmp.append(STRING_WITH_LEN("; GTID position '"));
      rpl_append_gtid_state(&tmp, false);
      tmp.append(STRING_WITH_LEN("'"));
    }
    sql_print_information("Slave SQL thread exiting, replication stopped in "
                          "log '%s' at position %s%s",
                          RPL_LOG_NAME,
                          llstr(rli->group_master_log_pos,llbuff),
                          tmp.c_ptr_safe());
  }
4324 4325

 err:
4326 4327 4328 4329 4330 4331 4332

  /*
    Some events set some playgrounds, which won't be cleared because thread
    stops. Stopping of this thread may not be known to these events ("stop"
    request is detected only by the present function, not by events), so we
    must "proactively" clear playgrounds:
  */
4333
  thd->clear_error();
4334
  rli->cleanup_context(thd, 1);
4335 4336 4337 4338 4339
  /*
    Some extra safety, which should not been needed (normally, event deletion
    should already have done these assignments (each event which sets these
    variables is supposed to set them to 0 before terminating)).
  */
4340
  thd->catalog= 0;
4341
  thd->reset_query();
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4342
  thd->reset_db(NULL, 0);
4343
  thd_proc_info(thd, "Waiting for slave mutex on exit");
Marc Alff's avatar
Marc Alff committed
4344
  mysql_mutex_lock(&rli->run_lock);
4345
err_during_init:
4346
  /* We need data_lock, at least to wake up any waiting master_pos_wait() */
Marc Alff's avatar
Marc Alff committed
4347
  mysql_mutex_lock(&rli->data_lock);
4348
  DBUG_ASSERT(rli->slave_running == MYSQL_SLAVE_RUN_NOT_CONNECT); // tracking buffer overrun
4349
  /* When master_pos_wait() wakes up it will check this and terminate */
4350
  rli->slave_running= MYSQL_SLAVE_NOT_RUN;
4351 4352 4353
  /* Forget the relay log's format */
  delete rli->relay_log.description_event_for_exec;
  rli->relay_log.description_event_for_exec= 0;
4354
  /* Wake up master_pos_wait() */
Marc Alff's avatar
Marc Alff committed
4355
  mysql_mutex_unlock(&rli->data_lock);
4356
  DBUG_PRINT("info",("Signaling possibly waiting master_pos_wait() functions"));
Marc Alff's avatar
Marc Alff committed
4357
  mysql_cond_broadcast(&rli->data_cond);
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4358
  rli->ignore_log_space_limit= 0; /* don't need any lock */
4359 4360
  /* we die so won't remember charset - re-update them on next thread start */
  rli->cached_charset_invalidate();
4361
  rli->save_temporary_tables = thd->temporary_tables;
unknown's avatar
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4362 4363 4364 4365 4366

  /*
    TODO: see if we can do this conditionally in next_event() instead
    to avoid unneeded position re-init
  */
4367 4368
  thd->temporary_tables = 0; // remove tempation from destructor to close them
  DBUG_ASSERT(rli->sql_thd == thd);
4369
  THD_CHECK_SENTRY(thd);
4370
  rli->sql_thd= 0;
4371
  set_thd_in_use_temporary_tables(rli);  // (re)set sql_thd in use for saved temp tables
Marc Alff's avatar
Marc Alff committed
4372
  mysql_mutex_lock(&LOCK_thread_count);
4373
  THD_CHECK_SENTRY(thd);
4374
  delete thd;
Marc Alff's avatar
Marc Alff committed
4375
  mysql_mutex_unlock(&LOCK_thread_count);
4376 4377 4378 4379 4380
 /*
  Note: the order of the broadcast and unlock calls below (first broadcast, then unlock)
  is important. Otherwise a killer_thread can execute between the calls and
  delete the mi structure leading to a crash! (see BUG#25306 for details)
 */ 
Marc Alff's avatar
Marc Alff committed
4381
  mysql_cond_broadcast(&rli->stop_cond);
4382
  DBUG_EXECUTE_IF("simulate_slave_delay_at_terminate_bug38694", sleep(5););
Marc Alff's avatar
Marc Alff committed
4383
  mysql_mutex_unlock(&rli->run_lock);  // tell the world we are done
4384 4385

  DBUG_LEAVE;                                   // Must match DBUG_ENTER()
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4386
  my_thread_end();
4387
  pthread_exit(0);
4388
  return 0;                                     // Avoid compiler warnings
4389
}
unknown's avatar
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4390

4391

unknown's avatar
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4392
/*
4393
  process_io_create_file()
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4394
*/
4395

4396
static int process_io_create_file(Master_info* mi, Create_file_log_event* cev)
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4397 4398 4399 4400
{
  int error = 1;
  ulong num_bytes;
  bool cev_not_written;
4401 4402
  THD *thd = mi->io_thd;
  NET *net = &mi->mysql->net;
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4403
  DBUG_ENTER("process_io_create_file");
unknown's avatar
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4404 4405

  if (unlikely(!cev->is_valid()))
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4406
    DBUG_RETURN(1);
4407

4408
  if (!mi->rpl_filter->db_ok(cev->db))
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4409 4410
  {
    skip_load_data_infile(net);
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4411
    DBUG_RETURN(0);
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4412 4413 4414
  }
  DBUG_ASSERT(cev->inited_from_old);
  thd->file_id = cev->file_id = mi->file_id++;
4415
  thd->variables.server_id = cev->server_id;
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4416
  cev_not_written = 1;
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4417

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4418 4419 4420
  if (unlikely(net_request_file(net,cev->fname)))
  {
    sql_print_error("Slave I/O: failed requesting download of '%s'",
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4421
                    cev->fname);
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4422 4423 4424
    goto err;
  }

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4425 4426 4427 4428
  /*
    This dummy block is so we could instantiate Append_block_log_event
    once and then modify it slightly instead of doing it multiple times
    in the loop
unknown's avatar
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4429 4430
  */
  {
4431
    Append_block_log_event aev(thd,0,0,0,0);
unknown's avatar
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4432

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4433 4434 4435 4436
    for (;;)
    {
      if (unlikely((num_bytes=my_net_read(net)) == packet_error))
      {
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4437 4438 4439
        sql_print_error("Network read error downloading '%s' from master",
                        cev->fname);
        goto err;
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4440 4441 4442
      }
      if (unlikely(!num_bytes)) /* eof */
      {
4443 4444
	/* 3.23 master wants it */
        net_write_command(net, 0, (uchar*) "", 0, (uchar*) "", 0);
unknown's avatar
unknown committed
4445 4446 4447 4448 4449 4450 4451
        /*
          If we wrote Create_file_log_event, then we need to write
          Execute_load_log_event. If we did not write Create_file_log_event,
          then this is an empty file and we can just do as if the LOAD DATA
          INFILE had not existed, i.e. write nothing.
        */
        if (unlikely(cev_not_written))
unknown's avatar
unknown committed
4452 4453 4454 4455 4456
          break;
        Execute_load_log_event xev(thd,0,0);
        xev.log_pos = cev->log_pos;
        if (unlikely(mi->rli.relay_log.append(&xev)))
        {
4457 4458 4459
          mi->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_WRITE_FAILURE,
                     ER(ER_SLAVE_RELAY_LOG_WRITE_FAILURE),
                     "error writing Exec_load event to relay log");
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4460 4461 4462 4463
          goto err;
        }
        mi->rli.relay_log.harvest_bytes_written(&mi->rli.log_space_total);
        break;
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4464 4465 4466
      }
      if (unlikely(cev_not_written))
      {
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4467
        cev->block = net->read_pos;
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4468 4469 4470
        cev->block_len = num_bytes;
        if (unlikely(mi->rli.relay_log.append(cev)))
        {
4471 4472 4473
          mi->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_WRITE_FAILURE,
                     ER(ER_SLAVE_RELAY_LOG_WRITE_FAILURE),
                     "error writing Create_file event to relay log");
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4474 4475 4476 4477
          goto err;
        }
        cev_not_written=0;
        mi->rli.relay_log.harvest_bytes_written(&mi->rli.log_space_total);
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4478 4479 4480
      }
      else
      {
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4481
        aev.block = net->read_pos;
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4482 4483 4484 4485
        aev.block_len = num_bytes;
        aev.log_pos = cev->log_pos;
        if (unlikely(mi->rli.relay_log.append(&aev)))
        {
4486 4487 4488
          mi->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_WRITE_FAILURE,
                     ER(ER_SLAVE_RELAY_LOG_WRITE_FAILURE),
                     "error writing Append_block event to relay log");
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4489 4490 4491
          goto err;
        }
        mi->rli.relay_log.harvest_bytes_written(&mi->rli.log_space_total) ;
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4492 4493 4494 4495 4496
      }
    }
  }
  error=0;
err:
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4497
  DBUG_RETURN(error);
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4498
}
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4499

4500

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4501
/*
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4502 4503 4504 4505
  Start using a new binary log on the master

  SYNOPSIS
    process_io_rotate()
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4506 4507
    mi                  master_info for the slave
    rev                 The rotate log event read from the binary log
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4508 4509

  DESCRIPTION
4510
    Updates the master info with the place in the next binary
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4511
    log where we should start reading.
4512
    Rotate the relay log to avoid mixed-format relay logs.
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4513 4514 4515 4516 4517

  NOTES
    We assume we already locked mi->data_lock

  RETURN VALUES
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4518 4519
    0           ok
    1           Log event is illegal
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4520 4521 4522

*/

4523
static int process_io_rotate(Master_info *mi, Rotate_log_event *rev)
4524
{
4525
  DBUG_ENTER("process_io_rotate");
Marc Alff's avatar
Marc Alff committed
4526
  mysql_mutex_assert_owner(&mi->data_lock);
4527

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4528
  if (unlikely(!rev->is_valid()))
4529
    DBUG_RETURN(1);
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4530

4531
  /* Safe copy as 'rev' has been "sanitized" in Rotate_log_event's ctor */
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4532 4533
  memcpy(mi->master_log_name, rev->new_log_ident, rev->ident_len+1);
  mi->master_log_pos= rev->pos;
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4534
  DBUG_PRINT("info", ("master_log_pos: '%s' %lu",
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4535
                      mi->master_log_name, (ulong) mi->master_log_pos));
4536
#ifndef DBUG_OFF
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4537 4538 4539 4540 4541
  /*
    If we do not do this, we will be getting the first
    rotate event forever, so we need to not disconnect after one.
  */
  if (disconnect_slave_event_count)
4542
    mi->events_till_disconnect++;
4543
#endif
4544

