Galera MTR tests: MW-246 codership/mysql-wsrep#247 Additional tests around RSU and wsrep_desync

mysql-test/suite/galera/r/galera_rsu_wsrep_desync.result

+CREATE TABLE t1 (f1 INTEGER) Engine=InnoDB;
+SET GLOBAL wsrep_desync=1;
+SET wsrep_OSU_method=RSU;
+SET DEBUG_SYNC = 'alter_table_before_open_tables WAIT_FOR continue';
+ALTER TABLE t1 ADD COLUMN f2 INTEGER;;
+SET GLOBAL wsrep_desync=0;
+SET DEBUG_SYNC= 'now SIGNAL continue';
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `f1` int(11) DEFAULT NULL,
+  `f2` int(11) DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+SHOW VARIABLES LIKE 'wsrep_desync';
+Variable_name	Value
+wsrep_desync	OFF
+SET wsrep_OSU_method=TOI;
+DROP TABLE t1;
+CREATE TABLE t1 (f1 INTEGER) Engine=InnoDB;
+SET GLOBAL wsrep_desync=0;
+Warnings:
+Warning	1231	'wsrep_desync' is already OFF.
+SET wsrep_OSU_method=RSU;
+SET DEBUG_SYNC = 'alter_table_before_open_tables WAIT_FOR continue';
+ALTER TABLE t1 ADD COLUMN f2 INTEGER;;
+SET GLOBAL wsrep_desync=1;
+ERROR HY000: Operation 'desync' failed for SET GLOBAL wsrep_desync=1
+SET GLOBAL wsrep_desync=0;
+SET DEBUG_SYNC= 'now SIGNAL continue';
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `f1` int(11) DEFAULT NULL,
+  `f2` int(11) DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+SET wsrep_OSU_method=TOI;
+DROP TABLE t1;
+CALL mtr.add_suppression("Protocol violation");
+CALL mtr.add_suppression("desync failed");
+CALL mtr.add_suppression("Protocol violation");

mysql-test/suite/galera/t/galera_rsu_wsrep_desync.test

+#
+# Test manipulating wsrep_desync while an RSU operation is in progress
+#
+
+--source include/galera_cluster.inc
+--source include/have_innodb.inc
+--source include/have_debug_sync.inc
+
+# First, test wsrep_desync 1 > 0 during DDL
+
+--connection node_1
+CREATE TABLE t1 (f1 INTEGER) Engine=InnoDB;
+
+SET GLOBAL wsrep_desync=1;
+SET wsrep_OSU_method=RSU;
+
+SET DEBUG_SYNC = 'alter_table_before_open_tables WAIT_FOR continue';
+--send ALTER TABLE t1 ADD COLUMN f2 INTEGER;
+
+--connect node_1a, 127.0.0.1, root, , test, $NODE_MYPORT_1
+--connection node_1a
+
+--let $wait_condition = SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE STATE = 'debug sync point: alter_table_before_open_tables'
+--source include/wait_condition.inc
+
+SET GLOBAL wsrep_desync=0;
+SET DEBUG_SYNC= 'now SIGNAL continue';
+
+--connection node_1
+--reap
+
+SHOW CREATE TABLE t1;
+SHOW VARIABLES LIKE 'wsrep_desync';
+SET wsrep_OSU_method=TOI;
+
+DROP TABLE t1;
+
+# Next, test wsrep_desync 0 > 1 during DDL, currently not allowed
+
+--connection node_1
+CREATE TABLE t1 (f1 INTEGER) Engine=InnoDB;
+
+SET GLOBAL wsrep_desync=0;
+SET wsrep_OSU_method=RSU;
+
+SET DEBUG_SYNC = 'alter_table_before_open_tables WAIT_FOR continue';
+--send ALTER TABLE t1 ADD COLUMN f2 INTEGER;
+
+--connection node_1a
+
+--let $wait_condition = SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE STATE = 'debug sync point: alter_table_before_open_tables'
+--source include/wait_condition.inc
+
+# This transition is currently not allowed
+--error ER_CANNOT_USER
+SET GLOBAL wsrep_desync=1;
+SET GLOBAL wsrep_desync=0;
+
+SET DEBUG_SYNC= 'now SIGNAL continue';
+
+--connection node_1
+--reap
+
+SHOW CREATE TABLE t1;
+SET wsrep_OSU_method=TOI;
+DROP TABLE t1;
+
+CALL mtr.add_suppression("Protocol violation");
+CALL mtr.add_suppression("desync failed");
+
+--connection node_2
+CALL mtr.add_suppression("Protocol violation");
+
+