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mariadb/sql/sql_repl.cc
unknown f198cb35b7 code clean-up 
sql/sql_repl.cc:
  code clean-up: we can use thd here.
2004-09-14 18:57:22 +05:00

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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB & Sasha
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 */
// Sasha Pachev <sasha@mysql.com> is currently in charge of this file
#include "mysql_priv.h"
#ifdef HAVE_REPLICATION
#include "sql_repl.h"
#include "sql_acl.h"
#include "log_event.h"
#include <my_dir.h>
int max_binlog_dump_events = 0; // unlimited
my_bool opt_sporadic_binlog_dump_fail = 0;
static int binlog_dump_count = 0;
int check_binlog_magic(IO_CACHE* log, const char** errmsg)
{
char magic[4];
DBUG_ASSERT(my_b_tell(log) == 0);
if (my_b_read(log, (byte*) magic, sizeof(magic)))
{
*errmsg = "I/O error reading the header from the binary log";
sql_print_error("%s, errno=%d, io cache code=%d", *errmsg, my_errno,
log->error);
return 1;
}
if (memcmp(magic, BINLOG_MAGIC, sizeof(magic)))
{
*errmsg = "Binlog has bad magic number; It's not a binary log file that can be used by this version of MySQL";
return 1;
}
return 0;
}
static int fake_rotate_event(NET* net, String* packet, char* log_file_name,
ulonglong position, const char**errmsg)
{
char header[LOG_EVENT_HEADER_LEN], buf[ROTATE_HEADER_LEN];
memset(header, 0, 4); // when does not matter
header[EVENT_TYPE_OFFSET] = ROTATE_EVENT;
char* p = log_file_name+dirname_length(log_file_name);
uint ident_len = (uint) strlen(p);
ulong event_len = ident_len + ROTATE_EVENT_OVERHEAD;
int4store(header + SERVER_ID_OFFSET, server_id);
int4store(header + EVENT_LEN_OFFSET, event_len);
int2store(header + FLAGS_OFFSET, 0);
// TODO: check what problems this may cause and fix them
int4store(header + LOG_POS_OFFSET, 0);
packet->append(header, sizeof(header));
int8store(buf+R_POS_OFFSET,position);
packet->append(buf, ROTATE_HEADER_LEN);
packet->append(p,ident_len);
if (my_net_write(net, (char*)packet->ptr(), packet->length()))
{
*errmsg = "failed on my_net_write()";
return -1;
}
return 0;
}
static int send_file(THD *thd)
{
NET* net = &thd->net;
int fd = -1,bytes, error = 1;
char fname[FN_REFLEN+1];
const char *errmsg = 0;
int old_timeout;
uint packet_len;
char buf[IO_SIZE]; // It's safe to alloc this
DBUG_ENTER("send_file");
/*
The client might be slow loading the data, give him wait_timeout to do
the job
*/
old_timeout = thd->net.read_timeout;
thd->net.read_timeout = thd->variables.net_wait_timeout;
/*
We need net_flush here because the client will not know it needs to send
us the file name until it has processed the load event entry
*/
if (net_flush(net) || (packet_len = my_net_read(net)) == packet_error)
{
errmsg = "while reading file name";
goto err;
}
// terminate with \0 for fn_format
*((char*)net->read_pos + packet_len) = 0;
fn_format(fname, (char*) net->read_pos + 1, "", "", 4);
// this is needed to make replicate-ignore-db
if (!strcmp(fname,"/dev/null"))
goto end;
if ((fd = my_open(fname, O_RDONLY, MYF(0))) < 0)
{
errmsg = "on open of file";
goto err;
}
while ((bytes = (int) my_read(fd, (byte*) buf, IO_SIZE, MYF(0))) > 0)
{
if (my_net_write(net, buf, bytes))
{
errmsg = "while writing data to client";
goto err;
}
}
end:
if (my_net_write(net, "", 0) || net_flush(net) ||
(my_net_read(net) == packet_error))
{
errmsg = "while negotiating file transfer close";
goto err;
}
error = 0;
err:
thd->net.read_timeout = old_timeout;
if (fd >= 0)
(void) my_close(fd, MYF(0));
if (errmsg)
{
sql_print_error("Failed in send_file() %s", errmsg);
DBUG_PRINT("error", (errmsg));
}
DBUG_RETURN(error);
}
File open_binlog(IO_CACHE *log, const char *log_file_name,
const char **errmsg)
{
File file;
DBUG_ENTER("open_binlog");
if ((file = my_open(log_file_name, O_RDONLY | O_BINARY, MYF(MY_WME))) < 0)
{
sql_print_error("Failed to open log (\
file '%s', errno %d)", log_file_name, my_errno);
*errmsg = "Could not open log file"; // This will not be sent
goto err;
}
if (init_io_cache(log, file, IO_SIZE*2, READ_CACHE, 0, 0,
MYF(MY_WME | MY_DONT_CHECK_FILESIZE)))
{
sql_print_error("Failed to create a cache on log (\
file '%s')", log_file_name);
*errmsg = "Could not open log file"; // This will not be sent
goto err;
}
if (check_binlog_magic(log,errmsg))
goto err;
DBUG_RETURN(file);
err:
if (file >= 0)
{
my_close(file,MYF(0));
end_io_cache(log);
}
DBUG_RETURN(-1);
}
/*
Adjust the position pointer in the binary log file for all running slaves
SYNOPSIS
adjust_linfo_offsets()
purge_offset Number of bytes removed from start of log index file
NOTES
- This is called when doing a PURGE when we delete lines from the
index log file
REQUIREMENTS
- Before calling this function, we have to ensure that no threads are
using any binary log file before purge_offset.a
TODO
- Inform the slave threads that they should sync the position
in the binary log file with flush_relay_log_info.
