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/* Copyright (C) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
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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
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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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typedef bool (*CHECK_KILLED_FUNC)(THD*,void*);

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char* slave_load_tmpdir = 0;
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Master_info *active_mi= 0;
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my_bool replicate_same_server_id;
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ulonglong relay_log_space_limit = 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",
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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",
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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",
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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, 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 int safe_sleep(THD* thd, int sec, CHECK_KILLED_FUNC thread_killed,
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                      void* thread_killed_arg);
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static int get_master_version_and_clock(MYSQL* mysql, Master_info* mi);
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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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/*
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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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/* 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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  /*
    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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  /*
    TODO: re-write this to interate through the list of files
    for multi-master
  */
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  active_mi= new Master_info(relay_log_recovery);
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  if (pthread_key_create(&RPL_MASTER_INFO, NULL))
    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 (!active_mi)
  {
    sql_print_error("Failed to allocate memory for the master info structure");
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    error= 1;
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    goto err;
  }
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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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    error= 1;
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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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      error= 1;
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      goto err;
    }
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  }

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err:
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  mysql_mutex_unlock(&LOCK_active_mi);
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  DBUG_RETURN(error);
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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);
    strmake(mi->master_log_name, rli->group_master_log_name,
            sizeof(mi->master_log_name)-1);
 
    sql_print_warning("Recovery from master pos %ld and file %s.",
                      (ulong) mi->master_log_pos, mi->master_log_name);
 
    strmake(rli->group_relay_log_name, rli->relay_log.get_log_fname(),
            sizeof(rli->group_relay_log_name)-1);
    strmake(rli->event_relay_log_name, rli->relay_log.get_log_fname(),
            sizeof(mi->rli.event_relay_log_name)-1);
 
    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);

    DBUG_PRINT("info",("Flushing relay-log info file."));
    if (current_thd)
      thd_proc_info(current_thd, "Flushing relay-log info file.");
    if (flush_relay_log_info(&mi->rli))
      DBUG_RETURN(ER_ERROR_DURING_FLUSH_LOGS);
    
    if (my_sync(mi->rli.info_fd, MYF(MY_WME)))
      DBUG_RETURN(ER_ERROR_DURING_FLUSH_LOGS);

    mysql_mutex_unlock(log_lock);
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  }
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  if (thread_mask & (SLAVE_IO|SLAVE_FORCE_ALL))
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  {
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    DBUG_PRINT("info",("Terminating IO thread"));
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    mi->abort_slave=1;
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    if ((error=terminate_slave_thread(mi->io_thd, io_lock,
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                                      &mi->stop_cond,
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                                      &mi->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 and master info file."));
    if (current_thd)
      thd_proc_info(current_thd, "Flushing relay log and master info files.");
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    if (flush_master_info(mi, TRUE, FALSE))
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      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)))
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      DBUG_RETURN(ER_ERROR_DURING_FLUSH_LOGS);

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

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    mysql_mutex_unlock(log_lock);
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  }
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  DBUG_RETURN(0); 
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}

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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.
591

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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.
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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)
603
{
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  DBUG_ENTER("terminate_slave_thread");
605
  if (!skip_lock)
606
  {
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    mysql_mutex_lock(term_lock);
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  }
  else
  {
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    mysql_mutex_assert_owner(term_lock);
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  }
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  if (!*slave_running)
  {
    if (!skip_lock)
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    {
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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
    {
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      DBUG_RETURN(ER_SLAVE_NOT_RUNNING);
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    }
  }
  DBUG_ASSERT(thd != 0);
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  THD_CHECK_SENTRY(thd);
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  /*
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    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
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  */
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  while (*slave_running)                        // Should always be true
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  {
639
    int error;
640
    DBUG_PRINT("loop", ("killing slave thread"));
641

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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)
    */
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    int err __attribute__((unused))= pthread_kill(thd->real_id, thr_client_alarm);
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    DBUG_ASSERT(err != EINVAL);
#endif
    thd->awake(THD::NOT_KILLED);
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    mysql_mutex_unlock(&thd->LOCK_thd_data);
654

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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
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    */
    struct timespec abstime;
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    set_timespec(abstime,2);
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    error= mysql_cond_timedwait(term_cond, term_lock, &abstime);
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    DBUG_ASSERT(error == ETIMEDOUT || error == 0);
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  }
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  DBUG_ASSERT(*slave_running == 0);

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

672

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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)
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{
  pthread_t th;
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  ulong start_id;
  DBUG_ENTER("start_slave_thread");

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  DBUG_ASSERT(mi->inited);

690
  if (start_lock)
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    mysql_mutex_lock(start_lock);
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  if (!server_id)
  {
    if (start_cond)
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      mysql_cond_broadcast(start_cond);
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    if (start_lock)
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      mysql_mutex_unlock(start_lock);
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    sql_print_error("Server id not set, will not start slave");
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    DBUG_RETURN(ER_BAD_SLAVE);
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  }
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702
  if (*slave_running)
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  {
    if (start_cond)
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      mysql_cond_broadcast(start_cond);
706
    if (start_lock)
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      mysql_mutex_unlock(start_lock);
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    DBUG_RETURN(ER_SLAVE_MUST_STOP);
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  }
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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))
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  {
    if (start_lock)
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      mysql_mutex_unlock(start_lock);
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    DBUG_RETURN(ER_SLAVE_THREAD);
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  }
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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)
723
    {
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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);
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      thd->exit_cond(old_msg);
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      mysql_mutex_lock(cond_lock); // re-acquire it as exit_cond() released
738
      if (thd->killed)
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      {
        if (start_lock)
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          mysql_mutex_unlock(start_lock);
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        DBUG_RETURN(thd->killed_errno());
743
      }
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    }
  }
  if (start_lock)
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    mysql_mutex_unlock(start_lock);
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  DBUG_RETURN(0);
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}
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751

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/*
753
  start_slave_threads()
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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
759
*/
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761
int start_slave_threads(bool need_slave_mutex, bool wait_for_start,
762
                        Master_info* mi, const char* master_info_fname,
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                        const char* slave_info_fname, int thread_mask)
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{
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  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;
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  int error=0;
768
  DBUG_ENTER("start_slave_threads");
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  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;
  }
782 783

  if (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);
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  if (!error && (thread_mask & SLAVE_SQL))
793
  {
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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);
802
    if (error)
803
      terminate_slave_threads(mi, thread_mask & SLAVE_IO, !need_slave_mutex);
804
  }
805
  DBUG_RETURN(error);
806
}
807

808

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/*
810
  Release slave threads at time of executing shutdown.
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  SYNOPSIS
    end_slave()
*/
815

816 817
void end_slave()
{
818 819
  DBUG_ENTER("end_slave");

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  /*
    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.
  */
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  mysql_mutex_lock(&LOCK_active_mi);
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  if (active_mi)
  {
    /*
      TODO: replace the line below with
      list_walk(&master_list, (list_walk_action)end_slave_on_walk,0);
      once multi-master code is ready.
    */
    terminate_slave_threads(active_mi,SLAVE_FORCE_ALL);
836
  }
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  mysql_mutex_unlock(&LOCK_active_mi);
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  DBUG_VOID_RETURN;
}

/**
   Free all resources used by slave threads at time of executing shutdown.
   The routine must be called after all possible users of @c active_mi
   have left.

   SYNOPSIS
     close_active_mi()

*/
void close_active_mi()
{
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  mysql_mutex_lock(&LOCK_active_mi);
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  if (active_mi)
  {
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    end_master_info(active_mi);
    delete active_mi;
    active_mi= 0;
  }
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  mysql_mutex_unlock(&LOCK_active_mi);
860
}
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862
static bool io_slave_killed(THD* thd, Master_info* mi)
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{
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  DBUG_ENTER("io_slave_killed");

866
  DBUG_ASSERT(mi->io_thd == thd);
867
  DBUG_ASSERT(mi->slave_running); // tracking buffer overrun
868
  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.
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   @param thd   pointer to a THD instance
   @param rli   pointer to Relay_log_info instance
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   @return TRUE the killed status is recognized, FALSE a possible killed
           status is deferred.
*/
884
static bool sql_slave_killed(THD* thd, Relay_log_info* rli)
885
{
886
  bool ret= FALSE;
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  DBUG_ENTER("sql_slave_killed");

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  DBUG_ASSERT(rli->sql_thd == thd);
  DBUG_ASSERT(rli->slave_running == 1);// tracking buffer overrun
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  if (abort_loop || thd->killed || rli->abort_slave)
  {
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    /*
      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())
904
    {
905
      char msg_stopped[]=
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        "... 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 "
910 911 912 913 914
        "ignores duplicate key, key not found, and similar errors (see "
        "documentation for details).";

      if (rli->abort_slave)
      {
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        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 ... "));
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        /*
          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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    }
  }
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  if (ret)
    rli->last_event_start_time= 0;
  
  DBUG_RETURN(ret);
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}

969

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/*
971 972
  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)
{
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  DBUG_ENTER("skip_load_data_infile");

981
  (void)net_request_file(net, "/dev/null");
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  (void)my_net_read(net);                               // discard response
983
  (void)net_write_command(net, 0, (uchar*) "", 0, (uchar*) "", 0); // ok
984
  DBUG_VOID_RETURN;
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}

987

988
bool net_request_file(NET* net, const char* fname)
989
{
990
  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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}

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/*
  From other comments and tests in code, it looks like
997
  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).
*/
1001 1002

const char *print_slave_db_safe(const char* db)
1003
{
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  DBUG_ENTER("*print_slave_db_safe");

  DBUG_RETURN((db ? db : ""));
1007
}
1008

1009
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;
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      while (((c=my_b_get(f)) != '\n' && c != my_b_EOF)) ;
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    }
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    DBUG_RETURN(0);
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  }
  else if (default_val)
  {
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    strmake(var,  default_val, max_size-1);
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    DBUG_RETURN(0);
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  }
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  DBUG_RETURN(1);
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}

1039

1040
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 ||
1132
        ((snd_size + 1 == max_size - read_size) &&  buf[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)
1164
    my_free(buf_act);
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  DBUG_RETURN(ret);
}


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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 ||
      errorno == ER_SERVER_SHUTDOWN)
    return TRUE;

  return FALSE;   
}


1191 1192 1193 1194 1195 1196 1197 1198
/*
  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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1200 1201 1202
  RETURNS
  0       ok
  1       error
1203
  2       transient network problem, the caller should try to reconnect
1204
*/
1205

1206
static int get_master_version_and_clock(MYSQL* mysql, Master_info* mi)
1207
{
1208
  char err_buff[MAX_SLAVE_ERRMSG];
1209
  const char* errmsg= 0;
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  int err_code= 0;
  MYSQL_RES *master_res= 0;
  MYSQL_ROW master_row;
1213
  DBUG_ENTER("get_master_version_and_clock");
1214 1215 1216 1217 1218 1219 1220

  /*
    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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1222
  if (!my_isdigit(&my_charset_bin,*mysql->server_version))
1223
  {
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    errmsg = "Master reported unrecognized MySQL version";
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    err_code= ER_SLAVE_FATAL_ERROR;
    sprintf(err_buff, ER(err_code), errmsg);
  }
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  else
  {
    /*
      Note the following switch will bug when we have MySQL branch 30 ;)
    */
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    switch (*mysql->server_version)
1234 1235 1236 1237 1238
    {
    case '0':
    case '1':
    case '2':
      errmsg = "Master reported unrecognized MySQL version";
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      err_code= ER_SLAVE_FATAL_ERROR;
      sprintf(err_buff, ER(err_code), errmsg);
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      break;
    case '3':
      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;
    case '4':
      mi->rli.relay_log.description_event_for_queue= new
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        Format_description_log_event(3, mysql->server_version);
1249
      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;
    }
1263
  }
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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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1272
  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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  /*
    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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  DBUG_EXECUTE_IF("dbug.before_get_UNIX_TIMESTAMP",
                  {
                    const char act[]=
                      "now "
                      "wait_for signal.get_unix_timestamp";
                    DBUG_ASSERT(opt_debug_sync_timeout > 0);
                    DBUG_ASSERT(!debug_sync_set_action(current_thd,
                                                       STRING_WITH_LEN(act)));
                  };);

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  master_res= NULL;
1300
  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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  {
1317
    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));
1322 1323
  }
  if (master_res)
1324
  {
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    mysql_free_result(master_res);
1326 1327
    master_res= NULL;
  }
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1329 1330 1331 1332 1333 1334 1335 1336 1337 1338
  /*
    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.
  */
1339 1340 1341 1342 1343 1344 1345 1346 1347
  DBUG_EXECUTE_IF("dbug.before_get_SERVER_ID",
                  {
                    const char act[]=
                      "now "
                      "wait_for signal.get_server_id";
                    DBUG_ASSERT(opt_debug_sync_timeout > 0);
                    DBUG_ASSERT(!debug_sync_set_action(current_thd, 
                                                       STRING_WITH_LEN(act)));
                  };);
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  master_res= NULL;
  master_row= NULL;
1350 1351
  if (!mysql_real_query(mysql,
                        STRING_WITH_LEN("SHOW VARIABLES LIKE 'SERVER_ID'")) &&
1352 1353
      (master_res= mysql_store_result(mysql)) &&
      (master_row= mysql_fetch_row(master_res)))
1354
  {
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1355
    if ((::server_id == (mi->master_id= strtoul(master_row[1], 0, 10))) &&
1356
        !mi->rli.replicate_same_server_id)
1357
    {
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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);
1364
      goto err;
1365
    }
1366 1367 1368
  }
  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)
  {
1392
    mysql_free_result(master_res);
1393
    master_res= NULL;
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1394
  }
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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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1403 1404 1405
  /*
    Check that the master's global character_set_server and ours are the same.
    Not fatal if query fails (old master?).
1406 1407 1408 1409 1410 1411
    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.
1418
  */
1419 1420 1421

  /* redundant with rest of code but safer against later additions */
  if (*mysql->server_version == '3')
1422
    goto err;
1423

1424
  if (*mysql->server_version == '4')
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1425
  {
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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)))
1431
    {
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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 \
1435
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;
      }
1441
    }
1442 1443
    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));
1457
      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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  }
1471

