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Commit 69d92fb1 authored by unknown's avatar unknown
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Refactoring: Moved rli code to new file rpl_rli.cc. The idea being that rli 

should be a separate module (i.e. a class) to make it easier to maintain the 
code, e.g. by having checks within the rli checking sanity of data and making 
member variables private.  This will also ease implementation of multi-source 
and, at least in my fantasies :), make it possible in some future to have 
separate replication servers.


sql/Makefile.am:
  Added file rpl_rli.cc
sql/repl_failsafe.cc:
  Move function
sql/rpl_rli.h:
  moved functions
sql/slave.cc:
  Moved rli code into rpl_rli.cc
sql/sql_repl.cc:
  Changed function to be member function
sql/rpl_rli.cc:
  Code for rli
parent b7d43470
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Showing with 1207 additions and 1161 deletions
sql/Makefile.am
View file @ 69d92fb1
......@@ -93,7 +93,7 @@ mysqld_SOURCES = sql_lex.cc sql_handler.cc sql_partition.cc \
sql_load.cc mf_iocache.cc field_conv.cc sql_show.cc \
sql_udf.cc sql_analyse.cc sql_analyse.h sql_cache.cc \
slave.cc sql_repl.cc rpl_filter.cc rpl_tblmap.cc \
rpl_utility.cc rpl_injector.cc \
rpl_utility.cc rpl_injector.cc rpl_rli.cc \
sql_union.cc sql_derived.cc \
client.c sql_client.cc mini_client_errors.c pack.c\
stacktrace.c repl_failsafe.h repl_failsafe.cc \
......
sql/repl_failsafe.cc
View file @ 69d92fb1
......@@ -962,7 +962,7 @@ bool load_master_data(THD* thd)
Cancel the previous START SLAVE UNTIL, as the fact to download
a new copy logically makes UNTIL irrelevant.
*/
clear_until_condition(&active_mi->rli);
active_mi->rli.clear_until_condition();
/*
No need to update rli.event* coordinates, they will be when the slave
......
sql/rpl_rli.cc 0 → 100644
View file @ 69d92fb1
/* Copyright (C) 2000-2003 MySQL AB
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
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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.
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 */
#include "mysql_priv.h"
#include "rpl_rli.h"
#include <my_dir.h> // For MY_STAT
#include "sql_repl.h" // For check_binlog_magic
static int count_relay_log_space(RELAY_LOG_INFO* rli);
// Defined in slave.cc
int init_intvar_from_file(int* var, IO_CACHE* f, int default_val);
int init_strvar_from_file(char *var, int max_size, IO_CACHE *f,
const char *default_val);
st_relay_log_info::st_relay_log_info()
:no_storage(FALSE), info_fd(-1), cur_log_fd(-1), save_temporary_tables(0),
cur_log_old_open_count(0), group_master_log_pos(0), log_space_total(0),
ignore_log_space_limit(0), last_master_timestamp(0), slave_skip_counter(0),
abort_pos_wait(0), slave_run_id(0), sql_thd(0), last_slave_errno(0),
inited(0), abort_slave(0), slave_running(0), until_condition(UNTIL_NONE),
until_log_pos(0), retried_trans(0),
tables_to_lock(0), tables_to_lock_count(0),
m_reload_flags(RELOAD_NONE_F),
unsafe_to_stop_at(0)
{
DBUG_ENTER("st_relay_log_info::st_relay_log_info");
group_relay_log_name[0]= event_relay_log_name[0]=
group_master_log_name[0]= 0;
last_slave_error[0]= until_log_name[0]= ign_master_log_name_end[0]= 0;
bzero((char*) &info_file, sizeof(info_file));
bzero((char*) &cache_buf, sizeof(cache_buf));
cached_charset_invalidate();
pthread_mutex_init(&run_lock, MY_MUTEX_INIT_FAST);
pthread_mutex_init(&data_lock, MY_MUTEX_INIT_FAST);
pthread_mutex_init(&log_space_lock, MY_MUTEX_INIT_FAST);
pthread_cond_init(&data_cond, NULL);
pthread_cond_init(&start_cond, NULL);
pthread_cond_init(&stop_cond, NULL);
pthread_cond_init(&log_space_cond, NULL);
relay_log.init_pthread_objects();
DBUG_VOID_RETURN;
}
st_relay_log_info::~st_relay_log_info()
{
DBUG_ENTER("st_relay_log_info::~st_relay_log_info");
pthread_mutex_destroy(&run_lock);
pthread_mutex_destroy(&data_lock);
pthread_mutex_destroy(&log_space_lock);
pthread_cond_destroy(&data_cond);
pthread_cond_destroy(&start_cond);
pthread_cond_destroy(&stop_cond);
pthread_cond_destroy(&log_space_cond);
relay_log.cleanup();
DBUG_VOID_RETURN;
}
int init_relay_log_info(RELAY_LOG_INFO* rli,
const char* info_fname)
{
char fname[FN_REFLEN+128];
int info_fd;
const char* msg = 0;
int error = 0;
DBUG_ENTER("init_relay_log_info");
DBUG_ASSERT(!rli->no_storage); // Don't init if there is no storage
if (rli->inited) // Set if this function called
DBUG_RETURN(0);
fn_format(fname, info_fname, mysql_data_home, "", 4+32);
pthread_mutex_lock(&rli->data_lock);
info_fd = rli->info_fd;
rli->cur_log_fd = -1;
rli->slave_skip_counter=0;
rli->abort_pos_wait=0;
rli->log_space_limit= relay_log_space_limit;
rli->log_space_total= 0;
rli->tables_to_lock= 0;
rli->tables_to_lock_count= 0;
/*
The relay log will now be opened, as a SEQ_READ_APPEND IO_CACHE.
Note that the I/O thread flushes it to disk after writing every
event, in flush_master_info(mi, 1).
*/
/*
For the maximum log size, we choose max_relay_log_size if it is
non-zero, max_binlog_size otherwise. If later the user does SET
GLOBAL on one of these variables, fix_max_binlog_size and
fix_max_relay_log_size will reconsider the choice (for example
if the user changes max_relay_log_size to zero, we have to
switch to using max_binlog_size for the relay log) and update
rli->relay_log.max_size (and mysql_bin_log.max_size).
*/
{
char buf[FN_REFLEN];
const char *ln;
static bool name_warning_sent= 0;
ln= rli->relay_log.generate_name(opt_relay_logname, "-relay-bin",
1, buf);
/* We send the warning only at startup, not after every RESET SLAVE */
if (!opt_relay_logname && !opt_relaylog_index_name && !name_warning_sent)
{
/*
User didn't give us info to name the relay log index file.
Picking `hostname`-relay-bin.index like we do, causes replication to
fail if this slave's hostname is changed later. So, we would like to
instead require a name. But as we don't want to break many existing
setups, we only give warning, not error.
*/
sql_print_warning("Neither --relay-log nor --relay-log-index were used;"
" so replication "
"may break when this MySQL server acts as a "
"slave and has his hostname changed!! Please "
"use '--relay-log=%s' to avoid this problem.", ln);
name_warning_sent= 1;
}
/*
note, that if open() fails, we'll still have index file open
but a destructor will take care of that
*/
if (rli->relay_log.open_index_file(opt_relaylog_index_name, ln) ||
rli->relay_log.open(ln, LOG_BIN, 0, SEQ_READ_APPEND, 0,
(max_relay_log_size ? max_relay_log_size :
max_binlog_size), 1))
{
pthread_mutex_unlock(&rli->data_lock);
sql_print_error("Failed in open_log() called from init_relay_log_info()");
DBUG_RETURN(1);
}
}
/* if file does not exist */
if (access(fname,F_OK))
{
/*
If someone removed the file from underneath our feet, just close
the old descriptor and re-create the old file
*/
if (info_fd >= 0)
my_close(info_fd, MYF(MY_WME));
if ((info_fd = my_open(fname, O_CREAT|O_RDWR|O_BINARY, MYF(MY_WME))) < 0)
{
sql_print_error("Failed to create a new relay log info file (\
file '%s', errno %d)", fname, my_errno);
msg= current_thd->net.last_error;
goto err;
}
if (init_io_cache(&rli->info_file, info_fd, IO_SIZE*2, READ_CACHE, 0L,0,
MYF(MY_WME)))
{
sql_print_error("Failed to create a cache on relay log info file '%s'",
fname);
msg= current_thd->net.last_error;
goto err;
}
/* Init relay log with first entry in the relay index file */
if (init_relay_log_pos(rli,NullS,BIN_LOG_HEADER_SIZE,0 /* no data lock */,
&msg, 0))
{
sql_print_error("Failed to open the relay log 'FIRST' (relay_log_pos 4)");
goto err;
}
rli->group_master_log_name[0]= 0;
rli->group_master_log_pos= 0;
rli->info_fd= info_fd;
}
else // file exists
{
if (info_fd >= 0)
reinit_io_cache(&rli->info_file, READ_CACHE, 0L,0,0);
else
{
int error=0;
if ((info_fd = my_open(fname, O_RDWR|O_BINARY, MYF(MY_WME))) < 0)
{
sql_print_error("\
Failed to open the existing relay log info file '%s' (errno %d)",
fname, my_errno);
error= 1;
}
else if (init_io_cache(&rli->info_file, info_fd,
IO_SIZE*2, READ_CACHE, 0L, 0, MYF(MY_WME)))
{
sql_print_error("Failed to create a cache on relay log info file '%s'",
fname);
error= 1;
}
if (error)
{
if (info_fd >= 0)
my_close(info_fd, MYF(0));
rli->info_fd= -1;
rli->relay_log.close(LOG_CLOSE_INDEX | LOG_CLOSE_STOP_EVENT);
pthread_mutex_unlock(&rli->data_lock);
DBUG_RETURN(1);
}
}
rli->info_fd = info_fd;
int relay_log_pos, master_log_pos;
if (init_strvar_from_file(rli->group_relay_log_name,
sizeof(rli->group_relay_log_name),
&rli->info_file, "") ||
init_intvar_from_file(&relay_log_pos,
&rli->info_file, BIN_LOG_HEADER_SIZE) ||
init_strvar_from_file(rli->group_master_log_name,
sizeof(rli->group_master_log_name),
&rli->info_file, "") ||
init_intvar_from_file(&master_log_pos, &rli->info_file, 0))
{
msg="Error reading slave log configuration";
goto err;
}
strmake(rli->event_relay_log_name,rli->group_relay_log_name,
sizeof(rli->event_relay_log_name)-1);
rli->group_relay_log_pos= rli->event_relay_log_pos= relay_log_pos;
rli->group_master_log_pos= master_log_pos;
if (init_relay_log_pos(rli,
rli->group_relay_log_name,
rli->group_relay_log_pos,
0 /* no data lock*/,
&msg, 0))
{
char llbuf[22];
sql_print_error("Failed to open the relay log '%s' (relay_log_pos %s)",
rli->group_relay_log_name,
llstr(rli->group_relay_log_pos, llbuf));
goto err;
}
}
#ifndef DBUG_OFF
{
char llbuf1[22], llbuf2[22];
DBUG_PRINT("info", ("my_b_tell(rli->cur_log)=%s rli->event_relay_log_pos=%s",
llstr(my_b_tell(rli->cur_log),llbuf1),
llstr(rli->event_relay_log_pos,llbuf2)));
DBUG_ASSERT(rli->event_relay_log_pos >= BIN_LOG_HEADER_SIZE);
DBUG_ASSERT(my_b_tell(rli->cur_log) == rli->event_relay_log_pos);
}
#endif
/*
Now change the cache from READ to WRITE - must do this
before flush_relay_log_info
*/
reinit_io_cache(&rli->info_file, WRITE_CACHE,0L,0,1);
if ((error= flush_relay_log_info(rli)))
sql_print_error("Failed to flush relay log info file");
if (count_relay_log_space(rli))
{
msg="Error counting relay log space";
goto err;
}
rli->inited= 1;
pthread_mutex_unlock(&rli->data_lock);
DBUG_RETURN(error);
err:
sql_print_error(msg);
end_io_cache(&rli->info_file);
if (info_fd >= 0)
my_close(info_fd, MYF(0));
rli->info_fd= -1;
rli->relay_log.close(LOG_CLOSE_INDEX | LOG_CLOSE_STOP_EVENT);
pthread_mutex_unlock(&rli->data_lock);
DBUG_RETURN(1);
}
static inline int add_relay_log(RELAY_LOG_INFO* rli,LOG_INFO* linfo)
{
MY_STAT s;
DBUG_ENTER("add_relay_log");
if (!my_stat(linfo->log_file_name,&s,MYF(0)))
{
sql_print_error("log %s listed in the index, but failed to stat",
linfo->log_file_name);
DBUG_RETURN(1);
}
rli->log_space_total += s.st_size;
#ifndef DBUG_OFF
char buf[22];
DBUG_PRINT("info",("log_space_total: %s", llstr(rli->log_space_total,buf)));
#endif
DBUG_RETURN(0);
}
static int count_relay_log_space(RELAY_LOG_INFO* rli)
{
LOG_INFO linfo;
DBUG_ENTER("count_relay_log_space");
rli->log_space_total= 0;
if (rli->relay_log.find_log_pos(&linfo, NullS, 1))
{
sql_print_error("Could not find first log while counting relay log space");
DBUG_RETURN(1);
}
do
{
if (add_relay_log(rli,&linfo))
DBUG_RETURN(1);
} while (!rli->relay_log.find_next_log(&linfo, 1));
/*
As we have counted everything, including what may have written in a
preceding write, we must reset bytes_written, or we may count some space
twice.