Now they sync is done for next read.
*/
void adjust_linfo_offsets(my_off_t purge_offset)
{
THD *tmp;
pthread_mutex_lock(&LOCK_thread_count);
I_List_iterator<THD> it(threads);
while ((tmp=it++))
{
LOG_INFO* linfo;
if ((linfo = tmp->current_linfo))
{
pthread_mutex_lock(&linfo->lock);
/*
Index file offset can be less that purge offset only if
we just started reading the index file. In that case
we have nothing to adjust
*/
if (linfo->index_file_offset < purge_offset)
linfo->fatal = (linfo->index_file_offset != 0);
else
linfo->index_file_offset -= purge_offset;
pthread_mutex_unlock(&linfo->lock);
}
}
pthread_mutex_unlock(&LOCK_thread_count);
}
bool log_in_use(const char* log_name)
{
int log_name_len = strlen(log_name) + 1;
THD *tmp;
bool result = 0;
pthread_mutex_lock(&LOCK_thread_count);
I_List_iterator<THD> it(threads);
while ((tmp=it++))
{
LOG_INFO* linfo;
if ((linfo = tmp->current_linfo))
{
pthread_mutex_lock(&linfo->lock);
result = !memcmp(log_name, linfo->log_file_name, log_name_len);
pthread_mutex_unlock(&linfo->lock);
if (result)
break;
}
}
pthread_mutex_unlock(&LOCK_thread_count);
return result;
}
int purge_error_message(THD* thd, int res)
{
const char *errmsg= 0;
switch (res) {
case 0: break;
case LOG_INFO_EOF: errmsg= "Target log not found in binlog index"; break;
case LOG_INFO_IO: errmsg= "I/O error reading log index file"; break;
case LOG_INFO_INVALID:
errmsg= "Server configuration does not permit binlog purge"; break;
case LOG_INFO_SEEK: errmsg= "Failed on fseek()"; break;
case LOG_INFO_MEM: errmsg= "Out of memory"; break;
case LOG_INFO_FATAL: errmsg= "Fatal error during purge"; break;
case LOG_INFO_IN_USE: errmsg= "A purgeable log is in use, will not purge";
break;
default: errmsg= "Unknown error during purge"; break;
}
if (errmsg)
{
send_error(thd, 0, errmsg);
return 1;
}
send_ok(thd);
return 0;
}
int purge_master_logs(THD* thd, const char* to_log)
{
char search_file_name[FN_REFLEN];
if (!mysql_bin_log.is_open())
{
send_ok(thd);
return 0;
}
mysql_bin_log.make_log_name(search_file_name, to_log);
return purge_error_message(thd,
mysql_bin_log.purge_logs(search_file_name, 0, 1,
1, NULL));
}
int purge_master_logs_before_date(THD* thd, time_t purge_time)
{
if (!mysql_bin_log.is_open())
{
send_ok(thd);
return 0;
}
return purge_error_message(thd,
mysql_bin_log.purge_logs_before_date(purge_time));
}
/*
TODO: Clean up loop to only have one call to send_file()
*/
void mysql_binlog_send(THD* thd, char* log_ident, my_off_t pos,
ushort flags)
{
LOG_INFO linfo;
char *log_file_name = linfo.log_file_name;
char search_file_name[FN_REFLEN], *name;
IO_CACHE log;
File file = -1;
String* packet = &thd->packet;
int error;
const char *errmsg = "Unknown error";
NET* net = &thd->net;
#ifndef DBUG_OFF
int left_events = max_binlog_dump_events;
#endif
DBUG_ENTER("mysql_binlog_send");
DBUG_PRINT("enter",("log_ident: '%s' pos: %ld", log_ident, (long) pos));
bzero((char*) &log,sizeof(log));
#ifndef DBUG_OFF
if (opt_sporadic_binlog_dump_fail && (binlog_dump_count++ % 2))
{
errmsg = "Master failed COM_BINLOG_DUMP to test if slave can recover";
my_errno= ER_UNKNOWN_ERROR;
goto err;
}
#endif
if (!mysql_bin_log.is_open())
{
errmsg = "Binary log is not open";
my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
goto err;
}
if (!server_id_supplied)
{
errmsg = "Misconfigured master - server id was not set";
my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
goto err;
}
name=search_file_name;
if (log_ident[0])
mysql_bin_log.make_log_name(search_file_name, log_ident);
else
name=0; // Find first log
linfo.index_file_offset = 0;
thd->current_linfo = &linfo;
if (mysql_bin_log.find_log_pos(&linfo, name, 1))
{
errmsg = "Could not find first log file name in binary log index file";
my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
goto err;
}
if ((file=open_binlog(&log, log_file_name, &errmsg)) < 0)
{
my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
goto err;
}
if (pos < BIN_LOG_HEADER_SIZE || pos > my_b_filelength(&log))
{
errmsg= "Client requested master to start replication from \
impossible position";
my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
goto err;
}
my_b_seek(&log, pos); // Seek will done on next read
/*
We need to start a packet with something other than 255
to distiquish it from error
*/
packet->set("\0", 1, &my_charset_bin);
/*
Before 4.0.14 we called fake_rotate_event below only if
(pos == BIN_LOG_HEADER_SIZE), because if this is false then the slave
already knows the binlog's name.