4545 4546 4547 4548 4549 4550 4551 4552 4553
  /*
    If description_event_for_queue is format <4, there is conversion in the
    relay log to the slave's format (4). And Rotate can mean upgrade or
    nothing. If upgrade, it's to 5.0 or newer, so we will get a Format_desc, so
    no need to reset description_event_for_queue now. And if it's nothing (same
    master version as before), no need (still using the slave's format).
  */
  if (mi->rli.relay_log.description_event_for_queue->binlog_version >= 4)
  {
4554 4555 4556
    DBUG_ASSERT(mi->rli.relay_log.description_event_for_queue->checksum_alg ==
                mi->rli.relay_log.relay_log_checksum_alg);
    
4557 4558 4559 4560
    delete mi->rli.relay_log.description_event_for_queue;
    /* start from format 3 (MySQL 4.0) again */
    mi->rli.relay_log.description_event_for_queue= new
      Format_description_log_event(3);
4561 4562
    mi->rli.relay_log.description_event_for_queue->checksum_alg=
      mi->rli.relay_log.relay_log_checksum_alg;    
4563
  }
4564 4565 4566 4567
  /*
    Rotate the relay log makes binlog format detection easier (at next slave
    start or mysqlbinlog)
  */
4568
  DBUG_RETURN(rotate_relay_log(mi) /* will take the right mutexes */);
4569 4570
}

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4571
/*
4572 4573
  Reads a 3.23 event and converts it to the slave's format. This code was
  copied from MySQL 4.0.
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4574
*/
4575
static int queue_binlog_ver_1_event(Master_info *mi, const char *buf,
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4576
                           ulong event_len)
4577
{
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4578
  const char *errmsg = 0;
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4579 4580 4581
  ulong inc_pos;
  bool ignore_event= 0;
  char *tmp_buf = 0;
4582
  Relay_log_info *rli= &mi->rli;
4583
  DBUG_ENTER("queue_binlog_ver_1_event");
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4584

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4585 4586 4587
  /*
    If we get Load event, we need to pass a non-reusable buffer
    to read_log_event, so we do a trick
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4588
  */
4589
  if ((uchar)buf[EVENT_TYPE_OFFSET] == LOAD_EVENT)
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4590 4591 4592
  {
    if (unlikely(!(tmp_buf=(char*)my_malloc(event_len+1,MYF(MY_WME)))))
    {
4593 4594
      mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR,
                 ER(ER_SLAVE_FATAL_ERROR), "Memory allocation failed");
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4595
      DBUG_RETURN(1);
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4596 4597
    }
    memcpy(tmp_buf,buf,event_len);
4598 4599 4600 4601 4602 4603 4604 4605
    /*
      Create_file constructor wants a 0 as last char of buffer, this 0 will
      serve as the string-termination char for the file's name (which is at the
      end of the buffer)
      We must increment event_len, otherwise the event constructor will not see
      this end 0, which leads to segfault.
    */
    tmp_buf[event_len++]=0;
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4606
    int4store(tmp_buf+EVENT_LEN_OFFSET, event_len);
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4607 4608
    buf = (const char*)tmp_buf;
  }
4609 4610 4611 4612 4613 4614
  /*
    This will transform LOAD_EVENT into CREATE_FILE_EVENT, ask the master to
    send the loaded file, and write it to the relay log in the form of
    Append_block/Exec_load (the SQL thread needs the data, as that thread is not
    connected to the master).
  */
4615 4616 4617
  Log_event *ev=
    Log_event::read_log_event(buf, event_len, &errmsg,
                              mi->rli.relay_log.description_event_for_queue, 0);
4618
  if (unlikely(!ev))
4619 4620
  {
    sql_print_error("Read invalid event from master: '%s',\
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4621
 master could be corrupt but a more likely cause of this is a bug",
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4622
                    errmsg);
4623
    my_free(tmp_buf);
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4624
    DBUG_RETURN(1);
4625
  }
4626

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4627
  mysql_mutex_lock(&mi->data_lock);
4628
  ev->log_pos= mi->master_log_pos; /* 3.23 events don't contain log_pos */
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4629
  switch (ev->get_type_code()) {
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4630
  case STOP_EVENT:
4631
    ignore_event= 1;
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4632 4633
    inc_pos= event_len;
    break;
4634
  case ROTATE_EVENT:
4635
    if (unlikely(process_io_rotate(mi,(Rotate_log_event*)ev)))
4636 4637
    {
      delete ev;
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4638
      mysql_mutex_unlock(&mi->data_lock);
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4639
      DBUG_RETURN(1);
4640
    }
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4641
    inc_pos= 0;
4642
    break;
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4643
  case CREATE_FILE_EVENT:
4644 4645 4646 4647 4648 4649
    /*
      Yes it's possible to have CREATE_FILE_EVENT here, even if we're in
      queue_old_event() which is for 3.23 events which don't comprise
      CREATE_FILE_EVENT. This is because read_log_event() above has just
      transformed LOAD_EVENT into CREATE_FILE_EVENT.
    */
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  {
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    /* We come here when and only when tmp_buf != 0 */
4652
    DBUG_ASSERT(tmp_buf != 0);
4653 4654
    inc_pos=event_len;
    ev->log_pos+= inc_pos;
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4655
    int error = process_io_create_file(mi,(Create_file_log_event*)ev);
4656
    delete ev;
4657
    mi->master_log_pos += inc_pos;
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4658
    DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
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4659
    mysql_mutex_unlock(&mi->data_lock);
4660
    my_free(tmp_buf);
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    DBUG_RETURN(error);
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  }
4663
  default:
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    inc_pos= event_len;
4665 4666
    break;
  }
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  if (likely(!ignore_event))
4668
  {
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4669 4670
    if (ev->log_pos)
      /*
4671 4672 4673 4674
         Don't do it for fake Rotate events (see comment in
      Log_event::Log_event(const char* buf...) in log_event.cc).
      */
      ev->log_pos+= event_len; /* make log_pos be the pos of the end of the event */
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    if (unlikely(rli->relay_log.append(ev)))
4676 4677
    {
      delete ev;
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4678
      mysql_mutex_unlock(&mi->data_lock);
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4679
      DBUG_RETURN(1);
4680
    }
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4681
    rli->relay_log.harvest_bytes_written(&rli->log_space_total);
4682 4683
  }
  delete ev;
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  mi->master_log_pos+= inc_pos;
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  DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
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4686
  mysql_mutex_unlock(&mi->data_lock);
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4687
  DBUG_RETURN(0);
4688 4689
}

4690 4691 4692 4693
/*
  Reads a 4.0 event and converts it to the slave's format. This code was copied
  from queue_binlog_ver_1_event(), with some affordable simplifications.
*/
4694
static int queue_binlog_ver_3_event(Master_info *mi, const char *buf,
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                           ulong event_len)
4696 4697 4698 4699
{
  const char *errmsg = 0;
  ulong inc_pos;
  char *tmp_buf = 0;
4700
  Relay_log_info *rli= &mi->rli;
4701 4702 4703
  DBUG_ENTER("queue_binlog_ver_3_event");

  /* read_log_event() will adjust log_pos to be end_log_pos */
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  Log_event *ev=
    Log_event::read_log_event(buf,event_len, &errmsg,
                              mi->rli.relay_log.description_event_for_queue, 0);
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  if (unlikely(!ev))
  {
    sql_print_error("Read invalid event from master: '%s',\
 master could be corrupt but a more likely cause of this is a bug",
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4711
                    errmsg);
4712
    my_free(tmp_buf);
4713 4714
    DBUG_RETURN(1);
  }
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4715
  mysql_mutex_lock(&mi->data_lock);
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  switch (ev->get_type_code()) {
  case STOP_EVENT:
    goto err;
  case ROTATE_EVENT:
    if (unlikely(process_io_rotate(mi,(Rotate_log_event*)ev)))
    {
      delete ev;
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4723
      mysql_mutex_unlock(&mi->data_lock);
4724 4725 4726 4727 4728 4729 4730 4731
      DBUG_RETURN(1);
    }
    inc_pos= 0;
    break;
  default:
    inc_pos= event_len;
    break;
  }
4732

4733 4734 4735
  if (unlikely(rli->relay_log.append(ev)))
  {
    delete ev;
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4736
    mysql_mutex_unlock(&mi->data_lock);
4737 4738 4739 4740 4741 4742
    DBUG_RETURN(1);
  }
  rli->relay_log.harvest_bytes_written(&rli->log_space_total);
  delete ev;
  mi->master_log_pos+= inc_pos;
err:
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4743
  DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
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4744
  mysql_mutex_unlock(&mi->data_lock);
4745 4746 4747 4748 4749 4750 4751 4752 4753 4754
  DBUG_RETURN(0);
}

/*
  queue_old_event()

  Writes a 3.23 or 4.0 event to the relay log, after converting it to the 5.0
  (exactly, slave's) format. To do the conversion, we create a 5.0 event from
  the 3.23/4.0 bytes, then write this event to the relay log.

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  TODO:
4756 4757 4758 4759
    Test this code before release - it has to be tested on a separate
    setup with 3.23 master or 4.0 master
*/

4760
static int queue_old_event(Master_info *mi, const char *buf,
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                           ulong event_len)
4762
{
4763 4764
  DBUG_ENTER("queue_old_event");

4765 4766 4767
  switch (mi->rli.relay_log.description_event_for_queue->binlog_version)
  {
  case 1:
4768
      DBUG_RETURN(queue_binlog_ver_1_event(mi,buf,event_len));
4769
  case 3:
4770
      DBUG_RETURN(queue_binlog_ver_3_event(mi,buf,event_len));
4771 4772
  default: /* unsupported format; eg version 2 */
    DBUG_PRINT("info",("unsupported binlog format %d in queue_old_event()",
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                       mi->rli.relay_log.description_event_for_queue->binlog_version));
4774
    DBUG_RETURN(1);
4775 4776
  }
}
4777

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/*
4779 4780
  queue_event()

4781 4782 4783 4784 4785
  If the event is 3.23/4.0, passes it to queue_old_event() which will convert
  it. Otherwise, writes a 5.0 (or newer) event to the relay log. Then there is
  no format conversion, it's pure read/write of bytes.
  So a 5.0.0 slave's relay log can contain events in the slave's format or in
  any >=5.0.0 format.
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*/

4788
static int queue_event(Master_info* mi,const char* buf, ulong event_len)
4789
{
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4790
  int error= 0;
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4791
  String error_msg;
4792 4793
  ulonglong inc_pos;
  ulonglong event_pos;
4794
  Relay_log_info *rli= &mi->rli;
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4795
  mysql_mutex_t *log_lock= rli->relay_log.get_log_lock();
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4796
  ulong s_id;
4797
  bool unlock_data_lock= TRUE;
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  bool gtid_skip_enqueue= false;