*/
rli->relay_log.reset_bytes_written();
DBUG_RETURN(0);
}
void st_relay_log_info::clear_slave_error()
{
DBUG_ENTER("clear_slave_error");
/* Clear the errors displayed by SHOW SLAVE STATUS */
last_slave_error[0]= 0;
last_slave_errno= 0;
DBUG_VOID_RETURN;
}
/*
Reset UNTIL condition for RELAY_LOG_INFO
SYNOPSYS
clear_until_condition()
rli - RELAY_LOG_INFO structure where UNTIL condition should be reset
*/
void st_relay_log_info::clear_until_condition()
{
DBUG_ENTER("clear_until_condition");
until_condition= RELAY_LOG_INFO::UNTIL_NONE;
until_log_name[0]= 0;
until_log_pos= 0;
DBUG_VOID_RETURN;
}
/*
Open the given relay log
SYNOPSIS
init_relay_log_pos()
rli Relay information (will be initialized)
log Name of relay log file to read from. NULL = First log
pos Position in relay log file
need_data_lock Set to 1 if this functions should do mutex locks
errmsg Store pointer to error message here
look_for_description_event
1 if we should look for such an event. We only need
this when the SQL thread starts and opens an existing
relay log and has to execute it (possibly from an
offset >4); then we need to read the first event of
the relay log to be able to parse the events we have
to execute.
DESCRIPTION
- Close old open relay log files.
- If we are using the same relay log as the running IO-thread, then set
rli->cur_log to point to the same IO_CACHE entry.
- If not, open the 'log' binary file.
TODO
- check proper initialization of group_master_log_name/group_master_log_pos
RETURN VALUES
0 ok
1 error. errmsg is set to point to the error message
*/
int init_relay_log_pos(RELAY_LOG_INFO* rli,const char* log,
ulonglong pos, bool need_data_lock,
const char** errmsg,
bool look_for_description_event)
{
DBUG_ENTER("init_relay_log_pos");
DBUG_PRINT("info", ("pos=%lu", pos));
*errmsg=0;
pthread_mutex_t *log_lock=rli->relay_log.get_log_lock();
if (need_data_lock)
pthread_mutex_lock(&rli->data_lock);
/*
Slave threads are not the only users of init_relay_log_pos(). CHANGE MASTER
is, too, and init_slave() too; these 2 functions allocate a description
event in init_relay_log_pos, which is not freed by the terminating SQL slave
thread as that thread is not started by these functions. So we have to free
the description_event here, in case, so that there is no memory leak in
running, say, CHANGE MASTER.
*/
delete rli->relay_log.description_event_for_exec;
/*
By default the relay log is in binlog format 3 (4.0).
Even if format is 4, this will work enough to read the first event
(Format_desc) (remember that format 4 is just lenghtened compared to format
3; format 3 is a prefix of format 4).
*/
rli->relay_log.description_event_for_exec= new
Format_description_log_event(3);
pthread_mutex_lock(log_lock);
/* Close log file and free buffers if it's already open */
if (rli->cur_log_fd >= 0)
{
end_io_cache(&rli->cache_buf);
my_close(rli->cur_log_fd, MYF(MY_WME));
rli->cur_log_fd = -1;
}
rli->group_relay_log_pos = rli->event_relay_log_pos = pos;
/*
Test to see if the previous run was with the skip of purging
If yes, we do not purge when we restart
*/
if (rli->relay_log.find_log_pos(&rli->linfo, NullS, 1))
{
*errmsg="Could not find first log during relay log initialization";
goto err;
}
if (log && rli->relay_log.find_log_pos(&rli->linfo, log, 1))
{
*errmsg="Could not find target log during relay log initialization";
goto err;
}
strmake(rli->group_relay_log_name,rli->linfo.log_file_name,
sizeof(rli->group_relay_log_name)-1);
strmake(rli->event_relay_log_name,rli->linfo.log_file_name,
sizeof(rli->event_relay_log_name)-1);
if (rli->relay_log.is_active(rli->linfo.log_file_name))
{
/*
The IO thread is using this log file.
In this case, we will use the same IO_CACHE pointer to
read data as the IO thread is using to write data.
*/
my_b_seek((rli->cur_log=rli->relay_log.get_log_file()), (off_t)0);
if (check_binlog_magic(rli->cur_log,errmsg))
goto err;
rli->cur_log_old_open_count=rli->relay_log.get_open_count();
}
else
{
/*
Open the relay log and set rli->cur_log to point at this one
*/
if ((rli->cur_log_fd=open_binlog(&rli->cache_buf,
rli->linfo.log_file_name,errmsg)) < 0)
goto err;
rli->cur_log = &rli->cache_buf;
}
/*
In all cases, check_binlog_magic() has been called so we're at offset 4 for
sure.
*/
if (pos > BIN_LOG_HEADER_SIZE) /* If pos<=4, we stay at 4 */
{
Log_event* ev;
while (look_for_description_event)
{
/*
Read the possible Format_description_log_event; if position
was 4, no need, it will be read naturally.
*/
DBUG_PRINT("info",("looking for a Format_description_log_event"));
if (my_b_tell(rli->cur_log) >= pos)
break;
/*
Because of we have rli->data_lock and log_lock, we can safely read an
event
*/
if (!(ev=Log_event::read_log_event(rli->cur_log,0,
rli->relay_log.description_event_for_exec)))
{
DBUG_PRINT("info",("could not read event, rli->cur_log->error=%d",
rli->cur_log->error));
if (rli->cur_log->error) /* not EOF */
{
*errmsg= "I/O error reading event at position 4";
goto err;
}
break;
}
else if (ev->get_type_code() == FORMAT_DESCRIPTION_EVENT)
{
DBUG_PRINT("info",("found Format_description_log_event"));
delete rli->relay_log.description_event_for_exec;
rli->relay_log.description_event_for_exec= (Format_description_log_event*) ev;
/*
As ev was returned by read_log_event, it has passed is_valid(), so
my_malloc() in ctor worked, no need to check again.
*/
/*
Ok, we found a Format_description event. But it is not sure that this
describes the whole relay log; indeed, one can have this sequence
(starting from position 4):
Format_desc (of slave)
Rotate (of master)
Format_desc (of master)
So the Format_desc which really describes the rest of the relay log
is the 3rd event (it can't be further than that, because we rotate
the relay log when we queue a Rotate event from the master).
But what describes the Rotate is the first Format_desc.
So what we do is:
go on searching for Format_description events, until you exceed the
position (argument 'pos') or until you find another event than Rotate
or Format_desc.
*/
}
else
{
DBUG_PRINT("info",("found event of another type=%d",
ev->get_type_code()));
look_for_description_event= (ev->get_type_code() == ROTATE_EVENT);
delete ev;
}
}
my_b_seek(rli->cur_log,(off_t)pos);
#ifndef DBUG_OFF
{
char llbuf1[22], llbuf2[22];
DBUG_PRINT("info", ("my_b_tell(rli->cur_log)=%s rli->event_relay_log_pos=%s",
llstr(my_b_tell(rli->cur_log),llbuf1),
llstr(rli->event_relay_log_pos,llbuf2)));
}
#endif
}
err:
/*
If we don't purge, we can't honour relay_log_space_limit ;
silently discard it
*/
if (!relay_log_purge)
rli->log_space_limit= 0;
pthread_cond_broadcast(&rli->data_cond);
pthread_mutex_unlock(log_lock);
if (need_data_lock)
pthread_mutex_unlock(&rli->data_lock);
if (!rli->relay_log.description_event_for_exec->is_valid() && !*errmsg)
*errmsg= "Invalid Format_description log event; could be out of memory";
DBUG_RETURN ((*errmsg) ? 1 : 0);
}
/*
Waits until the SQL thread reaches (has executed up to) the
log/position or timed out.