Now we always call fake_rotate_event; if the slave already knew the log's
name (ex: CHANGE MASTER TO MASTER_LOG_FILE=...) this is useless but does
not harm much. It is nice for 3.23 (>=.58) slaves which test Rotate events
to see if the master is 4.0 (then they choose to stop because they can't
replicate 4.0); by always calling fake_rotate_event we are sure that
3.23.58 and newer will detect the problem as soon as replication starts
(BUG#198).
Always calling fake_rotate_event makes sending of normal
(=from-binlog) Rotate events a priori unneeded, but it is not so simple:
the 2 Rotate events are not equivalent, the normal one is before the Stop
event, the fake one is after. If we don't send the normal one, then the
Stop event will be interpreted (by existing 4.0 slaves) as "the master
stopped", which is wrong. So for safety, given that we want minimum
modification of 4.0, we send the normal and fake Rotates.
*/
if (fake_rotate_event(net, packet, log_file_name, pos, &errmsg))
{
my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
goto err;
}
packet->set("\0", 1, &my_charset_bin);
while (!net->error && net->vio != 0 && !thd->killed)
{
pthread_mutex_t *log_lock = mysql_bin_log.get_log_lock();
while (!(error = Log_event::read_log_event(&log, packet, log_lock)))
{
#ifndef DBUG_OFF
if (max_binlog_dump_events && !left_events--)
{
net_flush(net);
errmsg = "Debugging binlog dump abort";
my_errno= ER_UNKNOWN_ERROR;
goto err;
}
#endif
if (my_net_write(net, (char*)packet->ptr(), packet->length()) )
{
errmsg = "Failed on my_net_write()";
my_errno= ER_UNKNOWN_ERROR;
goto err;
}
DBUG_PRINT("info", ("log event code %d",
(*packet)[LOG_EVENT_OFFSET+1] ));
if ((*packet)[LOG_EVENT_OFFSET+1] == LOAD_EVENT)
{
if (send_file(thd))
{
errmsg = "failed in send_file()";
my_errno= ER_UNKNOWN_ERROR;
goto err;
}
}
packet->set("\0", 1, &my_charset_bin);
}
/*
TODO: now that we are logging the offset, check to make sure
the recorded offset and the actual match
*/
if (error != LOG_READ_EOF)
{
my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
switch (error) {
case LOG_READ_BOGUS:
errmsg = "bogus data in log event";
break;
case LOG_READ_TOO_LARGE:
errmsg = "log event entry exceeded max_allowed_packet; \
Increase max_allowed_packet on master";
break;
case LOG_READ_IO:
errmsg = "I/O error reading log event";
break;
case LOG_READ_MEM:
errmsg = "memory allocation failed reading log event";
break;
case LOG_READ_TRUNC:
errmsg = "binlog truncated in the middle of event";
break;
default:
errmsg = "unknown error reading log event on the master";
break;
}
goto err;
}
if (!(flags & BINLOG_DUMP_NON_BLOCK) &&
mysql_bin_log.is_active(log_file_name))
{
/*
Block until there is more data in the log
*/
if (net_flush(net))
{
errmsg = "failed on net_flush()";
my_errno= ER_UNKNOWN_ERROR;
goto err;
}
/*
We may have missed the update broadcast from the log
that has just happened, let's try to catch it if it did.
If we did not miss anything, we just wait for other threads
to signal us.
*/
{
log.error=0;
bool read_packet = 0, fatal_error = 0;
#ifndef DBUG_OFF
if (max_binlog_dump_events && !left_events--)
{
errmsg = "Debugging binlog dump abort";
my_errno= ER_UNKNOWN_ERROR;
goto err;
}
#endif
/*
No one will update the log while we are reading
now, but we'll be quick and just read one record
TODO:
Add an counter that is incremented for each time we update
the binary log. We can avoid the following read if the counter
has not been updated since last read.
