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https://github.com/MariaDB/server.git
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1605b7f68f
Problem
========
SQL statements close to the size of max_allowed_packet produce binary
log events larger than max_allowed_packet.
The reason why this failure is occuring is because the event length is
more than the total size of the max_allowed_packet + max_event_header
length. Now since the event length exceeds this size master Dump
thread is unable to send the packet on to the slave.
That can happen e.g with row-based replication in Update_rows event.
Fix
====
The problem was fixed by increasing the max_allowed_packet for the
slave's threads (IO/SQL) by increasing it to 1GB.
This is done using the new server option included which is used to
regulate the max_allowed_packet of the slave thread (IO/SQL).
This causes the large packets to be received by the slave and apply
it successfully.
sql/log_event.h:
Added the new option in the log_event.h file.
sql/mysqld.cc:
Added a new option to the server.
sql/slave.cc:
Increasing the session max_allowed_packet to a large value ,
i.e. not taking global(max_allowed) into consideration, for the slave's threads.
204 lines
8.3 KiB
Plaintext
204 lines
8.3 KiB
Plaintext
SET @start_global_value = @@global.max_allowed_packet;
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SELECT @start_global_value;
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@start_global_value
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1048576
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SET @@global.max_allowed_packet = DEFAULT;
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'#--------------------FN_DYNVARS_070_01-------------------------#'
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SET @@global.max_allowed_packet = 1000;
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Warnings:
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Warning 1292 Truncated incorrect max_allowed_packet value: '1000'
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Warning 1708 The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
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SET @@global.max_allowed_packet = DEFAULT;
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SELECT @@global.max_allowed_packet;
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@@global.max_allowed_packet
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1048576
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SET @@session.max_allowed_packet = 20000;
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ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
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SET @@session.max_allowed_packet = DEFAULT;
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ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
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SELECT @@session.max_allowed_packet;
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@@session.max_allowed_packet
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1048576
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'#--------------------FN_DYNVARS_070_02-------------------------#'
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SET @@global.max_allowed_packet = DEFAULT;
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SELECT @@global.max_allowed_packet = 1048576;
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@@global.max_allowed_packet = 1048576
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1
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'#--------------------FN_DYNVARS_070_03-------------------------#'
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SET @@global.max_allowed_packet = 1024;
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Warnings:
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Warning 1708 The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
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SELECT @@global.max_allowed_packet;
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@@global.max_allowed_packet
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1024
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SET @@global.max_allowed_packet = 1025;
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Warnings:
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Warning 1292 Truncated incorrect max_allowed_packet value: '1025'
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Warning 1708 The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
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SELECT @@global.max_allowed_packet;
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@@global.max_allowed_packet
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1024
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SET @@global.max_allowed_packet = 1073741824;
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SELECT @@global.max_allowed_packet;
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@@global.max_allowed_packet
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1073741824
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SET @@global.max_allowed_packet = 1073741823;
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Warnings:
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Warning 1292 Truncated incorrect max_allowed_packet value: '1073741823'
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SELECT @@global.max_allowed_packet;
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@@global.max_allowed_packet
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1073740800
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'#--------------------FN_DYNVARS_070_04-------------------------#'
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SET @@session.max_allowed_packet = 1024;
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ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
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SELECT @@session.max_allowed_packet;
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@@session.max_allowed_packet
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1048576
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SET @@session.max_allowed_packet = 1025;
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ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
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SELECT @@session.max_allowed_packet;
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@@session.max_allowed_packet
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1048576
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SET @@session.max_allowed_packet = 65535;
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ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
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SELECT @@session.max_allowed_packet;
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@@session.max_allowed_packet
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1048576
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SET @@session.max_allowed_packet = 1073741824;
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ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
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SELECT @@session.max_allowed_packet;
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@@session.max_allowed_packet
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1048576
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SET @@session.max_allowed_packet = 1073741823;
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ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
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SELECT @@session.max_allowed_packet;
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@@session.max_allowed_packet
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1048576
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'#------------------FN_DYNVARS_070_05-----------------------#'
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SET @@global.max_allowed_packet = 0;
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Warnings:
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Warning 1292 Truncated incorrect max_allowed_packet value: '0'
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Warning 1708 The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
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SELECT @@global.max_allowed_packet;
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@@global.max_allowed_packet
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1024
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SET @@global.max_allowed_packet = -1024;
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Warnings:
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Warning 1292 Truncated incorrect max_allowed_packet value: '-1024'
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Warning 1708 The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
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SELECT @@global.max_allowed_packet;
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@@global.max_allowed_packet
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1024
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SET @@global.max_allowed_packet = 1023;
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Warnings:
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Warning 1292 Truncated incorrect max_allowed_packet value: '1023'
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Warning 1708 The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
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SELECT @@global.max_allowed_packet;