SYNOPSIS
wait_for_pos()
thd client thread that sent SELECT MASTER_POS_WAIT
log_name log name to wait for
log_pos position to wait for
timeout timeout in seconds before giving up waiting
NOTES
timeout is longlong whereas it should be ulong ; but this is
to catch if the user submitted a negative timeout.
RETURN VALUES
-2 improper arguments (log_pos<0)
or slave not running, or master info changed
during the function's execution,
or client thread killed. -2 is translated to NULL by caller
-1 timed out
>=0 number of log events the function had to wait
before reaching the desired log/position
*/
int st_relay_log_info::wait_for_pos(THD* thd, String* log_name,
longlong log_pos,
longlong timeout)
{
int event_count = 0;
ulong init_abort_pos_wait;
int error=0;
struct timespec abstime; // for timeout checking
const char *msg;
DBUG_ENTER("st_relay_log_info::wait_for_pos");
if (!inited)
DBUG_RETURN(-1);
DBUG_PRINT("enter",("log_name: '%s' log_pos: %lu timeout: %lu",
log_name->c_ptr(), (ulong) log_pos, (ulong) timeout));
set_timespec(abstime,timeout);
pthread_mutex_lock(&data_lock);
msg= thd->enter_cond(&data_cond, &data_lock,
"Waiting for the slave SQL thread to "
"advance position");
/*
This function will abort when it notices that some CHANGE MASTER or
RESET MASTER has changed the master info.
To catch this, these commands modify abort_pos_wait ; We just monitor
abort_pos_wait and see if it has changed.
Why do we have this mechanism instead of simply monitoring slave_running
in the loop (we do this too), as CHANGE MASTER/RESET SLAVE require that
the SQL thread be stopped?
This is becasue if someones does:
STOP SLAVE;CHANGE MASTER/RESET SLAVE; START SLAVE;
the change may happen very quickly and we may not notice that
slave_running briefly switches between 1/0/1.
*/
init_abort_pos_wait= abort_pos_wait;
/*
We'll need to
handle all possible log names comparisons (e.g. 999 vs 1000).
We use ulong for string->number conversion ; this is no
stronger limitation than in find_uniq_filename in sql/log.cc
*/
ulong log_name_extension;
char log_name_tmp[FN_REFLEN]; //make a char[] from String
strmake(log_name_tmp, log_name->ptr(), min(log_name->length(), FN_REFLEN-1));
char *p= fn_ext(log_name_tmp);
char *p_end;
if (!*p || log_pos<0)
{
error= -2; //means improper arguments
goto err;
}
// Convert 0-3 to 4
log_pos= max(log_pos, BIN_LOG_HEADER_SIZE);
/* p points to '.' */
log_name_extension= strtoul(++p, &p_end, 10);
/*
p_end points to the first invalid character.
If it equals to p, no digits were found, error.
If it contains '\0' it means conversion went ok.
*/
if (p_end==p || *p_end)
{
error= -2;
goto err;
}
/* The "compare and wait" main loop */
while (!thd->killed &&
init_abort_pos_wait == abort_pos_wait &&
slave_running)
{
bool pos_reached;
int cmp_result= 0;
DBUG_PRINT("info",
("init_abort_pos_wait: %ld abort_pos_wait: %ld",
init_abort_pos_wait, abort_pos_wait));
DBUG_PRINT("info",("group_master_log_name: '%s' pos: %lu",
group_master_log_name, (ulong) group_master_log_pos));
/*
group_master_log_name can be "", if we are just after a fresh
replication start or after a CHANGE MASTER TO MASTER_HOST/PORT
(before we have executed one Rotate event from the master) or
(rare) if the user is doing a weird slave setup (see next
paragraph). If group_master_log_name is "", we assume we don't
have enough info to do the comparison yet, so we just wait until
more data. In this case master_log_pos is always 0 except if
somebody (wrongly) sets this slave to be a slave of itself
without using --replicate-same-server-id (an unsupported
configuration which does nothing), then group_master_log_pos
will grow and group_master_log_name will stay "".
*/
if (*group_master_log_name)
{
char *basename= (group_master_log_name +
dirname_length(group_master_log_name));
/*
First compare the parts before the extension.
Find the dot in the master's log basename,
and protect against user's input error :
if the names do not match up to '.' included, return error
*/
char *q= (char*)(fn_ext(basename)+1);
if (strncmp(basename, log_name_tmp, (int)(q-basename)))
{
error= -2;
break;
}
// Now compare extensions.
char *q_end;
ulong group_master_log_name_extension= strtoul(q, &q_end, 10);
if (group_master_log_name_extension < log_name_extension)
cmp_result= -1 ;
else
cmp_result= (group_master_log_name_extension > log_name_extension) ? 1 : 0 ;
pos_reached= ((!cmp_result && group_master_log_pos >= (ulonglong)log_pos) ||
cmp_result > 0);
if (pos_reached || thd->killed)
break;
}
//wait for master update, with optional timeout.
DBUG_PRINT("info",("Waiting for master update"));
/*
We are going to pthread_cond_(timed)wait(); if the SQL thread stops it
will wake us up.
*/
if (timeout > 0)
{
/*
Note that pthread_cond_timedwait checks for the timeout
before for the condition ; i.e. it returns ETIMEDOUT
if the system time equals or exceeds the time specified by abstime
before the condition variable is signaled or broadcast, _or_ if
the absolute time specified by abstime has already passed at the time
of the call.
For that reason, pthread_cond_timedwait will do the "timeoutting" job
even if its condition is always immediately signaled (case of a loaded
master).
*/
error=pthread_cond_timedwait(&data_cond, &data_lock, &abstime);
}
else
pthread_cond_wait(&data_cond, &data_lock);
DBUG_PRINT("info",("Got signal of master update or timed out"));
if (error == ETIMEDOUT || error == ETIME)
{
error= -1;
break;
}
error=0;
event_count++;
DBUG_PRINT("info",("Testing if killed or SQL thread not running"));
}
err:
thd->exit_cond(msg);
DBUG_PRINT("exit",("killed: %d abort: %d slave_running: %d \
improper_arguments: %d timed_out: %d",
thd->killed_errno(),
(int) (init_abort_pos_wait != abort_pos_wait),
(int) slave_running,
(int) (error == -2),
(int) (error == -1)));
if (thd->killed || init_abort_pos_wait != abort_pos_wait ||
!slave_running)
{
error= -2;
}
DBUG_RETURN( error ? error : event_count );
}
void st_relay_log_info::inc_group_relay_log_pos(ulonglong log_pos,
bool skip_lock)
{
DBUG_ENTER("st_relay_log_info::inc_group_relay_log_pos");
if (!skip_lock)
pthread_mutex_lock(&data_lock);
inc_event_relay_log_pos();
group_relay_log_pos= event_relay_log_pos;
strmake(group_relay_log_name,event_relay_log_name,
sizeof(group_relay_log_name)-1);
notify_group_relay_log_name_update();
/*
If the slave does not support transactions and replicates a transaction,
users should not trust group_master_log_pos (which they can display with
SHOW SLAVE STATUS or read from relay-log.info), because to compute
group_master_log_pos the slave relies on log_pos stored in the master's
binlog, but if we are in a master's transaction these positions are always
the BEGIN's one (excepted for the COMMIT), so group_master_log_pos does
not advance as it should on the non-transactional slave (it advances by
big leaps, whereas it should advance by small leaps).
*/
/*
In 4.x we used the event's len to compute the positions here. This is
wrong if the event was 3.23/4.0 and has been converted to 5.0, because
then the event's len is not what is was in the master's binlog, so this
will make a wrong group_master_log_pos (yes it's a bug in 3.23->4.0
replication: Exec_master_log_pos is wrong). Only way to solve this is to
have the original offset of the end of the event the relay log. This is
what we do in 5.0: log_pos has become "end_log_pos" (because the real use
of log_pos in 4.0 was to compute the end_log_pos; so better to store
end_log_pos instead of begin_log_pos.
If we had not done this fix here, the problem would also have appeared
when the slave and master are 5.0 but with different event length (for
example the slave is more recent than the master and features the event
UID). It would give false MASTER_POS_WAIT, false Exec_master_log_pos in
SHOW SLAVE STATUS, and so the user would do some CHANGE MASTER using this
value which would lead to badly broken replication.
Even the relay_log_pos will be corrupted in this case, because the len is
the relay log is not "val".
With the end_log_pos solution, we avoid computations involving lengthes.
*/
DBUG_PRINT("info", ("log_pos: %lu group_master_log_pos: %lu",
(long) log_pos, (long) group_master_log_pos));
if (log_pos) // 3.23 binlogs don't have log_posx
{
group_master_log_pos= log_pos;
}
pthread_cond_broadcast(&data_cond);
if (!skip_lock)
pthread_mutex_unlock(&data_lock);
DBUG_VOID_RETURN;
}
void st_relay_log_info::close_temporary_tables()
{
TABLE *table,*next;
DBUG_ENTER("st_relay_log_info::close_temporary_tables");
for (table=save_temporary_tables ; table ; table=next)
{
next=table->next;
/*
Don't ask for disk deletion. For now, anyway they will be deleted when
slave restarts, but it is a better intention to not delete them.
*/
DBUG_PRINT("info", ("table: %p", table));
close_temporary(table, 1, 0);
}
save_temporary_tables= 0;
slave_open_temp_tables= 0;
DBUG_VOID_RETURN;
}
/*
purge_relay_logs()
NOTES
Assumes to have a run lock on rli and that no slave thread are running.
*/
int purge_relay_logs(RELAY_LOG_INFO* rli, THD *thd, bool just_reset,
const char** errmsg)
{
int error=0;
DBUG_ENTER("purge_relay_logs");
/*
Even if rli->inited==0, we still try to empty rli->master_log_* variables.
Indeed, rli->inited==0 does not imply that they already are empty.
It could be that slave's info initialization partly succeeded :
for example if relay-log.info existed but *relay-bin*.*
have been manually removed, init_relay_log_info reads the old
relay-log.info and fills rli->master_log_*, then init_relay_log_info
checks for the existence of the relay log, this fails and
init_relay_log_info leaves rli->inited to 0.
In that pathological case, rli->master_log_pos* will be properly reinited
at the next START SLAVE (as RESET SLAVE or CHANGE
MASTER, the callers of purge_relay_logs, will delete bogus *.info files
or replace them with correct files), however if the user does SHOW SLAVE
STATUS before START SLAVE, he will see old, confusing rli->master_log_*.
In other words, we reinit rli->master_log_* for SHOW SLAVE STATUS
to display fine in any case.