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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
1483
    '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).
1486
  */
1487
  if (*mysql->server_version == '4')
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1488
  {
1489 1490 1491 1492
    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)))
1493
    {
1494 1495 1496 1497
      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;
      }
1504
    }
1505 1506
    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 TIME_ZONE 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 try to get the value of TIME_ZONE global variable from master.";
      err_code= mysql_errno(mysql);
      sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
1520
      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);
1538
    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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1543 1544
      errmsg= "The slave I/O thread stops because SET @master_heartbeat_period "
        "on master failed.";
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1545
      err_code= ER_SLAVE_FATAL_ERROR;
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1546
      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));
  }
 

1554
err:
1555 1556
  if (errmsg)
  {
1557 1558
    if (master_res)
      mysql_free_result(master_res);
1559
    DBUG_ASSERT(err_code != 0);
1560
    mi->report(ERROR_LEVEL, err_code, "%s", err_buff);
1561
    DBUG_RETURN(1);
1562
  }
1563

1564
  DBUG_RETURN(0);
1565 1566 1567 1568 1569

network_err:
  if (master_res)
    mysql_free_result(master_res);
  DBUG_RETURN(2);
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1571 1572 1573 1574
slave_killed_err:
  if (master_res)
    mysql_free_result(master_res);
  DBUG_RETURN(2);
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}
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1576

1577
static bool wait_for_relay_log_space(Relay_log_info* rli)
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1578
{
1579
  bool slave_killed=0;
1580
  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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1585
  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,
                                  "\
1589
Waiting for the slave SQL thread to free enough relay log space");
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1590
  while (rli->log_space_limit < rli->log_space_total &&
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         !(slave_killed=io_slave_killed(thd,mi)) &&
1592
         !rli->ignore_log_space_limit)
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1593
    mysql_cond_wait(&rli->log_space_cond, &rli->log_space_lock);
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  thd->exit_cond(save_proc_info);
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  DBUG_RETURN(slave_killed);
}
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1599 1600
/*
  Builds a Rotate from the ignored events' info and writes it to relay log.
1601

1602 1603 1604 1605 1606 1607 1608 1609 1610 1611
  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).
 */
1612
static void write_ignored_events_info_to_relay_log(THD *thd, Master_info *mi)
1613
{
1614
  Relay_log_info *rli= &mi->rli;
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1615
  mysql_mutex_t *log_lock= rli->relay_log.get_log_lock();
1616 1617
  DBUG_ENTER("write_ignored_events_info_to_relay_log");

1618
  DBUG_ASSERT(thd == mi->io_thd);
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1619
  mysql_mutex_lock(log_lock);
1620
  if (rli->ign_master_log_name_end[0])
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1621
  {
1622
    DBUG_PRINT("info",("writing a Rotate event to track down ignored events"));
1623
    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");
1638
      rli->relay_log.harvest_bytes_written(&rli->log_space_total);
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      if (flush_master_info(mi, TRUE, TRUE))
1640
        sql_print_error("Failed to flush master info file");
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      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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1648
  }
1649
  else
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1650
    mysql_mutex_unlock(log_lock);
1651
  DBUG_VOID_RETURN;
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}

1654

1655
int register_slave_on_master(MYSQL* mysql, Master_info *mi,
1656
                             bool *suppress_warnings)
1657
{
1658
  uchar buf[1024], *pos= buf;
1659
  uint report_host_len=0, report_user_len=0, report_password_len=0;
1660
  DBUG_ENTER("register_slave_on_master");
1661

1662
  *suppress_warnings= FALSE;
1663 1664 1665 1666 1667 1668 1669 1670
  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);
1671
    DBUG_RETURN(0);
1672 1673
  }

1674
  if (report_user)
1675
    report_user_len= strlen(report_user);
1676 1677 1678 1679 1680 1681 1682 1683 1684
  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)
1686
    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);
  }
1695 1696

  int4store(pos, 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);
1700
  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;
1707
  /* The master will fill in master_id */
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  int4store(pos, 0);                    pos+= 4;
1709

1710
  if (simple_command(mysql, COM_REGISTER_SLAVE, buf, (size_t) (pos- buf), 0))
1711
  {
1712 1713 1714 1715
    if (mysql_errno(mysql) == ER_NET_READ_INTERRUPTED)
    {
      *suppress_warnings= TRUE;                 // Suppress reconnect warning
    }
1716
    else if (!check_io_slave_killed(mi->io_thd, mi, NULL))
1717 1718 1719 1720 1721 1722 1723
    {
      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);
    }
1724
    DBUG_RETURN(1);
1725
  }
1726
  DBUG_RETURN(0);
1727 1728
}

1729

1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740
/**
  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
*/
1741
bool show_master_info(THD* thd, Master_info* mi)
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{
1743
  // TODO: fix this for multi-master
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  List<Item> field_list;
1745 1746 1747
  Protocol *protocol= thd->protocol;
  DBUG_ENTER("show_master_info");

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  field_list.push_back(new Item_empty_string("Slave_IO_State",
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                                                     14));
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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)));
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  field_list.push_back(new Item_return_int("Master_Port", 7,
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                                           MYSQL_TYPE_LONG));
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  field_list.push_back(new Item_return_int("Connect_Retry", 10,
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                                           MYSQL_TYPE_LONG));
1758
  field_list.push_back(new Item_empty_string("Master_Log_File",
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                                             FN_REFLEN));
1760
  field_list.push_back(new Item_return_int("Read_Master_Log_Pos", 10,
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                                           MYSQL_TYPE_LONGLONG));
1762
  field_list.push_back(new Item_empty_string("Relay_Log_File",
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                                             FN_REFLEN));
1764
  field_list.push_back(new Item_return_int("Relay_Log_Pos", 10,
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                                           MYSQL_TYPE_LONGLONG));
1766
  field_list.push_back(new Item_empty_string("Relay_Master_Log_File",
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                                             FN_REFLEN));
1768 1769
  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));
1777 1778 1779
  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));
1781
  field_list.push_back(new Item_return_int("Exec_Master_Log_Pos", 10,
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                                           MYSQL_TYPE_LONGLONG));
1783
  field_list.push_back(new Item_return_int("Relay_Log_Space", 10,
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                                           MYSQL_TYPE_LONGLONG));
1785
  field_list.push_back(new Item_empty_string("Until_Condition", 6));
1786
  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,
1788
                                           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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  field_list.push_back(new Item_empty_string("Master_SSL_Cert",
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                                             sizeof(mi->ssl_cert)));
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  field_list.push_back(new Item_empty_string("Master_SSL_Cipher",
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                                             sizeof(mi->ssl_cipher)));
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  field_list.push_back(new Item_empty_string("Master_SSL_Key",
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                                             sizeof(mi->ssl_key)));
1800
  field_list.push_back(new Item_return_int("Seconds_Behind_Master", 10,
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                                           MYSQL_TYPE_LONGLONG));
1802 1803
  field_list.push_back(new Item_empty_string("Master_SSL_Verify_Server_Cert",
                                             3));
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  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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1812

1813
  if (protocol->send_result_set_metadata(&field_list,
1814
                            Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
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    DBUG_RETURN(TRUE);
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1816

1817 1818
  if (mi->host[0])
  {
1819
    DBUG_PRINT("info",("host is set: '%s'", mi->host));
1820
    String *packet= &thd->packet;
1821
    protocol->prepare_for_resend();
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1822

1823
    /*
1824 1825
      slave_running can be accessed without run_lock but not other
      non-volotile members like mi->io_thd, which is guarded by the mutex.
1826
    */
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1827
    mysql_mutex_lock(&mi->run_lock);
1828
    protocol->store(mi->io_thd ? mi->io_thd->proc_info : "", &my_charset_bin);
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    mysql_mutex_unlock(&mi->run_lock);
1830

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1831 1832 1833 1834
    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);
1835 1836
    protocol->store(mi->host, &my_charset_bin);
    protocol->store(mi->user, &my_charset_bin);
1837 1838
    protocol->store((uint32) mi->port);
    protocol->store((uint32) mi->connect_retry);
1839
    protocol->store(mi->master_log_name, &my_charset_bin);
1840
    protocol->store((ulonglong) mi->master_log_pos);
1841
    protocol->store(mi->rli.group_relay_log_name +
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1842 1843
                    dirname_length(mi->rli.group_relay_log_name),
                    &my_charset_bin);
1844 1845
    protocol->store((ulonglong) mi->rli.group_relay_log_pos);
    protocol->store(mi->rli.group_master_log_name, &my_charset_bin);
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1846
    protocol->store(mi->slave_running == MYSQL_SLAVE_RUN_CONNECT ?
1847 1848
                    "Yes" : (mi->slave_running == MYSQL_SLAVE_RUN_NOT_CONNECT ?
                             "Connecting" : "No"), &my_charset_bin);
1849
    protocol->store(mi->rli.slave_running ? "Yes":"No", &my_charset_bin);
1850 1851 1852
    protocol->store(rpl_filter->get_do_db());
    protocol->store(rpl_filter->get_ignore_db());

1853 1854
    char buf[256];
    String tmp(buf, sizeof(buf), &my_charset_bin);
1855
    rpl_filter->get_do_table(&tmp);
1856
    protocol->store(&tmp);
1857
    rpl_filter->get_ignore_table(&tmp);
1858
    protocol->store(&tmp);
1859
    rpl_filter->get_wild_do_table(&tmp);
1860
    protocol->store(&tmp);
1861
    rpl_filter->get_wild_ignore_table(&tmp);
1862 1863
    protocol->store(&tmp);

1864 1865
    protocol->store(mi->rli.last_error().number);
    protocol->store(mi->rli.last_error().message, &my_charset_bin);
1866
    protocol->store((uint32) mi->rli.slave_skip_counter);
1867
    protocol->store((ulonglong) mi->rli.group_master_log_pos);
1868
    protocol->store((ulonglong) mi->rli.log_space_total);
1869 1870

    protocol->store(
1871 1872
      mi->rli.until_condition==Relay_log_info::UNTIL_NONE ? "None":
        ( mi->rli.until_condition==Relay_log_info::UNTIL_MASTER_POS? "Master":
1873 1874 1875
          "Relay"), &my_charset_bin);
    protocol->store(mi->rli.until_log_name, &my_charset_bin);
    protocol->store((ulonglong) mi->rli.until_log_pos);
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1876 1877

#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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1887

1888 1889 1890 1891 1892 1893
    /*
      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)
1894
    {
1895
      long time_diff= ((long)(time(0) - mi->rli.last_master_timestamp)
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                       - mi->clock_diff_with_master);
1897
      /*
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        Apparently on some systems time_diff can be <0. Here are possible
        reasons related to MySQL:
1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911
        - 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.
1912 1913 1914 1915
        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".
1916
      */
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1917 1918
      protocol->store((longlong)(mi->rli.last_master_timestamp ?
                                 max(0, time_diff) : 0));
1919
    }
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1920
    else
1921
    {
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1922
      protocol->store_null();
1923 1924
    }
    protocol->store(mi->ssl_verify_server_cert? "Yes":"No", &my_charset_bin);
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1925

1926
    // Last_IO_Errno
1927
    protocol->store(mi->last_error().number);
1928
    // Last_IO_Error
1929
    protocol->store(mi->last_error().message, &my_charset_bin);
1930
    // Last_SQL_Errno
1931
    protocol->store(mi->rli.last_error().number);
1932
    // Last_SQL_Error
1933
    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);
1944
        slen= sprintf(sbuff, (i==0? "%lu" : ", %lu"), s_id);
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1945 1946 1947 1948 1949 1950
        if (cur_len + slen + 4 > FN_REFLEN)
        {
          /*
            break the loop whenever remained space could not fit
            ellipses on the next cycle
          */
1951
          sprintf(buff + cur_len, "...");
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          break;
        }
1954
        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);
1960

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1961 1962 1963 1964
    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);
1965

1966
    if (my_net_write(&thd->net, (uchar*) thd->packet.ptr(), packet->length()))
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      DBUG_RETURN(TRUE);
1968
  }
1969
  my_eof(thd);
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1970
  DBUG_RETURN(FALSE);
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}

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1973

1974 1975
void set_slave_thread_options(THD* thd)
{
1976
  DBUG_ENTER("set_slave_thread_options");
1977 1978 1979 1980 1981 1982 1983 1984 1985
  /*
     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.
  */
1986
  ulonglong options= thd->variables.option_bits | OPTION_BIG_SELECTS;
1987 1988 1989 1990
  if (opt_log_slave_updates)
    options|= OPTION_BIN_LOG;
  else
    options&= ~OPTION_BIN_LOG;
1991
  thd->variables.option_bits= options;
1992
  thd->variables.completion_type= 0;
1993
  DBUG_VOID_RETURN;
1994
}
1995

1996
void set_slave_thread_default_charset(THD* thd, Relay_log_info const *rli)
1997
{
1998 1999
  DBUG_ENTER("set_slave_thread_default_charset");

2000 2001 2002 2003 2004 2005 2006
  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();
2007 2008 2009 2010 2011 2012 2013

  /*
    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.
   */
2014
  const_cast<Relay_log_info*>(rli)->cached_charset_invalidate();
2015
  DBUG_VOID_RETURN;
2016 2017
}

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2018
/*
2019
  init_slave_thread()
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*/
2021

2022
static int init_slave_thread(THD* thd, SLAVE_THD_TYPE thd_type)
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2023 2024
{
  DBUG_ENTER("init_slave_thread");
2025 2026 2027
#if !defined(DBUG_OFF)
  int simulate_error= 0;
#endif
2028
  thd->system_thread = (thd_type == SLAVE_THD_SQL) ?
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    SYSTEM_THREAD_SLAVE_SQL : SYSTEM_THREAD_SLAVE_IO;
2030
  thd->security_ctx->skip_grants();
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  my_net_init(&thd->net, 0);
2032 2033 2034 2035 2036
/*
  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.
*/
2037
  thd->variables.max_allowed_packet= global_system_variables.max_allowed_packet
2038
    + MAX_LOG_EVENT_HEADER;  /* note, incr over the global not session var */
2039
  thd->slave_thread = 1;
2040
  thd->enable_slow_log= opt_log_slow_slave_statements;
2041
  set_slave_thread_options(thd);
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  thd->client_capabilities = CLIENT_LOCAL_FILES;
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  mysql_mutex_lock(&LOCK_thread_count);
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  thd->thread_id= thd->variables.pseudo_thread_id= thread_id++;
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  mysql_mutex_unlock(&LOCK_thread_count);
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2046

2047 2048 2049 2050 2051 2052 2053
  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););
#if !defined(DBUG_OFF)
  if (init_thr_lock() || thd->store_globals() || simulate_error & (1<< thd_type))
#else
2054
  if (init_thr_lock() || thd->store_globals())
2055
#endif
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  {
2057
    thd->cleanup();
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    DBUG_RETURN(-1);
  }