4800 4801 4802 4803 4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814 4815 4816
  /*
    FD_q must have been prepared for the first R_a event
    inside get_master_version_and_clock()
    Show-up of FD:s affects checksum_alg at once because
    that changes FD_queue.
  */
  uint8 checksum_alg= mi->checksum_alg_before_fd != BINLOG_CHECKSUM_ALG_UNDEF ? 
    mi->checksum_alg_before_fd :
    mi->rli.relay_log.relay_log_checksum_alg;

  char *save_buf= NULL; // needed for checksumming the fake Rotate event
  char rot_buf[LOG_EVENT_HEADER_LEN + ROTATE_HEADER_LEN + FN_REFLEN];

  DBUG_ASSERT(checksum_alg == BINLOG_CHECKSUM_ALG_OFF || 
              checksum_alg == BINLOG_CHECKSUM_ALG_UNDEF || 
              checksum_alg == BINLOG_CHECKSUM_ALG_CRC32); 

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  DBUG_ENTER("queue_event");
4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849 4850 4851 4852 4853 4854 4855 4856 4857 4858 4859 4860
  /*
    FD_queue checksum alg description does not apply in a case of
    FD itself. The one carries both parts of the checksum data.
  */
  if (buf[EVENT_TYPE_OFFSET] == FORMAT_DESCRIPTION_EVENT)
  {
    checksum_alg= get_checksum_alg(buf, event_len);
  }
  else if (buf[EVENT_TYPE_OFFSET] == START_EVENT_V3)
  {
    // checksum behaviour is similar to the pre-checksum FD handling
    mi->checksum_alg_before_fd= BINLOG_CHECKSUM_ALG_UNDEF;
    mi->rli.relay_log.description_event_for_queue->checksum_alg=
      mi->rli.relay_log.relay_log_checksum_alg= checksum_alg=
      BINLOG_CHECKSUM_ALG_OFF;
  }

  // does not hold always because of old binlog can work with NM 
  // DBUG_ASSERT(checksum_alg != BINLOG_CHECKSUM_ALG_UNDEF);

  // should hold unless manipulations with RL. Tests that do that
  // will have to refine the clause.
  DBUG_ASSERT(mi->rli.relay_log.relay_log_checksum_alg !=
              BINLOG_CHECKSUM_ALG_UNDEF);
              
  // Emulate the network corruption
  DBUG_EXECUTE_IF("corrupt_queue_event",
    if (buf[EVENT_TYPE_OFFSET] != FORMAT_DESCRIPTION_EVENT)
    {
      char *debug_event_buf_c = (char*) buf;
      int debug_cor_pos = rand() % (event_len - BINLOG_CHECKSUM_LEN);
      debug_event_buf_c[debug_cor_pos] =~ debug_event_buf_c[debug_cor_pos];
      DBUG_PRINT("info", ("Corrupt the event at queue_event: byte on position %d", debug_cor_pos));
      DBUG_SET("-d,corrupt_queue_event");
    }
  );
                                              
  if (event_checksum_test((uchar *) buf, event_len, checksum_alg))
  {
    error= ER_NETWORK_READ_EVENT_CHECKSUM_FAILURE;
    unlock_data_lock= FALSE;
    goto err;
  }
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4861

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4862 4863
  LINT_INIT(inc_pos);

4864
  if (mi->rli.relay_log.description_event_for_queue->binlog_version<4 &&
4865
      (uchar)buf[EVENT_TYPE_OFFSET] != FORMAT_DESCRIPTION_EVENT /* a way to escape */)
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4866
    DBUG_RETURN(queue_old_event(mi,buf,event_len));
4867

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4868
  mysql_mutex_lock(&mi->data_lock);
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4869

4870
  switch ((uchar)buf[EVENT_TYPE_OFFSET]) {
4871
  case STOP_EVENT:
4872 4873
    /*
      We needn't write this event to the relay log. Indeed, it just indicates a
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4874 4875 4876
      master server shutdown. The only thing this does is cleaning. But
      cleaning is already done on a per-master-thread basis (as the master
      server is shutting down cleanly, it has written all DROP TEMPORARY TABLE
4877
      prepared statements' deletion are TODO only when we binlog prep stmts).
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4878

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4879 4880 4881 4882
      We don't even increment mi->master_log_pos, because we may be just after
      a Rotate event. Btw, in a few milliseconds we are going to have a Start
      event from the next binlog (unless the master is presently running
      without --log-bin).
4883 4884
    */
    goto err;
4885 4886
  case ROTATE_EVENT:
  {
4887 4888 4889 4890 4891
    Rotate_log_event rev(buf, checksum_alg != BINLOG_CHECKSUM_ALG_OFF ?
                         event_len - BINLOG_CHECKSUM_LEN : event_len,
                         mi->rli.relay_log.description_event_for_queue);

    if (unlikely(process_io_rotate(mi, &rev)))
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    {
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Andrei Elkin committed
4893
      error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
4894
      goto err;
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4895
    }
4896 4897 4898 4899 4900 4901 4902 4903 4904 4905 4906 4907 4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925 4926 4927 4928 4929 4930 4931 4932 4933 4934 4935 4936 4937 4938 4939 4940 4941 4942 4943 4944 4945 4946 4947
    /* 
       Checksum special cases for the fake Rotate (R_f) event caused by the protocol
       of events generation and serialization in RL where Rotate of master is 
       queued right next to FD of slave.
       Since it's only FD that carries the alg desc of FD_s has to apply to R_m.
       Two special rules apply only to the first R_f which comes in before any FD_m.
       The 2nd R_f should be compatible with the FD_s that must have taken over
       the last seen FD_m's (A).
       
       RSC_1: If OM \and fake Rotate \and slave is configured to
              to compute checksum for its first FD event for RL
              the fake Rotate gets checksummed here.
    */
    if (uint4korr(&buf[0]) == 0 && checksum_alg == BINLOG_CHECKSUM_ALG_OFF &&
        mi->rli.relay_log.relay_log_checksum_alg != BINLOG_CHECKSUM_ALG_OFF)
    {
      ha_checksum rot_crc= my_checksum(0L, NULL, 0);
      event_len += BINLOG_CHECKSUM_LEN;
      memcpy(rot_buf, buf, event_len - BINLOG_CHECKSUM_LEN);
      int4store(&rot_buf[EVENT_LEN_OFFSET],
                uint4korr(&rot_buf[EVENT_LEN_OFFSET]) + BINLOG_CHECKSUM_LEN);
      rot_crc= my_checksum(rot_crc, (const uchar *) rot_buf,
                           event_len - BINLOG_CHECKSUM_LEN);
      int4store(&rot_buf[event_len - BINLOG_CHECKSUM_LEN], rot_crc);
      DBUG_ASSERT(event_len == uint4korr(&rot_buf[EVENT_LEN_OFFSET]));
      DBUG_ASSERT(mi->rli.relay_log.description_event_for_queue->checksum_alg ==
                  mi->rli.relay_log.relay_log_checksum_alg);
      /* the first one */
      DBUG_ASSERT(mi->checksum_alg_before_fd != BINLOG_CHECKSUM_ALG_UNDEF);
      save_buf= (char *) buf;
      buf= rot_buf;
    }
    else
      /*
        RSC_2: If NM \and fake Rotate \and slave does not compute checksum
        the fake Rotate's checksum is stripped off before relay-logging.
      */
      if (uint4korr(&buf[0]) == 0 && checksum_alg != BINLOG_CHECKSUM_ALG_OFF &&
          mi->rli.relay_log.relay_log_checksum_alg == BINLOG_CHECKSUM_ALG_OFF)
      {
        event_len -= BINLOG_CHECKSUM_LEN;
        memcpy(rot_buf, buf, event_len);
        int4store(&rot_buf[EVENT_LEN_OFFSET],
                  uint4korr(&rot_buf[EVENT_LEN_OFFSET]) - BINLOG_CHECKSUM_LEN);
        DBUG_ASSERT(event_len == uint4korr(&rot_buf[EVENT_LEN_OFFSET]));
        DBUG_ASSERT(mi->rli.relay_log.description_event_for_queue->checksum_alg ==
                    mi->rli.relay_log.relay_log_checksum_alg);
        /* the first one */
        DBUG_ASSERT(mi->checksum_alg_before_fd != BINLOG_CHECKSUM_ALG_UNDEF);
        save_buf= (char *) buf;
        buf= rot_buf;
      }
4948 4949 4950 4951
    /*
      Now the I/O thread has just changed its mi->master_log_name, so
      incrementing mi->master_log_pos is nonsense.
    */
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    inc_pos= 0;
4953 4954
    break;
  }
4955 4956 4957 4958 4959 4960 4961
  case FORMAT_DESCRIPTION_EVENT:
  {
    /*
      Create an event, and save it (when we rotate the relay log, we will have
      to write this event again).
    */
    /*
4962 4963 4964
      We are the only thread which reads/writes description_event_for_queue.
      The relay_log struct does not move (though some members of it can
      change), so we needn't any lock (no rli->data_lock, no log lock).
4965
    */
4966
    Format_description_log_event* tmp;
4967
    const char* errmsg;
4968 4969
    // mark it as undefined that is irrelevant anymore
    mi->checksum_alg_before_fd= BINLOG_CHECKSUM_ALG_UNDEF;
4970
    if (!(tmp= (Format_description_log_event*)
4971
          Log_event::read_log_event(buf, event_len, &errmsg,
4972 4973
                                    mi->rli.relay_log.description_event_for_queue,
                                    1)))
4974
    {
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Andrei Elkin committed
4975
      error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
4976 4977
      goto err;
    }
4978 4979
    delete mi->rli.relay_log.description_event_for_queue;
    mi->rli.relay_log.description_event_for_queue= tmp;
4980 4981 4982 4983 4984 4985
    if (tmp->checksum_alg == BINLOG_CHECKSUM_ALG_UNDEF)
      tmp->checksum_alg= BINLOG_CHECKSUM_ALG_OFF;

    /* installing new value of checksum Alg for relay log */
    mi->rli.relay_log.relay_log_checksum_alg= tmp->checksum_alg;

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4986 4987 4988 4989 4990 4991 4992 4993
    /*
      Do not queue any format description event that we receive after a
      reconnect where we are skipping over a partial event group received
      before the reconnect.