*/
rli->group_master_log_name[0]= 0;
rli->group_master_log_pos= 0;
if (!rli->inited)
{
DBUG_PRINT("info", ("rli->inited == 0"));
DBUG_RETURN(0);
}
DBUG_ASSERT(rli->slave_running == 0);
DBUG_ASSERT(rli->mi->slave_running == 0);
rli->slave_skip_counter=0;
pthread_mutex_lock(&rli->data_lock);
/*
we close the relay log fd possibly left open by the slave SQL thread,
to be able to delete it; the relay log fd possibly left open by the slave
I/O thread will be closed naturally in reset_logs() by the
close(LOG_CLOSE_TO_BE_OPENED) call
*/
if (rli->cur_log_fd >= 0)
{
end_io_cache(&rli->cache_buf);
my_close(rli->cur_log_fd, MYF(MY_WME));
rli->cur_log_fd= -1;
}
if (rli->relay_log.reset_logs(thd))
{
*errmsg = "Failed during log reset";
error=1;
goto err;
}
/* Save name of used relay log file */
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(rli->event_relay_log_name)-1);
rli->group_relay_log_pos= rli->event_relay_log_pos= BIN_LOG_HEADER_SIZE;
if (count_relay_log_space(rli))
{
*errmsg= "Error counting relay log space";
goto err;
}
if (!just_reset)
error= init_relay_log_pos(rli, rli->group_relay_log_name,
rli->group_relay_log_pos,
0 /* do not need data lock */, errmsg, 0);
err:
#ifndef DBUG_OFF
char buf[22];
#endif
DBUG_PRINT("info",("log_space_total: %s",llstr(rli->log_space_total,buf)));
pthread_mutex_unlock(&rli->data_lock);
DBUG_RETURN(error);
}
/*
Check if condition stated in UNTIL clause of START SLAVE is reached.
SYNOPSYS
st_relay_log_info::is_until_satisfied()
DESCRIPTION
Checks if UNTIL condition is reached. Uses caching result of last
comparison of current log file name and target log file name. So cached
value should be invalidated if current log file name changes
(see st_relay_log_info::notify_... functions).
This caching is needed to avoid of expensive string comparisons and
strtol() conversions needed for log names comparison. We don't need to
compare them each time this function is called, we only need to do this
when current log name changes. If we have UNTIL_MASTER_POS condition we
need to do this only after Rotate_log_event::exec_event() (which is
rare, so caching gives real benifit), and if we have UNTIL_RELAY_POS
condition then we should invalidate cached comarison value after
inc_group_relay_log_pos() which called for each group of events (so we
have some benefit if we have something like queries that use
autoincrement or if we have transactions).
Should be called ONLY if until_condition != UNTIL_NONE !
RETURN VALUE
true - condition met or error happened (condition seems to have
bad log file name)
false - condition not met
*/
bool st_relay_log_info::is_until_satisfied()
{
const char *log_name;
ulonglong log_pos;
DBUG_ENTER("st_relay_log_info::is_until_satisfied");
DBUG_ASSERT(until_condition != UNTIL_NONE);
if (until_condition == UNTIL_MASTER_POS)
{
log_name= group_master_log_name;
log_pos= group_master_log_pos;
}
else
{ /* until_condition == UNTIL_RELAY_POS */
log_name= group_relay_log_name;
log_pos= group_relay_log_pos;
}
if (until_log_names_cmp_result == UNTIL_LOG_NAMES_CMP_UNKNOWN)
{
/*
We have no cached comparison results so we should compare log names
and cache result.
If we are after RESET SLAVE, and the SQL slave thread has not processed
any event yet, it could be that group_master_log_name is "". In that case,
just wait for more events (as there is no sensible comparison to do).
*/
if (*log_name)
{
const char *basename= log_name + dirname_length(log_name);
const char *q= (const char*)(fn_ext(basename)+1);
if (strncmp(basename, until_log_name, (int)(q-basename)) == 0)
{
/* Now compare extensions. */
char *q_end;
ulong log_name_extension= strtoul(q, &q_end, 10);
if (log_name_extension < until_log_name_extension)
until_log_names_cmp_result= UNTIL_LOG_NAMES_CMP_LESS;
else
until_log_names_cmp_result=
(log_name_extension > until_log_name_extension) ?
UNTIL_LOG_NAMES_CMP_GREATER : UNTIL_LOG_NAMES_CMP_EQUAL ;
}
else
{
/* Probably error so we aborting */
sql_print_error("Slave SQL thread is stopped because UNTIL "
"condition is bad.");
DBUG_RETURN(TRUE);
}
}
else
DBUG_RETURN(until_log_pos == 0);
}
DBUG_RETURN(((until_log_names_cmp_result == UNTIL_LOG_NAMES_CMP_EQUAL &&
log_pos >= until_log_pos) ||
until_log_names_cmp_result == UNTIL_LOG_NAMES_CMP_GREATER));
}
void st_relay_log_info::cached_charset_invalidate()
{
DBUG_ENTER("st_relay_log_info::cached_charset_invalidate");
/* Full of zeroes means uninitialized. */
bzero(cached_charset, sizeof(cached_charset));
DBUG_VOID_RETURN;
}
bool st_relay_log_info::cached_charset_compare(char *charset)
{
DBUG_ENTER("st_relay_log_info::cached_charset_compare");
if (bcmp(cached_charset, charset, sizeof(cached_charset)))
{
memcpy(cached_charset, charset, sizeof(cached_charset));
DBUG_RETURN(1);
}
DBUG_RETURN(0);
}
/*
Some system tables needed to be re-read by the MySQL server after it has
updated them; in statement-based replication, the GRANT and other commands
are sent verbatim to the slave which then reloads; in row-based replication,
changes to these tables are done through ordinary Rows binlog events, so
master must add some flag for the slave to know it has to reload the tables.
*/
struct st_reload_entry
{
char const *table;
st_relay_log_info::enum_reload_flag flag;
};
/*
Sorted array of table names, please keep it sorted since we are
using bsearch() on it below.
*/
static st_reload_entry s_mysql_tables[] =
{
{ "columns_priv", st_relay_log_info::RELOAD_GRANT_F },
{ "db", st_relay_log_info::RELOAD_ACCESS_F },
{ "host", st_relay_log_info::RELOAD_ACCESS_F },
{ "procs_priv", st_relay_log_info::RELOAD_GRANT_F },
{ "tables_priv", st_relay_log_info::RELOAD_GRANT_F },
{ "user", st_relay_log_info::RELOAD_ACCESS_F }
};
static const my_size_t s_mysql_tables_size =
sizeof(s_mysql_tables)/sizeof(*s_mysql_tables);
static int reload_entry_compare(const void *lhs, const void *rhs)
{
const char *lstr = static_cast<const char *>(lhs);
const char *rstr = static_cast<const st_reload_entry*>(rhs)->table;
DBUG_ENTER("reload_entry_compare");
DBUG_RETURN(strcmp(lstr, rstr));
}
void st_relay_log_info::touching_table(char const* db, char const* table,
ulong table_id)
{
DBUG_ENTER("st_relay_log_info::touching_table");
if (strcmp(db,"mysql") == 0)
{
#if defined(HAVE_BSEARCH) && defined(HAVE_SIZE_T)
void *const ptr= bsearch(table, s_mysql_tables,
s_mysql_tables_size,
sizeof(*s_mysql_tables), reload_entry_compare);
st_reload_entry const *const entry= static_cast<st_reload_entry*>(ptr);
#else
/*
Fall back to full scan, there are few rows anyway and updating the
"mysql" database is rare.
*/
st_reload_entry const *entry= s_mysql_tables;
for ( ; entry < s_mysql_tables + s_mysql_tables_size ; entry++)
if (reload_entry_compare(table, entry) == 0)
break;
#endif
if (entry)
m_reload_flags|= entry->flag;
}
DBUG_VOID_RETURN;
}
void st_relay_log_info::transaction_end(THD* thd)
{
DBUG_ENTER("st_relay_log_info::transaction_end");
if (m_reload_flags != RELOAD_NONE_F)
{
if (m_reload_flags & RELOAD_ACCESS_F)
acl_reload(thd);
if (m_reload_flags & RELOAD_GRANT_F)
grant_reload(thd);
m_reload_flags= RELOAD_NONE_F;
}
DBUG_VOID_RETURN;
}
#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
void st_relay_log_info::cleanup_context(THD *thd, bool error)
{
DBUG_ENTER("st_relay_log_info::cleanup_context");
DBUG_ASSERT(sql_thd == thd);
/*
1) Instances of Table_map_log_event, if ::exec_event() was called on them,
may have opened tables, which we cannot be sure have been closed (because
maybe the Rows_log_event have not been found or will not be, because slave
SQL thread is stopping, or relay log has a missing tail etc). So we close
all thread's tables. And so the table mappings have to be cancelled.
2) Rows_log_event::exec_event() may even have started statements or
transactions on them, which we need to rollback in case of error.
3) If finding a Format_description_log_event after a BEGIN, we also need
to rollback before continuing with the next events.
4) so we need this "context cleanup" function.
*/
if (error)
{
ha_autocommit_or_rollback(thd, 1); // if a "statement transaction"
end_trans(thd, ROLLBACK); // if a "real transaction"
}
m_table_map.clear_tables();
close_thread_tables(thd);
clear_tables_to_lock();
unsafe_to_stop_at= 0;
DBUG_VOID_RETURN;
}
#endif
sql/rpl_rli.h
View file @ 69d92fb1
......@@ -21,6 +21,7 @@
#include "rpl_tblmap.h"
/****************************************************************************
Replication SQL Thread
......@@ -164,6 +165,9 @@ typedef struct st_relay_log_info
time_t last_master_timestamp;
void clear_slave_error();
void clear_until_condition();
/*
Needed for problems when slave stops and we want to restart it
skipping one or more events in the master log that have caused
......@@ -322,4 +326,9 @@ typedef struct st_relay_log_info
time_t unsafe_to_stop_at;
} RELAY_LOG_INFO;
// Defined in rpl_rli.cc
int init_relay_log_info(RELAY_LOG_INFO* rli, const char* info_fname);
#endif /* RPL_RLI_H */
sql/slave.cc
View file @ 69d92fb1
......@@ -31,6 +31,7 @@
#include "rpl_tblmap.h"
#define MAX_SLAVE_RETRY_PAUSE 5
bool use_slave_mask = 0;
MY_BITMAP slave_error_mask;
......@@ -59,7 +60,6 @@ static int process_io_create_file(MASTER_INFO* mi, Create_file_log_event* cev);
static bool wait_for_relay_log_space(RELAY_LOG_INFO* rli);
static inline bool io_slave_killed(THD* thd,MASTER_INFO* mi);
static inline bool sql_slave_killed(THD* thd,RELAY_LOG_INFO* rli);
static int count_relay_log_space(RELAY_LOG_INFO* rli);
static int init_slave_thread(THD* thd, SLAVE_THD_TYPE thd_type);
static int safe_connect(THD* thd, MYSQL* mysql, MASTER_INFO* mi);
static int safe_reconnect(THD* thd, MYSQL* mysql, MASTER_INFO* mi,
......@@ -201,223 +201,6 @@ err:
}
/*
Open the given relay log
SYNOPSIS
init_relay_log_pos()
rli Relay information (will be initialized)
log Name of relay log file to read from. NULL = First log
pos Position in relay log file
need_data_lock Set to 1 if this functions should do mutex locks
errmsg Store pointer to error message here
look_for_description_event
1 if we should look for such an event. We only need
this when the SQL thread starts and opens an existing
relay log and has to execute it (possibly from an
offset >4); then we need to read the first event of
the relay log to be able to parse the events we have
to execute.
