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Bug #42914 Log event that larger than max_allowed_packet results in stop of slave I/O thread, 

           But there is no Last_IO_Error reported.

On the master, if a binary log event is larger than max_allowed_packet,
ER_MASTER_FATAL_ERROR_READING_BINLOG and the specific reason of this error is
sent to a slave when it requests a dump from the master, thus leading
the I/O thread to stop.

On a slave, the I/O thread stops when receiving a packet larger than max_allowed_packet.

In both cases, however, there was no Last_IO_Error reported.

This patch adds code to report the Last_IO_Error and exact reason before stopping the
I/O thread and also reports the case the out memory pops up while
handling packets from the master.


sql/sql_repl.cc:
  The master send the Specific reasons instead of "error reading log entry" to the slave which is requesting a dump.
  if an fatal error is returned by read_log_event function.
parent db31c7bc
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Showing with 58 additions and 15 deletions
mysql-test/suite/rpl/r/rpl_packet.result
View file @ 6c75fa09
......@@ -32,6 +32,21 @@ include/start_slave.inc
CREATE TABLE `t1` (`f1` LONGTEXT) ENGINE=MyISAM;
INSERT INTO `t1`(`f1`) VALUES ('aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa2048');
Slave_IO_Running = No (expect No)
SELECT "Got a packet bigger than 'max_allowed_packet' bytes" AS Last_IO_Error;
Last_IO_Error
Got a packet bigger than 'max_allowed_packet' bytes
stop slave;
drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
reset master;
reset slave;
drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
start slave;
CREATE TABLE t1 (f1 int PRIMARY KEY, f2 LONGTEXT, f3 LONGTEXT) ENGINE=MyISAM;
INSERT INTO t1(f1, f2, f3) VALUES(1, REPEAT('a', @@global.max_allowed_packet), REPEAT('b', @@global.max_allowed_packet));
Slave_IO_Running = No (expect No)
SELECT "Got fatal error 1236 from master when reading data from binary log: 'log event entry exceeded max_allowed_packet; Increase max_allowed_packet on master'" AS Last_IO_Error;
Last_IO_Error
Got fatal error 1236 from master when reading data from binary log: 'log event entry exceeded max_allowed_packet; Increase max_allowed_packet on master'
==== clean up ====
DROP TABLE t1;
SET @@global.max_allowed_packet= 1024;
......
mysql-test/suite/rpl/t/rpl_packet.test
View file @ 6c75fa09
......@@ -5,6 +5,7 @@
# max-out size db name
source include/master-slave.inc;
source include/have_binlog_format_row.inc;
let $db= DB_NAME_OF_MAX_LENGTH_AKA_NAME_LEN_64_BYTES_____________________;
disable_warnings;
......@@ -86,6 +87,35 @@ connection slave;
--source include/wait_for_slave_io_to_stop.inc
let $slave_io_running= query_get_value(SHOW SLAVE STATUS, Slave_IO_Running, 1);
--echo Slave_IO_Running = $slave_io_running (expect No)
#
# Bug#42914: The slave I/O thread must stop after trying to read the above
# event, However there is no Last_IO_Error report.
#
let $last_io_error= query_get_value(SHOW SLAVE STATUS, Last_IO_Error, 1);
eval SELECT "$last_io_error" AS Last_IO_Error;
#
# Bug#42914: On the master, if a binary log event is larger than
# max_allowed_packet, the error message ER_MASTER_FATAL_ERROR_READING_BINLOG
# is sent to a slave when it requests a dump from the master, thus leading the
# I/O thread to stop. However, there is no Last_IO_Error reported.
#
source include/master-slave-reset.inc;
connection master;
CREATE TABLE t1 (f1 int PRIMARY KEY, f2 LONGTEXT, f3 LONGTEXT) ENGINE=MyISAM;
sync_slave_with_master;
connection master;
INSERT INTO t1(f1, f2, f3) VALUES(1, REPEAT('a', @@global.max_allowed_packet), REPEAT('b', @@global.max_allowed_packet));
connection slave;
# The slave I/O thread must stop after receiving
# ER_MASTER_FATAL_ERROR_READING_BINLOG error message from master.
--source include/wait_for_slave_io_to_stop.inc
let $slave_io_running= query_get_value(SHOW SLAVE STATUS, Slave_IO_Running, 1);
--echo Slave_IO_Running = $slave_io_running (expect No)
let $last_io_error= query_get_value(SHOW SLAVE STATUS, Last_IO_Error, 1);
eval SELECT "$last_io_error" AS Last_IO_Error;
--echo ==== clean up ====
connection master;
......
sql/share/errmsg.txt
View file @ 6c75fa09
......@@ -4702,7 +4702,7 @@ ER_NOT_SUPPORTED_YET 42000
swe "Denna version av MySQL kan nnu inte utfra '%s'"
ER_MASTER_FATAL_ERROR_READING_BINLOG
nla "Kreeg fatale fout %d: '%-.128s' van master tijdens lezen van data uit binaire log"
eng "Got fatal error %d: '%-.128s' from master when reading data from binary log"
eng "Got fatal error %d from master when reading data from binary log: '%-.128s'"
ger "Schwerer Fehler %d: '%-.128s vom Master beim Lesen des binren Logs"
ita "Errore fatale %d: '%-.128s' dal master leggendo i dati dal log binario"
por "Obteve fatal erro %d: '%-.128s' do master quando lendo dados do binary log"
......
sql/slave.cc
View file @ 6c75fa09
......@@ -2678,15 +2678,19 @@ Log entry on master is longer than max_allowed_packet (%ld) on \
slave. If the entry is correct, restart the server with a higher value of \
max_allowed_packet",
thd->variables.max_allowed_packet);
mi->report(ERROR_LEVEL, ER_NET_PACKET_TOO_LARGE,
ER(ER_NET_PACKET_TOO_LARGE));
goto err;
case ER_MASTER_FATAL_ERROR_READING_BINLOG:
sql_print_error(ER(mysql_error_number), mysql_error_number,
mysql_error(mysql));
mi->report(ERROR_LEVEL, ER_MASTER_FATAL_ERROR_READING_BINLOG,
ER(ER_MASTER_FATAL_ERROR_READING_BINLOG),
mysql_error_number, mysql_error(mysql));
goto err;
case EE_OUTOFMEMORY:
case ER_OUTOFMEMORY:
case ER_OUT_OF_RESOURCES:
sql_print_error("\
Stopping slave I/O thread due to out-of-memory error from master");
mi->report(ERROR_LEVEL, ER_OUT_OF_RESOURCES,
ER(ER_OUT_OF_RESOURCES));
goto err;
}
if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
......
sql/sql_repl.cc
View file @ 6c75fa09
......@@ -623,7 +623,7 @@ impossible position";
*/
{
log.error=0;
bool read_packet = 0, fatal_error = 0;
bool read_packet = 0;
#ifndef DBUG_OFF
if (max_binlog_dump_events && !left_events--)
......@@ -645,7 +645,7 @@ impossible position";
*/
pthread_mutex_lock(log_lock);
switch (Log_event::read_log_event(&log, packet, (pthread_mutex_t*)0)) {
switch (error= 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);
......@@ -671,8 +671,8 @@ impossible position";
default:
pthread_mutex_unlock(log_lock);
fatal_error = 1;
break;
test_for_non_eof_log_read_errors(error, &errmsg);
goto err;
}
if (read_packet)
......@@ -701,12 +701,6 @@ impossible position";
*/
}
if (fatal_error)
{
errmsg = "error reading log entry";
my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;
goto err;
}
log.error=0;
}
}
......
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