*/
pthread_mutex_lock(log_lock);
switch (Log_event::read_log_event(&log, packet, (pthread_mutex_t*)0)) {
case 0:
/* we read successfully, so we'll need to send it to the slave */
pthread_mutex_unlock(log_lock);
read_packet = 1;
break;
case LOG_READ_EOF:
DBUG_PRINT("wait",("waiting for data in binary log"));
if (thd->server_id==0) // for mysqlbinlog (mysqlbinlog.server_id==0)
{
pthread_mutex_unlock(log_lock);
goto end;
}
if (!thd->killed)
{
/* Note that the following call unlocks lock_log */
mysql_bin_log.wait_for_update(thd, 0);
}
else
pthread_mutex_unlock(log_lock);
DBUG_PRINT("wait",("binary log received update"));
break;
default:
pthread_mutex_unlock(log_lock);
fatal_error = 1;
break;
}
if (read_packet)
{
thd->proc_info = "Sending binlog event to slave";
if (my_net_write(net, (char*)packet->ptr(), packet->length()) )
{
errmsg = "Failed on my_net_write()";
my_errno= ER_UNKNOWN_ERROR;
goto err;
}
if ((*packet)[LOG_EVENT_OFFSET+1] == LOAD_EVENT)
{
if (send_file(thd))
{
errmsg = "failed in send_file()";
my_errno= ER_UNKNOWN_ERROR;
goto err;
}
}
packet->set("\0", 1, &my_charset_bin);
/*
No need to net_flush because we will get to flush later when
we hit EOF pretty quick
*/
}
if (fatal_error)
{
errmsg = "error reading log entry";
my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
goto err;
}
log.error=0;
}
}
else
{
bool loop_breaker = 0;
// need this to break out of the for loop from switch
thd->proc_info = "Finished reading one binlog; switching to next binlog";
switch (mysql_bin_log.find_next_log(&linfo, 1)) {
case LOG_INFO_EOF:
loop_breaker = (flags & BINLOG_DUMP_NON_BLOCK);
break;
case 0:
break;
default:
errmsg = "could not find next log";
my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
goto err;
}
if (loop_breaker)
break;
end_io_cache(&log);
(void) my_close(file, MYF(MY_WME));
/*
Even if the previous log contained a Rotate_log_event, we still fake
one.
*/
if ((file=open_binlog(&log, log_file_name, &errmsg)) < 0 ||
fake_rotate_event(net, packet, log_file_name, BIN_LOG_HEADER_SIZE, &errmsg))
{
my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
goto err;
}
packet->length(0);
packet->append('\0');
}
}
end:
end_io_cache(&log);
(void)my_close(file, MYF(MY_WME));
send_eof(thd);
thd->proc_info = "Waiting to finalize termination";
pthread_mutex_lock(&LOCK_thread_count);
thd->current_linfo = 0;
pthread_mutex_unlock(&LOCK_thread_count);
DBUG_VOID_RETURN;
err:
thd->proc_info = "Waiting to finalize termination";
end_io_cache(&log);
/*
Exclude iteration through thread list
this is needed for purge_logs() - it will iterate through
thread list and update thd->current_linfo->index_file_offset
this mutex will make sure that it never tried to update our linfo
after we return from this stack frame
*/
pthread_mutex_lock(&LOCK_thread_count);
thd->current_linfo = 0;
pthread_mutex_unlock(&LOCK_thread_count);
if (file >= 0)
(void) my_close(file, MYF(MY_WME));
send_error(thd, my_errno, errmsg);
DBUG_VOID_RETURN;
}
int start_slave(THD* thd , MASTER_INFO* mi, bool net_report)
{
int slave_errno= 0;
int thread_mask;
DBUG_ENTER("start_slave");
if (check_access(thd, SUPER_ACL, any_db,0,0,0))
DBUG_RETURN(1);
lock_slave_threads(mi); // this allows us to cleanly read slave_running
// Get a mask of _stopped_ threads
init_thread_mask(&thread_mask,mi,1 /* inverse */);
/*
Below we will start all stopped threads.
But if the user wants to start only one thread, do as if the other thread
was running (as we don't wan't to touch the other thread), so set the
bit to 0 for the other thread
*/
if (thd->lex->slave_thd_opt)
thread_mask&= thd->lex->slave_thd_opt;
if (thread_mask) //some threads are stopped, start them
{
if (init_master_info(mi,master_info_file,relay_log_info_file, 0))
slave_errno=ER_MASTER_INFO;
else if (server_id_supplied && *mi->host)
{
/*
If we will start SQL thread we will care about UNTIL options
If not and they are specified we will ignore them and warn user
about this fact.
*/
if (thread_mask & SLAVE_SQL)
{
pthread_mutex_lock(&mi->rli.data_lock);
if (thd->lex->mi.pos)
{
mi->rli.until_condition= RELAY_LOG_INFO::UNTIL_MASTER_POS;
mi->rli.until_log_pos= thd->lex->mi.pos;
/*
We don't check thd->lex->mi.log_file_name for NULL here
since it is checked in sql_yacc.yy
*/
strmake(mi->rli.until_log_name, thd->lex->mi.log_file_name,
sizeof(mi->rli.until_log_name)-1);
}
else if (thd->lex->mi.relay_log_pos)
{
mi->rli.until_condition= RELAY_LOG_INFO::UNTIL_RELAY_POS;
mi->rli.until_log_pos= thd->lex->mi.relay_log_pos;
strmake(mi->rli.until_log_name, thd->lex->mi.relay_log_name,
sizeof(mi->rli.until_log_name)-1);
}
else
clear_until_condition(&mi->rli);
if (mi->rli.until_condition != RELAY_LOG_INFO::UNTIL_NONE)
{
/* Preparing members for effective until condition checking */
const char *p= fn_ext(mi->rli.until_log_name);
char *p_end;
if (*p)
{
//p points to '.'