      (If we queued such an event, and it was the first format_description
      event after master restart, the slave SQL thread would think that
      the partial event group before it in the relay log was from a
4994
      previous master crash and should be rolled back).
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    */
4996
    if (unlikely(mi->gtid_reconnect_event_skip_count && !mi->gtid_event_seen))
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        gtid_skip_enqueue= true;

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    /*
5000
       Though this does some conversion to the slave's format, this will
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5001
       preserve the master's binlog format version, and number of event types.
5002
    */
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    /*
5004
       If the event was not requested by the slave (the slave did not ask for
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       it), i.e. has end_log_pos=0, we do not increment mi->master_log_pos
5006 5007 5008
    */
    inc_pos= uint4korr(buf+LOG_POS_OFFSET) ? event_len : 0;
    DBUG_PRINT("info",("binlog format is now %d",
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                       mi->rli.relay_log.description_event_for_queue->binlog_version));
5010 5011 5012

  }
  break;
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  case HEARTBEAT_LOG_EVENT:
  {
    /*
      HB (heartbeat) cannot come before RL (Relay)
    */
    char  llbuf[22];
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    Heartbeat_log_event hb(buf,
                           mi->rli.relay_log.relay_log_checksum_alg
                           != BINLOG_CHECKSUM_ALG_OFF ?
                           event_len - BINLOG_CHECKSUM_LEN : event_len,
                           mi->rli.relay_log.description_event_for_queue);
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    if (!hb.is_valid())
    {
      error= ER_SLAVE_HEARTBEAT_FAILURE;
      error_msg.append(STRING_WITH_LEN("inconsistent heartbeat event content;"));
      error_msg.append(STRING_WITH_LEN("the event's data: log_file_name "));
      error_msg.append(hb.get_log_ident(), (uint) strlen(hb.get_log_ident()));
      error_msg.append(STRING_WITH_LEN(" log_pos "));
      llstr(hb.log_pos, llbuf);
      error_msg.append(llbuf, strlen(llbuf));
      goto err;
    }
    mi->received_heartbeats++;
    /* 
       compare local and event's versions of log_file, log_pos.
       
       Heartbeat is sent only after an event corresponding to the corrdinates
       the heartbeat carries.
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       Slave can not have a higher coordinate except in the only
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       special case when mi->master_log_name, master_log_pos have never
       been updated by Rotate event i.e when slave does not have any history
       with the master (and thereafter mi->master_log_pos is NULL).

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5047 5048
       Slave can have lower coordinates, if some event from master was omitted.

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       TODO: handling `when' for SHOW SLAVE STATUS' snds behind
    */
    if ((memcmp(mi->master_log_name, hb.get_log_ident(), hb.get_ident_len())
         && mi->master_log_name != NULL)
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5053
        || mi->master_log_pos > hb.log_pos)
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    {
      /* missed events of heartbeat from the past */
      error= ER_SLAVE_HEARTBEAT_FAILURE;
      error_msg.append(STRING_WITH_LEN("heartbeat is not compatible with local info;"));
      error_msg.append(STRING_WITH_LEN("the event's data: log_file_name "));
      error_msg.append(hb.get_log_ident(), (uint) strlen(hb.get_log_ident()));
      error_msg.append(STRING_WITH_LEN(" log_pos "));
      llstr(hb.log_pos, llbuf);
      error_msg.append(llbuf, strlen(llbuf));
      goto err;
    }
    goto skip_relay_logging;
  }
  break;
5068

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5069 5070 5071 5072 5073
  case GTID_LIST_EVENT:
  {
    const char *errmsg;
    Gtid_list_log_event *glev;
    Log_event *tmp;
5074
    uint32 flags;
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    if (!(tmp= Log_event::read_log_event(buf, event_len, &errmsg,
           mi->rli.relay_log.description_event_for_queue,
           opt_slave_sql_verify_checksum)))
    {
      error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
      goto err;
    }
    glev= static_cast<Gtid_list_log_event *>(tmp);
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5084
    event_pos= glev->log_pos;
5085
    flags= glev->gl_flags;
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    delete glev;

    /*
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      We use fake Gtid_list events to update the old-style position (among
      other things).

      Early code created fake Gtid_list events with zero log_pos, those should
      not modify old-style position.
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    */
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    if (event_pos == 0 || event_pos <= mi->master_log_pos)
      inc_pos= 0;
    else
      inc_pos= event_pos - mi->master_log_pos;
5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109

    if (mi->rli.until_condition == Relay_log_info::UNTIL_GTID &&
        flags & Gtid_list_log_event::FLAG_UNTIL_REACHED)
    {
      char str_buf[128];
      String str(str_buf, sizeof(str_buf), system_charset_info);
      mi->rli.until_gtid_pos.to_string(&str);
      sql_print_information("Slave IO thread stops because it reached its"
                            " UNTIL master_gtid_pos %s", str.c_ptr_safe());
      mi->abort_slave= true;
    }
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  }
  break;

  case GTID_EVENT:
  {
    uchar dummy_flag;

    if (mi->using_gtid == Master_info::USE_GTID_NO)
      goto default_action;
    if (unlikely(!mi->gtid_event_seen))
    {
      mi->gtid_event_seen= true;
      if (mi->gtid_reconnect_event_skip_count)
      {
        rpl_gtid gtid;

        /*
          If we are reconnecting, and we need to skip a partial event group
          already queued to the relay log before the reconnect, then we check
          that we actually get the same event group (same GTID) as before, so
          we do not end up with half of one group and half another.

          The only way we should be able to receive a different GTID than what
          we expect is if the binlog on the master (or more likely the whole
          master server) was replaced with a different one, one the same IP
          address, _and_ the new master happens to have domains in a different
          order so we get the GTID from a different domain first. Still, it is
          best to protect against this case.
        */
        if (Gtid_log_event::peek(buf, event_len, checksum_alg,
                                 &gtid.domain_id, &gtid.server_id,
                                 &gtid.seq_no, &dummy_flag))
        {
          error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
          goto err;
        }
        if (gtid.domain_id != mi->last_queued_gtid.domain_id ||
            gtid.server_id != mi->last_queued_gtid.server_id ||
            gtid.seq_no != mi->last_queued_gtid.seq_no)
        {
          bool first;
          error= ER_SLAVE_UNEXPECTED_MASTER_SWITCH;
          error_msg.append(STRING_WITH_LEN("Expected: "));
          first= true;
          rpl_slave_state_tostring_helper(&error_msg, &mi->last_queued_gtid,
                                          &first);
          error_msg.append(STRING_WITH_LEN(", received: "));
          first= true;
          rpl_slave_state_tostring_helper(&error_msg, &gtid, &first);
          goto err;
        }
      }
    }

    if (unlikely(mi->gtid_reconnect_event_skip_count))
    {
      goto default_action;
    }

    /*
      We have successfully queued to relay log everything before this GTID, so
      in case of reconnect we can start from after any previous GTID.
    */
    if (mi->events_queued_since_last_gtid)
    {
      mi->gtid_current_pos.update(&mi->last_queued_gtid);
      mi->events_queued_since_last_gtid= 0;
    }
    if (Gtid_log_event::peek(buf, event_len, checksum_alg,
                             &mi->last_queued_gtid.domain_id,
                             &mi->last_queued_gtid.server_id,
                             &mi->last_queued_gtid.seq_no, &dummy_flag))
    {
      error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
      goto err;
    }
    ++mi->events_queued_since_last_gtid;
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  }
  break;

5190
  default:
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5191
  default_action:
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    if (mi->using_gtid != Master_info::USE_GTID_NO && mi->gtid_event_seen)
    {
      if (unlikely(mi->gtid_reconnect_event_skip_count))
      {
        --mi->gtid_reconnect_event_skip_count;
        gtid_skip_enqueue= true;
      }
      else if (mi->events_queued_since_last_gtid)
        ++mi->events_queued_since_last_gtid;
    }

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5203
    inc_pos= event_len;
5204 5205
    break;
  }
5206

5207
  /*
5208
    If we filter events master-side (eg. @@skip_replication), we will see holes
5209 5210 5211 5212 5213 5214 5215 5216 5217
    in the event positions from the master. If we see such a hole, adjust
    mi->master_log_pos accordingly so we maintain the correct position (for
    reconnect, MASTER_POS_WAIT(), etc.)
  */
  if (inc_pos > 0 &&
      event_len >= LOG_POS_OFFSET+4 &&
      (event_pos= uint4korr(buf+LOG_POS_OFFSET)) > mi->master_log_pos + inc_pos)
  {
    inc_pos= event_pos - mi->master_log_pos;
Sergei Golubchik's avatar
Sergei Golubchik committed
5218
    DBUG_PRINT("info", ("Adjust master_log_pos %llu->%llu to account for "
5219
                        "master-side filtering",
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Sergei Golubchik committed
5220
                        mi->master_log_pos + inc_pos, event_pos));
5221 5222
  }

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5223 5224
  /*
     If this event is originating from this server, don't queue it.
5225
     We don't check this for 3.23 events because it's simpler like this; 3.23
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5226 5227
     will be filtered anyway by the SQL slave thread which also tests the
     server id (we must also keep this test in the SQL thread, in case somebody
5228 5229 5230 5231 5232 5233 5234 5235
     upgrades a 4.0 slave which has a not-filtered relay log).

     ANY event coming from ourselves can be ignored: it is obvious for queries;
     for STOP_EVENT/ROTATE_EVENT/START_EVENT: these cannot come from ourselves
     (--log-slave-updates would not log that) unless this slave is also its
     direct master (an unsupported, useless setup!).
  */