2061
  if (thd_type == SLAVE_THD_SQL)
2062
    thd_proc_info(thd, "Waiting for the next event in relay log");
2063
  else
2064
    thd_proc_info(thd, "Waiting for master update");
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  thd->set_time();
2066 2067
  /* Do not use user-supplied timeout value for system threads. */
  thd->variables.lock_wait_timeout= LONG_TIMEOUT;
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  DBUG_RETURN(0);
}

2071

2072
static int safe_sleep(THD* thd, int sec, CHECK_KILLED_FUNC thread_killed,
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                      void* thread_killed_arg)
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{
2075
  int nap_time;
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  thr_alarm_t alarmed;
2077 2078
  DBUG_ENTER("safe_sleep");

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  thr_alarm_init(&alarmed);
2080
  time_t start_time= my_time(0);
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  time_t end_time= start_time+sec;

2083
  while ((nap_time= (int) (end_time - start_time)) > 0)
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  {
2085
    ALARM alarm_buff;
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    /*
2087
      The only reason we are asking for alarm is so that
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      we will be woken up in case of murder, so if we do not get killed,
      set the alarm so it goes off after we wake up naturally
    */
2091
    thr_alarm(&alarmed, 2 * nap_time, &alarm_buff);
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    sleep(nap_time);
2093
    thr_end_alarm(&alarmed);
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2095
    if ((*thread_killed)(thd,thread_killed_arg))
2096
      DBUG_RETURN(1);
2097
    start_time= my_time(0);
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  }
2099
  DBUG_RETURN(0);
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}

2102

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static int request_dump(THD *thd, MYSQL* mysql, Master_info* mi,
			bool *suppress_warnings)
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{
2106
  uchar buf[FN_REFLEN + 10];
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  int len;
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  ushort binlog_flags = 0; // for now
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  char* logname = mi->master_log_name;
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  DBUG_ENTER("request_dump");
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  *suppress_warnings= FALSE;
2113

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  if (RUN_HOOK(binlog_relay_io,
               before_request_transmit,
               (thd, mi, binlog_flags)))
    DBUG_RETURN(1);
  
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  // TODO if big log files: Change next to int8store()
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  int4store(buf, (ulong) mi->master_log_pos);
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  int2store(buf + 4, binlog_flags);
2122
  int4store(buf + 6, server_id);
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  len = (uint) strlen(logname);
2124
  memcpy(buf + 10, logname,len);
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  if (simple_command(mysql, COM_BINLOG_DUMP, buf, len + 10, 1))
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  {
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    /*
      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 :-)
    */
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    if (mysql_errno(mysql) == ER_NET_READ_INTERRUPTED)
2133
      *suppress_warnings= TRUE;                 // Suppress reconnect warning
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    else
2135
      sql_print_error("Error on COM_BINLOG_DUMP: %d  %s, will retry in %d secs",
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                      mysql_errno(mysql), mysql_error(mysql),
2137
                      mi->connect_retry);
2138
    DBUG_RETURN(1);
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  }
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2141
  DBUG_RETURN(0);
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}

2144

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/*
2146
  Read one event from the master
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  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.
2156

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    RETURN VALUES
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    'packet_error'      Error
    number              Length of packet
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*/

2162
static ulong read_event(MYSQL* mysql, Master_info *mi, bool* suppress_warnings)
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{
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  ulong len;
2165
  DBUG_ENTER("read_event");
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2167
  *suppress_warnings= FALSE;
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  /*
    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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#ifndef DBUG_OFF
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  if (disconnect_slave_event_count && !(mi->events_till_disconnect--))
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    DBUG_RETURN(packet_error);
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#endif
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2176

2177
  len = cli_safe_read(mysql);
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  if (len == packet_error || (long) len < 1)
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  {
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    if (mysql_errno(mysql) == ER_NET_READ_INTERRUPTED)
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    {
      /*
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        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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      */
      *suppress_warnings= TRUE;
    }
    else
2190
      sql_print_error("Error reading packet from server: %s ( server_errno=%d)",
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                      mysql_error(mysql), mysql_errno(mysql));
2192
    DBUG_RETURN(packet_error);
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  }

2195 2196
  /* Check if eof packet */
  if (len < 8 && mysql->net.read_pos[0] == 254)
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  {
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    sql_print_information("Slave: received end packet from server, apparent "
                          "master shutdown: %s",
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                     mysql_error(mysql));
2201
     DBUG_RETURN(packet_error);
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  }
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  DBUG_PRINT("exit", ("len: %lu  net->read_pos[4]: %d",
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                      len, mysql->net.read_pos[4]));
  DBUG_RETURN(len - 1);
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}

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/*
  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)
{
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  DBUG_ENTER("has_temporary_error");

2220
  DBUG_EXECUTE_IF("all_errors_are_temporary_errors",
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2221
                  if (thd->stmt_da->is_error())
2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233
                  {
                    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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  /*
    Temporary error codes:
    currently, InnoDB deadlock detected by InnoDB or lock
    wait timeout (innodb_lock_wait_timeout exceeded
  */
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  if (thd->stmt_da->sql_errno() == ER_LOCK_DEADLOCK ||
      thd->stmt_da->sql_errno() == ER_LOCK_WAIT_TIMEOUT)
2242
    DBUG_RETURN(1);
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#ifdef HAVE_NDB_BINLOG
  /*
    currently temporary error set in ndbcluster
  */
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  List_iterator_fast<MYSQL_ERROR> it(thd->warning_info->warn_list());
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  MYSQL_ERROR *err;
  while ((err= it++))
  {
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    DBUG_PRINT("info", ("has condition %d %s", err->get_sql_errno(),
                        err->get_message_text()));
    switch (err->get_sql_errno())
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    {
    case ER_GET_TEMPORARY_ERRMSG:
2257
      DBUG_RETURN(1);
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    default:
      break;
    }
  }
#endif
2263
  DBUG_RETURN(0);
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}
2265

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/**
  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().
*/
2293
int apply_event_and_update_pos(Log_event* ev, THD* thd, Relay_log_info* rli)
2294 2295 2296 2297 2298 2299 2300 2301 2302
{
  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",
2303 2304
                      FLAGSTR(thd->variables.option_bits, OPTION_NOT_AUTOCOMMIT),
                      FLAGSTR(thd->variables.option_bits, OPTION_BEGIN),
2305
                      (ulong) rli->last_event_start_time));
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  /*
    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).
  */

  thd->server_id = ev->server_id; // use the original server id for logging
  thd->set_time();                            // time the query
  thd->lex->current_select= 0;
  if (!ev->when)
    ev->when= my_time(0);
  ev->thd = thd; // because up to this point, ev->thd == 0

2338 2339
  int reason= ev->shall_skip(rli);
  if (reason == Log_event::EVENT_SKIP_COUNT)
2340
    sql_slave_skip_counter= --rli->slave_skip_counter;
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2341
  mysql_mutex_unlock(&rli->data_lock);
2342 2343 2344
  if (reason == Log_event::EVENT_SKIP_NOT)
    exec_res= ev->apply_event(rli);

2345
#ifndef DBUG_OFF
2346 2347
  /*
    This only prints information to the debug trace.
2348

2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359
    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",
2360
                      test(thd->variables.option_bits & OPTION_BEGIN),
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                      rli->get_flag(Relay_log_info::IN_STMT)));
  DBUG_PRINT("skip_event", ("%s event was %s",
                            ev->get_type_str(), explain[reason]));
2364 2365 2366 2367 2368 2369
#endif

  DBUG_PRINT("info", ("apply_event error = %d", exec_res));
  if (exec_res == 0)
  {
    int error= ev->update_pos(rli);
2370 2371 2372 2373
#ifdef HAVE_purify
    if (!rli->is_fake)
#endif
    {
2374
#ifndef DBUG_OFF
2375
      char buf[22];
2376
#endif
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      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));
    }
2385 2386 2387 2388 2389 2390 2391 2392 2393
    /*
      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)
    {
2394
      char buf[22];
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      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
2430
     if a failure occurs when applying the event.)
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   - An error occurred when updating the binlog position.

  @retval 0 The event was applied.

  @retval 1 The event was not applied.
*/
2438
static int exec_relay_log_event(THD* thd, Relay_log_info* rli)
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2439
{
2440 2441
  DBUG_ENTER("exec_relay_log_event");

2442 2443
  /*
     We acquire this mutex since we need it for all operations except
2444
     event execution. But we will release it in places where we will
2445 2446
     wait for something for example inside of next_event().
   */
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2447
  mysql_mutex_lock(&rli->data_lock);
2448

2449
  Log_event * ev = next_event(rli);
2450

2451
  DBUG_ASSERT(rli->sql_thd==thd);
2452

2453
  if (sql_slave_killed(thd,rli))
2454
  {
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    mysql_mutex_unlock(&rli->data_lock);
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    delete ev;
2457
    DBUG_RETURN(1);
2458
  }
2459 2460
  if (ev)
  {
2461
    int exec_res;
2462

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    /*
      This tests if the position of the beginning of the current event
      hits the UNTIL barrier.
    */
2467
    if (rli->until_condition != Relay_log_info::UNTIL_NONE &&
2468
        rli->is_until_satisfied(thd, ev))
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    {
      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;
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      mysql_mutex_unlock(&rli->data_lock);
2479
      delete ev;
2480
      DBUG_RETURN(1);
2481
    }
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    { /**
         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;
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                        mysql_mutex_unlock(&rli->data_lock);
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                        delete ev;
                        rli->inc_event_relay_log_pos();
                        DBUG_RETURN(0);
                      };);
    }

2503
    exec_res= apply_event_and_update_pos(ev, thd, rli);
2504

2505
    /*
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      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.
2509
    */
2510
    if (ev->get_type_code() != FORMAT_DESCRIPTION_EVENT)
2511
    {
2512 2513
      DBUG_PRINT("info", ("Deleting the event after it has been executed"));
      delete ev;
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    }

2516
    /*
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      update_log_pos failed: this should not happen, so we don't
      retry.
2519
    */
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    if (exec_res == 2)
      DBUG_RETURN(1);

2523 2524
    if (slave_trans_retries)
    {
2525
      int UNINIT_VAR(temp_err);
2526
      if (exec_res && (temp_err= has_temporary_error(thd)))
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      {
        const char *errmsg;
        /*
          We were in a transaction which has been rolled back because of a
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          temporary error;
          let's seek back to BEGIN log event and retry it all again.
2533
	  Note, if lock wait timeout (innodb_lock_wait_timeout exceeded)
2534
	  there is no rollback since 5.0.13 (ref: manual).
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          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.
        */
2543
        if (rli->trans_retries < slave_trans_retries)
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        {
          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,
2550
                                      1, &errmsg, 1))
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            sql_print_error("Error initializing relay log position: %s",
                            errmsg);
          else
          {
            exec_res= 0;
2556
            rli->cleanup_context(thd, 1);
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            /* chance for concurrent connection to get more locks */
2558
            safe_sleep(thd, min(rli->trans_retries, MAX_SLAVE_RETRY_PAUSE),
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                       (CHECK_KILLED_FUNC)sql_slave_killed, (void*)rli);
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            mysql_mutex_lock(&rli->data_lock); // because of SHOW STATUS
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            rli->trans_retries++;
2562
            rli->retried_trans++;
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            mysql_mutex_unlock(&rli->data_lock);
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            DBUG_PRINT("info", ("Slave retries transaction "
                                "rli->trans_retries: %lu", rli->trans_retries));
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          }
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        }
        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);
      }
2574
      else if ((exec_res && !temp_err) ||
2575 2576
               (opt_using_transactions &&
                rli->group_relay_log_pos == rli->event_relay_log_pos))
2577 2578
      {
        /*
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          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
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          non-transient error, the slave will stop with an error.
         */
        rli->trans_retries= 0; // restart from fresh
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        DBUG_PRINT("info", ("Resetting retry counter, rli->trans_retries: %lu",
2586
                            rli->trans_retries));
2587
      }
2588 2589
    }
    DBUG_RETURN(exec_res);
2590
  }
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  mysql_mutex_unlock(&rli->data_lock);
2592 2593
  rli->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_READ_FAILURE,
              ER(ER_SLAVE_RELAY_LOG_READ_FAILURE), "\
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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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");
2602
  DBUG_RETURN(1);
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}

2605

2606
static bool check_io_slave_killed(THD *thd, Master_info *mi, const char *info)
2607 2608 2609
{
  if (io_slave_killed(thd, mi))
  {
2610
    if (info && global_system_variables.log_warnings)
2611
      sql_print_information("%s", info);
2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642
    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.
*/

2643
static int try_to_reconnect(THD *thd, MYSQL *mysql, Master_info *mi,
2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679
                            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
    safe_sleep(thd, mi->connect_retry, (CHECK_KILLED_FUNC) io_slave_killed,
               (void *) mi);
  }
  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];
    my_snprintf(buf, sizeof(buf), messages[SLAVE_RECON_MSG_FAILED], 
                IO_RPL_LOG_NAME, llstr(mi->master_log_pos, llbuff));
    /* 
      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
    {
2680
      sql_print_information("%s", buf);
2681 2682 2683 2684 2685
    }
  }
  if (safe_reconnect(thd, mysql, mi, 1) || io_slave_killed(thd, mi))
  {
    if (global_system_variables.log_warnings)
2686
      sql_print_information("%s", messages[SLAVE_RECON_MSG_KILLED_AFTER]);
2687 2688 2689 2690 2691 2692
    return 1;
  }
  return 0;
}


2693 2694 2695 2696 2697
/**
  Slave IO thread entry point.