DESCRIPTION
- Close old open relay log files.
- If we are using the same relay log as the running IO-thread, then set
rli->cur_log to point to the same IO_CACHE entry.
- If not, open the 'log' binary file.
TODO
- check proper initialization of group_master_log_name/group_master_log_pos
RETURN VALUES
0 ok
1 error. errmsg is set to point to the error message
*/
int init_relay_log_pos(RELAY_LOG_INFO* rli,const char* log,
ulonglong pos, bool need_data_lock,
const char** errmsg,
bool look_for_description_event)
{
DBUG_ENTER("init_relay_log_pos");
DBUG_PRINT("info", ("pos=%lu", pos));
*errmsg=0;
pthread_mutex_t *log_lock=rli->relay_log.get_log_lock();
if (need_data_lock)
pthread_mutex_lock(&rli->data_lock);
/*
Slave threads are not the only users of init_relay_log_pos(). CHANGE MASTER
is, too, and init_slave() too; these 2 functions allocate a description
event in init_relay_log_pos, which is not freed by the terminating SQL slave
thread as that thread is not started by these functions. So we have to free
the description_event here, in case, so that there is no memory leak in
running, say, CHANGE MASTER.
*/
delete rli->relay_log.description_event_for_exec;
/*
By default the relay log is in binlog format 3 (4.0).
Even if format is 4, this will work enough to read the first event
(Format_desc) (remember that format 4 is just lenghtened compared to format
3; format 3 is a prefix of format 4).
*/
rli->relay_log.description_event_for_exec= new
Format_description_log_event(3);
pthread_mutex_lock(log_lock);
/* Close log file and free buffers if it's already open */
if (rli->cur_log_fd >= 0)
{
end_io_cache(&rli->cache_buf);
my_close(rli->cur_log_fd, MYF(MY_WME));
rli->cur_log_fd = -1;
}
rli->group_relay_log_pos = rli->event_relay_log_pos = pos;
/*
Test to see if the previous run was with the skip of purging
If yes, we do not purge when we restart
*/
if (rli->relay_log.find_log_pos(&rli->linfo, NullS, 1))
{
*errmsg="Could not find first log during relay log initialization";
goto err;
}
if (log && rli->relay_log.find_log_pos(&rli->linfo, log, 1))
{
*errmsg="Could not find target log during relay log initialization";
goto err;
}
strmake(rli->group_relay_log_name,rli->linfo.log_file_name,
sizeof(rli->group_relay_log_name)-1);
strmake(rli->event_relay_log_name,rli->linfo.log_file_name,
sizeof(rli->event_relay_log_name)-1);
if (rli->relay_log.is_active(rli->linfo.log_file_name))
{
/*
The IO thread is using this log file.
In this case, we will use the same IO_CACHE pointer to
read data as the IO thread is using to write data.
*/
my_b_seek((rli->cur_log=rli->relay_log.get_log_file()), (off_t)0);
if (check_binlog_magic(rli->cur_log,errmsg))
goto err;
rli->cur_log_old_open_count=rli->relay_log.get_open_count();
}
else
{
/*
Open the relay log and set rli->cur_log to point at this one
*/
if ((rli->cur_log_fd=open_binlog(&rli->cache_buf,
rli->linfo.log_file_name,errmsg)) < 0)
goto err;
rli->cur_log = &rli->cache_buf;
}
/*
In all cases, check_binlog_magic() has been called so we're at offset 4 for
sure.
*/
if (pos > BIN_LOG_HEADER_SIZE) /* If pos<=4, we stay at 4 */
{
Log_event* ev;
while (look_for_description_event)
{
/*
Read the possible Format_description_log_event; if position
was 4, no need, it will be read naturally.
*/
DBUG_PRINT("info",("looking for a Format_description_log_event"));
if (my_b_tell(rli->cur_log) >= pos)
break;
/*
Because of we have rli->data_lock and log_lock, we can safely read an
event
*/
if (!(ev=Log_event::read_log_event(rli->cur_log,0,
rli->relay_log.description_event_for_exec)))
{
DBUG_PRINT("info",("could not read event, rli->cur_log->error=%d",
rli->cur_log->error));
if (rli->cur_log->error) /* not EOF */
{
*errmsg= "I/O error reading event at position 4";
goto err;
}
break;
}
else if (ev->get_type_code() == FORMAT_DESCRIPTION_EVENT)
{
DBUG_PRINT("info",("found Format_description_log_event"));
delete rli->relay_log.description_event_for_exec;
rli->relay_log.description_event_for_exec= (Format_description_log_event*) ev;
/*
As ev was returned by read_log_event, it has passed is_valid(), so
my_malloc() in ctor worked, no need to check again.
*/
/*
Ok, we found a Format_description event. But it is not sure that this
describes the whole relay log; indeed, one can have this sequence
(starting from position 4):
Format_desc (of slave)
Rotate (of master)
Format_desc (of master)
So the Format_desc which really describes the rest of the relay log
is the 3rd event (it can't be further than that, because we rotate
the relay log when we queue a Rotate event from the master).
But what describes the Rotate is the first Format_desc.
So what we do is:
go on searching for Format_description events, until you exceed the
position (argument 'pos') or until you find another event than Rotate
or Format_desc.
*/
}
else
{
DBUG_PRINT("info",("found event of another type=%d",
ev->get_type_code()));
look_for_description_event= (ev->get_type_code() == ROTATE_EVENT);
delete ev;
}
}
my_b_seek(rli->cur_log,(off_t)pos);
#ifndef DBUG_OFF
{
char llbuf1[22], llbuf2[22];
DBUG_PRINT("info", ("my_b_tell(rli->cur_log)=%s rli->event_relay_log_pos=%s",
llstr(my_b_tell(rli->cur_log),llbuf1),
llstr(rli->event_relay_log_pos,llbuf2)));
}
#endif
}
err:
/*
If we don't purge, we can't honour relay_log_space_limit ;
silently discard it
*/
if (!relay_log_purge)
rli->log_space_limit= 0;
pthread_cond_broadcast(&rli->data_cond);
pthread_mutex_unlock(log_lock);
if (need_data_lock)
pthread_mutex_unlock(&rli->data_lock);
if (!rli->relay_log.description_event_for_exec->is_valid() && !*errmsg)
*errmsg= "Invalid Format_description log event; could be out of memory";
DBUG_RETURN ((*errmsg) ? 1 : 0);
}
/*
Init function to set up array for errors that should be skipped for slave
......@@ -461,174 +244,6 @@ void init_slave_skip_errors(const char* arg)
}
void st_relay_log_info::inc_group_relay_log_pos(ulonglong log_pos,
bool skip_lock)
{
DBUG_ENTER("st_relay_log_info::inc_group_relay_log_pos");
if (!skip_lock)
pthread_mutex_lock(&data_lock);
inc_event_relay_log_pos();
group_relay_log_pos= event_relay_log_pos;
strmake(group_relay_log_name,event_relay_log_name,
sizeof(group_relay_log_name)-1);
notify_group_relay_log_name_update();
/*
If the slave does not support transactions and replicates a transaction,
users should not trust group_master_log_pos (which they can display with
SHOW SLAVE STATUS or read from relay-log.info), because to compute
group_master_log_pos the slave relies on log_pos stored in the master's
binlog, but if we are in a master's transaction these positions are always
the BEGIN's one (excepted for the COMMIT), so group_master_log_pos does
not advance as it should on the non-transactional slave (it advances by
big leaps, whereas it should advance by small leaps).
*/
/*
In 4.x we used the event's len to compute the positions here. This is
wrong if the event was 3.23/4.0 and has been converted to 5.0, because
then the event's len is not what is was in the master's binlog, so this
will make a wrong group_master_log_pos (yes it's a bug in 3.23->4.0
replication: Exec_master_log_pos is wrong). Only way to solve this is to
have the original offset of the end of the event the relay log. This is
what we do in 5.0: log_pos has become "end_log_pos" (because the real use
of log_pos in 4.0 was to compute the end_log_pos; so better to store
end_log_pos instead of begin_log_pos.
If we had not done this fix here, the problem would also have appeared
when the slave and master are 5.0 but with different event length (for
example the slave is more recent than the master and features the event
UID). It would give false MASTER_POS_WAIT, false Exec_master_log_pos in
SHOW SLAVE STATUS, and so the user would do some CHANGE MASTER using this
value which would lead to badly broken replication.
Even the relay_log_pos will be corrupted in this case, because the len is
the relay log is not "val".
With the end_log_pos solution, we avoid computations involving lengthes.
*/
DBUG_PRINT("info", ("log_pos: %lu group_master_log_pos: %lu",
(long) log_pos, (long) group_master_log_pos));
if (log_pos) // 3.23 binlogs don't have log_posx
{
group_master_log_pos= log_pos;
}
pthread_cond_broadcast(&data_cond);
if (!skip_lock)
pthread_mutex_unlock(&data_lock);
DBUG_VOID_RETURN;
}
void st_relay_log_info::close_temporary_tables()
{
TABLE *table,*next;
DBUG_ENTER("st_relay_log_info::close_temporary_tables");
for (table=save_temporary_tables ; table ; table=next)
{
next=table->next;
/*
Don't ask for disk deletion. For now, anyway they will be deleted when
slave restarts, but it is a better intention to not delete them.
*/
DBUG_PRINT("info", ("table: %p", table));
close_temporary(table, 1, 0);
}
save_temporary_tables= 0;
slave_open_temp_tables= 0;
DBUG_VOID_RETURN;
}
/*
purge_relay_logs()
NOTES
Assumes to have a run lock on rli and that no slave thread are running.
*/
int purge_relay_logs(RELAY_LOG_INFO* rli, THD *thd, bool just_reset,
const char** errmsg)
{
int error=0;
DBUG_ENTER("purge_relay_logs");
/*
Even if rli->inited==0, we still try to empty rli->master_log_* variables.
Indeed, rli->inited==0 does not imply that they already are empty.
It could be that slave's info initialization partly succeeded :
for example if relay-log.info existed but *relay-bin*.*
have been manually removed, init_relay_log_info reads the old
relay-log.info and fills rli->master_log_*, then init_relay_log_info
checks for the existence of the relay log, this fails and
init_relay_log_info leaves rli->inited to 0.