mi->rli.until_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)
slave_errno=ER_BAD_SLAVE_UNTIL_COND;
}
else
slave_errno=ER_BAD_SLAVE_UNTIL_COND;
/* mark the cached result of the UNTIL comparison as "undefined" */
mi->rli.until_log_names_cmp_result=
RELAY_LOG_INFO::UNTIL_LOG_NAMES_CMP_UNKNOWN;
/* Issuing warning then started without --skip-slave-start */
if (!opt_skip_slave_start)
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_MISSING_SKIP_SLAVE,
ER(ER_MISSING_SKIP_SLAVE));
}
pthread_mutex_unlock(&mi->rli.data_lock);
}
else if (thd->lex->mi.pos || thd->lex->mi.relay_log_pos)
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_UNTIL_COND_IGNORED,
ER(ER_UNTIL_COND_IGNORED));
if (!slave_errno)
slave_errno = start_slave_threads(0 /*no mutex */,
1 /* wait for start */,
mi,
master_info_file,relay_log_info_file,
thread_mask);
}
else
slave_errno = ER_BAD_SLAVE;
}
else
//no error if all threads are already started, only a warning
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_SLAVE_WAS_RUNNING,
ER(ER_SLAVE_WAS_RUNNING));
unlock_slave_threads(mi);
if (slave_errno)
{
if (net_report)
send_error(thd, slave_errno);
DBUG_RETURN(1);
}
else if (net_report)
send_ok(thd);
DBUG_RETURN(0);
}
int stop_slave(THD* thd, MASTER_INFO* mi, bool net_report )
{
int slave_errno;
if (!thd)
thd = current_thd;
if (check_access(thd, SUPER_ACL, any_db,0,0,0))
return 1;
thd->proc_info = "Killing slave";
int thread_mask;
lock_slave_threads(mi);
// Get a mask of _running_ threads
init_thread_mask(&thread_mask,mi,0 /* not inverse*/);
/*
Below we will stop all running threads.
But if the user wants to stop only one thread, do as if the other thread
was stopped (as we don't wan't to touch the other thread), so set the
bit to 0 for the other thread
*/
if (thd->lex->slave_thd_opt)
thread_mask &= thd->lex->slave_thd_opt;
if (thread_mask)
{
slave_errno= terminate_slave_threads(mi,thread_mask,
1 /*skip lock */);
}
else
{
//no error if both threads are already stopped, only a warning
slave_errno= 0;
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_SLAVE_WAS_NOT_RUNNING,
ER(ER_SLAVE_WAS_NOT_RUNNING));
}
unlock_slave_threads(mi);
thd->proc_info = 0;
if (slave_errno)
{
if (net_report)
send_error(thd, slave_errno);
return 1;
}
else if (net_report)
send_ok(thd);
return 0;
}
/*
Remove all relay logs and start replication from the start
SYNOPSIS
reset_slave()
thd Thread handler
mi Master info for the slave
RETURN
0 ok
1 error
*/
int reset_slave(THD *thd, MASTER_INFO* mi)
{
MY_STAT stat_area;
char fname[FN_REFLEN];
int thread_mask= 0, error= 0;
uint sql_errno=0;
const char* errmsg=0;
DBUG_ENTER("reset_slave");
lock_slave_threads(mi);
init_thread_mask(&thread_mask,mi,0 /* not inverse */);
if (thread_mask) // We refuse if any slave thread is running
{
sql_errno= ER_SLAVE_MUST_STOP;
error=1;
goto err;
}
// delete relay logs, clear relay log coordinates
if ((error= purge_relay_logs(&mi->rli, thd,
1 /* just reset */,
&errmsg)))
goto err;
/*
Clear master's log coordinates and reset host/user/etc to the values
specified in mysqld's options (only for good display of SHOW SLAVE STATUS;
next init_master_info() (in start_slave() for example) would have set them
the same way; but here this is for the case where the user does SHOW SLAVE
STATUS; before doing START SLAVE;
*/
init_master_info_with_options(mi);
/*
Reset errors, and master timestamp (the idea is that we forget about the
old master).
*/
clear_slave_error_timestamp(&mi->rli);
clear_until_condition(&mi->rli);
// close master_info_file, relay_log_info_file, set mi->inited=rli->inited=0
end_master_info(mi);
// and delete these two files
fn_format(fname, master_info_file, mysql_data_home, "", 4+32);
if (my_stat(fname, &stat_area, MYF(0)) && my_delete(fname, MYF(MY_WME)))
{
error=1;
goto err;
}
// delete relay_log_info_file
fn_format(fname, relay_log_info_file, mysql_data_home, "", 4+32);
if (my_stat(fname, &stat_area, MYF(0)) && my_delete(fname, MYF(MY_WME)))
{
error=1;
goto err;
}
err:
unlock_slave_threads(mi);
if (error)
my_error(sql_errno, MYF(0), errmsg);
DBUG_RETURN(error);
}
/*
Kill all Binlog_dump threads which previously talked to the same slave
("same" means with the same server id). Indeed, if the slave stops, if the
Binlog_dump thread is waiting (pthread_cond_wait) for binlog update, then it
will keep existing until a query is written to the binlog. If the master is
idle, then this could last long, and if the slave reconnects, we could have 2
Binlog_dump threads in SHOW PROCESSLIST, until a query is written to the
binlog. To avoid this, when the slave reconnects and sends COM_BINLOG_DUMP,
the master kills any existing thread with the slave's server id (if this id is
not zero; it will be true for real slaves, but false for mysqlbinlog when it
sends COM_BINLOG_DUMP to get a remote binlog dump).