Marc Alff's avatar
Marc Alff committed
5236
  mysql_mutex_lock(log_lock);
Andrei Elkin's avatar
Andrei Elkin committed
5237
  s_id= uint4korr(buf + SERVER_ID_OFFSET);
5238 5239
  if ((s_id == global_system_variables.server_id &&
       !mi->rli.replicate_same_server_id) ||
Andrei Elkin's avatar
Andrei Elkin committed
5240 5241 5242 5243 5244 5245 5246 5247 5248 5249
      /*
        the following conjunction deals with IGNORE_SERVER_IDS, if set
        If the master is on the ignore list, execution of
        format description log events and rotate events is necessary.
      */
      (mi->ignore_server_ids.elements > 0 &&
       mi->shall_ignore_server_id(s_id) &&
       /* everything is filtered out from non-master */
       (s_id != mi->master_id ||
        /* for the master meta information is necessary */
5250 5251
        (buf[EVENT_TYPE_OFFSET] != FORMAT_DESCRIPTION_EVENT &&
         buf[EVENT_TYPE_OFFSET] != ROTATE_EVENT))))
5252
  {
5253 5254
    /*
      Do not write it to the relay log.
5255 5256 5257 5258 5259 5260 5261 5262
      a) We still want to increment mi->master_log_pos, so that we won't
      re-read this event from the master if the slave IO thread is now
      stopped/restarted (more efficient if the events we are ignoring are big
      LOAD DATA INFILE).
      b) We want to record that we are skipping events, for the information of
      the slave SQL thread, otherwise that thread may let
      rli->group_relay_log_pos stay too small if the last binlog's event is
      ignored.
5263 5264 5265
      But events which were generated by this slave and which do not exist in
      the master's binlog (i.e. Format_desc, Rotate & Stop) should not increment
      mi->master_log_pos.
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Andrei Elkin committed
5266 5267 5268
      If the event is originated remotely and is being filtered out by
      IGNORE_SERVER_IDS it increments mi->master_log_pos
      as well as rli->group_relay_log_pos.
5269
    */
5270 5271
    if (!(s_id == global_system_variables.server_id &&
          !mi->rli.replicate_same_server_id) ||
5272 5273 5274
        (buf[EVENT_TYPE_OFFSET] != FORMAT_DESCRIPTION_EVENT &&
         buf[EVENT_TYPE_OFFSET] != ROTATE_EVENT &&
         buf[EVENT_TYPE_OFFSET] != STOP_EVENT))
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5275
    {
5276
      mi->master_log_pos+= inc_pos;
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5277 5278 5279 5280
      memcpy(rli->ign_master_log_name_end, mi->master_log_name, FN_REFLEN);
      DBUG_ASSERT(rli->ign_master_log_name_end[0]);
      rli->ign_master_log_pos_end= mi->master_log_pos;
    }
5281
    rli->relay_log.signal_update(); // the slave SQL thread needs to re-check
Andrei Elkin's avatar
Andrei Elkin committed
5282 5283
    DBUG_PRINT("info", ("master_log_pos: %lu, event originating from %u server, ignored",
                        (ulong) mi->master_log_pos, uint4korr(buf + SERVER_ID_OFFSET)));
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  }
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  else
  {
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    /*
      Write the event to the relay log, unless we reconnected in the middle
      of an event group and now need to skip the initial part of the group that
      we already wrote before reconnecting.
    */
    if (unlikely(gtid_skip_enqueue))
    {
      mi->master_log_pos+= inc_pos;
    }
    else if (likely(!(rli->relay_log.appendv(buf,event_len,0))))
5297 5298
    {
      mi->master_log_pos+= inc_pos;
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5299
      DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
5300 5301
      rli->relay_log.harvest_bytes_written(&rli->log_space_total);
    }
5302
    else
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Andrei Elkin committed
5303 5304 5305
    {
      error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
    }
5306
    rli->ign_master_log_name_end[0]= 0; // last event is not ignored
5307 5308
    if (save_buf != NULL)
      buf= save_buf;
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5309
  }
Marc Alff's avatar
Marc Alff committed
5310
  mysql_mutex_unlock(log_lock);
5311

Andrei Elkin's avatar
Andrei Elkin committed
5312 5313
skip_relay_logging:
  
5314
err:
5315
  if (unlock_data_lock)
Sergei Golubchik's avatar
Sergei Golubchik committed
5316
    mysql_mutex_unlock(&mi->data_lock);
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unknown committed
5317
  DBUG_PRINT("info", ("error: %d", error));
Andrei Elkin's avatar
Andrei Elkin committed
5318 5319 5320 5321 5322
  if (error)
    mi->report(ERROR_LEVEL, error, ER(error), 
               (error == ER_SLAVE_RELAY_LOG_WRITE_FAILURE)?
               "could not queue event from master" :
               error_msg.ptr());
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5323
  DBUG_RETURN(error);
5324 5325
}

5326

5327
void end_relay_log_info(Relay_log_info* rli)
5328
{
5329 5330
  DBUG_ENTER("end_relay_log_info");

5331
  if (!rli->inited)
5332
    DBUG_VOID_RETURN;
5333
  if (rli->info_fd >= 0)
unknown's avatar
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5334 5335
  {
    end_io_cache(&rli->info_file);
Marc Alff's avatar
Marc Alff committed
5336
    mysql_file_close(rli->info_fd, MYF(MY_WME));
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5337 5338
    rli->info_fd = -1;
  }
5339
  if (rli->cur_log_fd >= 0)
unknown's avatar
unknown committed
5340 5341
  {
    end_io_cache(&rli->cache_buf);
Marc Alff's avatar
Marc Alff committed
5342
    mysql_file_close(rli->cur_log_fd, MYF(MY_WME));
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5343 5344
    rli->cur_log_fd = -1;
  }
5345
  rli->inited = 0;
5346
  rli->relay_log.close(LOG_CLOSE_INDEX | LOG_CLOSE_STOP_EVENT);
5347
  rli->relay_log.harvest_bytes_written(&rli->log_space_total);
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5348 5349 5350 5351 5352 5353
  /*
    Delete the slave's temporary tables from memory.
    In the future there will be other actions than this, to ensure persistance
    of slave's temp tables after shutdown.
  */
  rli->close_temporary_tables();
5354
  DBUG_VOID_RETURN;
5355 5356
}

5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375

/**
  Hook to detach the active VIO before closing a connection handle.

  The client API might close the connection (and associated data)
  in case it encounters a unrecoverable (network) error. This hook
  is called from the client code before the VIO handle is deleted
  allows the thread to detach the active vio so it does not point
  to freed memory.

  Other calls to THD::clear_active_vio throughout this module are
  redundant due to the hook but are left in place for illustrative
  purposes.
*/

extern "C" void slave_io_thread_detach_vio()
{
#ifdef SIGNAL_WITH_VIO_CLOSE
  THD *thd= current_thd;
5376
  if (thd && thd->slave_thread)
5377 5378 5379 5380 5381
    thd->clear_active_vio();
#endif
}


unknown's avatar
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5382 5383
/*
  Try to connect until successful or slave killed
5384

unknown's avatar
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5385 5386
  SYNPOSIS
    safe_connect()
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5387 5388 5389
    thd                 Thread handler for slave
    mysql               MySQL connection handle
    mi                  Replication handle
5390

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5391
  RETURN
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5392 5393
    0   ok
    #   Error
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5394
*/
5395

5396
static int safe_connect(THD* thd, MYSQL* mysql, Master_info* mi)
unknown's avatar
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5397
{
5398 5399 5400
  DBUG_ENTER("safe_connect");

  DBUG_RETURN(connect_to_master(thd, mysql, mi, 0, 0));
unknown's avatar
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5401 5402
}

5403

5404
/*
unknown's avatar
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5405 5406
  SYNPOSIS
    connect_to_master()
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5407

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5408 5409 5410
  IMPLEMENTATION
    Try to connect until successful or slave killed or we have retried
    master_retry_count times
5411
*/
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5412

5413
static int connect_to_master(THD* thd, MYSQL* mysql, Master_info* mi,
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5414
                             bool reconnect, bool suppress_warnings)
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5415
{
5416
  int slave_was_killed;
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5417
  int last_errno= -2;                           // impossible error
5418
  ulong err_count=0;
unknown's avatar
unknown committed
5419
  char llbuff[22];
5420
  my_bool my_true= 1;
5421
  DBUG_ENTER("connect_to_master");
unknown's avatar
unknown committed
5422

unknown's avatar
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5423
#ifndef DBUG_OFF
5424
  mi->events_till_disconnect = disconnect_slave_event_count;
unknown's avatar
unknown committed
5425
#endif
5426
  ulong client_flag= CLIENT_REMEMBER_OPTIONS;
5427
  if (opt_slave_compressed_protocol)
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unknown committed
5428
    client_flag=CLIENT_COMPRESS;                /* We will use compression */
5429

5430 5431
  mysql_options(mysql, MYSQL_OPT_CONNECT_TIMEOUT, (char *) &slave_net_timeout);
  mysql_options(mysql, MYSQL_OPT_READ_TIMEOUT, (char *) &slave_net_timeout);
5432 5433
  mysql_options(mysql, MYSQL_OPT_USE_THREAD_SPECIFIC_MEMORY,
                (char*) &my_true);
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5434

unknown's avatar
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5435 5436
#ifdef HAVE_OPENSSL
  if (mi->ssl)
5437
  {
unknown's avatar
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5438
    mysql_ssl_set(mysql,
unknown's avatar
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5439
                  mi->ssl_key[0]?mi->ssl_key:0,
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unknown committed
5440
                  mi->ssl_cert[0]?mi->ssl_cert:0,
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5441 5442 5443
                  mi->ssl_ca[0]?mi->ssl_ca:0,
                  mi->ssl_capath[0]?mi->ssl_capath:0,
                  mi->ssl_cipher[0]?mi->ssl_cipher:0);
5444 5445 5446
    mysql_options(mysql, MYSQL_OPT_SSL_VERIFY_SERVER_CERT,
                  &mi->ssl_verify_server_cert);
  }
unknown's avatar
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5447 5448
#endif

5449 5450 5451 5452
  mysql_options(mysql, MYSQL_SET_CHARSET_NAME, default_charset_info->csname);
  /* This one is not strictly needed but we have it here for completeness */
  mysql_options(mysql, MYSQL_SET_CHARSET_DIR, (char *) charsets_dir);

5453 5454 5455 5456
  /* Set MYSQL_PLUGIN_DIR in case master asks for an external authentication plugin */
  if (opt_plugin_dir_ptr && *opt_plugin_dir_ptr)
    mysql_options(mysql, MYSQL_PLUGIN_DIR, opt_plugin_dir_ptr);

5457 5458 5459 5460 5461 5462 5463 5464 5465 5466
  /* we disallow empty users */
  if (mi->user == NULL || mi->user[0] == 0)
  {
    mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR,
               ER(ER_SLAVE_FATAL_ERROR),
               "Invalid (empty) username when attempting to "
               "connect to the master server. Connection attempt "
               "terminated.");
    DBUG_RETURN(1);
  }
5467
  while (!(slave_was_killed = io_slave_killed(thd,mi)) &&
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unknown committed
5468 5469 5470
         (reconnect ? mysql_reconnect(mysql) != 0 :
          mysql_real_connect(mysql, mi->host, mi->user, mi->password, 0,
                             mi->port, 0, client_flag) == 0))
unknown's avatar
unknown committed
5471
  {
5472
    /* Don't repeat last error */
unknown's avatar
SCRUM  
unknown committed
5473
    if ((int)mysql_errno(mysql) != last_errno)
5474
    {
unknown's avatar
SCRUM  
unknown committed
5475
      last_errno=mysql_errno(mysql);
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5476
      suppress_warnings= 0;
5477 5478
      mi->report(ERROR_LEVEL, last_errno,
                 "error %s to master '%s@%s:%d'"
5479
                 " - retry-time: %d  retries: %lu  message: %s",
5480 5481
                 (reconnect ? "reconnecting" : "connecting"),
                 mi->user, mi->host, mi->port,
5482 5483
                 mi->connect_retry, master_retry_count,
                 mysql_error(mysql));
5484
    }
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unknown committed
5485 5486 5487
    /*
      By default we try forever. The reason is that failure will trigger
      master election, so if the user did not set master_retry_count we
5488
      do not want to have election triggered on the first failure to
unknown's avatar
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5489
      connect
5490
    */
5491
    if (++err_count == master_retry_count)
5492 5493
    {
      slave_was_killed=1;
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unknown committed
5494 5495
      if (reconnect)
        change_rpl_status(RPL_ACTIVE_SLAVE,RPL_LOST_SOLDIER);
5496 5497
      break;
    }
5498
    slave_sleep(thd,mi->connect_retry,io_slave_killed, mi);
unknown's avatar
unknown committed
5499
  }
5500