  @param arg Pointer to Master_info struct that holds information for
  the IO thread.
2698

2699 2700
  @return Always 0.
*/
2701
pthread_handler_t handle_slave_io(void *arg)
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{
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  THD *thd; // needs to be first for thread_stack
  MYSQL *mysql;
2705
  Master_info *mi = (Master_info*)arg;
2706
  Relay_log_info *rli= &mi->rli;
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  char llbuff[22];
  uint retry_count;
2709
  bool suppress_warnings;
2710
  int ret;
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#ifndef DBUG_OFF
  uint retry_count_reg= 0, retry_count_dump= 0, retry_count_event= 0;
#endif
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  // needs to call my_thread_init(), otherwise we get a coredump in DBUG_ stuff
  my_thread_init();
2716
  DBUG_ENTER("handle_slave_io");
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2718
  DBUG_ASSERT(mi->inited);
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  mysql= NULL ;
  retry_count= 0;

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  mysql_mutex_lock(&mi->run_lock);
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  /* Inform waiting threads that slave has started */
  mi->slave_run_id++;

2726
#ifndef DBUG_OFF
2727
  mi->events_till_disconnect = disconnect_slave_event_count;
2728 2729
#endif

2730
  thd= new THD; // note that contructor of THD uses DBUG_ !
2731
  THD_CHECK_SENTRY(thd);
2732
  mi->io_thd = thd;
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  pthread_detach_this_thread();
2735
  thd->thread_stack= (char*) &thd; // remember where our stack is
2736
  mi->clear_error();
2737
  if (init_slave_thread(thd, SLAVE_THD_IO))
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  {
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    mysql_cond_broadcast(&mi->start_cond);
    mysql_mutex_unlock(&mi->run_lock);
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    sql_print_error("Failed during slave I/O thread initialization");
    goto err;
  }
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  mysql_mutex_lock(&LOCK_thread_count);
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  threads.append(thd);
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  mysql_mutex_unlock(&LOCK_thread_count);
2747 2748
  mi->slave_running = 1;
  mi->abort_slave = 0;
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  mysql_mutex_unlock(&mi->run_lock);
  mysql_cond_broadcast(&mi->start_cond);
2751

2752
  DBUG_PRINT("master_info",("log_file_name: '%s'  position: %s",
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                            mi->master_log_name,
                            llstr(mi->master_log_pos,llbuff)));
2755

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  /* This must be called before run any binlog_relay_io hooks */
  my_pthread_setspecific_ptr(RPL_MASTER_INFO, mi);

  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;
  }

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  if (!(mi->mysql = mysql = mysql_init(NULL)))
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  {
2768 2769
    mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR,
               ER(ER_SLAVE_FATAL_ERROR), "error in mysql_init()");
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    goto err;
  }
2772

2773
  thd_proc_info(thd, "Connecting to master");
2774
  // we can get killed during safe_connect
2775
  if (!safe_connect(thd, mysql, mi))
2776
  {
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    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,
2780 2781
			  IO_RPL_LOG_NAME,
			  llstr(mi->master_log_pos,llbuff));
2782 2783 2784 2785 2786
  /*
    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.
  */
2787 2788
    mysql->net.max_packet_size= thd->net.max_packet_size+= MAX_LOG_EVENT_HEADER;
  }
2789
  else
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2790
  {
2791
    sql_print_information("Slave I/O thread killed while connecting to master");
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    goto err;
  }
2794

2795
connected:
2796

2797 2798 2799 2800 2801 2802 2803 2804 2805 2806
    DBUG_EXECUTE_IF("dbug.before_get_running_status_yes",
                    {
                      const char act[]=
                        "now "
                        "wait_for signal.io_thread_let_running";
                      DBUG_ASSERT(opt_debug_sync_timeout > 0);
                      DBUG_ASSERT(!debug_sync_set_action(thd, 
                                                         STRING_WITH_LEN(act)));
                    };);

2807 2808
  // TODO: the assignment below should be under mutex (5.0)
  mi->slave_running= MYSQL_SLAVE_RUN_CONNECT;
2809
  thd->slave_net = &mysql->net;
2810
  thd_proc_info(thd, "Checking master version");
2811 2812 2813
  ret= get_master_version_and_clock(mysql, mi);
  if (ret == 1)
    /* Fatal error */
2814
    goto err;
2815

2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827
  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;
  } 
2828 2829

  if (mi->rli.relay_log.description_event_for_queue->binlog_version > 1)
2830
  {
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    /*
      Register ourselves with the master.
    */
2834
    thd_proc_info(thd, "Registering slave on master");
2835
    if (register_slave_on_master(mysql, mi, &suppress_warnings))
2836
    {
2837 2838 2839 2840 2841 2842 2843 2844 2845
      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
2846 2847
        goto err;
      goto connected;
2848
    }
2849 2850 2851 2852 2853 2854 2855 2856 2857 2858
    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;
      });
2859
  }
2860

2861
  DBUG_PRINT("info",("Starting reading binary log from master"));
2862
  while (!io_slave_killed(thd,mi))
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2863
  {
2864
    thd_proc_info(thd, "Requesting binlog dump");
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    if (request_dump(thd, mysql, mi, &suppress_warnings))
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2866 2867
    {
      sql_print_error("Failed on request_dump()");
2868 2869 2870 2871
      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]))
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        goto err;
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      goto connected;
    }
2875 2876 2877 2878 2879 2880 2881 2882 2883 2884
    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;
      });
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2885
    const char *event_buf;
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2886

2887
    DBUG_ASSERT(mi->last_error().number == 0);
2888
    while (!io_slave_killed(thd,mi))
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2889
    {
2890
      ulong event_len;
2891
      /*
2892
         We say "waiting" because read_event() will wait if there's nothing to
2893 2894 2895
         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.
2896
      */
2897
      thd_proc_info(thd, "Waiting for master to send event");
2898
      event_len= read_event(mysql, mi, &suppress_warnings);
2899 2900
      if (check_io_slave_killed(thd, mi, "Slave I/O thread killed while \
reading event"))
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2901
        goto err;
2902 2903 2904 2905 2906 2907 2908 2909 2910 2911
      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;
        });
2912

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2913 2914
      if (event_len == packet_error)
      {
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2915
        uint mysql_error_number= mysql_errno(mysql);
2916 2917
        switch (mysql_error_number) {
        case CR_NET_PACKET_TOO_LARGE:
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2918
          sql_print_error("\
2919 2920 2921
Log entry on master is longer than max_allowed_packet (%ld) on \
slave. If the entry is correct, restart the server with a higher value of \
max_allowed_packet",
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                          thd->variables.max_allowed_packet);
2923
          mi->report(ERROR_LEVEL, ER_NET_PACKET_TOO_LARGE,
2924
                     "%s", ER(ER_NET_PACKET_TOO_LARGE));
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2925
          goto err;
2926
        case ER_MASTER_FATAL_ERROR_READING_BINLOG:
2927 2928 2929
          mi->report(ERROR_LEVEL, ER_MASTER_FATAL_ERROR_READING_BINLOG,
                     ER(ER_MASTER_FATAL_ERROR_READING_BINLOG),
                     mysql_error_number, mysql_error(mysql));
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          goto err;
2931
        case ER_OUT_OF_RESOURCES:
2932 2933
          sql_print_error("\
Stopping slave I/O thread due to out-of-memory error from master");
2934
          mi->report(ERROR_LEVEL, ER_OUT_OF_RESOURCES,
2935
                     "%s", ER(ER_OUT_OF_RESOURCES));
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2936 2937
          goto err;
        }
2938 2939
        if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
                             reconnect_messages[SLAVE_RECON_ACT_EVENT]))
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          goto err;
        goto connected;
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2942
      } // if (event_len == packet_error)
2943

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      retry_count=0;                    // ok event, reset retry counter
2945
      thd_proc_info(thd, "Queueing master event to the relay log");
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      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))
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2961
      {
2962 2963 2964
        mi->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_WRITE_FAILURE,
                   ER(ER_SLAVE_RELAY_LOG_WRITE_FAILURE),
                   "could not queue event from master");
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        goto err;
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2966
      }
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2967 2968 2969 2970 2971 2972 2973 2974 2975 2976

      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;
      }

2977
      if (flush_master_info(mi, TRUE, TRUE))
2978 2979 2980 2981
      {
        sql_print_error("Failed to flush master info file");
        goto err;
      }
2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993
      /*
        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.
      */
2994 2995 2996 2997 2998
#ifndef DBUG_OFF
      {
        char llbuf1[22], llbuf2[22];
        DBUG_PRINT("info", ("log_space_limit=%s log_space_total=%s \
ignore_log_space_limit=%d",
2999 3000
                            llstr(rli->log_space_limit,llbuf1),
                            llstr(rli->log_space_total,llbuf2),
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3001
                            (int) rli->ignore_log_space_limit));
3002 3003 3004
      }
#endif

3005
      if (rli->log_space_limit && rli->log_space_limit <
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          rli->log_space_total &&
3007
          !rli->ignore_log_space_limit)
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        if (wait_for_relay_log_space(rli))
        {
          sql_print_error("Slave I/O thread aborted while waiting for relay \
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3011
log space");
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          goto err;
        }
    }
3015
  }
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3016

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3017
  // error = 0;
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err:
3019
  // print the current replication position
3020
  sql_print_information("Slave I/O thread exiting, read up to log '%s', position %s",
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3021
                  IO_RPL_LOG_NAME, llstr(mi->master_log_pos,llbuff));
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  RUN_HOOK(binlog_relay_io, thread_stop, (thd, mi));
3023
  thd->reset_query();
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3024
  thd->reset_db(NULL, 0);
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  if (mysql)
  {
3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037
    /*
      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
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    mysql_close(mysql);
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    mi->mysql=0;
  }
3041
  write_ignored_events_info_to_relay_log(thd, mi);
3042
  thd_proc_info(thd, "Waiting for slave mutex on exit");
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3043
  mysql_mutex_lock(&mi->run_lock);
3044

3045 3046 3047
  /* Forget the relay log's format */
  delete mi->rli.relay_log.description_event_for_queue;
  mi->rli.relay_log.description_event_for_queue= 0;
3048
  // TODO: make rpl_status part of Master_info
3049
  change_rpl_status(RPL_ACTIVE_SLAVE,RPL_IDLE_SLAVE);
3050
  DBUG_ASSERT(thd->net.buff != 0);
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  net_end(&thd->net); // destructor will not free it, because net.vio is 0
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3052
  mysql_mutex_lock(&LOCK_thread_count);
3053
  THD_CHECK_SENTRY(thd);
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  delete thd;
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  mysql_mutex_unlock(&LOCK_thread_count);
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  mi->abort_slave= 0;
  mi->slave_running= 0;
  mi->io_thd= 0;
3059 3060 3061 3062 3063
  /*
    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)
   */ 
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  mysql_cond_broadcast(&mi->stop_cond);       // tell the world we are done
3065
  DBUG_EXECUTE_IF("simulate_slave_delay_at_terminate_bug38694", sleep(5););
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  mysql_mutex_unlock(&mi->run_lock);
3067 3068

  DBUG_LEAVE;                                   // Must match DBUG_ENTER()
3069
  my_thread_end();
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  pthread_exit(0);
3071
  return 0;                                     // Avoid compiler warnings
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}

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/*
  Check the temporary directory used by commands like
  LOAD DATA INFILE.
 */
static 
3079
int check_temp_dir(char* tmp_file)
3080 3081 3082
{
  int fd;
  MY_DIR *dirp;
3083 3084
  char tmp_dir[FN_REFLEN];
  size_t tmp_dir_size;
3085 3086 3087

  DBUG_ENTER("check_temp_dir");

3088 3089 3090 3091 3092
  /*
    Get the directory from the temporary file.
  */
  dirname_part(tmp_dir, tmp_file, &tmp_dir_size);

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  /*
    Check if the directory exists.
   */
  if (!(dirp=my_dir(tmp_dir,MYF(MY_WME))))
    DBUG_RETURN(1);
  my_dirend(dirp);

  /*
    Check permissions to create a file.
   */
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  if ((fd= mysql_file_create(key_file_misc,
                             tmp_file, CREATE_MODE,
                             O_WRONLY | O_BINARY | O_EXCL | O_NOFOLLOW,
                             MYF(MY_WME))) < 0)
3107 3108 3109 3110 3111
  DBUG_RETURN(1);

  /*
    Clean up.
   */
Marc Alff's avatar
Marc Alff committed
3112 3113
  mysql_file_close(fd, MYF(0));
  mysql_file_delete(key_file_misc, tmp_file, MYF(0));
3114 3115 3116

  DBUG_RETURN(0);
}
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3117

3118 3119 3120 3121 3122
/**
  Slave SQL thread entry point.

  @param arg Pointer to Relay_log_info object that holds information
  for the SQL thread.
unknown's avatar
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3123

3124 3125
  @return Always 0.
*/
3126
pthread_handler_t handle_slave_sql(void *arg)
3127
{
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3128
  THD *thd;                     /* needs to be first for thread_stack */
3129
  char llbuff[22],llbuff1[22];
3130 3131
  char saved_log_name[FN_REFLEN];
  char saved_master_log_name[FN_REFLEN];
3132 3133
  my_off_t UNINIT_VAR(saved_log_pos);
  my_off_t UNINIT_VAR(saved_master_log_pos);
3134
  my_off_t saved_skip= 0;
3135

3136
  Relay_log_info* rli = &((Master_info*)arg)->rli;
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3137 3138 3139 3140
  const char *errmsg;

  // needs to call my_thread_init(), otherwise we get a coredump in DBUG_ stuff
  my_thread_init();
3141
  DBUG_ENTER("handle_slave_sql");
unknown's avatar
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3142

3143
  DBUG_ASSERT(rli->inited);
Marc Alff's avatar
Marc Alff committed
3144
  mysql_mutex_lock(&rli->run_lock);
3145
  DBUG_ASSERT(!rli->slave_running);
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3146
  errmsg= 0;
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3147
#ifndef DBUG_OFF
3148
  rli->events_till_abort = abort_slave_event_count;
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3149
#endif
3150

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3151
  thd = new THD; // note that contructor of THD uses DBUG_ !
3152
  thd->thread_stack = (char*)&thd; // remember where our stack is
3153
  rli->sql_thd= thd;
3154
  
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3155 3156
  /* Inform waiting threads that slave has started */
  rli->slave_run_id++;
3157
  rli->slave_running = 1;
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3158

3159 3160
  pthread_detach_this_thread();
  if (init_slave_thread(thd, SLAVE_THD_SQL))
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3161 3162 3163 3164 3165
  {
    /*
      TODO: this is currently broken - slave start and change master
      will be stuck if we fail here
    */
Marc Alff's avatar
Marc Alff committed
3166 3167
    mysql_cond_broadcast(&rli->start_cond);
    mysql_mutex_unlock(&rli->run_lock);
3168 3169
    rli->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, 
                "Failed during slave thread initialization");
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3170 3171
    goto err;
  }
3172
  thd->init_for_queries();
3173
  thd->temporary_tables = rli->save_temporary_tables; // restore temp tables
3174
  set_thd_in_use_temporary_tables(rli);   // (re)set sql_thd in use for saved temp tables
Marc Alff's avatar
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3175
  mysql_mutex_lock(&LOCK_thread_count);
3176
  threads.append(thd);
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Marc Alff committed
3177
  mysql_mutex_unlock(&LOCK_thread_count);
3178 3179 3180 3181 3182 3183 3184 3185
  /*
    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.
  */
3186
  rli->abort_slave = 0;
Marc Alff's avatar
Marc Alff committed
3187 3188
  mysql_mutex_unlock(&rli->run_lock);
  mysql_cond_broadcast(&rli->start_cond);
3189