In that pathological case, rli->master_log_pos* will be properly reinited
at the next START SLAVE (as RESET SLAVE or CHANGE
MASTER, the callers of purge_relay_logs, will delete bogus *.info files
or replace them with correct files), however if the user does SHOW SLAVE
STATUS before START SLAVE, he will see old, confusing rli->master_log_*.
In other words, we reinit rli->master_log_* for SHOW SLAVE STATUS
to display fine in any case.
*/
rli->group_master_log_name[0]= 0;
rli->group_master_log_pos= 0;
if (!rli->inited)
{
DBUG_PRINT("info", ("rli->inited == 0"));
DBUG_RETURN(0);
}
DBUG_ASSERT(rli->slave_running == 0);
DBUG_ASSERT(rli->mi->slave_running == 0);
rli->slave_skip_counter=0;
pthread_mutex_lock(&rli->data_lock);
/*
we close the relay log fd possibly left open by the slave SQL thread,
to be able to delete it; the relay log fd possibly left open by the slave
I/O thread will be closed naturally in reset_logs() by the
close(LOG_CLOSE_TO_BE_OPENED) call
*/
if (rli->cur_log_fd >= 0)
{
end_io_cache(&rli->cache_buf);
my_close(rli->cur_log_fd, MYF(MY_WME));
rli->cur_log_fd= -1;
}
if (rli->relay_log.reset_logs(thd))
{
*errmsg = "Failed during log reset";
error=1;
goto err;
}
/* Save name of used relay log file */
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(rli->event_relay_log_name)-1);
rli->group_relay_log_pos= rli->event_relay_log_pos= BIN_LOG_HEADER_SIZE;
if (count_relay_log_space(rli))
{
*errmsg= "Error counting relay log space";
goto err;
}
if (!just_reset)
error= init_relay_log_pos(rli, rli->group_relay_log_name,
rli->group_relay_log_pos,
0 /* do not need data lock */, errmsg, 0);
err:
#ifndef DBUG_OFF
char buf[22];
#endif
DBUG_PRINT("info",("log_space_total: %s",llstr(rli->log_space_total,buf)));
pthread_mutex_unlock(&rli->data_lock);
DBUG_RETURN(error);
}
int terminate_slave_threads(MASTER_INFO* mi,int thread_mask,bool skip_lock)
{
DBUG_ENTER("terminate_slave_threads");
......@@ -1023,7 +638,7 @@ const char *print_slave_db_safe(const char* db)
DBUG_RETURN((db ? db : ""));
}
static int init_strvar_from_file(char *var, int max_size, IO_CACHE *f,
int init_strvar_from_file(char *var, int max_size, IO_CACHE *f,
const char *default_val)
{
uint length;
......@@ -1054,7 +669,7 @@ static int init_strvar_from_file(char *var, int max_size, IO_CACHE *f,
}
static int init_intvar_from_file(int* var, IO_CACHE* f, int default_val)
int init_intvar_from_file(int* var, IO_CACHE* f, int default_val)
{
char buf[32];
DBUG_ENTER("init_intvar_from_file");
......@@ -1475,242 +1090,6 @@ void end_master_info(MASTER_INFO* mi)
}
static int init_relay_log_info(RELAY_LOG_INFO* rli,
const char* info_fname)
{
char fname[FN_REFLEN+128];
int info_fd;
const char* msg = 0;
int error = 0;
DBUG_ENTER("init_relay_log_info");
DBUG_ASSERT(!rli->no_storage); // Don't init if there is no storage
if (rli->inited) // Set if this function called
DBUG_RETURN(0);
fn_format(fname, info_fname, mysql_data_home, "", 4+32);
pthread_mutex_lock(&rli->data_lock);
info_fd = rli->info_fd;
rli->cur_log_fd = -1;
rli->slave_skip_counter=0;
rli->abort_pos_wait=0;
rli->log_space_limit= relay_log_space_limit;
rli->log_space_total= 0;
rli->tables_to_lock= 0;
rli->tables_to_lock_count= 0;
/*
The relay log will now be opened, as a SEQ_READ_APPEND IO_CACHE.
Note that the I/O thread flushes it to disk after writing every
event, in flush_master_info(mi, 1).
*/
/*
For the maximum log size, we choose max_relay_log_size if it is
non-zero, max_binlog_size otherwise. If later the user does SET
GLOBAL on one of these variables, fix_max_binlog_size and
fix_max_relay_log_size will reconsider the choice (for example
if the user changes max_relay_log_size to zero, we have to
switch to using max_binlog_size for the relay log) and update
rli->relay_log.max_size (and mysql_bin_log.max_size).
*/
{
char buf[FN_REFLEN];
const char *ln;
static bool name_warning_sent= 0;
ln= rli->relay_log.generate_name(opt_relay_logname, "-relay-bin",
1, buf);
/* We send the warning only at startup, not after every RESET SLAVE */
if (!opt_relay_logname && !opt_relaylog_index_name && !name_warning_sent)
{
/*
User didn't give us info to name the relay log index file.
Picking `hostname`-relay-bin.index like we do, causes replication to
fail if this slave's hostname is changed later. So, we would like to
instead require a name. But as we don't want to break many existing
setups, we only give warning, not error.
*/
sql_print_warning("Neither --relay-log nor --relay-log-index were used;"
" so replication "
"may break when this MySQL server acts as a "
"slave and has his hostname changed!! Please "
"use '--relay-log=%s' to avoid this problem.", ln);
name_warning_sent= 1;
}
/*
note, that if open() fails, we'll still have index file open
but a destructor will take care of that
*/
if (rli->relay_log.open_index_file(opt_relaylog_index_name, ln) ||
rli->relay_log.open(ln, LOG_BIN, 0, SEQ_READ_APPEND, 0,
(max_relay_log_size ? max_relay_log_size :
max_binlog_size), 1))
{
pthread_mutex_unlock(&rli->data_lock);
sql_print_error("Failed in open_log() called from init_relay_log_info()");
DBUG_RETURN(1);
}
}
/* if file does not exist */
if (access(fname,F_OK))
{
/*
If someone removed the file from underneath our feet, just close
the old descriptor and re-create the old file
*/
if (info_fd >= 0)
my_close(info_fd, MYF(MY_WME));
if ((info_fd = my_open(fname, O_CREAT|O_RDWR|O_BINARY, MYF(MY_WME))) < 0)
{
sql_print_error("Failed to create a new relay log info file (\
file '%s', errno %d)", fname, my_errno);
msg= current_thd->net.last_error;
goto err;
}
if (init_io_cache(&rli->info_file, info_fd, IO_SIZE*2, READ_CACHE, 0L,0,
MYF(MY_WME)))
{
sql_print_error("Failed to create a cache on relay log info file '%s'",
fname);
msg= current_thd->net.last_error;
goto err;
}
/* Init relay log with first entry in the relay index file */
if (init_relay_log_pos(rli,NullS,BIN_LOG_HEADER_SIZE,0 /* no data lock */,
&msg, 0))
{
sql_print_error("Failed to open the relay log 'FIRST' (relay_log_pos 4)");
goto err;
}
rli->group_master_log_name[0]= 0;
rli->group_master_log_pos= 0;
rli->info_fd= info_fd;
}
else // file exists
{
if (info_fd >= 0)
reinit_io_cache(&rli->info_file, READ_CACHE, 0L,0,0);
else
{
int error=0;
if ((info_fd = my_open(fname, O_RDWR|O_BINARY, MYF(MY_WME))) < 0)
{
sql_print_error("\
Failed to open the existing relay log info file '%s' (errno %d)",
fname, my_errno);
error= 1;
}
else if (init_io_cache(&rli->info_file, info_fd,
IO_SIZE*2, READ_CACHE, 0L, 0, MYF(MY_WME)))
{
sql_print_error("Failed to create a cache on relay log info file '%s'",
fname);
error= 1;
}
if (error)
{
if (info_fd >= 0)
my_close(info_fd, MYF(0));
rli->info_fd= -1;
rli->relay_log.close(LOG_CLOSE_INDEX | LOG_CLOSE_STOP_EVENT);
pthread_mutex_unlock(&rli->data_lock);
DBUG_RETURN(1);
}
}
rli->info_fd = info_fd;
int relay_log_pos, master_log_pos;
if (init_strvar_from_file(rli->group_relay_log_name,
sizeof(rli->group_relay_log_name),
&rli->info_file, "") ||
init_intvar_from_file(&relay_log_pos,
&rli->info_file, BIN_LOG_HEADER_SIZE) ||
init_strvar_from_file(rli->group_master_log_name,
sizeof(rli->group_master_log_name),
&rli->info_file, "") ||
init_intvar_from_file(&master_log_pos, &rli->info_file, 0))
{
msg="Error reading slave log configuration";
goto err;
}
strmake(rli->event_relay_log_name,rli->group_relay_log_name,
sizeof(rli->event_relay_log_name)-1);
rli->group_relay_log_pos= rli->event_relay_log_pos= relay_log_pos;
rli->group_master_log_pos= master_log_pos;
if (init_relay_log_pos(rli,
rli->group_relay_log_name,
rli->group_relay_log_pos,
0 /* no data lock*/,
&msg, 0))
{
char llbuf[22];
sql_print_error("Failed to open the relay log '%s' (relay_log_pos %s)",
rli->group_relay_log_name,
llstr(rli->group_relay_log_pos, llbuf));
goto err;
}
}
#ifndef DBUG_OFF
{
char llbuf1[22], llbuf2[22];
DBUG_PRINT("info", ("my_b_tell(rli->cur_log)=%s rli->event_relay_log_pos=%s",
llstr(my_b_tell(rli->cur_log),llbuf1),
llstr(rli->event_relay_log_pos,llbuf2)));
DBUG_ASSERT(rli->event_relay_log_pos >= BIN_LOG_HEADER_SIZE);
DBUG_ASSERT(my_b_tell(rli->cur_log) == rli->event_relay_log_pos);
}
#endif
/*
Now change the cache from READ to WRITE - must do this
before flush_relay_log_info
*/
reinit_io_cache(&rli->info_file, WRITE_CACHE,0L,0,1);
if ((error= flush_relay_log_info(rli)))
sql_print_error("Failed to flush relay log info file");
if (count_relay_log_space(rli))
{
msg="Error counting relay log space";
goto err;
}
rli->inited= 1;
pthread_mutex_unlock(&rli->data_lock);
DBUG_RETURN(error);
err:
sql_print_error(msg);
end_io_cache(&rli->info_file);
if (info_fd >= 0)
my_close(info_fd, MYF(0));
rli->info_fd= -1;
rli->relay_log.close(LOG_CLOSE_INDEX | LOG_CLOSE_STOP_EVENT);
pthread_mutex_unlock(&rli->data_lock);
DBUG_RETURN(1);
}
static inline int add_relay_log(RELAY_LOG_INFO* rli,LOG_INFO* linfo)
{
MY_STAT s;
DBUG_ENTER("add_relay_log");
if (!my_stat(linfo->log_file_name,&s,MYF(0)))
{
sql_print_error("log %s listed in the index, but failed to stat",
linfo->log_file_name);
DBUG_RETURN(1);
}
rli->log_space_total += s.st_size;
#ifndef DBUG_OFF
char buf[22];
DBUG_PRINT("info",("log_space_total: %s", llstr(rli->log_space_total,buf)));
#endif
DBUG_RETURN(0);
}
static bool wait_for_relay_log_space(RELAY_LOG_INFO* rli)
{
bool slave_killed=0;
......@@ -1733,31 +1112,6 @@ Waiting for the slave SQL thread to free enough relay log space");
}
static int count_relay_log_space(RELAY_LOG_INFO* rli)
{
LOG_INFO linfo;
DBUG_ENTER("count_relay_log_space");
rli->log_space_total= 0;
if (rli->relay_log.find_log_pos(&linfo, NullS, 1))
{
sql_print_error("Could not find first log while counting relay log space");
DBUG_RETURN(1);
}
do
{
if (add_relay_log(rli,&linfo))
DBUG_RETURN(1);
} while (!rli->relay_log.find_next_log(&linfo, 1));
/*
As we have counted everything, including what may have written in a
preceding write, we must reset bytes_written, or we may count some space
twice.