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@@global.max_allowed_packet
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1024
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SET @@global.max_allowed_packet = 10737418241;
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Warnings:
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Warning 1292 Truncated incorrect max_allowed_packet value: '10737418241'
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SELECT @@global.max_allowed_packet;
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@@global.max_allowed_packet
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1073741824
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SET @@global.max_allowed_packet = 65530.34;
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ERROR 42000: Incorrect argument type to variable 'max_allowed_packet'
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SELECT @@global.max_allowed_packet;
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@@global.max_allowed_packet
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1073741824
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SET @@global.max_allowed_packet = test;
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ERROR 42000: Incorrect argument type to variable 'max_allowed_packet'
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SELECT @@global.max_allowed_packet;
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@@global.max_allowed_packet
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1073741824
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SET @@session.max_allowed_packet = 0;
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ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
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SELECT @@session.max_allowed_packet;
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@@session.max_allowed_packet
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1048576
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SET @@session.max_allowed_packet = 1023;
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ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
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SELECT @@session.max_allowed_packet;
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@@session.max_allowed_packet
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1048576
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SET @@session.max_allowed_packet = -2;
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ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
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SELECT @@session.max_allowed_packet;
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@@session.max_allowed_packet
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1048576
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SET @@session.max_allowed_packet = 65530.34;
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ERROR 42000: Incorrect argument type to variable 'max_allowed_packet'
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SET @@session.max_allowed_packet = 10737418241;
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ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
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SELECT @@session.max_allowed_packet;
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@@session.max_allowed_packet
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1048576
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SET @@session.max_allowed_packet = test;
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ERROR 42000: Incorrect argument type to variable 'max_allowed_packet'
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SELECT @@session.max_allowed_packet;
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@@session.max_allowed_packet
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1048576
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'#------------------FN_DYNVARS_070_06-----------------------#'
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SELECT @@global.max_allowed_packet = VARIABLE_VALUE
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FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
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WHERE VARIABLE_NAME='max_allowed_packet';
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@@global.max_allowed_packet = VARIABLE_VALUE
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1
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'#------------------FN_DYNVARS_070_07-----------------------#'
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SELECT @@session.max_allowed_packet = VARIABLE_VALUE
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FROM INFORMATION_SCHEMA.SESSION_VARIABLES
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WHERE VARIABLE_NAME='max_allowed_packet';
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@@session.max_allowed_packet = VARIABLE_VALUE
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1
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'#------------------FN_DYNVARS_070_08-----------------------#'
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SET @@global.max_allowed_packet = TRUE;
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Warnings:
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Warning 1292 Truncated incorrect max_allowed_packet value: '1'
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Warning 1708 The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
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SELECT @@global.max_allowed_packet;
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@@global.max_allowed_packet
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1024
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SET @@global.max_allowed_packet = FALSE;
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Warnings:
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Warning 1292 Truncated incorrect max_allowed_packet value: '0'
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Warning 1708 The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
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SELECT @@global.max_allowed_packet;
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@@global.max_allowed_packet
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1024
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'#---------------------FN_DYNVARS_070_09----------------------#'
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SET @@global.max_allowed_packet = 2048;
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Warnings:
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Warning 1708 The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
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SELECT @@max_allowed_packet = @@global.max_allowed_packet;
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@@max_allowed_packet = @@global.max_allowed_packet
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0
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'#---------------------FN_DYNVARS_070_10----------------------#'
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SET @@max_allowed_packet = 100000;
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ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
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SELECT @@max_allowed_packet = @@local.max_allowed_packet;
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@@max_allowed_packet = @@local.max_allowed_packet
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1
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SELECT @@local.max_allowed_packet = @@session.max_allowed_packet;
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@@local.max_allowed_packet = @@session.max_allowed_packet
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1
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'#---------------------FN_DYNVARS_070_11----------------------#'
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SET max_allowed_packet = 1024;
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ERROR HY000: SESSION variable 'max_allowed_packet' is read-only. Use SET GLOBAL to assign the value
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SELECT @@max_allowed_packet;
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@@max_allowed_packet
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1048576
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SELECT local.max_allowed_packet;
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ERROR 42S02: Unknown table 'local' in field list
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SELECT session.max_allowed_packet;
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ERROR 42S02: Unknown table 'session' in field list
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SELECT max_allowed_packet = @@session.max_allowed_packet;
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ERROR 42S22: Unknown column 'max_allowed_packet' in 'field list'
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SET @@global.max_allowed_packet = @start_global_value;
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SELECT @@global.max_allowed_packet;
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@@global.max_allowed_packet
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1048576
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SELECT @@session.max_allowed_packet;
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@@session.max_allowed_packet
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1048576
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