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3190 3191 3192
  /*
    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
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3193
    though there's no problem anymore). Do not reset the master timestamp
3194 3195 3196 3197
    (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.
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3198
    But the master timestamp is reset by RESET SLAVE & CHANGE MASTER.
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3199
  */
3200
  rli->clear_error();
3201 3202

  //tell the I/O thread to take relay_log_space_limit into account from now on
Marc Alff's avatar
Marc Alff committed
3203
  mysql_mutex_lock(&rli->log_space_lock);
3204
  rli->ignore_log_space_limit= 0;
Marc Alff's avatar
Marc Alff committed
3205
  mysql_mutex_unlock(&rli->log_space_lock);
3206
  rli->trans_retries= 0; // start from "no error"
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3207
  DBUG_PRINT("info", ("rli->trans_retries: %lu", rli->trans_retries));
3208

3209
  if (init_relay_log_pos(rli,
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3210 3211 3212
                         rli->group_relay_log_name,
                         rli->group_relay_log_pos,
                         1 /*need data lock*/, &errmsg,
3213
                         1 /*look for a description_event*/))
3214 3215 3216
  { 
    rli->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, 
                "Error initializing relay log position: %s", errmsg);
3217 3218
    goto err;
  }
3219
  THD_CHECK_SENTRY(thd);
3220 3221 3222 3223
#ifndef DBUG_OFF
  {
    char llbuf1[22], llbuf2[22];
    DBUG_PRINT("info", ("my_b_tell(rli->cur_log)=%s rli->event_relay_log_pos=%s",
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3224
                        llstr(my_b_tell(rli->cur_log),llbuf1),
3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243
                        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
3244
  DBUG_ASSERT(rli->sql_thd == thd);
3245 3246

  DBUG_PRINT("master_info",("log_file_name: %s  position: %s",
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3247 3248
                            rli->group_master_log_name,
                            llstr(rli->group_master_log_pos,llbuff)));
3249
  if (global_system_variables.log_warnings)
3250
    sql_print_information("Slave SQL thread initialized, starting replication in \
unknown's avatar
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3251
log '%s' at position %s, relay log '%s' position: %s", RPL_LOG_NAME,
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3252 3253
                    llstr(rli->group_master_log_pos,llbuff),rli->group_relay_log_name,
                    llstr(rli->group_relay_log_pos,llbuff1));
3254

3255
  if (check_temp_dir(rli->slave_patternload_file))
3256
  {
Marc Alff's avatar
Marc Alff committed
3257
    rli->report(ERROR_LEVEL, thd->stmt_da->sql_errno(), 
3258
                "Unable to use slave's temporary directory %s - %s", 
Marc Alff's avatar
Marc Alff committed
3259
                slave_load_tmpdir, thd->stmt_da->message());
3260 3261 3262
    goto err;
  }

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3263
  /* execute init_slave variable */
3264
  if (opt_init_slave.length)
unknown's avatar
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3265
  {
3266
    execute_init_command(thd, &opt_init_slave, &LOCK_sys_init_slave);
3267
    if (thd->is_slave_error)
unknown's avatar
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3268
    {
Marc Alff's avatar
Marc Alff committed
3269
      rli->report(ERROR_LEVEL, thd->stmt_da->sql_errno(),
3270
                  "Slave SQL thread aborted. Can't execute init_slave query");
unknown's avatar
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3271 3272 3273 3274
      goto err;
    }
  }

3275 3276 3277 3278
  /*
    First check until condition - probably there is nothing to execute. We
    do not want to wait for next event in this case.
  */
Marc Alff's avatar
Marc Alff committed
3279
  mysql_mutex_lock(&rli->data_lock);
3280 3281
  if (rli->slave_skip_counter)
  {
3282 3283
    strmake(saved_log_name, rli->group_relay_log_name, FN_REFLEN - 1);
    strmake(saved_master_log_name, rli->group_master_log_name, FN_REFLEN - 1);
3284 3285 3286 3287
    saved_log_pos= rli->group_relay_log_pos;
    saved_master_log_pos= rli->group_master_log_pos;
    saved_skip= rli->slave_skip_counter;
  }
3288
  if (rli->until_condition != Relay_log_info::UNTIL_NONE &&
3289
      rli->is_until_satisfied(thd, NULL))
3290 3291 3292 3293
  {
    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
Marc Alff committed
3294
    mysql_mutex_unlock(&rli->data_lock);
3295 3296
    goto err;
  }
Marc Alff's avatar
Marc Alff committed
3297
  mysql_mutex_unlock(&rli->data_lock);
3298

3299 3300
  /* Read queries from the IO/THREAD until this thread is killed */

3301
  while (!sql_slave_killed(thd,rli))
3302
  {
3303
    thd_proc_info(thd, "Reading event from the relay log");
3304
    DBUG_ASSERT(rli->sql_thd == thd);
3305
    THD_CHECK_SENTRY(thd);
3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320

    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;
    }
    
3321 3322
    if (exec_relay_log_event(thd,rli))
    {
3323
      DBUG_PRINT("info", ("exec_relay_log_event() failed"));
3324
      // do not scare the user if SQL thread was simply killed or stopped
3325
      if (!sql_slave_killed(thd,rli))
unknown's avatar
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3326 3327
      {
        /*
3328 3329 3330
          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
unknown's avatar
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3331
        */
3332
        uint32 const last_errno= rli->last_error().number;
3333

3334
        if (thd->is_error())
unknown's avatar
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3335
        {
Marc Alff's avatar
Marc Alff committed
3336
          char const *const errmsg= thd->stmt_da->message();
3337 3338

          DBUG_PRINT("info",
Marc Alff's avatar
Marc Alff committed
3339 3340
                     ("thd->stmt_da->sql_errno()=%d; rli->last_error.number=%d",
                      thd->stmt_da->sql_errno(), last_errno));
3341
          if (last_errno == 0)
unknown's avatar
unknown committed
3342
          {
3343 3344 3345 3346
            /*
 	      This function is reporting an error which was not reported
 	      while executing exec_relay_log_event().
 	    */ 
3347
            rli->report(ERROR_LEVEL, thd->stmt_da->sql_errno(), "%s", errmsg);
unknown's avatar
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3348
          }
Marc Alff's avatar
Marc Alff committed
3349
          else if (last_errno != thd->stmt_da->sql_errno())
unknown's avatar
unknown committed
3350
          {
3351 3352 3353 3354 3355 3356
            /*
             * 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.
             */  
unknown's avatar
unknown committed
3357
            sql_print_error("Slave (additional info): %s Error_code: %d",
Marc Alff's avatar
Marc Alff committed
3358
                            errmsg, thd->stmt_da->sql_errno());
unknown's avatar
unknown committed
3359 3360 3361 3362
          }
        }

        /* Print any warnings issued */
Marc Alff's avatar
Marc Alff committed
3363
        List_iterator_fast<MYSQL_ERROR> it(thd->warning_info->warn_list());
unknown's avatar
unknown committed
3364
        MYSQL_ERROR *err;
3365 3366 3367 3368 3369
        /*
          Added controlled slave thread cancel for replication
          of user-defined variables.
        */
        bool udf_error = false;
unknown's avatar
unknown committed
3370
        while ((err= it++))
3371
        {
Marc Alff's avatar
Marc Alff committed
3372
          if (err->get_sql_errno() == ER_CANT_OPEN_LIBRARY)
3373
            udf_error = true;
Marc Alff's avatar
Marc Alff committed
3374
          sql_print_warning("Slave: %s Error_code: %d", err->get_message_text(), err->get_sql_errno());
3375 3376 3377 3378 3379 3380 3381 3382 3383
        }
        if (udf_error)
          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' "
            "position %s", RPL_LOG_NAME, llstr(rli->group_master_log_pos, 
            llbuff));
        else
          sql_print_error("\
3384
Error running query, slave SQL thread aborted. Fix the problem, and restart \
unknown's avatar
unknown committed
3385
the slave SQL thread with \"SLAVE START\". We stopped at log \
3386
'%s' position %s", RPL_LOG_NAME, llstr(rli->group_master_log_pos, llbuff));
unknown's avatar
unknown committed
3387
      }
3388 3389
      goto err;
    }
3390
  }
3391

3392
  /* Thread stopped. Print the current replication position to the log */
unknown's avatar
unknown committed
3393
  sql_print_information("Slave SQL thread exiting, replication stopped in log "
unknown's avatar
unknown committed
3394 3395
                        "'%s' at position %s",
                        RPL_LOG_NAME, llstr(rli->group_master_log_pos,llbuff));
3396 3397

 err:
3398 3399 3400 3401 3402 3403 3404

  /*
    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:
  */
3405
  thd->clear_error();
3406
  rli->cleanup_context(thd, 1);
3407 3408 3409 3410 3411
  /*
    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)).
  */
3412
  thd->catalog= 0;
3413
  thd->reset_query();
unknown's avatar
unknown committed
3414
  thd->reset_db(NULL, 0);
3415
  thd_proc_info(thd, "Waiting for slave mutex on exit");
Marc Alff's avatar
Marc Alff committed
3416
  mysql_mutex_lock(&rli->run_lock);
3417
  /* We need data_lock, at least to wake up any waiting master_pos_wait() */
Marc Alff's avatar
Marc Alff committed
3418
  mysql_mutex_lock(&rli->data_lock);
3419
  DBUG_ASSERT(rli->slave_running == 1); // tracking buffer overrun
3420
  /* When master_pos_wait() wakes up it will check this and terminate */
unknown's avatar
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3421
  rli->slave_running= 0;
3422 3423 3424
  /* Forget the relay log's format */
  delete rli->relay_log.description_event_for_exec;
  rli->relay_log.description_event_for_exec= 0;
3425
  /* Wake up master_pos_wait() */
Marc Alff's avatar
Marc Alff committed
3426
  mysql_mutex_unlock(&rli->data_lock);
3427
  DBUG_PRINT("info",("Signaling possibly waiting master_pos_wait() functions"));
Marc Alff's avatar
Marc Alff committed
3428
  mysql_cond_broadcast(&rli->data_cond);
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unknown committed
3429
  rli->ignore_log_space_limit= 0; /* don't need any lock */
3430 3431
  /* we die so won't remember charset - re-update them on next thread start */
  rli->cached_charset_invalidate();
3432
  rli->save_temporary_tables = thd->temporary_tables;
unknown's avatar
unknown committed
3433 3434 3435 3436 3437

  /*
    TODO: see if we can do this conditionally in next_event() instead
    to avoid unneeded position re-init
  */
3438 3439 3440 3441
  thd->temporary_tables = 0; // remove tempation from destructor to close them
  DBUG_ASSERT(thd->net.buff != 0);
  net_end(&thd->net); // destructor will not free it, because we are weird
  DBUG_ASSERT(rli->sql_thd == thd);
3442
  THD_CHECK_SENTRY(thd);
3443
  rli->sql_thd= 0;
3444
  set_thd_in_use_temporary_tables(rli);  // (re)set sql_thd in use for saved temp tables
Marc Alff's avatar
Marc Alff committed
3445
  mysql_mutex_lock(&LOCK_thread_count);
3446
  THD_CHECK_SENTRY(thd);
3447
  delete thd;
Marc Alff's avatar
Marc Alff committed
3448
  mysql_mutex_unlock(&LOCK_thread_count);
3449 3450 3451 3452 3453
 /*
  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
3454
  mysql_cond_broadcast(&rli->stop_cond);
3455
  DBUG_EXECUTE_IF("simulate_slave_delay_at_terminate_bug38694", sleep(5););
Marc Alff's avatar
Marc Alff committed
3456
  mysql_mutex_unlock(&rli->run_lock);  // tell the world we are done
3457 3458

  DBUG_LEAVE;                                   // Must match DBUG_ENTER()
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unknown committed
3459
  my_thread_end();
3460
  pthread_exit(0);
3461
  return 0;                                     // Avoid compiler warnings
3462
}
unknown's avatar
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3463

3464

unknown's avatar
unknown committed
3465
/*
3466
  process_io_create_file()
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3467
*/
3468

3469
static int process_io_create_file(Master_info* mi, Create_file_log_event* cev)
unknown's avatar
unknown committed
3470 3471 3472 3473
{
  int error = 1;
  ulong num_bytes;
  bool cev_not_written;
3474 3475
  THD *thd = mi->io_thd;
  NET *net = &mi->mysql->net;
unknown's avatar
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3476
  DBUG_ENTER("process_io_create_file");
unknown's avatar
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3477 3478

  if (unlikely(!cev->is_valid()))
unknown's avatar
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3479
    DBUG_RETURN(1);
3480 3481

  if (!rpl_filter->db_ok(cev->db))
unknown's avatar
unknown committed
3482 3483
  {
    skip_load_data_infile(net);
unknown's avatar
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3484
    DBUG_RETURN(0);
unknown's avatar
unknown committed
3485 3486 3487
  }
  DBUG_ASSERT(cev->inited_from_old);
  thd->file_id = cev->file_id = mi->file_id++;
3488
  thd->server_id = cev->server_id;
unknown's avatar
unknown committed
3489
  cev_not_written = 1;
unknown's avatar
unknown committed
3490

unknown's avatar
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3491 3492 3493
  if (unlikely(net_request_file(net,cev->fname)))
  {
    sql_print_error("Slave I/O: failed requesting download of '%s'",
unknown's avatar
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3494
                    cev->fname);
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3495 3496 3497
    goto err;
  }

unknown's avatar
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3498 3499 3500 3501
  /*
    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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3502 3503
  */
  {
3504
    Append_block_log_event aev(thd,0,0,0,0);
unknown's avatar
unknown committed
3505