5501 5502
  if (!slave_was_killed)
  {
5503
    mi->clear_error(); // clear possible left over reconnect error
unknown's avatar
unknown committed
5504
    if (reconnect)
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unknown committed
5505
    {
5506
      if (!suppress_warnings && global_system_variables.log_warnings)
unknown's avatar
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5507
        sql_print_information("Slave: connected to master '%s@%s:%d',\
5508
replication resumed in log '%s' at position %s", mi->user,
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5509 5510 5511
                        mi->host, mi->port,
                        IO_RPL_LOG_NAME,
                        llstr(mi->master_log_pos,llbuff));
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5512
    }
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5513 5514 5515
    else
    {
      change_rpl_status(RPL_IDLE_SLAVE,RPL_ACTIVE_SLAVE);
5516 5517
      general_log_print(thd, COM_CONNECT_OUT, "%s@%s:%d",
                        mi->user, mi->host, mi->port);
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unknown committed
5518
    }
5519
#ifdef SIGNAL_WITH_VIO_CLOSE
5520
    thd->set_active_vio(mysql->net.vio);
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5521
#endif
5522
  }
5523
  mysql->reconnect= 1;
5524 5525
  DBUG_PRINT("exit",("slave_was_killed: %d", slave_was_killed));
  DBUG_RETURN(slave_was_killed);
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5526 5527
}

5528

unknown's avatar
unknown committed
5529
/*
5530
  safe_reconnect()
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5531

unknown's avatar
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5532 5533 5534
  IMPLEMENTATION
    Try to connect until successful or slave killed or we have retried
    master_retry_count times
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5535 5536
*/

5537
static int safe_reconnect(THD* thd, MYSQL* mysql, Master_info* mi,
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5538
                          bool suppress_warnings)
unknown's avatar
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5539
{
unknown's avatar
unknown committed
5540 5541
  DBUG_ENTER("safe_reconnect");
  DBUG_RETURN(connect_to_master(thd, mysql, mi, 1, suppress_warnings));
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5542 5543
}

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5544

He Zhenxing's avatar
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MYSQL *rpl_connect_master(MYSQL *mysql)
{
  THD *thd= current_thd;
  Master_info *mi= my_pthread_getspecific_ptr(Master_info*, RPL_MASTER_INFO);
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  bool allocated= false;
  my_bool my_true= 1;

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  if (!mi)
  {
    sql_print_error("'rpl_connect_master' must be called in slave I/O thread context.");
    return NULL;
  }

  if (!mysql)
  {
    if(!(mysql= mysql_init(NULL)))
    {
      sql_print_error("rpl_connect_master: failed in mysql_init()");
      return NULL;
    }
    allocated= true;
  }

  /*
    XXX: copied from connect_to_master, this function should not
    change the slave status, so we cannot use connect_to_master
    directly
    
    TODO: make this part a seperate function to eliminate duplication
  */
  mysql_options(mysql, MYSQL_OPT_CONNECT_TIMEOUT, (char *) &slave_net_timeout);
  mysql_options(mysql, MYSQL_OPT_READ_TIMEOUT, (char *) &slave_net_timeout);
5577 5578
  mysql_options(mysql, MYSQL_OPT_USE_THREAD_SPECIFIC_MEMORY,
                (char*) &my_true);
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#ifdef HAVE_OPENSSL
  if (mi->ssl)
  {
    mysql_ssl_set(mysql,
                  mi->ssl_key[0]?mi->ssl_key:0,
                  mi->ssl_cert[0]?mi->ssl_cert:0,
                  mi->ssl_ca[0]?mi->ssl_ca:0,
                  mi->ssl_capath[0]?mi->ssl_capath:0,
                  mi->ssl_cipher[0]?mi->ssl_cipher:0);
    mysql_options(mysql, MYSQL_OPT_SSL_VERIFY_SERVER_CERT,
                  &mi->ssl_verify_server_cert);
  }
#endif

  mysql_options(mysql, MYSQL_SET_CHARSET_NAME, default_charset_info->csname);
  /* This one is not strictly needed but we have it here for completeness */
  mysql_options(mysql, MYSQL_SET_CHARSET_DIR, (char *) charsets_dir);

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  if (mi->user == NULL
      || mi->user[0] == 0
      || io_slave_killed(thd, mi)
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      || !mysql_real_connect(mysql, mi->host, mi->user, mi->password, 0,
                             mi->port, 0, 0))
  {
    if (!io_slave_killed(thd, mi))
      sql_print_error("rpl_connect_master: error connecting to master: %s (server_error: %d)",
                      mysql_error(mysql), mysql_errno(mysql));
    
    if (allocated)
      mysql_close(mysql);                       // this will free the object
    return NULL;
  }
  return mysql;
}

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/*
  Store the file and position where the execute-slave thread are in the
  relay log.

  SYNOPSIS
    flush_relay_log_info()
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    rli                 Relay log information
5622 5623

  NOTES
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    - As this is only called by the slave thread or on STOP SLAVE, with the
      log_lock grabbed and the slave thread stopped, we don't need to have 
      a lock here.
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    - If there is an active transaction, then we don't update the position
      in the relay log.  This is to ensure that we re-execute statements
      if we die in the middle of an transaction that was rolled back.
    - As a transaction never spans binary logs, we don't have to handle the
      case where we do a relay-log-rotation in the middle of the transaction.
      If this would not be the case, we would have to ensure that we
      don't delete the relay log file where the transaction started when
      we switch to a new relay log file.

  TODO
    - Change the log file information to a binary format to avoid calling
      longlong2str.

  RETURN VALUES
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    0   ok
    1   write error
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*/

5645
bool flush_relay_log_info(Relay_log_info* rli)
5646
{
5647
  bool error=0;
5648
  DBUG_ENTER("flush_relay_log_info");
5649 5650

  if (unlikely(rli->no_storage))
5651
    DBUG_RETURN(0);
5652

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  IO_CACHE *file = &rli->info_file;
  char buff[FN_REFLEN*2+22*2+4], *pos;

5656
  my_b_seek(file, 0L);
5657
  pos=strmov(buff, rli->group_relay_log_name);
5658
  *pos++='\n';
5659
  pos= longlong10_to_str(rli->group_relay_log_pos, pos, 10);
5660
  *pos++='\n';
5661
  pos=strmov(pos, rli->group_master_log_name);
5662
  *pos++='\n';
5663
  pos=longlong10_to_str(rli->group_master_log_pos, pos, 10);
5664
  *pos='\n';
5665
  if (my_b_write(file, (uchar*) buff, (size_t) (pos-buff)+1))
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    error=1;
  if (flush_io_cache(file))
    error=1;
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  if (sync_relayloginfo_period &&
      !error &&
      ++(rli->sync_counter) >= sync_relayloginfo_period)
  {
    if (my_sync(rli->info_fd, MYF(MY_WME)))
      error=1;
    rli->sync_counter= 0;
  }
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  /* 
    Flushing the relay log is done by the slave I/O thread 
    or by the user on STOP SLAVE. 
   */
5681
  DBUG_RETURN(error);
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}

5684

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/*
5686
  Called when we notice that the current "hot" log got rotated under our feet.
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*/

5689
static IO_CACHE *reopen_relay_log(Relay_log_info *rli, const char **errmsg)
5690
{
5691
  DBUG_ENTER("reopen_relay_log");
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  DBUG_ASSERT(rli->cur_log != &rli->cache_buf);
  DBUG_ASSERT(rli->cur_log_fd == -1);
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  IO_CACHE *cur_log = rli->cur_log=&rli->cache_buf;
5696
  if ((rli->cur_log_fd=open_binlog(cur_log,rli->event_relay_log_name,
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                                   errmsg)) <0)
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    DBUG_RETURN(0);
5699 5700
  /*
    We want to start exactly where we was before:
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    relay_log_pos       Current log pos
    pending             Number of bytes already processed from the event
5703
  */
5704
  rli->event_relay_log_pos= max(rli->event_relay_log_pos, BIN_LOG_HEADER_SIZE);
5705
  my_b_seek(cur_log,rli->event_relay_log_pos);
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  DBUG_RETURN(cur_log);
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}

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/**
  Reads next event from the relay log.  Should be called from the
  slave IO thread.

  @param rli Relay_log_info structure for the slave IO thread.

  @return The event read, or NULL on error.  If an error occurs, the
  error is reported through the sql_print_information() or
  sql_print_error() functions.
*/
5720
static Log_event* next_event(Relay_log_info* rli)
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{
  Log_event* ev;
  IO_CACHE* cur_log = rli->cur_log;
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  mysql_mutex_t *log_lock = rli->relay_log.get_log_lock();
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  const char* errmsg=0;
  THD* thd = rli->sql_thd;
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  DBUG_ENTER("next_event");
5728

5729 5730
  DBUG_ASSERT(thd != 0);

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#ifndef DBUG_OFF
  if (abort_slave_event_count && !rli->events_till_abort--)
    DBUG_RETURN(0);
#endif

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  /*
    For most operations we need to protect rli members with data_lock,
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    so we assume calling function acquired this mutex for us and we will
    hold it for the most of the loop below However, we will release it
    whenever it is worth the hassle,  and in the cases when we go into a
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    mysql_cond_wait() with the non-data_lock mutex
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  */
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  mysql_mutex_assert_owner(&rli->data_lock);
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5745
  while (!sql_slave_killed(thd,rli))
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  {
    /*
      We can have two kinds of log reading:
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      hot_log:
        rli->cur_log points at the IO_CACHE of relay_log, which
        is actively being updated by the I/O thread. We need to be careful
        in this case and make sure that we are not looking at a stale log that
        has already been rotated. If it has been, we reopen the log.