SYNOPSIS
kill_zombie_dump_threads()
slave_server_id the slave's server id
*/
void kill_zombie_dump_threads(uint32 slave_server_id)
{
pthread_mutex_lock(&LOCK_thread_count);
I_List_iterator<THD> it(threads);
THD *tmp;
while ((tmp=it++))
{
if (tmp->command == COM_BINLOG_DUMP &&
tmp->server_id == slave_server_id)
{
pthread_mutex_lock(&tmp->LOCK_delete); // Lock from delete
break;
}
}
pthread_mutex_unlock(&LOCK_thread_count);
if (tmp)
{
/*
Here we do not call kill_one_thread() as
it will be slow because it will iterate through the list
again. We just to do kill the thread ourselves.
*/
tmp->awake(1/*prepare to die*/);
pthread_mutex_unlock(&tmp->LOCK_delete);
}
}
int change_master(THD* thd, MASTER_INFO* mi)
{
int thread_mask;
const char* errmsg= 0;
bool need_relay_log_purge= 1;
DBUG_ENTER("change_master");
lock_slave_threads(mi);
init_thread_mask(&thread_mask,mi,0 /*not inverse*/);
if (thread_mask) // We refuse if any slave thread is running
{
net_printf(thd,ER_SLAVE_MUST_STOP);
unlock_slave_threads(mi);
DBUG_RETURN(1);
}
thd->proc_info = "Changing master";
LEX_MASTER_INFO* lex_mi= &thd->lex->mi;
// TODO: see if needs re-write
if (init_master_info(mi, master_info_file, relay_log_info_file, 0))
{
send_error(thd, ER_MASTER_INFO);
unlock_slave_threads(mi);
DBUG_RETURN(1);
}
/*
Data lock not needed since we have already stopped the running threads,
and we have the hold on the run locks which will keep all threads that
could possibly modify the data structures from running
*/
/*
If the user specified host or port without binlog or position,
reset binlog's name to FIRST and position to 4.
*/
if ((lex_mi->host || lex_mi->port) && !lex_mi->log_file_name && !lex_mi->pos)
{
mi->master_log_name[0] = 0;
mi->master_log_pos= BIN_LOG_HEADER_SIZE;
}
if (lex_mi->log_file_name)
strmake(mi->master_log_name, lex_mi->log_file_name,
sizeof(mi->master_log_name)-1);
if (lex_mi->pos)
{
mi->master_log_pos= lex_mi->pos;
}
DBUG_PRINT("info", ("master_log_pos: %d", (ulong) mi->master_log_pos));
if (lex_mi->host)
strmake(mi->host, lex_mi->host, sizeof(mi->host)-1);
if (lex_mi->user)
strmake(mi->user, lex_mi->user, sizeof(mi->user)-1);
if (lex_mi->password)
strmake(mi->password, lex_mi->password, sizeof(mi->password)-1);
if (lex_mi->port)
mi->port = lex_mi->port;
if (lex_mi->connect_retry)
mi->connect_retry = lex_mi->connect_retry;
if (lex_mi->ssl != LEX_MASTER_INFO::SSL_UNCHANGED)
mi->ssl= (lex_mi->ssl == LEX_MASTER_INFO::SSL_ENABLE);
if (lex_mi->ssl_ca)
strmake(mi->ssl_ca, lex_mi->ssl_ca, sizeof(mi->ssl_ca)-1);
if (lex_mi->ssl_capath)
strmake(mi->ssl_capath, lex_mi->ssl_capath, sizeof(mi->ssl_capath)-1);
if (lex_mi->ssl_cert)
strmake(mi->ssl_cert, lex_mi->ssl_cert, sizeof(mi->ssl_cert)-1);
if (lex_mi->ssl_cipher)
strmake(mi->ssl_cipher, lex_mi->ssl_cipher, sizeof(mi->ssl_cipher)-1);
if (lex_mi->ssl_key)
strmake(mi->ssl_key, lex_mi->ssl_key, sizeof(mi->ssl_key)-1);
#ifndef HAVE_OPENSSL
if (lex_mi->ssl || lex_mi->ssl_ca || lex_mi->ssl_capath ||
lex_mi->ssl_cert || lex_mi->ssl_cipher || lex_mi->ssl_key )
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
ER_SLAVE_IGNORED_SSL_PARAMS, ER(ER_SLAVE_IGNORED_SSL_PARAMS));
#endif
if (lex_mi->relay_log_name)
{
need_relay_log_purge= 0;
strmake(mi->rli.group_relay_log_name,lex_mi->relay_log_name,
sizeof(mi->rli.group_relay_log_name)-1);
strmake(mi->rli.event_relay_log_name,lex_mi->relay_log_name,
sizeof(mi->rli.event_relay_log_name)-1);
}
if (lex_mi->relay_log_pos)
{
need_relay_log_purge= 0;
mi->rli.group_relay_log_pos= mi->rli.event_relay_log_pos= lex_mi->relay_log_pos;
}
/*
If user did specify neither host nor port nor any log name nor any log
pos, i.e. he specified only user/password/master_connect_retry, he probably
wants replication to resume from where it had left, i.e. from the
coordinates of the **SQL** thread (imagine the case where the I/O is ahead
of the SQL; restarting from the coordinates of the I/O would lose some
events which is probably unwanted when you are just doing minor changes
like changing master_connect_retry).
A side-effect is that if only the I/O thread was started, this thread may
restart from ''/4 after the CHANGE MASTER. That's a minor problem (it is a
much more unlikely situation than the one we are fixing here).
