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https://github.com/MariaDB/server.git
synced 2025-11-19 19:03:26 +03:00
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.
41 lines
2.9 KiB
Plaintext
41 lines
2.9 KiB
Plaintext
SET @start_max_allowed_packet= @@global.max_allowed_packet;
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SET @start_value= @@global.net_buffer_length;
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drop table if exists t1;
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## Creating new table t1 ##
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CREATE TABLE t1
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(
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id INT NOT NULL auto_increment,
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PRIMARY KEY (id),
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name BLOB
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);
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'#--------------------FN_DYNVARS_070_01-------------------------#'
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## Setting value of max_allowed packet and net_buffer_length to 1024 ##
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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.net_buffer_length = 1024;
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ERROR HY000: SESSION variable 'net_buffer_length' is read-only. Use SET GLOBAL to assign the value
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SELECT @@session.net_buffer_length;
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@@session.net_buffer_length
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16384
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'#--------------------FN_DYNVARS_070_02-------------------------#'
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## Setting value of max_allowed packet and net_buffer_length to 1024 ##
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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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SET @@global.net_buffer_length = 1024;
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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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SELECT @@global.net_buffer_length;
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@@global.net_buffer_length
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1024
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## Creating new connection test_con1 ##
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## Inserting and fetching data of length greater than 1024 ##
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INSERT into t1(name) values("aaassssssssddddddddffffffgggggggg, askdlfjalsdkjfalksdjflaksdjfalkjdflaksjdflakjdflajsflajflajdfalsjfdlajfladjslfajdflajdsflajsflakjsdfla;kjflsdjkf;aljfa;lkdsfjla;sjlkajffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllakjsdffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffa;;;;;;;;;;;;;;;;;;;;;;;;;;;dsklfjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjkljffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffdkskkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk");
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drop table t1;
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SET @@global.max_allowed_packet= @start_max_allowed_packet;
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SET @@global.net_buffer_length= @start_value;
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