*/
rli->relay_log.reset_bytes_written();
DBUG_RETURN(0);
}
/*
Builds a Rotate from the ignored events' info and writes it to relay log.
......@@ -1841,32 +1195,6 @@ void init_master_info_with_options(MASTER_INFO* mi)
DBUG_VOID_RETURN;
}
void clear_slave_error(RELAY_LOG_INFO* rli)
{
DBUG_ENTER("clear_slave_error");
/* Clear the errors displayed by SHOW SLAVE STATUS */
rli->last_slave_error[0]= 0;
rli->last_slave_errno= 0;
DBUG_VOID_RETURN;
}
/*
Reset UNTIL condition for RELAY_LOG_INFO
SYNOPSYS
clear_until_condition()
rli - RELAY_LOG_INFO structure where UNTIL condition should be reset
*/
void clear_until_condition(RELAY_LOG_INFO* rli)
{
DBUG_ENTER("clear_until_condition");
rli->until_condition= RELAY_LOG_INFO::UNTIL_NONE;
rli->until_log_name[0]= 0;
rli->until_log_pos= 0;
DBUG_VOID_RETURN;
}
#define LINES_IN_MASTER_INFO_WITH_SSL 14
......@@ -2365,256 +1693,6 @@ int flush_master_info(MASTER_INFO* mi, bool flush_relay_log_cache)
}
st_relay_log_info::st_relay_log_info()
:no_storage(FALSE), info_fd(-1), cur_log_fd(-1), save_temporary_tables(0),
cur_log_old_open_count(0), group_master_log_pos(0), log_space_total(0),
ignore_log_space_limit(0), last_master_timestamp(0), slave_skip_counter(0),
abort_pos_wait(0), slave_run_id(0), sql_thd(0), last_slave_errno(0),
inited(0), abort_slave(0), slave_running(0), until_condition(UNTIL_NONE),
until_log_pos(0), retried_trans(0),
tables_to_lock(0), tables_to_lock_count(0),
m_reload_flags(RELOAD_NONE_F),
unsafe_to_stop_at(0)
{
DBUG_ENTER("st_relay_log_info::st_relay_log_info");
group_relay_log_name[0]= event_relay_log_name[0]=
group_master_log_name[0]= 0;
last_slave_error[0]= until_log_name[0]= ign_master_log_name_end[0]= 0;
bzero((char*) &info_file, sizeof(info_file));
bzero((char*) &cache_buf, sizeof(cache_buf));
cached_charset_invalidate();
pthread_mutex_init(&run_lock, MY_MUTEX_INIT_FAST);
pthread_mutex_init(&data_lock, MY_MUTEX_INIT_FAST);
pthread_mutex_init(&log_space_lock, MY_MUTEX_INIT_FAST);
pthread_cond_init(&data_cond, NULL);
pthread_cond_init(&start_cond, NULL);
pthread_cond_init(&stop_cond, NULL);
pthread_cond_init(&log_space_cond, NULL);
relay_log.init_pthread_objects();
DBUG_VOID_RETURN;
}
st_relay_log_info::~st_relay_log_info()
{
DBUG_ENTER("st_relay_log_info::~st_relay_log_info");
pthread_mutex_destroy(&run_lock);
pthread_mutex_destroy(&data_lock);
pthread_mutex_destroy(&log_space_lock);
pthread_cond_destroy(&data_cond);
pthread_cond_destroy(&start_cond);
pthread_cond_destroy(&stop_cond);
pthread_cond_destroy(&log_space_cond);
relay_log.cleanup();
DBUG_VOID_RETURN;
}
/*
Waits until the SQL thread reaches (has executed up to) the
log/position or timed out.
SYNOPSIS
wait_for_pos()
thd client thread that sent SELECT MASTER_POS_WAIT
log_name log name to wait for
log_pos position to wait for
timeout timeout in seconds before giving up waiting
NOTES
timeout is longlong whereas it should be ulong ; but this is
to catch if the user submitted a negative timeout.
RETURN VALUES
-2 improper arguments (log_pos<0)
or slave not running, or master info changed
during the function's execution,
or client thread killed. -2 is translated to NULL by caller
-1 timed out
>=0 number of log events the function had to wait
before reaching the desired log/position
*/
int st_relay_log_info::wait_for_pos(THD* thd, String* log_name,
longlong log_pos,
longlong timeout)
{
int event_count = 0;
ulong init_abort_pos_wait;
int error=0;
struct timespec abstime; // for timeout checking
const char *msg;
DBUG_ENTER("st_relay_log_info::wait_for_pos");
if (!inited)
DBUG_RETURN(-1);
DBUG_PRINT("enter",("log_name: '%s' log_pos: %lu timeout: %lu",
log_name->c_ptr(), (ulong) log_pos, (ulong) timeout));
set_timespec(abstime,timeout);
pthread_mutex_lock(&data_lock);
msg= thd->enter_cond(&data_cond, &data_lock,
"Waiting for the slave SQL thread to "
"advance position");
/*
This function will abort when it notices that some CHANGE MASTER or
RESET MASTER has changed the master info.
To catch this, these commands modify abort_pos_wait ; We just monitor
abort_pos_wait and see if it has changed.
Why do we have this mechanism instead of simply monitoring slave_running
in the loop (we do this too), as CHANGE MASTER/RESET SLAVE require that
the SQL thread be stopped?
This is becasue if someones does:
STOP SLAVE;CHANGE MASTER/RESET SLAVE; START SLAVE;
the change may happen very quickly and we may not notice that
slave_running briefly switches between 1/0/1.
*/
init_abort_pos_wait= abort_pos_wait;
/*
We'll need to
handle all possible log names comparisons (e.g. 999 vs 1000).
We use ulong for string->number conversion ; this is no
stronger limitation than in find_uniq_filename in sql/log.cc
*/
ulong log_name_extension;
char log_name_tmp[FN_REFLEN]; //make a char[] from String
strmake(log_name_tmp, log_name->ptr(), min(log_name->length(), FN_REFLEN-1));
char *p= fn_ext(log_name_tmp);
char *p_end;
if (!*p || log_pos<0)
{
error= -2; //means improper arguments
goto err;
}
// Convert 0-3 to 4
log_pos= max(log_pos, BIN_LOG_HEADER_SIZE);
/* p points to '.' */
log_name_extension= strtoul(++p, &p_end, 10);
/*
p_end points to the first invalid character.
If it equals to p, no digits were found, error.
If it contains '\0' it means conversion went ok.
*/
if (p_end==p || *p_end)
{
error= -2;
goto err;
}
/* The "compare and wait" main loop */
while (!thd->killed &&
init_abort_pos_wait == abort_pos_wait &&
slave_running)
{
bool pos_reached;
int cmp_result= 0;
DBUG_PRINT("info",
("init_abort_pos_wait: %ld abort_pos_wait: %ld",
init_abort_pos_wait, abort_pos_wait));
DBUG_PRINT("info",("group_master_log_name: '%s' pos: %lu",
group_master_log_name, (ulong) group_master_log_pos));
/*
group_master_log_name can be "", if we are just after a fresh
replication start or after a CHANGE MASTER TO MASTER_HOST/PORT
(before we have executed one Rotate event from the master) or
(rare) if the user is doing a weird slave setup (see next
paragraph). If group_master_log_name is "", we assume we don't
have enough info to do the comparison yet, so we just wait until
more data. In this case master_log_pos is always 0 except if
somebody (wrongly) sets this slave to be a slave of itself
without using --replicate-same-server-id (an unsupported
configuration which does nothing), then group_master_log_pos
will grow and group_master_log_name will stay "".
*/
if (*group_master_log_name)
{
char *basename= (group_master_log_name +
dirname_length(group_master_log_name));
/*
First compare the parts before the extension.
Find the dot in the master's log basename,
and protect against user's input error :
if the names do not match up to '.' included, return error
*/
char *q= (char*)(fn_ext(basename)+1);
if (strncmp(basename, log_name_tmp, (int)(q-basename)))
{
error= -2;
break;
}
// Now compare extensions.
char *q_end;
ulong group_master_log_name_extension= strtoul(q, &q_end, 10);
if (group_master_log_name_extension < log_name_extension)
cmp_result= -1 ;
else
cmp_result= (group_master_log_name_extension > log_name_extension) ? 1 : 0 ;
pos_reached= ((!cmp_result && group_master_log_pos >= (ulonglong)log_pos) ||
cmp_result > 0);
if (pos_reached || thd->killed)
break;
}
//wait for master update, with optional timeout.
DBUG_PRINT("info",("Waiting for master update"));
/*
We are going to pthread_cond_(timed)wait(); if the SQL thread stops it
will wake us up.
*/
if (timeout > 0)
{
/*
Note that pthread_cond_timedwait checks for the timeout
before for the condition ; i.e. it returns ETIMEDOUT
if the system time equals or exceeds the time specified by abstime
before the condition variable is signaled or broadcast, _or_ if
the absolute time specified by abstime has already passed at the time
of the call.
For that reason, pthread_cond_timedwait will do the "timeoutting" job
even if its condition is always immediately signaled (case of a loaded
master).