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3506 3507 3508 3509
    for (;;)
    {
      if (unlikely((num_bytes=my_net_read(net)) == packet_error))
      {
unknown's avatar
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3510 3511 3512
        sql_print_error("Network read error downloading '%s' from master",
                        cev->fname);
        goto err;
unknown's avatar
unknown committed
3513 3514 3515
      }
      if (unlikely(!num_bytes)) /* eof */
      {
3516 3517
	/* 3.23 master wants it */
        net_write_command(net, 0, (uchar*) "", 0, (uchar*) "", 0);
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3518 3519 3520 3521 3522 3523 3524
        /*
          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))
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unknown committed
3525 3526 3527 3528 3529
          break;
        Execute_load_log_event xev(thd,0,0);
        xev.log_pos = cev->log_pos;
        if (unlikely(mi->rli.relay_log.append(&xev)))
        {
3530 3531 3532
          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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3533 3534 3535 3536
          goto err;
        }
        mi->rli.relay_log.harvest_bytes_written(&mi->rli.log_space_total);
        break;
unknown's avatar
unknown committed
3537 3538 3539
      }
      if (unlikely(cev_not_written))
      {
unknown's avatar
unknown committed
3540
        cev->block = net->read_pos;
unknown's avatar
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3541 3542 3543
        cev->block_len = num_bytes;
        if (unlikely(mi->rli.relay_log.append(cev)))
        {
3544 3545 3546
          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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3547 3548 3549 3550
          goto err;
        }
        cev_not_written=0;
        mi->rli.relay_log.harvest_bytes_written(&mi->rli.log_space_total);
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3551 3552 3553
      }
      else
      {
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        aev.block = net->read_pos;
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        aev.block_len = num_bytes;
        aev.log_pos = cev->log_pos;
        if (unlikely(mi->rli.relay_log.append(&aev)))
        {
3559 3560 3561
          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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          goto err;
        }
        mi->rli.relay_log.harvest_bytes_written(&mi->rli.log_space_total) ;
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3565 3566 3567 3568 3569
      }
    }
  }
  error=0;
err:
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3570
  DBUG_RETURN(error);
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3571
}
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3572

3573

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3574
/*
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3575 3576 3577 3578
  Start using a new binary log on the master

  SYNOPSIS
    process_io_rotate()
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3579 3580
    mi                  master_info for the slave
    rev                 The rotate log event read from the binary log
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3581 3582

  DESCRIPTION
3583
    Updates the master info with the place in the next binary
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3584
    log where we should start reading.
3585
    Rotate the relay log to avoid mixed-format relay logs.
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3586 3587 3588 3589 3590

  NOTES
    We assume we already locked mi->data_lock

  RETURN VALUES
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3591 3592
    0           ok
    1           Log event is illegal
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3593 3594 3595

*/

3596
static int process_io_rotate(Master_info *mi, Rotate_log_event *rev)
3597
{
3598
  DBUG_ENTER("process_io_rotate");
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3599
  mysql_mutex_assert_owner(&mi->data_lock);
3600

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3601
  if (unlikely(!rev->is_valid()))
3602
    DBUG_RETURN(1);
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3603

3604
  /* Safe copy as 'rev' has been "sanitized" in Rotate_log_event's ctor */
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3605 3606
  memcpy(mi->master_log_name, rev->new_log_ident, rev->ident_len+1);
  mi->master_log_pos= rev->pos;
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3607
  DBUG_PRINT("info", ("master_log_pos: '%s' %lu",
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3608
                      mi->master_log_name, (ulong) mi->master_log_pos));
3609
#ifndef DBUG_OFF
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3610 3611 3612 3613 3614
  /*
    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)
3615
    mi->events_till_disconnect++;
3616
#endif
3617

3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631
  /*
    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)
  {
    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);
  }
3632 3633 3634 3635
  /*
    Rotate the relay log makes binlog format detection easier (at next slave
    start or mysqlbinlog)
  */
3636
  DBUG_RETURN(rotate_relay_log(mi) /* will take the right mutexes */);
3637 3638
}

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3639
/*
3640 3641
  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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3642
*/
3643
static int queue_binlog_ver_1_event(Master_info *mi, const char *buf,
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3644
                           ulong event_len)
3645
{
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3646
  const char *errmsg = 0;
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3647 3648 3649
  ulong inc_pos;
  bool ignore_event= 0;
  char *tmp_buf = 0;
3650
  Relay_log_info *rli= &mi->rli;
3651
  DBUG_ENTER("queue_binlog_ver_1_event");
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3652

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3653 3654 3655
  /*
    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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3656 3657 3658 3659 3660
  */
  if (buf[EVENT_TYPE_OFFSET] == LOAD_EVENT)
  {
    if (unlikely(!(tmp_buf=(char*)my_malloc(event_len+1,MYF(MY_WME)))))
    {
3661 3662
      mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR,
                 ER(ER_SLAVE_FATAL_ERROR), "Memory allocation failed");
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3663
      DBUG_RETURN(1);
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3664 3665
    }
    memcpy(tmp_buf,buf,event_len);
3666 3667 3668 3669 3670 3671 3672 3673
    /*
      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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3674
    int4store(tmp_buf+EVENT_LEN_OFFSET, event_len);
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3675 3676
    buf = (const char*)tmp_buf;
  }
3677 3678 3679 3680 3681 3682
  /*
    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).
  */
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3683
  Log_event *ev = Log_event::read_log_event(buf,event_len, &errmsg,
3684
                                            mi->rli.relay_log.description_event_for_queue);
3685
  if (unlikely(!ev))
3686 3687
  {
    sql_print_error("Read invalid event from master: '%s',\
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3688
 master could be corrupt but a more likely cause of this is a bug",
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3689
                    errmsg);
3690
    my_free(tmp_buf);
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3691
    DBUG_RETURN(1);
3692
  }
3693

Marc Alff's avatar
Marc Alff committed
3694
  mysql_mutex_lock(&mi->data_lock);
3695
  ev->log_pos= mi->master_log_pos; /* 3.23 events don't contain log_pos */
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3696
  switch (ev->get_type_code()) {
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3697
  case STOP_EVENT:
3698
    ignore_event= 1;
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3699 3700
    inc_pos= event_len;
    break;
3701
  case ROTATE_EVENT:
3702
    if (unlikely(process_io_rotate(mi,(Rotate_log_event*)ev)))
3703 3704
    {
      delete ev;
Marc Alff's avatar
Marc Alff committed
3705
      mysql_mutex_unlock(&mi->data_lock);
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3706
      DBUG_RETURN(1);
3707
    }
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3708
    inc_pos= 0;
3709
    break;
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3710
  case CREATE_FILE_EVENT:
3711 3712 3713 3714 3715 3716
    /*
      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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3717
  {
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3718
    /* We come here when and only when tmp_buf != 0 */
3719
    DBUG_ASSERT(tmp_buf != 0);
3720 3721
    inc_pos=event_len;
    ev->log_pos+= inc_pos;
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3722
    int error = process_io_create_file(mi,(Create_file_log_event*)ev);
3723
    delete ev;
3724
    mi->master_log_pos += inc_pos;
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3725
    DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
Marc Alff's avatar
Marc Alff committed
3726
    mysql_mutex_unlock(&mi->data_lock);
3727
    my_free(tmp_buf);
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3728
    DBUG_RETURN(error);
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3729
  }
3730
  default:
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3731
    inc_pos= event_len;
3732 3733
    break;
  }
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3734
  if (likely(!ignore_event))
3735
  {
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3736 3737
    if (ev->log_pos)
      /*
3738 3739 3740 3741
         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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3742
    if (unlikely(rli->relay_log.append(ev)))
3743 3744
    {
      delete ev;
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Marc Alff committed
3745
      mysql_mutex_unlock(&mi->data_lock);
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3746
      DBUG_RETURN(1);
3747
    }
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3748
    rli->relay_log.harvest_bytes_written(&rli->log_space_total);
3749 3750
  }
  delete ev;
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3751
  mi->master_log_pos+= inc_pos;
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3752
  DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
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Marc Alff committed
3753
  mysql_mutex_unlock(&mi->data_lock);
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3754
  DBUG_RETURN(0);
3755 3756
}

3757 3758 3759 3760
/*
  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.
*/
3761
static int queue_binlog_ver_3_event(Master_info *mi, const char *buf,
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3762
                           ulong event_len)
3763 3764 3765 3766
{
  const char *errmsg = 0;
  ulong inc_pos;
  char *tmp_buf = 0;
3767
  Relay_log_info *rli= &mi->rli;
3768 3769 3770 3771 3772 3773 3774 3775 3776
  DBUG_ENTER("queue_binlog_ver_3_event");

  /* read_log_event() will adjust log_pos to be end_log_pos */
  Log_event *ev = Log_event::read_log_event(buf,event_len, &errmsg,
                                            mi->rli.relay_log.description_event_for_queue);
  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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3777
                    errmsg);
3778
    my_free(tmp_buf);
3779 3780
    DBUG_RETURN(1);
  }
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Marc Alff committed
3781
  mysql_mutex_lock(&mi->data_lock);
3782 3783 3784 3785 3786 3787 3788
  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;
Marc Alff's avatar
Marc Alff committed
3789
      mysql_mutex_unlock(&mi->data_lock);
3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800
      DBUG_RETURN(1);
    }
    inc_pos= 0;
    break;
  default:
    inc_pos= event_len;
    break;
  }
  if (unlikely(rli->relay_log.append(ev)))
  {
    delete ev;
Marc Alff's avatar
Marc Alff committed
3801
    mysql_mutex_unlock(&mi->data_lock);
3802 3803 3804 3805 3806 3807
    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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3808
  DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
Marc Alff's avatar
Marc Alff committed
3809
  mysql_mutex_unlock(&mi->data_lock);
3810 3811 3812 3813 3814 3815 3816 3817 3818 3819
  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.

unknown's avatar
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3820
  TODO:
3821 3822 3823 3824
    Test this code before release - it has to be tested on a separate
    setup with 3.23 master or 4.0 master
*/

3825
static int queue_old_event(Master_info *mi, const char *buf,
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3826
                           ulong event_len)
3827
{
3828 3829
  DBUG_ENTER("queue_old_event");

3830 3831 3832
  switch (mi->rli.relay_log.description_event_for_queue->binlog_version)
  {
  case 1:
3833
      DBUG_RETURN(queue_binlog_ver_1_event(mi,buf,event_len));
3834
  case 3:
3835
      DBUG_RETURN(queue_binlog_ver_3_event(mi,buf,event_len));
3836 3837
  default: /* unsupported format; eg version 2 */
    DBUG_PRINT("info",("unsupported binlog format %d in queue_old_event()",
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3838
                       mi->rli.relay_log.description_event_for_queue->binlog_version));
3839
    DBUG_RETURN(1);
3840 3841
  }
}
3842

unknown's avatar
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3843
/*
3844 3845
  queue_event()

3846 3847 3848 3849 3850
  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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3851 3852
*/

3853
static int queue_event(Master_info* mi,const char* buf, ulong event_len)
3854
{
unknown's avatar
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3855
  int error= 0;
Andrei Elkin's avatar
Andrei Elkin committed
3856
  String error_msg;
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3857
  ulong inc_pos;
3858
  Relay_log_info *rli= &mi->rli;
Marc Alff's avatar
Marc Alff committed
3859
  mysql_mutex_t *log_lock= rli->relay_log.get_log_lock();
Andrei Elkin's avatar
Andrei Elkin committed
3860
  ulong s_id;
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3861 3862
  DBUG_ENTER("queue_event");

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3863 3864
  LINT_INIT(inc_pos);

3865 3866
  if (mi->rli.relay_log.description_event_for_queue->binlog_version<4 &&
      buf[EVENT_TYPE_OFFSET] != FORMAT_DESCRIPTION_EVENT /* a way to escape */)
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3867
    DBUG_RETURN(queue_old_event(mi,buf,event_len));
3868

3869
  LINT_INIT(inc_pos);
Marc Alff's avatar
Marc Alff committed
3870
  mysql_mutex_lock(&mi->data_lock);
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3871

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3872
  switch (buf[EVENT_TYPE_OFFSET]) {
3873
  case STOP_EVENT:
3874 3875
    /*
      We needn't write this event to the relay log. Indeed, it just indicates a
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3876 3877 3878
      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
3879
      prepared statements' deletion are TODO only when we binlog prep stmts).
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3880

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3881 3882 3883 3884
      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).
3885 3886
    */
    goto err;
3887 3888
  case ROTATE_EVENT:
  {
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3889
    Rotate_log_event rev(buf,event_len,mi->rli.relay_log.description_event_for_queue);
3890
    if (unlikely(process_io_rotate(mi,&rev)))
unknown's avatar
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3891
    {
Andrei Elkin's avatar
Andrei Elkin committed
3892
      error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
3893
      goto err;
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3894
    }
3895 3896 3897 3898
    /*
      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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3899
    inc_pos= 0;
3900 3901
    break;
  }
3902 3903 3904 3905 3906 3907 3908
  case FORMAT_DESCRIPTION_EVENT:
  {
    /*
      Create an event, and save it (when we rotate the relay log, we will have
      to write this event again).
    */
    /*
3909 3910 3911
      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).
3912
    */
3913
    Format_description_log_event* tmp;
3914
    const char* errmsg;
3915
    if (!(tmp= (Format_description_log_event*)
3916
          Log_event::read_log_event(buf, event_len, &errmsg,
3917
                                    mi->rli.relay_log.description_event_for_queue)))
3918
    {
Andrei Elkin's avatar
Andrei Elkin committed
3919
      error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
3920 3921
      goto err;
    }
3922 3923
    delete mi->rli.relay_log.description_event_for_queue;
    mi->rli.relay_log.description_event_for_queue= tmp;
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3924
    /*
3925
       Though this does some conversion to the slave's format, this will
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3926
       preserve the master's binlog format version, and number of event types.
3927
    */
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3928
    /*
3929
       If the event was not requested by the slave (the slave did not ask for
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3930
       it), i.e. has end_log_pos=0, we do not increment mi->master_log_pos
3931 3932 3933
    */
    inc_pos= uint4korr(buf+LOG_POS_OFFSET) ? event_len : 0;
    DBUG_PRINT("info",("binlog format is now %d",
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3934
                       mi->rli.relay_log.description_event_for_queue->binlog_version));
3935 3936 3937

  }
  break;
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Andrei Elkin committed
3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986

  case HEARTBEAT_LOG_EVENT:
  {
    /*
      HB (heartbeat) cannot come before RL (Relay)
    */
    char  llbuf[22];
    Heartbeat_log_event hb(buf, event_len, mi->rli.relay_log.description_event_for_queue);
    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.
       Slave can not have a difference in coordinates except in the only
       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).

