mariadb/mysql-test/suite/galera/t/galera_var_slave_threads.test

#
# This tests the very basic operations around wsrep-slave-threads
# More complex scenarios will be tested separately in the context of
# parallel replication
#

--source include/galera_cluster.inc
--source include/have_innodb.inc
--let $wsrep_slave_threads_orig = `SELECT @@wsrep_slave_threads`

# Save original auto_increment_offset values.
--let $node_1=node_1
--let $node_2=node_2
--source include/auto_increment_offset_save.inc

--connection node_1
CREATE TABLE t1 (f1 INT PRIMARY KEY) Engine=InnoDB;
CREATE TABLE t2 (f1 INT AUTO_INCREMENT PRIMARY KEY) Engine=InnoDB;

--connection node_2
CALL mtr.add_suppression("WSREP: Refusing exit for the last slave thread.");
# Setting wsrep_slave_threads to zero triggers a warning
SET GLOBAL wsrep_slave_threads = 0;
SHOW WARNINGS;
SELECT @@wsrep_slave_threads = 1;

SET GLOBAL wsrep_slave_threads = 1;
# There is a separate wsrep_aborter thread at all times
SELECT COUNT(*) FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user' AND COMMAND != 'Daemon';
SELECT COUNT(*) FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user' AND STATE LIKE '%wsrep aborter%';

#
# Increase the number of slave threads. The change takes effect immediately
#

SET GLOBAL wsrep_slave_threads = 64;

--connection node_1
INSERT INTO t1 VALUES (1);

--connection node_2
SELECT COUNT(*) FROM t1;

#
# note, in wsrep API #26, we have 2 rollbacker threads, counted as system user's
#

SELECT COUNT(*) FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user' AND STATE LIKE '%wsrep aborter%';

--let $wait_condition = SELECT VARIABLE_VALUE = @@wsrep_slave_threads + 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_thread_count';
--source include/wait_condition.inc

#
# Reduce the number of slave threads. The change is not immediate -- a thread will only exit after a replication event
#

SET GLOBAL wsrep_slave_threads = 1;

--connection node_1

--disable_result_log
--disable_query_log
# Generate 64 replication events
--let $count = 64
while ($count)
{
  INSERT INTO t2 VALUES (DEFAULT);
  --dec $count
}
--enable_query_log
--enable_result_log

--connection node_2
SELECT COUNT(*) FROM t2;

SELECT COUNT(*) FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user' AND STATE LIKE '%wsrep aborter%';

--let $wait_condition = SELECT VARIABLE_VALUE = @@wsrep_slave_threads + 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_thread_count';
--source include/wait_condition.inc

--let $wsrep_cluster_address_node2 = `SELECT @@wsrep_cluster_address`
--let $wsrep_provider_node2 = `SELECT @@wsrep_provider`

SET GLOBAL wsrep_slave_threads = 5;

--let $wait_condition = SELECT VARIABLE_VALUE = @@wsrep_slave_threads + 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_thread_count';
--source include/wait_condition.inc

SET GLOBAL wsrep_slave_threads = 1;

#
# test phase for bug https://github.com/codership/mysql-wsrep/issues/319
#

# shutdown node 2
--connection node_2
--echo Shutting down server ...
--source include/shutdown_mysqld.inc

# wait until node_1 is ready as one node cluster
--connection node_1

--let $wait_condition = SELECT VARIABLE_VALUE = @@wsrep_slave_threads + 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_thread_count';
--source include/wait_condition.inc
show status like 'wsrep_cluster_size';

# step up slave threads to 6, and make sure all appliers and rollbacker thread are running
SET GLOBAL wsrep_slave_threads = 6;
--let $wait_condition = SELECT VARIABLE_VALUE = @@wsrep_slave_threads + 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_thread_count';
--source include/wait_condition.inc

# change to invalid cluster address
SET GLOBAL wsrep_slave_threads = 1;
SET GLOBAL wsrep_cluster_address='';

# join back to single node cluster
SET GLOBAL wsrep_cluster_address='gcomm://';
--source include/wait_until_connected_again.inc

# we should have 1 applier thread now
--let $wait_condition = SELECT COUNT(*) = @@wsrep_slave_threads + 2 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user' AND COMMAND != 'Daemon'
--source include/wait_condition.inc

# test if we can increase applier count now (fails in bug #319)
SET GLOBAL wsrep_slave_threads = 10;
--let $wait_condition = SELECT VARIABLE_VALUE = @@wsrep_slave_threads + 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_thread_count';
--source include/wait_condition.inc

# restart node 2
--connection node_2
--source include/start_mysqld.inc
--source include/wait_until_connected_again.inc

SELECT COUNT(*) FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user' AND COMMAND != 'Daemon';

# 
#
# cleanup to original state
#
--connection node_1
--eval SET GLOBAL wsrep_slave_threads = $wsrep_slave_threads_orig

--connection node_2
--eval SET GLOBAL wsrep_slave_threads = $wsrep_slave_threads_orig


--disable_result_log
--disable_query_log
# Generate 64 replication events, to help node 1 to purge excessive applier threads
--let $count = 64
while ($count)
{
  INSERT INTO t2 VALUES (DEFAULT);
  --dec $count
}
--enable_query_log
--enable_result_log

--connection node_1
--disable_result_log
--disable_query_log
# Generate 64 replication events, to help node 2 to purge excessive applier threads
--let $count = 64
while ($count)
{
  INSERT INTO t2 VALUES (DEFAULT);
  --dec $count
}
--enable_query_log
--enable_result_log

--let $wait_condition = SELECT VARIABLE_VALUE = @@wsrep_slave_threads + 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_thread_count';
--source include/wait_condition.inc


--connection node_2
--let $wait_condition = SELECT VARIABLE_VALUE = @@wsrep_slave_threads + 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_thread_count';
--source include/wait_condition.inc

SELECT COUNT(*) FROM t1;
SELECT COUNT(*) FROM t2;

--connection node_1

SELECT COUNT(*) FROM t1;
SELECT COUNT(*) FROM t2;

DROP TABLE t1;
DROP TABLE t2;

# Restore original auto_increment_offset values.
--source include/auto_increment_offset_restore.inc

--echo # End of tests