#
# 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
--source include/force_restart.inc

# 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
--let $wsrep_slave_threads_orig = `SELECT @@wsrep_slave_threads`
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 STATE LIKE '%wsrep aborter%';

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

--connection node_2

--let $wait_timeout=600
--let $wait_condition = SELECT COUNT(*) = 1 FROM t1;
--source include/wait_condition.inc

SELECT COUNT(*) FROM t1;

#
# Increase the number of slave threads. The change takes effect immediately
#
SET GLOBAL wsrep_slave_threads = 64;

--let $wait_condition = SELECT VARIABLE_VALUE = 64 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_applier_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 70 replication events
--let $count = 70
while ($count)
{
  INSERT INTO t2 VALUES (DEFAULT);
  --dec $count
}
--enable_query_log
--enable_result_log

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

--let $wait_condition = SELECT VARIABLE_VALUE = 1 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_applier_thread_count';
--source include/wait_condition.inc

--eval SET GLOBAL wsrep_slave_threads = $wsrep_slave_threads_orig

DROP TABLE t1;
DROP TABLE t2;

--echo #
--echo # lp:1372840 - Changing wsrep_slave_threads causes future connections to hang
--echo #

--connection node_1
CREATE TABLE t1 (i INT AUTO_INCREMENT PRIMARY KEY) ENGINE=INNODB;

--connection node_2
SET GLOBAL wsrep_slave_threads = 4;
--let $wait_condition = SELECT VARIABLE_VALUE = 4 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_applier_thread_count';
--source include/wait_condition.inc

SET GLOBAL wsrep_slave_threads = 1;

--connection node_1
INSERT INTO t1 VALUES (DEFAULT);
INSERT INTO t1 VALUES (DEFAULT);
INSERT INTO t1 VALUES (DEFAULT);
INSERT INTO t1 VALUES (DEFAULT);
INSERT INTO t1 VALUES (DEFAULT);
INSERT INTO t1 VALUES (DEFAULT);
INSERT INTO t1 VALUES (DEFAULT);
INSERT INTO t1 VALUES (DEFAULT);
DROP TABLE t1;

--connection node_2

# Wait until above DDL is replicated
#
# make sure that we are left with exactly one applier thread before we leaving the test
#
--let $wait_condition = SELECT VARIABLE_VALUE = 1 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_applier_thread_count';
--source include/wait_condition.inc

SELECT NAME FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES WHERE NAME LIKE 'test/t%';

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

--echo # End of tests