###############################################################################
#                                                                             #
# Variable Name: init_slave                                                   #
# Scope: GLOBAL                                                               #
# Access Type: Dynamic                                                        #
# Data Type: string                                                           #
# Default Value:                                                              #
# Range:                                                                      #
#                                                                             #
#                                                                             #
# Creation Date: 2008-03-08                                                   #
# Author:  Rizwan                                                             #
# Modified: HHunger 2008-09-29 Fixed the bug by inserting the usual wait and  #
#                              SQL-Satements to control master and slave,     #
#                              deleted the sleep and made improvements like:  #
#                              - Replaced the opt file by dynamic variables,  #
#                              - Made the tests independent of the initial    #
#                                values of the global variables,              #
#                              - Reduced the test to the needed test case to  #
#                                save run time,                               #
#                              - Beautification.                              #
#                                                                             #
# Description: Test Cases of Dynamic System Variable init_slave               #
#              that checks the behavior of this variable                      #
#                                                                             #
# Reference:                                                                  #
# http://dev.mysql.com/doc/refman/5.1/en/server-system-variables.html         #
#                                                                             #
###############################################################################

source include/master-slave.inc;

# Since a part of slave SQL thread initialisation happens after Slave_SQL_Running
# has been set to Yes, there is a race condition between initialisation above and
# init_slave setting given below. Synchronise slave applier with master to ensure
# init_slave is complete and applier had processed few events like FD.
--source include/sync_slave_sql_with_master.inc

--disable_query_log
call mtr.add_suppression("Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT");
--enable_query_log
#
# save the current values

SET @start_max_connections= @@global.max_connections;
SET @start_init_slave= @@global.init_slave;

# setting of a global value with an effect on the next start of the slave server
# check that @@global.init_slave could be set
SET NAMES utf8;
let $my_init_slave=
   'SET @@global.max_connections = @@global.max_connections + 1 -- комментарий';
eval SET @@global.init_slave = $my_init_slave;

# show the data type of the variable
--disable_warnings
DROP TABLE IF EXISTS t1;
CREATE TEMPORARY TABLE t1 AS SELECT @@global.init_slave AS my_column;
--enable_warnings
DESCRIBE t1;
select length(my_column) from t1;
DROP TABLE t1;
#
# check that the new setting of @@global.init_slave becomes immediately visible
eval SELECT @@global.init_slave = $my_init_slave;
--echo Expect 1
# wait for the slave threads have set the global variable.
let $wait_timeout= 90;
let $wait_condition= SELECT @@global.max_connections = @start_max_connections;
--source include/wait_condition_sp.inc
# check that the action in init_slave does not happen immediately
--let $assert_text= @@global.max_connections = @start_max_connections
--let $assert_cond= @@global.max_connections = @start_max_connections
--source include/assert.inc

--source include/restart_slave_sql.inc

# Upon slave start, sync the applier with master, to ensure slave has
# completed init_slave command execution and processed FD event from the
# master.
--connection master
--source include/sync_slave_sql_with_master.inc

#
# wait for the slave threads have set the global variable.
let $wait_timeout= 90;
let $wait_condition= SELECT @@global.max_connections = @start_max_connections + 1;
--source include/wait_condition_sp.inc
# check that the action in init_slave was executed and had the intended effect
--let $assert_text= @@global.max_connections = @start_max_connections + 1
--let $assert_cond= @@global.max_connections = @start_max_connections + 1
--source include/assert.inc
#
# Setting a variable(which is local to a session) and must not be visible
SET @@global.init_slave = "SET @a=5";
#
--source include/restart_slave_sql.inc
#
SHOW VARIABLES LIKE 'init_slave';
# expect NULL
SELECT @a;
--echo Expect NULL
#
# Clean up
SET @@global.max_connections= @start_max_connections;
SET @@global.init_slave= @start_init_slave;
##################################################
# End of functionality Testing for init_slave    #
##################################################

--source include/rpl_end.inc