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#
# 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`
--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 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
--let $wait_condition = SELECT COUNT(*) = @@wsrep_slave_threads + 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user' AND (STATE IS NULL OR STATE NOT LIKE 'InnoDB%');
--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
# Generate 64 replication events
--let $count = 64
while ($count)
{
INSERT INTO t2 VALUES (DEFAULT);
--dec $count
}
--connection node_2
SELECT COUNT(*) FROM t2;
--let $wait_condition = SELECT COUNT(*) = @@wsrep_slave_threads + 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user' AND (STATE IS NULL OR STATE NOT LIKE 'InnoDB%')
--source include/wait_condition.inc
SELECT COUNT(*) FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user' AND STATE LIKE '%wsrep aborter%';
--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 COUNT(*) = @@wsrep_slave_threads + 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user' AND (STATE IS NULL OR STATE NOT LIKE 'InnoDB%')
--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);
DROP TABLE t1;
--connection node_2
#
# make sure that we are left with exactly one applier thread before we leaving the test
#
--let $wait_condition = SELECT COUNT(*) = 2 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user' AND (STATE IS NULL OR STATE NOT LIKE 'InnoDB%')
--source include/wait_condition.inc
SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user' AND STATE LIKE '%wsrep aborter%';
--echo # End of tests
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