mirror of
https://github.com/MariaDB/server.git
synced 2025-02-09 23:24:11 +01:00
abe6eb10a6
Problem:
========
180511 11:07:58 [ERROR] Slave I/O: Unexpected master's heartbeat data:
heartbeat is not compatible with local info;the event's data: log_file_name
mysql-bin.000009 log_pos 1054262041, Error_code: 1623
Analysis:
=========
In replication setup when master server doesn't have any events to send to
slave server it sends an 'Heartbeat_log_event'. This event carries the
current binary log filename and offset details. The offset values is stored
within 4 bytes of event header. When the size of binary log is higher than
UINT32_MAX the log_pos values will not fit in 4 bytes memory. It overflows
and hence slave stops with an error.
Fix:
===
Since we cannot extend the common_header of Log_event class, a greater than
4GB value of Log_event::log_pos is made to be transported with a HeartBeat
event's sub-header. Log_event::log_pos in such case is set to zero to
indicate that the 8 byte sub-header is allocated in the event.
In case of cross version replication following behaviour is expected
OLD - Server without fix
NEW - Server with fix
OLD<->NEW : works bidirectionally as long as the binlog offset is
(normally) within 4GB.
When log_pos > UINT32_MAX
OLD->NEW : The 'log_pos' is bound to overflow and NEW slave may report
an invalid event/incompatible heart beat event error.
NEW->OLD : Since patched server sets log_pos=0 on overflow, OLD slave will
report invalid event error.
44 lines
1.2 KiB
Text
44 lines
1.2 KiB
Text
# ==== Purpose ====
|
|
#
|
|
# Test verifies that slave IO thread can process heartbeat events with log_pos
|
|
# values higher than UINT32_MAX.
|
|
#
|
|
# ==== Implementation ====
|
|
#
|
|
# Steps:
|
|
# 0 - Stop slave threads. Configure a small master_heartbeat_period.
|
|
# 1 - Using debug points, simulate a huge binlog offset higher than
|
|
# UINT32_MAX on master.
|
|
# 2 - Start the slave and observe that slave IO thread is able to process
|
|
# the offset received through heartbeat event.
|
|
#
|
|
# ==== References ====
|
|
#
|
|
# MDEV-16146: MariaDB slave stops with incompatible heartbeat
|
|
#
|
|
--source include/have_debug.inc
|
|
--source include/have_innodb.inc
|
|
--source include/have_binlog_format_mixed.inc
|
|
# Test simulates binarylog offsets higher than UINT32_MAX
|
|
--source include/have_64bit.inc
|
|
--source include/master-slave.inc
|
|
|
|
--connection master
|
|
SET @saved_dbug = @@GLOBAL.debug_dbug;
|
|
SET @@global.debug_dbug= 'd,simulate_pos_4G';
|
|
|
|
--connection slave
|
|
--source include/stop_slave.inc
|
|
CHANGE MASTER TO MASTER_HEARTBEAT_PERIOD=0.001;
|
|
--source include/start_slave.inc
|
|
|
|
--connection master
|
|
sleep 1;
|
|
SET @@GLOBAL.debug_dbug = @saved_dbug;
|
|
--sync_slave_with_master
|
|
|
|
--connection master
|
|
CREATE TABLE t (f INT) ENGINE=INNODB;
|
|
INSERT INTO t VALUES (10);
|
|
DROP TABLE t;
|
|
--source include/rpl_end.inc
|