      The other case is much simpler:
        We just have a read only log that nobody else will be updating.
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    */
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    bool hot_log;
    if ((hot_log = (cur_log != &rli->cache_buf)))
    {
      DBUG_ASSERT(rli->cur_log_fd == -1); // foreign descriptor
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      mysql_mutex_lock(log_lock);
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5763 5764

      /*
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        Reading xxx_file_id is safe because the log will only
        be rotated when we hold relay_log.LOCK_log
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      */
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      if (rli->relay_log.get_open_count() != rli->cur_log_old_open_count)
5769
      {
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        // The master has switched to a new log file; Reopen the old log file
        cur_log=reopen_relay_log(rli, &errmsg);
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        mysql_mutex_unlock(log_lock);
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        if (!cur_log)                           // No more log files
          goto err;
        hot_log=0;                              // Using old binary log
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      }
    }
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    /* 
      As there is no guarantee that the relay is open (for example, an I/O
      error during a write by the slave I/O thread may have closed it), we
      have to test it.
    */
    if (!my_b_inited(cur_log))
      goto err;
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#ifndef DBUG_OFF
    {
5787
      /* This is an assertion which sometimes fails, let's try to track it */
5788
      char llbuf1[22], llbuf2[22];
5789
      DBUG_PRINT("info", ("my_b_tell(cur_log)=%s rli->event_relay_log_pos=%s",
5790
                          llstr(my_b_tell(cur_log),llbuf1),
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                          llstr(rli->event_relay_log_pos,llbuf2)));
      DBUG_ASSERT(my_b_tell(cur_log) >= BIN_LOG_HEADER_SIZE);
      DBUG_ASSERT(my_b_tell(cur_log) == rli->event_relay_log_pos);
5794 5795
    }
#endif
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    /*
      Relay log is always in new format - if the master is 3.23, the
5798
      I/O thread will convert the format for us.
5799 5800
      A problem: the description event may be in a previous relay log. So if
      the slave has been shutdown meanwhile, we would have to look in old relay
5801 5802
      logs, which may even have been deleted. So we need to write this
      description event at the beginning of the relay log.
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      When the relay log is created when the I/O thread starts, easy: the
      master will send the description event and we will queue it.
5805
      But if the relay log is created by new_file(): then the solution is:
5806
      MYSQL_BIN_LOG::open() will write the buffered description event.
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5807
    */
5808 5809 5810
    if ((ev= Log_event::read_log_event(cur_log,0,
                                       rli->relay_log.description_event_for_exec,
                                       opt_slave_sql_verify_checksum)))
5811

5812 5813
    {
      DBUG_ASSERT(thd==rli->sql_thd);
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      /*
        read it while we have a lock, to avoid a mutex lock in
        inc_event_relay_log_pos()
      */
      rli->future_event_relay_log_pos= my_b_tell(cur_log);
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      /*
        For GTID, allocate a new sub_id for the given domain_id.
        The sub_id must be allocated in increasing order of binlog order.
      */
      if (ev->get_type_code() == GTID_EVENT)
      {
        Gtid_log_event *gev= static_cast<Gtid_log_event *>(ev);
        uint64 sub_id= rpl_global_gtid_slave_state.next_subid(gev->domain_id);
        if (!sub_id)
        {
          errmsg = "slave SQL thread aborted because of out-of-memory error";
          if (hot_log)
            mysql_mutex_unlock(log_lock);
          goto err;
        }
        rli->gtid_sub_id= sub_id;
        rli->current_gtid.server_id= gev->server_id;
        rli->current_gtid.domain_id= gev->domain_id;
        rli->current_gtid.seq_no= gev->seq_no;
      }

5840
      if (hot_log)
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5841
        mysql_mutex_unlock(log_lock);
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5842
      DBUG_RETURN(ev);
5843 5844
    }
    DBUG_ASSERT(thd==rli->sql_thd);
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5845
    if (opt_reckless_slave)                     // For mysql-test
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      cur_log->error = 0;
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5847
    if (cur_log->error < 0)
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    {
      errmsg = "slave SQL thread aborted because of I/O error";
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5850
      if (hot_log)
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5851
        mysql_mutex_unlock(log_lock);
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      goto err;
    }
5854 5855
    if (!cur_log->error) /* EOF */
    {
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5856
      /*
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        On a hot log, EOF means that there are no more updates to
        process and we must block until I/O thread adds some and
        signals us to continue
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      */
5861 5862
      if (hot_log)
      {
5863 5864 5865 5866 5867 5868 5869 5870 5871 5872
        /*
          We say in Seconds_Behind_Master that we have "caught up". Note that
          for example if network link is broken but I/O slave thread hasn't
          noticed it (slave_net_timeout not elapsed), then we'll say "caught
          up" whereas we're not really caught up. Fixing that would require
          internally cutting timeout in smaller pieces in network read, no
          thanks. Another example: SQL has caught up on I/O, now I/O has read
          a new event and is queuing it; the false "0" will exist until SQL
          finishes executing the new event; it will be look abnormal only if
          the events have old timestamps (then you get "many", 0, "many").
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          Transient phases like this can be fixed with implemeting
          Heartbeat event which provides the slave the status of the
          master at time the master does not have any new update to send.
          Seconds_Behind_Master would be zero only when master has no
          more updates in binlog for slave. The heartbeat can be sent
          in a (small) fraction of slave_net_timeout. Until it's done
          rli->last_master_timestamp is temporarely (for time of
          waiting for the following event) reset whenever EOF is
          reached.
5883
        */
5884
        time_t save_timestamp= rli->last_master_timestamp;
5885 5886
        rli->last_master_timestamp= 0;

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5887
        DBUG_ASSERT(rli->relay_log.get_open_count() ==
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5888
                    rli->cur_log_old_open_count);
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        if (rli->ign_master_log_name_end[0])
        {
          /* We generate and return a Rotate, to make our positions advance */
          DBUG_PRINT("info",("seeing an ignored end segment"));
5894
          ev= new Rotate_log_event(rli->ign_master_log_name_end,
5895
                                   0, rli->ign_master_log_pos_end,
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5896
                                   Rotate_log_event::DUP_NAME);
5897
          rli->ign_master_log_name_end[0]= 0;
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5898
          mysql_mutex_unlock(log_lock);
5899 5900 5901 5902 5903 5904 5905 5906 5907 5908
          if (unlikely(!ev))
          {
            errmsg= "Slave SQL thread failed to create a Rotate event "
              "(out of memory?), SHOW SLAVE STATUS may be inaccurate";
            goto err;
          }
          ev->server_id= 0; // don't be ignored by slave SQL thread
          DBUG_RETURN(ev);
        }

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        /*
          We can, and should release data_lock while we are waiting for
          update. If we do not, show slave status will block
        */
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5913
        mysql_mutex_unlock(&rli->data_lock);
5914 5915

        /*
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5916
          Possible deadlock :
5917 5918 5919 5920 5921 5922 5923 5924 5925 5926 5927
          - the I/O thread has reached log_space_limit
          - the SQL thread has read all relay logs, but cannot purge for some
          reason:
            * it has already purged all logs except the current one
            * there are other logs than the current one but they're involved in
            a transaction that finishes in the current one (or is not finished)
          Solution :
          Wake up the possibly waiting I/O thread, and set a boolean asking
          the I/O thread to temporarily ignore the log_space_limit
          constraint, because we do not want the I/O thread to block because of
          space (it's ok if it blocks for any other reason (e.g. because the
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5928
          master does not send anything). Then the I/O thread stops waiting
5929 5930 5931 5932 5933 5934 5935 5936 5937 5938
          and reads one more event and starts honoring log_space_limit again.

          If the SQL thread needs more events to be able to rotate the log (it
          might need to finish the current group first), then it can ask for one
          more at a time. Thus we don't outgrow the relay log indefinitely,
          but rather in a controlled manner, until the next rotate.

          When the SQL thread starts it sets ignore_log_space_limit to false. 
          We should also reset ignore_log_space_limit to 0 when the user does 
          RESET SLAVE, but in fact, no need as RESET SLAVE requires that the slave
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5939 5940
          be stopped, and the SQL thread sets ignore_log_space_limit to 0 when
          it stops.
5941
        */
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5942
        mysql_mutex_lock(&rli->log_space_lock);
5943 5944 5945 5946 5947 5948 5949 5950 5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965 5966 5967

        /* 
          If we have reached the limit of the relay space and we
          are going to sleep, waiting for more events:

          1. If outside a group, SQL thread asks the IO thread 
             to force a rotation so that the SQL thread purges 
             logs next time it processes an event (thus space is
             freed).

          2. If in a group, SQL thread asks the IO thread to 
             ignore the limit and queues yet one more event 
             so that the SQL thread finishes the group and 
             is are able to rotate and purge sometime soon.
         */
        if (rli->log_space_limit && 
            rli->log_space_limit < rli->log_space_total)
        {
          /* force rotation if not in an unfinished group */
          rli->sql_force_rotate_relay= !rli->is_in_group();

          /* ask for one more event */
          rli->ignore_log_space_limit= true;
        }

5968
        /*
5969 5970 5971 5972
          If the I/O thread is blocked, unblock it.  Ok to broadcast
          after unlock, because the mutex is only destroyed in
          ~Relay_log_info(), i.e. when rli is destroyed, and rli will
          not be destroyed before we exit the present function.
5973
        */
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5974 5975
        mysql_mutex_unlock(&rli->log_space_lock);
        mysql_cond_broadcast(&rli->log_space_cond);
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Andrei Elkin committed
5976 5977
        // Note that wait_for_update_relay_log unlocks lock_log !
        rli->relay_log.wait_for_update_relay_log(rli->sql_thd);
5978
        // re-acquire data lock since we released it earlier
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5979
        mysql_mutex_lock(&rli->data_lock);
5980
        rli->last_master_timestamp= save_timestamp;
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        continue;
5982
      }
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5983
      /*
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5984 5985 5986
        If the log was not hot, we need to move to the next log in
        sequence. The next log could be hot or cold, we deal with both
        cases separately after doing some common initialization
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      */
      end_io_cache(cur_log);
      DBUG_ASSERT(rli->cur_log_fd >= 0);
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5990
      mysql_file_close(rli->cur_log_fd, MYF(MY_WME));
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      rli->cur_log_fd = -1;
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5992

5993
      if (relay_log_purge)
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      {
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5995
        /*
5996 5997 5998 5999 6000 6001 6002 6003 6004 6005
          purge_first_log will properly set up relay log coordinates in rli.
          If the group's coordinates are equal to the event's coordinates
          (i.e. the relay log was not rotated in the middle of a group),
          we can purge this relay log too.
          We do ulonglong and string comparisons, this may be slow but
          - purging the last relay log is nice (it can save 1GB of disk), so we
          like to detect the case where we can do it, and given this,
          - I see no better detection method
          - purge_first_log is not called that often
        */
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        if (rli->relay_log.purge_first_log
6007 6008 6009
            (rli,
             rli->group_relay_log_pos == rli->event_relay_log_pos
             && !strcmp(rli->group_relay_log_name,rli->event_relay_log_name)))
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        {
          errmsg = "Error purging processed logs";
          goto err;
        }
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      }
6015 6016
      else
      {
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        /*
          If hot_log is set, then we already have a lock on
          LOCK_log.  If not, we have to get the lock.