       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)
        || mi->master_log_pos != hb.log_pos)
    {
      /* 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;
3987

3988
  default:
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3989
    inc_pos= event_len;
3990 3991
    break;
  }
3992

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3993 3994
  /*
     If this event is originating from this server, don't queue it.
3995
     We don't check this for 3.23 events because it's simpler like this; 3.23
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3996 3997
     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
3998 3999 4000 4001 4002 4003 4004 4005
     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!).
  */

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4006
  mysql_mutex_lock(log_lock);
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Andrei Elkin committed
4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018
  s_id= uint4korr(buf + SERVER_ID_OFFSET);
  if ((s_id == ::server_id && !mi->rli.replicate_same_server_id) ||
      /*
        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 */
4019 4020
        (buf[EVENT_TYPE_OFFSET] != FORMAT_DESCRIPTION_EVENT &&
         buf[EVENT_TYPE_OFFSET] != ROTATE_EVENT))))
4021
  {
4022 4023
    /*
      Do not write it to the relay log.
4024 4025 4026 4027 4028 4029 4030 4031
      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.
4032 4033 4034
      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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4035 4036 4037
      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.
4038
    */
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4039
    if (!(s_id == ::server_id && !mi->rli.replicate_same_server_id) ||
4040 4041 4042
        (buf[EVENT_TYPE_OFFSET] != FORMAT_DESCRIPTION_EVENT &&
         buf[EVENT_TYPE_OFFSET] != ROTATE_EVENT &&
         buf[EVENT_TYPE_OFFSET] != STOP_EVENT))
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4043
    {
4044
      mi->master_log_pos+= inc_pos;
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4045 4046 4047 4048
      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;
    }
4049
    rli->relay_log.signal_update(); // the slave SQL thread needs to re-check
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4050 4051
    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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4053 4054 4055
  else
  {
    /* write the event to the relay log */
4056
    if (likely(!(rli->relay_log.appendv(buf,event_len,0))))
4057 4058
    {
      mi->master_log_pos+= inc_pos;
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4059
      DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
4060 4061
      rli->relay_log.harvest_bytes_written(&rli->log_space_total);
    }
4062
    else
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4063 4064 4065
    {
      error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
    }
4066
    rli->ign_master_log_name_end[0]= 0; // last event is not ignored
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4067
  }
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4068
  mysql_mutex_unlock(log_lock);
4069

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4070 4071
skip_relay_logging:
  
4072
err:
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4073
  mysql_mutex_unlock(&mi->data_lock);
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4074
  DBUG_PRINT("info", ("error: %d", error));
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4075 4076 4077 4078 4079
  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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4080
  DBUG_RETURN(error);
4081 4082
}

4083

4084
void end_relay_log_info(Relay_log_info* rli)
4085
{
4086 4087
  DBUG_ENTER("end_relay_log_info");

4088
  if (!rli->inited)
4089
    DBUG_VOID_RETURN;
4090
  if (rli->info_fd >= 0)
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4091 4092
  {
    end_io_cache(&rli->info_file);
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4093
    mysql_file_close(rli->info_fd, MYF(MY_WME));
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    rli->info_fd = -1;
  }
4096
  if (rli->cur_log_fd >= 0)
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  {
    end_io_cache(&rli->cache_buf);
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4099
    mysql_file_close(rli->cur_log_fd, MYF(MY_WME));
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    rli->cur_log_fd = -1;
  }
4102
  rli->inited = 0;
4103
  rli->relay_log.close(LOG_CLOSE_INDEX | LOG_CLOSE_STOP_EVENT);
4104
  rli->relay_log.harvest_bytes_written(&rli->log_space_total);
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4105 4106 4107 4108 4109 4110
  /*
    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();
4111
  DBUG_VOID_RETURN;
4112 4113
}

4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132

/**
  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;
4133
  if (thd && thd->slave_thread)
4134 4135 4136 4137 4138
    thd->clear_active_vio();
#endif
}


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4139 4140
/*
  Try to connect until successful or slave killed
4141

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  SYNPOSIS
    safe_connect()
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    thd                 Thread handler for slave
    mysql               MySQL connection handle
    mi                  Replication handle
4147

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  RETURN
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    0   ok
    #   Error
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*/
4152

4153
static int safe_connect(THD* thd, MYSQL* mysql, Master_info* mi)
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4154
{
4155 4156 4157
  DBUG_ENTER("safe_connect");

  DBUG_RETURN(connect_to_master(thd, mysql, mi, 0, 0));
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}

4160

4161
/*
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4162 4163
  SYNPOSIS
    connect_to_master()
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4164

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  IMPLEMENTATION
    Try to connect until successful or slave killed or we have retried
    master_retry_count times
4168
*/
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4169

4170
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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4172
{
4173
  int slave_was_killed;
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  int last_errno= -2;                           // impossible error
4175
  ulong err_count=0;
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  char llbuff[22];
4177
  DBUG_ENTER("connect_to_master");
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4178

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4179
#ifndef DBUG_OFF
4180
  mi->events_till_disconnect = disconnect_slave_event_count;
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4181
#endif
4182
  ulong client_flag= CLIENT_REMEMBER_OPTIONS;
4183
  if (opt_slave_compressed_protocol)
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    client_flag=CLIENT_COMPRESS;                /* We will use compression */
4185

4186 4187
  mysql_options(mysql, MYSQL_OPT_CONNECT_TIMEOUT, (char *) &slave_net_timeout);
  mysql_options(mysql, MYSQL_OPT_READ_TIMEOUT, (char *) &slave_net_timeout);
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4188

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4189 4190
#ifdef HAVE_OPENSSL
  if (mi->ssl)
4191
  {
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4192
    mysql_ssl_set(mysql,
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4193
                  mi->ssl_key[0]?mi->ssl_key:0,
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4194
                  mi->ssl_cert[0]?mi->ssl_cert:0,
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4195 4196 4197
                  mi->ssl_ca[0]?mi->ssl_ca:0,
                  mi->ssl_capath[0]?mi->ssl_capath:0,
                  mi->ssl_cipher[0]?mi->ssl_cipher:0);
4198 4199 4200
    mysql_options(mysql, MYSQL_OPT_SSL_VERIFY_SERVER_CERT,
                  &mi->ssl_verify_server_cert);
  }
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#endif

4203 4204 4205 4206
  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);

4207
  while (!(slave_was_killed = io_slave_killed(thd,mi)) &&
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4208 4209 4210
         (reconnect ? mysql_reconnect(mysql) != 0 :
          mysql_real_connect(mysql, mi->host, mi->user, mi->password, 0,
                             mi->port, 0, client_flag) == 0))
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4211
  {
4212
    /* Don't repeat last error */
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SCRUM  
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4213
    if ((int)mysql_errno(mysql) != last_errno)
4214
    {
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SCRUM  
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4215
      last_errno=mysql_errno(mysql);
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4216
      suppress_warnings= 0;
4217 4218 4219 4220 4221 4222
      mi->report(ERROR_LEVEL, last_errno,
                 "error %s to master '%s@%s:%d'"
                 " - retry-time: %d  retries: %lu",
                 (reconnect ? "reconnecting" : "connecting"),
                 mi->user, mi->host, mi->port,
                 mi->connect_retry, master_retry_count);
4223
    }
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4224 4225 4226
    /*
      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
4227
      do not want to have election triggered on the first failure to
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4228
      connect
4229
    */
4230
    if (++err_count == master_retry_count)
4231 4232
    {
      slave_was_killed=1;
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4233 4234
      if (reconnect)
        change_rpl_status(RPL_ACTIVE_SLAVE,RPL_LOST_SOLDIER);
4235 4236
      break;
    }
4237
    safe_sleep(thd,mi->connect_retry,(CHECK_KILLED_FUNC)io_slave_killed,
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4238
               (void*)mi);
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4239
  }
4240

4241 4242
  if (!slave_was_killed)
  {
4243
    mi->clear_error(); // clear possible left over reconnect error
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4244
    if (reconnect)
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4245
    {
4246
      if (!suppress_warnings && global_system_variables.log_warnings)
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4247
        sql_print_information("Slave: connected to master '%s@%s:%d',\
4248
replication resumed in log '%s' at position %s", mi->user,
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4249 4250 4251
                        mi->host, mi->port,
                        IO_RPL_LOG_NAME,
                        llstr(mi->master_log_pos,llbuff));
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4252
    }
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4253 4254 4255
    else
    {
      change_rpl_status(RPL_IDLE_SLAVE,RPL_ACTIVE_SLAVE);
4256 4257
      general_log_print(thd, COM_CONNECT_OUT, "%s@%s:%d",
                        mi->user, mi->host, mi->port);
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4258
    }
4259
#ifdef SIGNAL_WITH_VIO_CLOSE
4260
    thd->set_active_vio(mysql->net.vio);
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4261
#endif
4262
  }
4263
  mysql->reconnect= 1;
4264 4265
  DBUG_PRINT("exit",("slave_was_killed: %d", slave_was_killed));
  DBUG_RETURN(slave_was_killed);
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4266 4267
}

4268

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4269
/*
4270
  safe_reconnect()
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4271

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4272 4273 4274
  IMPLEMENTATION
    Try to connect until successful or slave killed or we have retried
    master_retry_count times
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4275 4276
*/

4277
static int safe_reconnect(THD* thd, MYSQL* mysql, Master_info* mi,
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4278
                          bool suppress_warnings)
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4279
{
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4280 4281
  DBUG_ENTER("safe_reconnect");
  DBUG_RETURN(connect_to_master(thd, mysql, mi, 1, suppress_warnings));
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4282 4283
}

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4284

He Zhenxing's avatar
He Zhenxing committed
4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349
MYSQL *rpl_connect_master(MYSQL *mysql)
{
  THD *thd= current_thd;
  Master_info *mi= my_pthread_getspecific_ptr(Master_info*, RPL_MASTER_INFO);
  if (!mi)
  {
    sql_print_error("'rpl_connect_master' must be called in slave I/O thread context.");
    return NULL;
  }

  bool allocated= false;
  
  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);

#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);

  if (io_slave_killed(thd, mi)
      || !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;
}

4350 4351 4352 4353 4354 4355
/*
  Store the file and position where the execute-slave thread are in the
  relay log.

  SYNOPSIS
    flush_relay_log_info()
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4356
    rli                 Relay log information
4357 4358

  NOTES
4359 4360 4361
    - 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.
4362 4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375
    - 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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4376 4377
    0   ok
    1   write error
4378 4379
*/

4380
bool flush_relay_log_info(Relay_log_info* rli)
4381
{
4382
  bool error=0;
4383
  DBUG_ENTER("flush_relay_log_info");
4384 4385

  if (unlikely(rli->no_storage))
4386
    DBUG_RETURN(0);
4387

4388 4389 4390
  IO_CACHE *file = &rli->info_file;
  char buff[FN_REFLEN*2+22*2+4], *pos;

4391
  my_b_seek(file, 0L);
4392
  pos=strmov(buff, rli->group_relay_log_name);
4393
  *pos++='\n';
4394
  pos=longlong2str(rli->group_relay_log_pos, pos, 10);
4395
  *pos++='\n';
4396
  pos=strmov(pos, rli->group_master_log_name);
4397
  *pos++='\n';
4398
  pos=longlong2str(rli->group_master_log_pos, pos, 10);
4399
  *pos='\n';
4400
  if (my_b_write(file, (uchar*) buff, (size_t) (pos-buff)+1))
4401 4402 4403
    error=1;
  if (flush_io_cache(file))
    error=1;
4404 4405 4406 4407 4408 4409 4410 4411
  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;
  }
4412 4413 4414 4415
  /* 
    Flushing the relay log is done by the slave I/O thread 
    or by the user on STOP SLAVE. 
   */
4416
  DBUG_RETURN(error);
4417 4418
}

4419

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4420
/*
4421
  Called when we notice that the current "hot" log got rotated under our feet.
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4422 4423
*/

4424
static IO_CACHE *reopen_relay_log(Relay_log_info *rli, const char **errmsg)
4425
{
4426
  DBUG_ENTER("reopen_relay_log");
4427 4428
  DBUG_ASSERT(rli->cur_log != &rli->cache_buf);
  DBUG_ASSERT(rli->cur_log_fd == -1);
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4429 4430

  IO_CACHE *cur_log = rli->cur_log=&rli->cache_buf;
4431
  if ((rli->cur_log_fd=open_binlog(cur_log,rli->event_relay_log_name,
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4432
                                   errmsg)) <0)
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4433
    DBUG_RETURN(0);
4434 4435
  /*
    We want to start exactly where we was before:
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4436 4437
    relay_log_pos       Current log pos
    pending             Number of bytes already processed from the event
4438
  */
4439
  rli->event_relay_log_pos= max(rli->event_relay_log_pos, BIN_LOG_HEADER_SIZE);
4440
  my_b_seek(cur_log,rli->event_relay_log_pos);
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4441
  DBUG_RETURN(cur_log);
4442 4443
}

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4444

4445 4446 4447 4448 4449 4450 4451 4452 4453 4454
/**
  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.
*/
4455
static Log_event* next_event(Relay_log_info* rli)
4456 4457 4458
{
  Log_event* ev;
  IO_CACHE* cur_log = rli->cur_log;
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4459
  mysql_mutex_t *log_lock = rli->relay_log.get_log_lock();
4460 4461
  const char* errmsg=0;
  THD* thd = rli->sql_thd;
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  DBUG_ENTER("next_event");
4463

4464 4465
  DBUG_ASSERT(thd != 0);

4466 4467 4468 4469 4470
#ifndef DBUG_OFF
  if (abort_slave_event_count && !rli->events_till_abort--)
    DBUG_RETURN(0);
#endif

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4471 4472
  /*
    For most operations we need to protect rli members with data_lock,
4473 4474 4475
    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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4476
    mysql_cond_wait() with the non-data_lock mutex
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  */
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4478
  mysql_mutex_assert_owner(&rli->data_lock);
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4479

4480
  while (!sql_slave_killed(thd,rli))
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4481 4482 4483
  {
    /*
      We can have two kinds of log reading:
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4484 4485 4486 4487 4488 4489 4490 4491
      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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4492
    */
4493 4494 4495 4496
    bool hot_log;
    if ((hot_log = (cur_log != &rli->cache_buf)))
    {
      DBUG_ASSERT(rli->cur_log_fd == -1); // foreign descriptor
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4497
      mysql_mutex_lock(log_lock);
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4498 4499