*/
error=pthread_cond_timedwait(&data_cond, &data_lock, &abstime);
}
else
pthread_cond_wait(&data_cond, &data_lock);
DBUG_PRINT("info",("Got signal of master update or timed out"));
if (error == ETIMEDOUT || error == ETIME)
{
error= -1;
break;
}
error=0;
event_count++;
DBUG_PRINT("info",("Testing if killed or SQL thread not running"));
}
err:
thd->exit_cond(msg);
DBUG_PRINT("exit",("killed: %d abort: %d slave_running: %d \
improper_arguments: %d timed_out: %d",
thd->killed_errno(),
(int) (init_abort_pos_wait != abort_pos_wait),
(int) slave_running,
(int) (error == -2),
(int) (error == -1)));
if (thd->killed || init_abort_pos_wait != abort_pos_wait ||
!slave_running)
{
error= -2;
}
DBUG_RETURN( error ? error : event_count );
}
void set_slave_thread_options(THD* thd)
{
DBUG_ENTER("set_slave_thread_options");
......@@ -2871,119 +1949,6 @@ int check_expected_error(THD* thd, RELAY_LOG_INFO* rli, int expected_error)
}
}
/*
Check if condition stated in UNTIL clause of START SLAVE is reached.
SYNOPSYS
st_relay_log_info::is_until_satisfied()
DESCRIPTION
Checks if UNTIL condition is reached. Uses caching result of last
comparison of current log file name and target log file name. So cached
value should be invalidated if current log file name changes
(see st_relay_log_info::notify_... functions).
This caching is needed to avoid of expensive string comparisons and
strtol() conversions needed for log names comparison. We don't need to
compare them each time this function is called, we only need to do this
when current log name changes. If we have UNTIL_MASTER_POS condition we
need to do this only after Rotate_log_event::exec_event() (which is
rare, so caching gives real benifit), and if we have UNTIL_RELAY_POS
condition then we should invalidate cached comarison value after
inc_group_relay_log_pos() which called for each group of events (so we
have some benefit if we have something like queries that use
autoincrement or if we have transactions).
Should be called ONLY if until_condition != UNTIL_NONE !
RETURN VALUE
true - condition met or error happened (condition seems to have
bad log file name)
false - condition not met
*/
bool st_relay_log_info::is_until_satisfied()
{
const char *log_name;
ulonglong log_pos;
DBUG_ENTER("st_relay_log_info::is_until_satisfied");
DBUG_ASSERT(until_condition != UNTIL_NONE);
if (until_condition == UNTIL_MASTER_POS)
{
log_name= group_master_log_name;
log_pos= group_master_log_pos;
}
else
{ /* until_condition == UNTIL_RELAY_POS */
log_name= group_relay_log_name;
log_pos= group_relay_log_pos;
}
if (until_log_names_cmp_result == UNTIL_LOG_NAMES_CMP_UNKNOWN)
{
/*
We have no cached comparison results so we should compare log names
and cache result.
If we are after RESET SLAVE, and the SQL slave thread has not processed
any event yet, it could be that group_master_log_name is "". In that case,
just wait for more events (as there is no sensible comparison to do).
*/
if (*log_name)
{
const char *basename= log_name + dirname_length(log_name);
const char *q= (const char*)(fn_ext(basename)+1);
if (strncmp(basename, until_log_name, (int)(q-basename)) == 0)
{
/* Now compare extensions. */
char *q_end;
ulong log_name_extension= strtoul(q, &q_end, 10);
if (log_name_extension < until_log_name_extension)
until_log_names_cmp_result= UNTIL_LOG_NAMES_CMP_LESS;
else
until_log_names_cmp_result=
(log_name_extension > until_log_name_extension) ?
UNTIL_LOG_NAMES_CMP_GREATER : UNTIL_LOG_NAMES_CMP_EQUAL ;
}
else
{
/* Probably error so we aborting */
sql_print_error("Slave SQL thread is stopped because UNTIL "
"condition is bad.");
DBUG_RETURN(TRUE);
}
}
else
DBUG_RETURN(until_log_pos == 0);
}
DBUG_RETURN(((until_log_names_cmp_result == UNTIL_LOG_NAMES_CMP_EQUAL &&
log_pos >= until_log_pos) ||
until_log_names_cmp_result == UNTIL_LOG_NAMES_CMP_GREATER));
}
void st_relay_log_info::cached_charset_invalidate()
{
DBUG_ENTER("st_relay_log_info::cached_charset_invalidate");
/* Full of zeroes means uninitialized. */
bzero(cached_charset, sizeof(cached_charset));
DBUG_VOID_RETURN;
}
bool st_relay_log_info::cached_charset_compare(char *charset)
{
DBUG_ENTER("st_relay_log_info::cached_charset_compare");
if (bcmp(cached_charset, charset, sizeof(cached_charset)))
{
memcpy(cached_charset, charset, sizeof(cached_charset));
DBUG_RETURN(1);
}
DBUG_RETURN(0);
}
/*
Check if the current error is of temporary nature of not.
......@@ -3633,7 +2598,7 @@ pthread_handler_t handle_slave_sql(void *arg)
now.
But the master timestamp is reset by RESET SLAVE & CHANGE MASTER.
*/
clear_slave_error(rli);
rli->clear_slave_error();
//tell the I/O thread to take relay_log_space_limit into account from now on
pthread_mutex_lock(&rli->log_space_lock);
......@@ -4991,121 +3956,6 @@ end:
DBUG_VOID_RETURN;
}
/*
Some system tables needed to be re-read by the MySQL server after it has
updated them; in statement-based replication, the GRANT and other commands
are sent verbatim to the slave which then reloads; in row-based replication,
changes to these tables are done through ordinary Rows binlog events, so
master must add some flag for the slave to know it has to reload the tables.
*/
struct st_reload_entry
{
char const *table;
st_relay_log_info::enum_reload_flag flag;
};
/*
Sorted array of table names, please keep it sorted since we are
using bsearch() on it below.
*/
static st_reload_entry s_mysql_tables[] =
{
{ "columns_priv", st_relay_log_info::RELOAD_GRANT_F },
{ "db", st_relay_log_info::RELOAD_ACCESS_F },
{ "host", st_relay_log_info::RELOAD_ACCESS_F },
{ "procs_priv", st_relay_log_info::RELOAD_GRANT_F },
{ "tables_priv", st_relay_log_info::RELOAD_GRANT_F },
{ "user", st_relay_log_info::RELOAD_ACCESS_F }
};
static const my_size_t s_mysql_tables_size =
sizeof(s_mysql_tables)/sizeof(*s_mysql_tables);
static int reload_entry_compare(const void *lhs, const void *rhs)
{
const char *lstr = static_cast<const char *>(lhs);
const char *rstr = static_cast<const st_reload_entry*>(rhs)->table;
DBUG_ENTER("reload_entry_compare");
DBUG_RETURN(strcmp(lstr, rstr));
}
void st_relay_log_info::touching_table(char const* db, char const* table,
ulong table_id)
{
DBUG_ENTER("st_relay_log_info::touching_table");
if (strcmp(db,"mysql") == 0)
{
#if defined(HAVE_BSEARCH) && defined(HAVE_SIZE_T)
void *const ptr= bsearch(table, s_mysql_tables,
s_mysql_tables_size,
sizeof(*s_mysql_tables), reload_entry_compare);
st_reload_entry const *const entry= static_cast<st_reload_entry*>(ptr);
#else
/*
Fall back to full scan, there are few rows anyway and updating the
"mysql" database is rare.
*/
st_reload_entry const *entry= s_mysql_tables;
for ( ; entry < s_mysql_tables + s_mysql_tables_size ; entry++)
if (reload_entry_compare(table, entry) == 0)
break;
#endif
if (entry)
m_reload_flags|= entry->flag;
}
DBUG_VOID_RETURN;
}
void st_relay_log_info::transaction_end(THD* thd)
{
DBUG_ENTER("st_relay_log_info::transaction_end");
if (m_reload_flags != RELOAD_NONE_F)
{
if (m_reload_flags & RELOAD_ACCESS_F)
acl_reload(thd);
if (m_reload_flags & RELOAD_GRANT_F)
grant_reload(thd);
m_reload_flags= RELOAD_NONE_F;
}
DBUG_VOID_RETURN;
}
#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
void st_relay_log_info::cleanup_context(THD *thd, bool error)
{
DBUG_ENTER("st_relay_log_info::cleanup_context");
DBUG_ASSERT(sql_thd == thd);
/*
1) Instances of Table_map_log_event, if ::exec_event() was called on them,
may have opened tables, which we cannot be sure have been closed (because
maybe the Rows_log_event have not been found or will not be, because slave
SQL thread is stopping, or relay log has a missing tail etc). So we close
all thread's tables. And so the table mappings have to be cancelled.
2) Rows_log_event::exec_event() may even have started statements or
transactions on them, which we need to rollback in case of error.
3) If finding a Format_description_log_event after a BEGIN, we also need
to rollback before continuing with the next events.
4) so we need this "context cleanup" function.
*/
if (error)
{
ha_autocommit_or_rollback(thd, 1); // if a "statement transaction"
end_trans(thd, ROLLBACK); // if a "real transaction"
}
m_table_map.clear_tables();
close_thread_tables(thd);
clear_tables_to_lock();
unsafe_to_stop_at= 0;
DBUG_VOID_RETURN;
}
#endif
#ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
template class I_List_iterator<i_string>;
......
sql/sql_repl.cc
View file @ 69d92fb1
......@@ -805,7 +805,7 @@ int start_slave(THD* thd , MASTER_INFO* mi, bool net_report)
sizeof(mi->rli.until_log_name)-1);
}
else
clear_until_condition(&mi->rli);
mi->rli.clear_until_condition();
if (mi->rli.until_condition != RELAY_LOG_INFO::UNTIL_NONE)
{
......@@ -978,8 +978,8 @@ int reset_slave(THD *thd, MASTER_INFO* mi)
Reset errors (the idea is that we forget about the
old master).
*/
clear_slave_error(&mi->rli);
clear_until_condition(&mi->rli);
mi->rli.clear_slave_error();
mi->rli.clear_until_condition();
// close master_info_file, relay_log_info_file, set mi->inited=rli->inited=0
end_master_info(mi);
......@@ -1244,8 +1244,8 @@ bool change_master(THD* thd, MASTER_INFO* mi)
pthread_mutex_lock(&mi->rli.data_lock);
mi->rli.abort_pos_wait++; /* for MASTER_POS_WAIT() to abort */
/* Clear the errors, for a clean start */
clear_slave_error(&mi->rli);
clear_until_condition(&mi->rli);
mi->rli.clear_slave_error();
mi->rli.clear_until_condition();
/*
If we don't write new coordinates to disk now, then old will remain in
relay-log.info until START SLAVE is issued; but if mysqld is shutdown
......
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