Note: coordinates of the SQL thread must be read here, before the
'if (need_relay_log_purge)' block which resets them.
*/
if (!lex_mi->host && !lex_mi->port &&
!lex_mi->log_file_name && !lex_mi->pos &&
need_relay_log_purge)
{
/*
Sometimes mi->rli.master_log_pos == 0 (it happens when the SQL thread is
not initialized), so we use a max().
What happens to mi->rli.master_log_pos during the initialization stages
of replication is not 100% clear, so we guard against problems using
max().
*/
mi->master_log_pos = max(BIN_LOG_HEADER_SIZE,
mi->rli.group_master_log_pos);
strmake(mi->master_log_name, mi->rli.group_master_log_name,
sizeof(mi->master_log_name)-1);
}
/*
Relay log's IO_CACHE may not be inited, if rli->inited==0 (server was never
a slave before).
*/
flush_master_info(mi, 0);
if (need_relay_log_purge)
{
relay_log_purge= 1;
thd->proc_info="Purging old relay logs";
if (purge_relay_logs(&mi->rli, thd,
0 /* not only reset, but also reinit */,
&errmsg))
{
net_printf(thd, 0, "Failed purging old relay logs: %s",errmsg);
unlock_slave_threads(mi);
DBUG_RETURN(1);
}
}
else
{
const char* msg;
relay_log_purge= 0;
/* Relay log is already initialized */
if (init_relay_log_pos(&mi->rli,
mi->rli.group_relay_log_name,
mi->rli.group_relay_log_pos,
0 /*no data lock*/,
&msg))
{
net_printf(thd,0,"Failed initializing relay log position: %s",msg);
unlock_slave_threads(mi);
DBUG_RETURN(1);
}
}
mi->rli.group_master_log_pos = mi->master_log_pos;
DBUG_PRINT("info", ("master_log_pos: %d", (ulong) mi->master_log_pos));
/*
Coordinates in rli were spoilt by the 'if (need_relay_log_purge)' block,
so restore them to good values. If we left them to ''/0, that would work;
but that would fail in the case of 2 successive CHANGE MASTER (without a
START SLAVE in between): because first one would set the coords in mi to
the good values of those in rli, the set those in rli to ''/0, then
second CHANGE MASTER would set the coords in mi to those of rli, i.e. to
''/0: we have lost all copies of the original good coordinates.
That's why we always save good coords in rli.
*/
mi->rli.group_master_log_pos= mi->master_log_pos;
strmake(mi->rli.group_master_log_name,mi->master_log_name,
sizeof(mi->rli.group_master_log_name)-1);
if (!mi->rli.group_master_log_name[0]) // uninitialized case
mi->rli.group_master_log_pos=0;
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, and master timestamp */
clear_slave_error_timestamp(&mi->rli);
clear_until_condition(&mi->rli);
/*
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
before START SLAVE, then old will remain in relay-log.info, and will be the
in-memory value at restart (thus causing errors, as the old relay log does
not exist anymore).
*/
flush_relay_log_info(&mi->rli);
pthread_cond_broadcast(&mi->data_cond);
pthread_mutex_unlock(&mi->rli.data_lock);
unlock_slave_threads(mi);
thd->proc_info = 0;
send_ok(thd);
DBUG_RETURN(0);
}
int reset_master(THD* thd)
{
if (!mysql_bin_log.is_open())
{
my_error(ER_FLUSH_MASTER_BINLOG_CLOSED, MYF(ME_BELL+ME_WAITTANG));
return 1;
}
return mysql_bin_log.reset_logs(thd);
}
int cmp_master_pos(const char* log_file_name1, ulonglong log_pos1,
const char* log_file_name2, ulonglong log_pos2)
{
int res;
uint log_file_name1_len= strlen(log_file_name1);
uint log_file_name2_len= strlen(log_file_name2);
// We assume that both log names match up to '.'