      /*
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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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4502
      */
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4503
      if (rli->relay_log.get_open_count() != rli->cur_log_old_open_count)
4504
      {
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4505 4506
        // 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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Marc Alff committed
4507
        mysql_mutex_unlock(log_lock);
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4508 4509 4510
        if (!cur_log)                           // No more log files
          goto err;
        hot_log=0;                              // Using old binary log
4511 4512
      }
    }
4513 4514 4515 4516 4517 4518 4519
    /* 
      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;
4520 4521
#ifndef DBUG_OFF
    {
4522
      /* This is an assertion which sometimes fails, let's try to track it */
4523
      char llbuf1[22], llbuf2[22];
4524
      DBUG_PRINT("info", ("my_b_tell(cur_log)=%s rli->event_relay_log_pos=%s",
4525
                          llstr(my_b_tell(cur_log),llbuf1),
4526 4527 4528
                          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);
4529 4530
    }
#endif
unknown's avatar
unknown committed
4531 4532
    /*
      Relay log is always in new format - if the master is 3.23, the
4533
      I/O thread will convert the format for us.
4534 4535
      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
4536 4537
      logs, which may even have been deleted. So we need to write this
      description event at the beginning of the relay log.
4538 4539
      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.
4540
      But if the relay log is created by new_file(): then the solution is:
4541
      MYSQL_BIN_LOG::open() will write the buffered description event.
unknown's avatar
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4542
    */
4543 4544
    if ((ev=Log_event::read_log_event(cur_log,0,
                                      rli->relay_log.description_event_for_exec)))
4545

4546 4547
    {
      DBUG_ASSERT(thd==rli->sql_thd);
4548 4549 4550 4551 4552
      /*
        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);
4553
      if (hot_log)
Marc Alff's avatar
Marc Alff committed
4554
        mysql_mutex_unlock(log_lock);
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4555
      DBUG_RETURN(ev);
4556 4557
    }
    DBUG_ASSERT(thd==rli->sql_thd);
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4558
    if (opt_reckless_slave)                     // For mysql-test
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4559
      cur_log->error = 0;
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4560
    if (cur_log->error < 0)
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4561 4562
    {
      errmsg = "slave SQL thread aborted because of I/O error";
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4563
      if (hot_log)
Marc Alff's avatar
Marc Alff committed
4564
        mysql_mutex_unlock(log_lock);
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4565 4566
      goto err;
    }
4567 4568
    if (!cur_log->error) /* EOF */
    {
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4569
      /*
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4570 4571 4572
        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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4573
      */
4574 4575
      if (hot_log)
      {
4576 4577 4578 4579 4580 4581 4582 4583 4584 4585
        /*
          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").
4586 4587 4588 4589 4590 4591 4592 4593 4594 4595

          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.
4596
        */
4597
        time_t save_timestamp= rli->last_master_timestamp;
4598 4599
        rli->last_master_timestamp= 0;

unknown's avatar
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4600
        DBUG_ASSERT(rli->relay_log.get_open_count() ==
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4601
                    rli->cur_log_old_open_count);
4602 4603 4604 4605 4606

        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"));
4607
          ev= new Rotate_log_event(rli->ign_master_log_name_end,
4608
                                   0, rli->ign_master_log_pos_end,
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4609
                                   Rotate_log_event::DUP_NAME);
4610
          rli->ign_master_log_name_end[0]= 0;
Marc Alff's avatar
Marc Alff committed
4611
          mysql_mutex_unlock(log_lock);
4612 4613 4614 4615 4616 4617 4618 4619 4620 4621
          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);
        }

unknown's avatar
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4622 4623 4624 4625
        /*
          We can, and should release data_lock while we are waiting for
          update. If we do not, show slave status will block
        */
Marc Alff's avatar
Marc Alff committed
4626
        mysql_mutex_unlock(&rli->data_lock);
4627 4628

        /*
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4629
          Possible deadlock :
4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640
          - 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
unknown's avatar
unknown committed
4641
          master does not send anything). Then the I/O thread stops waiting
4642 4643
          and reads more events.
          The SQL thread decides when the I/O thread should take log_space_limit
unknown's avatar
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4644
          into account again : ignore_log_space_limit is reset to 0
4645 4646 4647 4648
          in purge_first_log (when the SQL thread purges the just-read relay
          log), and also when the SQL thread starts. 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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4649 4650
          be stopped, and the SQL thread sets ignore_log_space_limit to 0 when
          it stops.
4651
        */
Marc Alff's avatar
Marc Alff committed
4652
        mysql_mutex_lock(&rli->log_space_lock);
4653
        // prevent the I/O thread from blocking next times
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unknown committed
4654
        rli->ignore_log_space_limit= 1;
4655
        /*
4656 4657 4658 4659
          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.
4660
        */
Marc Alff's avatar
Marc Alff committed
4661 4662
        mysql_mutex_unlock(&rli->log_space_lock);
        mysql_cond_broadcast(&rli->log_space_cond);
Andrei Elkin's avatar
Andrei Elkin committed
4663 4664
        // Note that wait_for_update_relay_log unlocks lock_log !
        rli->relay_log.wait_for_update_relay_log(rli->sql_thd);
4665
        // re-acquire data lock since we released it earlier
Marc Alff's avatar
Marc Alff committed
4666
        mysql_mutex_lock(&rli->data_lock);
4667
        rli->last_master_timestamp= save_timestamp;
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4668
        continue;
4669
      }
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4670
      /*
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4671 4672 4673
        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
unknown's avatar
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4674 4675 4676
      */
      end_io_cache(cur_log);
      DBUG_ASSERT(rli->cur_log_fd >= 0);
Marc Alff's avatar
Marc Alff committed
4677
      mysql_file_close(rli->cur_log_fd, MYF(MY_WME));
unknown's avatar
unknown committed
4678
      rli->cur_log_fd = -1;
unknown's avatar
unknown committed
4679

4680
      if (relay_log_purge)
unknown's avatar
unknown committed
4681
      {
unknown's avatar
unknown committed
4682
        /*
4683 4684 4685 4686 4687 4688 4689 4690 4691 4692
          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
        */
unknown's avatar
unknown committed
4693
        if (rli->relay_log.purge_first_log
4694 4695 4696
            (rli,
             rli->group_relay_log_pos == rli->event_relay_log_pos
             && !strcmp(rli->group_relay_log_name,rli->event_relay_log_name)))
unknown's avatar
unknown committed
4697 4698 4699 4700
        {
          errmsg = "Error purging processed logs";
          goto err;
        }
unknown's avatar
unknown committed
4701
      }
4702 4703
      else
      {
unknown's avatar
unknown committed
4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719
        /*
          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;
        strmake(rli->event_relay_log_name,rli->linfo.log_file_name,
                sizeof(rli->event_relay_log_name)-1);
        flush_relay_log_info(rli);
unknown's avatar
unknown committed
4720
      }
4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733

      /*
        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 */
Marc Alff's avatar
Marc Alff committed
4734
        mysql_mutex_lock(log_lock);
unknown's avatar
unknown committed
4735 4736
      if (rli->relay_log.is_active(rli->linfo.log_file_name))
      {
4737
#ifdef EXTRA_DEBUG
unknown's avatar
unknown committed
4738 4739
        if (global_system_variables.log_warnings)
          sql_print_information("next log '%s' is currently active",
4740
                                rli->linfo.log_file_name);
unknown's avatar
unknown committed
4741 4742 4743 4744 4745 4746
#endif
        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);

        /*
4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803
           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.
unknown's avatar
unknown committed
4804
        */
4805 4806

        my_b_seek(cur_log, (my_off_t) 0);
unknown's avatar
unknown committed
4807
        if (check_binlog_magic(cur_log,&errmsg))
4808
        {
Marc Alff's avatar
Marc Alff committed
4809 4810
          if (!hot_log)
            mysql_mutex_unlock(log_lock);
unknown's avatar
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4811
          goto err;
4812
        }
Marc Alff's avatar
Marc Alff committed
4813 4814
        if (!hot_log)
          mysql_mutex_unlock(log_lock);
unknown's avatar
unknown committed
4815
        continue;
4816
      }
Marc Alff's avatar
Marc Alff committed
4817 4818
      if (!hot_log)
        mysql_mutex_unlock(log_lock);
unknown's avatar
unknown committed
4819
      /*
unknown's avatar
unknown committed
4820 4821 4822
        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.
unknown's avatar
unknown committed
4823 4824
      */
#ifdef EXTRA_DEBUG
unknown's avatar
unknown committed
4825
      if (global_system_variables.log_warnings)
unknown's avatar
unknown committed
4826
        sql_print_information("next log '%s' is not active",
4827
                              rli->linfo.log_file_name);
unknown's avatar
unknown committed
4828
#endif
unknown's avatar
unknown committed
4829 4830
      // open_binlog() will check the magic header
      if ((rli->cur_log_fd=open_binlog(cur_log,rli->linfo.log_file_name,
unknown's avatar
unknown committed
4831 4832
                                       &errmsg)) <0)
        goto err;
4833
    }
unknown's avatar
unknown committed
4834
    else
4835
    {
unknown's avatar
unknown committed
4836
      /*
unknown's avatar
unknown committed
4837 4838
        Read failed with a non-EOF error.
        TODO: come up with something better to handle this error
unknown's avatar
unknown committed
4839 4840
      */
      if (hot_log)
Marc Alff's avatar
Marc Alff committed
4841
        mysql_mutex_unlock(log_lock);
4842
      sql_print_error("Slave SQL thread: I/O error reading \
unknown's avatar
unknown committed
4843
event(errno: %d  cur_log->error: %d)",
unknown's avatar
unknown committed
4844
                      my_errno,cur_log->error);
unknown's avatar
unknown committed
4845
      // set read position to the beginning of the event
4846
      my_b_seek(cur_log,rli->event_relay_log_pos);
unknown's avatar
unknown committed
4847 4848
      /* otherwise, we have had a partial read */
      errmsg = "Aborting slave SQL thread because of partial event read";
unknown's avatar
unknown committed
4849
      break;                                    // To end of function
4850 4851
    }
  }
4852
  if (!errmsg && global_system_variables.log_warnings)
4853
  {
unknown's avatar
unknown committed
4854
    sql_print_information("Error reading relay log event: %s",
4855 4856 4857
                          "slave SQL thread was killed");
    DBUG_RETURN(0);
  }
unknown's avatar
unknown committed
4858

4859
err:
4860 4861
  if (errmsg)
    sql_print_error("Error reading relay log event: %s", errmsg);
unknown's avatar
unknown committed
4862
  DBUG_RETURN(0);
4863 4864
}

4865 4866 4867
/*
  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
unknown's avatar
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4868
  locks; here we don't, so this function is mainly taking locks).
4869 4870
  Returns nothing as we cannot catch any error (MYSQL_BIN_LOG::new_file()
  is void).
4871 4872
*/

4873
int rotate_relay_log(Master_info* mi)
4874 4875
{
  DBUG_ENTER("rotate_relay_log");
4876
  Relay_log_info* rli= &mi->rli;
4877
  int error= 0;
unknown's avatar
unknown committed
4878

Luis Soares's avatar
Luis Soares committed
4879
  DBUG_EXECUTE_IF("crash_before_rotate_relaylog", DBUG_SUICIDE(););
4880

unknown's avatar
unknown committed
4881
  /*
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4882 4883 4884
     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).
  */
4885 4886
  if (!rli->inited)
  {
unknown's avatar
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4887
    DBUG_PRINT("info", ("rli->inited == 0"));
unknown's avatar
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4888
    goto end;
4889
  }
unknown's avatar
unknown committed
4890

4891
  /* If the relay log is closed, new_file() will do nothing. */
4892 4893
  if ((error= rli->relay_log.new_file()))
    goto end;
unknown's avatar
unknown committed
4894

4895 4896 4897 4898
  /*
    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:
unknown's avatar
unknown committed
4899 4900 4901 4902 4903 4904
    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.
4905 4906 4907 4908
    If the log is closed, then this will just harvest the last writes, probably
    0 as they probably have been harvested.
  */
  rli->relay_log.harvest_bytes_written(&rli->log_space_total);
unknown's avatar
unknown committed
4909
end:
4910
  DBUG_RETURN(error);
4911 4912
}

unknown's avatar
unknown committed
4913

unknown's avatar
unknown committed
4914 4915 4916
/**
   Detects, based on master's version (as found in the relay log), if master
   has a certain bug.
4917
   @param rli Relay_log_info which tells the master's version
unknown's avatar
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4918
   @param bug_id Number of the bug as found in bugs.mysql.com
4919
   @param report bool report error message, default TRUE
4920 4921 4922 4923 4924 4925 4926

   @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.

unknown's avatar
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4927 4928
   @return TRUE if master has the bug, FALSE if it does not.
*/
4929 4930
bool rpl_master_has_bug(const Relay_log_info *rli, uint bug_id, bool report,
                        bool (*pred)(const void *), const void *param)
unknown's avatar
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4931 4932 4933 4934 4935 4936 4937 4938
{
  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[]=
  {
unknown's avatar
unknown committed
4939
    {24432, { 5, 0, 24 }, { 5, 0, 38 } },
4940 4941 4942
    {24432, { 5, 1, 12 }, { 5, 1, 17 } },
    {33029, { 5, 0,  0 }, { 5, 0, 58 } },
    {33029, { 5, 1,  0 }, { 5, 1, 12 } },
4943
    {37426, { 5, 1,  0 }, { 5, 1, 26 } },
unknown's avatar
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4944 4945 4946 4947 4948 4949 4950 4951 4952 4953 4954 4955 4956
  };
  const uchar *master_ver=
    rli->relay_log.description_event_for_exec->server_version_split;

  DBUG_ASSERT(sizeof(rli->relay_log.description_event_for_exec->server_version_split) == 3);

  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) &&
4957 4958
        (memcmp(fixed_in,      master_ver, 3) >  0) &&
        (pred == NULL || (*pred)(param)))
unknown's avatar
unknown committed
4959
    {
4960 4961
      if (!report)
	return TRUE;
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4962 4963 4964 4965 4966
      // 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)
{
  if (active_mi && active_mi->rli.sql_thd == thd)
  {
    Relay_log_info *rli= &active_mi->rli;
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    DBUG_EXECUTE_IF("simulate_bug33029", return TRUE;);
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    return rpl_master_has_bug(rli, 33029, FALSE, NULL, NULL);
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  }
  return FALSE;
}

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#ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
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template class I_List_iterator<i_string>;
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template class I_List_iterator<i_string_pair>;
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#endif
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/**
  @} (end of group Replication)
*/

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#endif /* HAVE_REPLICATION */