          According to Sasha, the only time this code will ever be executed
          is if we are recovering from a bug.
        */
        if (rli->relay_log.find_next_log(&rli->linfo, !hot_log))
        {
          errmsg = "error switching to the next log";
          goto err;
        }
        rli->event_relay_log_pos = BIN_LOG_HEADER_SIZE;
6030
        strmake_buf(rli->event_relay_log_name,rli->linfo.log_file_name);
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        flush_relay_log_info(rli);
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      }
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      /*
        Now we want to open this next log. To know if it's a hot log (the one
        being written by the I/O thread now) or a cold log, we can use
        is_active(); if it is hot, we use the I/O cache; if it's cold we open
        the file normally. But if is_active() reports that the log is hot, this
        may change between the test and the consequence of the test. So we may
        open the I/O cache whereas the log is now cold, which is nonsense.
        To guard against this, we need to have LOCK_log.
      */

      DBUG_PRINT("info",("hot_log: %d",hot_log));
      if (!hot_log) /* if hot_log, we already have this mutex */
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        mysql_mutex_lock(log_lock);
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      if (rli->relay_log.is_active(rli->linfo.log_file_name))
      {
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        rli->cur_log= cur_log= rli->relay_log.get_log_file();
        rli->cur_log_old_open_count= rli->relay_log.get_open_count();
        DBUG_ASSERT(rli->cur_log_fd == -1);

        /*
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           When the SQL thread is [stopped and] (re)started the
           following may happen:

           1. Log was hot at stop time and remains hot at restart

              SQL thread reads again from hot_log (SQL thread was
              reading from the active log when it was stopped and the
              very same log is still active on SQL thread restart).

              In this case, my_b_seek is performed on cur_log, while
              cur_log points to relay_log.get_log_file();

           2. Log was hot at stop time but got cold before restart

              The log was hot when SQL thread stopped, but it is not
              anymore when the SQL thread restarts.

              In this case, the SQL thread reopens the log, using
              cache_buf, ie, cur_log points to &cache_buf, and thence
              its coordinates are reset.

           3. Log was already cold at stop time

              The log was not hot when the SQL thread stopped, and, of
              course, it will not be hot when it restarts.

              In this case, the SQL thread opens the cold log again,
              using cache_buf, ie, cur_log points to &cache_buf, and
              thence its coordinates are reset.

           4. Log was hot at stop time, DBA changes to previous cold
              log and restarts SQL thread

              The log was hot when the SQL thread was stopped, but the
              user changed the coordinates of the SQL thread to
              restart from a previous cold log.

              In this case, at start time, cur_log points to a cold
              log, opened using &cache_buf as cache, and coordinates
              are reset. However, as it moves on to the next logs, it
              will eventually reach the hot log. If the hot log is the
              same at the time the SQL thread was stopped, then
              coordinates were not reset - the cur_log will point to
              relay_log.get_log_file(), and not a freshly opened
              IO_CACHE through cache_buf. For this reason we need to
              deploy a my_b_seek before calling check_binlog_magic at
              this point of the code (see: BUG#55263 for more
              details).
          
          NOTES: 
            - We must keep the LOCK_log to read the 4 first bytes, as
              this is a hot log (same as when we call read_log_event()
              above: for a hot log we take the mutex).

            - Because of scenario #4 above, we need to have a
              my_b_seek here. Otherwise, we might hit the assertion
              inside check_binlog_magic.
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        */
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        my_b_seek(cur_log, (my_off_t) 0);
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        if (check_binlog_magic(cur_log,&errmsg))
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        {
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          if (!hot_log)
            mysql_mutex_unlock(log_lock);
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          goto err;
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        }
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        if (!hot_log)
          mysql_mutex_unlock(log_lock);
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        continue;
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      }
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      if (!hot_log)
        mysql_mutex_unlock(log_lock);
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      /*
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        if we get here, the log was not hot, so we will have to open it
        ourselves. We are sure that the log is still not hot now (a log can get
        from hot to cold, but not from cold to hot). No need for LOCK_log.
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      */
      // open_binlog() will check the magic header
      if ((rli->cur_log_fd=open_binlog(cur_log,rli->linfo.log_file_name,
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                                       &errmsg)) <0)
        goto err;
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    }
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    else
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    {
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      /*
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        Read failed with a non-EOF error.
        TODO: come up with something better to handle this error
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      */
      if (hot_log)
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        mysql_mutex_unlock(log_lock);
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      sql_print_error("Slave SQL thread: I/O error reading \
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event(errno: %d  cur_log->error: %d)",
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                      my_errno,cur_log->error);
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      // set read position to the beginning of the event
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      my_b_seek(cur_log,rli->event_relay_log_pos);
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      /* otherwise, we have had a partial read */
      errmsg = "Aborting slave SQL thread because of partial event read";
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      break;                                    // To end of function
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    }
  }
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  if (!errmsg && global_system_variables.log_warnings)
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  {
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    sql_print_information("Error reading relay log event: %s",
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                          "slave SQL thread was killed");
    DBUG_RETURN(0);
  }
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err:
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  if (errmsg)
    sql_print_error("Error reading relay log event: %s", errmsg);
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  DBUG_RETURN(0);
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}

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/*
  Rotate a relay log (this is used only by FLUSH LOGS; the automatic rotation
  because of size is simpler because when we do it we already have all relevant
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  locks; here we don't, so this function is mainly taking locks).
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  Returns nothing as we cannot catch any error (MYSQL_BIN_LOG::new_file()
  is void).
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*/

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int rotate_relay_log(Master_info* mi)
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{
  DBUG_ENTER("rotate_relay_log");
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  Relay_log_info* rli= &mi->rli;
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  int error= 0;
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  DBUG_EXECUTE_IF("crash_before_rotate_relaylog", DBUG_SUICIDE(););
6182

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  /*
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     We need to test inited because otherwise, new_file() will attempt to lock
     LOCK_log, which may not be inited (if we're not a slave).
  */
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  if (!rli->inited)
  {
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    DBUG_PRINT("info", ("rli->inited == 0"));
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    goto end;
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  }
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  /* If the relay log is closed, new_file() will do nothing. */
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  if ((error= rli->relay_log.new_file()))
    goto end;
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  /*
    We harvest now, because otherwise BIN_LOG_HEADER_SIZE will not immediately
    be counted, so imagine a succession of FLUSH LOGS  and assume the slave
    threads are started:
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    relay_log_space decreases by the size of the deleted relay log, but does
    not increase, so flush-after-flush we may become negative, which is wrong.
    Even if this will be corrected as soon as a query is replicated on the
    slave (because the I/O thread will then call harvest_bytes_written() which
    will harvest all these BIN_LOG_HEADER_SIZE we forgot), it may give strange
    output in SHOW SLAVE STATUS meanwhile. So we harvest now.
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    If the log is closed, then this will just harvest the last writes, probably
    0 as they probably have been harvested.
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    Note that it needs to be protected by mi->data_lock.
6211
  */
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  mysql_mutex_assert_owner(&mi->data_lock);
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  rli->relay_log.harvest_bytes_written(&rli->log_space_total);
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end:
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  DBUG_RETURN(error);
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}

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/**
   Detects, based on master's version (as found in the relay log), if master
   has a certain bug.
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   @param rli Relay_log_info which tells the master's version
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   @param bug_id Number of the bug as found in bugs.mysql.com
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   @param report bool report error message, default TRUE
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   @param pred Predicate function that will be called with @c param to
   check for the bug. If the function return @c true, the bug is present,
   otherwise, it is not.

   @param param  State passed to @c pred function.

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   @return TRUE if master has the bug, FALSE if it does not.
*/
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bool rpl_master_has_bug(const Relay_log_info *rli, uint bug_id, bool report,
                        bool (*pred)(const void *), const void *param)
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{
  struct st_version_range_for_one_bug {
    uint        bug_id;
    const uchar introduced_in[3]; // first version with bug
    const uchar fixed_in[3];      // first version with fix
  };
  static struct st_version_range_for_one_bug versions_for_all_bugs[]=
  {
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    {24432, { 5, 0, 24 }, { 5, 0, 38 } },
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    {24432, { 5, 1, 12 }, { 5, 1, 17 } },
    {33029, { 5, 0,  0 }, { 5, 0, 58 } },
    {33029, { 5, 1,  0 }, { 5, 1, 12 } },
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    {37426, { 5, 1,  0 }, { 5, 1, 26 } },
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  };
  const uchar *master_ver=
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    rli->relay_log.description_event_for_exec->server_version_split.ver;
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6253
  DBUG_ASSERT(sizeof(rli->relay_log.description_event_for_exec->server_version_split.ver) == 3);
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  for (uint i= 0;
       i < sizeof(versions_for_all_bugs)/sizeof(*versions_for_all_bugs);i++)
  {
    const uchar *introduced_in= versions_for_all_bugs[i].introduced_in,
      *fixed_in= versions_for_all_bugs[i].fixed_in;
    if ((versions_for_all_bugs[i].bug_id == bug_id) &&
        (memcmp(introduced_in, master_ver, 3) <= 0) &&
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        (memcmp(fixed_in,      master_ver, 3) >  0) &&
        (pred == NULL || (*pred)(param)))
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    {
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      if (!report)
	return TRUE;
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      // a short message for SHOW SLAVE STATUS (message length constraints)
      my_printf_error(ER_UNKNOWN_ERROR, "master may suffer from"
                      " http://bugs.mysql.com/bug.php?id=%u"
                      " so slave stops; check error log on slave"
                      " for more info", MYF(0), bug_id);
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      // a verbose message for the error log
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      rli->report(ERROR_LEVEL, ER_UNKNOWN_ERROR,
                  "According to the master's version ('%s'),"
                  " it is probable that master suffers from this bug:"
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                      " http://bugs.mysql.com/bug.php?id=%u"
                      " and thus replicating the current binary log event"
                      " may make the slave's data become different from the"
                      " master's data."
                      " To take no risk, slave refuses to replicate"
                      " this event and stops."
                      " We recommend that all updates be stopped on the"
                      " master and slave, that the data of both be"
                      " manually synchronized,"
                      " that master's binary logs be deleted,"
                      " that master be upgraded to a version at least"
                      " equal to '%d.%d.%d'. Then replication can be"
                      " restarted.",
                      rli->relay_log.description_event_for_exec->server_version,
                      bug_id,
                      fixed_in[0], fixed_in[1], fixed_in[2]);
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      return TRUE;
    }
  }
  return FALSE;
}

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/**
   BUG#33029, For all 5.0 up to 5.0.58 exclusive, and 5.1 up to 5.1.12
   exclusive, if one statement in a SP generated AUTO_INCREMENT value
   by the top statement, all statements after it would be considered
   generated AUTO_INCREMENT value by the top statement, and a
   erroneous INSERT_ID value might be associated with these statement,
   which could cause duplicate entry error and stop the slave.

   Detect buggy master to work around.
 */
bool rpl_master_erroneous_autoinc(THD *thd)
{
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  if (thd->rli_slave)
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  {
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    DBUG_EXECUTE_IF("simulate_bug33029", return TRUE;);
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    return rpl_master_has_bug(thd->rli_slave, 33029, FALSE, NULL, NULL);
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  }
  return FALSE;
}

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/**
  @} (end of group Replication)
*/

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#endif /* HAVE_REPLICATION */