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43ec9370b3
problem:
========
mysqltest: In included file "./include/assert.inc":
included from mysql-test/suite/sys_vars/t/rpl_init_slave_func.test at line 69:
Assertion text: '@@global.max_connections = @start_max_connections'
Assertion result: '0'
mysqltest: In included file "./include/assert.inc":
included from mysql-test/suite/sys_vars/t/rpl_init_slave_func.test at line 86:
Assertion text: '@@global.max_connections = @start_max_connections + 1'
Assertion result: '0'
Analysis:
=========
A slave SQL thread sets its Running state to Yes very early in its
initialisation, before the majority of initialisation actions, including
executing the init_slave command, are done. Thus the testcase has a race
condition where the initial replication setup might finish executing later
than the testcase SET GLOBAL init_slave, making the testcase see its effect
where it checks for its absence.
Fix:
===
Include 'sync_slave_sql_with_master.inc' at the beginning of the test to
ensure that slave applier has completed the execution of 'init_slave' command
and proceeded to event application. Replace the apparently needless RESET
MASTER / RESET SLAVE etc.
Patch is based on:
b91e2e6f90
Author: laurynas-biveinis
112 lines
5.3 KiB
Plaintext
112 lines
5.3 KiB
Plaintext
###############################################################################
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# #
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# Variable Name: init_slave #
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# Scope: GLOBAL #
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# Access Type: Dynamic #
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# Data Type: string #
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# Default Value: #
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# Range: #
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# #
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# #
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# Creation Date: 2008-03-08 #
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# Author: Rizwan #
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# Modified: HHunger 2008-09-29 Fixed the bug by inserting the usual wait and #
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# SQL-Satements to control master and slave, #
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# deleted the sleep and made improvements like: #
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# - Replaced the opt file by dynamic variables, #
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# - Made the tests independant of the initial #
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# values of the global variables, #
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# - Reduced the test to the needed test case to #
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# save run time, #
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# - Beautification. #
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# #
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# Description: Test Cases of Dynamic System Variable init_slave #
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# that checks the behavior of this variable #
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# #
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# Reference: #
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# http://dev.mysql.com/doc/refman/5.1/en/server-system-variables.html #
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# #
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###############################################################################
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source include/master-slave.inc;
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# Since a part of slave SQL thread initialisation happens after Slave_SQL_Running
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# has been set to Yes, there is a race condition between initialisation above and
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# init_slave setting given below. Synchronise slave applier with master to ensure
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# init_slave is complete and applier had processed few events like FD.
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--source include/sync_slave_sql_with_master.inc
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--disable_query_log
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call mtr.add_suppression("Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT");
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--enable_query_log
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#
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# save the current values
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SET @start_max_connections= @@global.max_connections;
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SET @start_init_slave= @@global.init_slave;
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# setting of a global value with an effect on the next start of the slave server
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# check that @@global.init_slave could be set
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SET NAMES utf8;
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let $my_init_slave=
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'SET @@global.max_connections = @@global.max_connections + 1 -- комментарий';
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eval SET @@global.init_slave = $my_init_slave;
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# show the data type of the variable
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--disable_warnings
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DROP TABLE IF EXISTS t1;
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CREATE TEMPORARY TABLE t1 AS SELECT @@global.init_slave AS my_column;
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--enable_warnings
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DESCRIBE t1;
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select length(my_column) from t1;
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DROP TABLE t1;
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#
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# check that the new setting of @@global.init_slave becomes immediately visible
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eval SELECT @@global.init_slave = $my_init_slave;
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--echo Expect 1
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# wait for the slave threads have set the global variable.
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let $wait_timeout= 90;
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let $wait_condition= SELECT @@global.max_connections = @start_max_connections;
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--source include/wait_condition_sp.inc
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# check that the action in init_slave does not happen immediately
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--let $assert_text= @@global.max_connections = @start_max_connections
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--let $assert_cond= @@global.max_connections = @start_max_connections
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--source include/assert.inc
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--source include/restart_slave_sql.inc
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# Upon slave start, sync the applier with master, to ensure slave has
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# completed init_slave command execution and processed FD event from the
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# master.
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--connection master
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--source include/sync_slave_sql_with_master.inc
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#
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# wait for the slave threads have set the global variable.
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let $wait_timeout= 90;
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let $wait_condition= SELECT @@global.max_connections = @start_max_connections + 1;
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--source include/wait_condition_sp.inc
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# check that the action in init_slave was executed and had the intended effect
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--let $assert_text= @@global.max_connections = @start_max_connections + 1
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--let $assert_cond= @@global.max_connections = @start_max_connections + 1
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--source include/assert.inc
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#
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# Setting a variable(which is local to a session) and must not be visible
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SET @@global.init_slave = "SET @a=5";
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#
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--source include/restart_slave_sql.inc
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#
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SHOW VARIABLES LIKE 'init_slave';
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# expect NULL
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SELECT @a;
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--echo Expect NULL
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#
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# Clean up
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SET @@global.max_connections= @start_max_connections;
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SET @@global.init_slave= @start_init_slave;
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##################################################
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# End of functionality Testing for init_slave #
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##################################################
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--source include/rpl_end.inc
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