if (log_file_name1_len == log_file_name2_len)
{
if ((res= strcmp(log_file_name1, log_file_name2)))
return res;
return (log_pos1 < log_pos2) ? -1 : (log_pos1 == log_pos2) ? 0 : 1;
}
return ((log_file_name1_len < log_file_name2_len) ? -1 : 1);
}
int show_binlog_events(THD* thd)
{
Protocol *protocol= thd->protocol;
DBUG_ENTER("show_binlog_events");
List<Item> field_list;
const char *errmsg = 0;
IO_CACHE log;
File file = -1;
Log_event::init_show_field_list(&field_list);
if (protocol-> send_fields(&field_list, 1))
DBUG_RETURN(-1);
if (mysql_bin_log.is_open())
{
LEX_MASTER_INFO *lex_mi= &thd->lex->mi;
ha_rows event_count, limit_start, limit_end;
my_off_t pos = max(BIN_LOG_HEADER_SIZE, lex_mi->pos); // user-friendly
char search_file_name[FN_REFLEN], *name;
const char *log_file_name = lex_mi->log_file_name;
pthread_mutex_t *log_lock = mysql_bin_log.get_log_lock();
LOG_INFO linfo;
Log_event* ev;
limit_start= thd->lex->current_select->offset_limit;
limit_end= thd->lex->current_select->select_limit + limit_start;
name= search_file_name;
if (log_file_name)
mysql_bin_log.make_log_name(search_file_name, log_file_name);
else
name=0; // Find first log
linfo.index_file_offset = 0;
thd->current_linfo = &linfo;
if (mysql_bin_log.find_log_pos(&linfo, name, 1))
{
errmsg = "Could not find target log";
goto err;
}
if ((file=open_binlog(&log, linfo.log_file_name, &errmsg)) < 0)
goto err;
pthread_mutex_lock(log_lock);
my_b_seek(&log, pos);
for (event_count = 0;
(ev = Log_event::read_log_event(&log,(pthread_mutex_t*)0,0)); )
{
if (event_count >= limit_start &&
ev->net_send(protocol, linfo.log_file_name, pos))
{
errmsg = "Net error";
delete ev;
pthread_mutex_unlock(log_lock);
goto err;
}
pos = my_b_tell(&log);
delete ev;
if (++event_count >= limit_end)
break;
}
if (event_count < limit_end && log.error)
{
errmsg = "Wrong offset or I/O error";
pthread_mutex_unlock(log_lock);
goto err;
}
pthread_mutex_unlock(log_lock);
}
err:
if (file >= 0)
{
end_io_cache(&log);
(void) my_close(file, MYF(MY_WME));
}
if (errmsg)
{
my_error(ER_ERROR_WHEN_EXECUTING_COMMAND, MYF(0),
"SHOW BINLOG EVENTS", errmsg);
DBUG_RETURN(-1);
}
send_eof(thd);
pthread_mutex_lock(&LOCK_thread_count);
thd->current_linfo = 0;
pthread_mutex_unlock(&LOCK_thread_count);
DBUG_RETURN(0);
}
int show_binlog_info(THD* thd)
{
Protocol *protocol= thd->protocol;
DBUG_ENTER("show_binlog_info");
List<Item> field_list;
field_list.push_back(new Item_empty_string("File", FN_REFLEN));
field_list.push_back(new Item_return_int("Position",20,
MYSQL_TYPE_LONGLONG));
field_list.push_back(new Item_empty_string("Binlog_Do_DB",255));
field_list.push_back(new Item_empty_string("Binlog_Ignore_DB",255));
if (protocol->send_fields(&field_list, 1))
DBUG_RETURN(-1);
protocol->prepare_for_resend();
if (mysql_bin_log.is_open())
{
LOG_INFO li;
mysql_bin_log.get_current_log(&li);
int dir_len = dirname_length(li.log_file_name);
protocol->store(li.log_file_name + dir_len, &my_charset_bin);
protocol->store((ulonglong) li.pos);
protocol->store(&binlog_do_db);
protocol->store(&binlog_ignore_db);
if (protocol->write())
DBUG_RETURN(-1);
}
send_eof(thd);
DBUG_RETURN(0);
}
/*
Send a list of all binary logs to client
SYNOPSIS
show_binlogs()
thd Thread specific variable
RETURN VALUES
0 ok
1 error (Error message sent to client)
*/
int show_binlogs(THD* thd)
{
IO_CACHE *index_file;
char fname[FN_REFLEN];
List<Item> field_list;
uint length;
Protocol *protocol= thd->protocol;
DBUG_ENTER("show_binlogs");
if (!mysql_bin_log.is_open())
{
//TODO: Replace with ER() error message
send_error(thd, 0, "You are not using binary logging");
return 1;
}
field_list.push_back(new Item_empty_string("Log_name", 255));
if (protocol->send_fields(&field_list, 1))
DBUG_RETURN(1);
mysql_bin_log.lock_index();
index_file=mysql_bin_log.get_index_file();
reinit_io_cache(index_file, READ_CACHE, (my_off_t) 0, 0, 0);
/* The file ends with EOF or empty line */
while ((length=my_b_gets(index_file, fname, sizeof(fname))) > 1)
{
protocol->prepare_for_resend();
int dir_len = dirname_length(fname);
/* The -1 is for removing newline from fname */
protocol->store(fname + dir_len, length-1-dir_len, &my_charset_bin);
if (protocol->write())
goto err;
}
mysql_bin_log.unlock_index();
send_eof(thd);
DBUG_RETURN(0);
err:
mysql_bin_log.unlock_index();
DBUG_RETURN(1);
}
int log_loaded_block(IO_CACHE* file)
{
LOAD_FILE_INFO* lf_info;
uint block_len ;
/* file->request_pos contains position where we started last read */
char* buffer = (char*) file->request_pos;
if (!(block_len = (char*) file->read_end - (char*) buffer))
return 0;
lf_info = (LOAD_FILE_INFO*) file->arg;
if (lf_info->last_pos_in_file != HA_POS_ERROR &&
lf_info->last_pos_in_file >= file->pos_in_file)
return 0;
lf_info->last_pos_in_file = file->pos_in_file;
if (lf_info->wrote_create_file)
{
Append_block_log_event a(lf_info->thd, lf_info->db, buffer, block_len,
lf_info->log_delayed);
mysql_bin_log.write(&a);
}
else
{
Create_file_log_event c(lf_info->thd,lf_info->ex,lf_info->db,
lf_info->table_name, *lf_info->fields,
lf_info->handle_dup, buffer,
block_len, lf_info->log_delayed);
mysql_bin_log.write(&c);
lf_info->wrote_create_file = 1;
DBUG_SYNC_POINT("debug_lock.created_file_event",10);
}
return 0;
}
#endif /* HAVE_REPLICATION */
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