Merge pull request #663 from codership/MDEV-13549-fixes-for-galera_var_slave_threads

MDEV-13549 Fix and re-enable test galera.galera_var_slave_threads

mysql-test/suite/galera/disabled.def

@@ -18,7 +18,6 @@ galera_binlog_rows_query_log_events: MariaDB does not support binlog_rows_query_
 GAL-419 : MDEV-13549 Galera test failures
 galera_toi_ddl_fk_insert : MDEV-13549 Galera test failures
 galera_var_notify_cmd : MDEV-13549 Galera test failures
-galera_var_slave_threads : MDEV-13549 Galera test failures
 mysql-wsrep#90 : MDEV-13549 Galera test failures
 galera_as_master_gtid : Requires MySQL GTID
 galera_as_master_gtid_change_master : Requires MySQL GTID

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

-CALL mtr.add_suppression("WSREP: Refusing exit for the last slave thread.");
 CREATE TABLE t1 (f1 INT PRIMARY KEY) Engine=InnoDB;
 CREATE TABLE t2 (f1 INT AUTO_INCREMENT PRIMARY KEY) Engine=InnoDB;
+CALL mtr.add_suppression("WSREP: Refusing exit for the last slave thread.");
 SET GLOBAL wsrep_slave_threads = 0;
 Warnings:
 Warning	1292	Truncated incorrect wsrep_slave_threads value: '0'
@@ -22,9 +22,6 @@ INSERT INTO t1 VALUES (1);
 SELECT COUNT(*) = 1 FROM t1;
 COUNT(*) = 1
 1
-SELECT COUNT(*) = @@wsrep_slave_threads + 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user';
-COUNT(*) = @@wsrep_slave_threads + 1
-1
 SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user' AND STATE LIKE '%wsrep aborter%';
 COUNT(*) = 1
 1
@@ -96,9 +93,6 @@ INSERT INTO t2 VALUES (DEFAULT);
 SELECT COUNT(*) = 64 FROM t2;
 COUNT(*) = 64
 1
-SELECT COUNT(*) = @@wsrep_slave_threads + 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user';
-COUNT(*) = @@wsrep_slave_threads + 1
-1
 SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user' AND STATE LIKE '%wsrep aborter%';
 COUNT(*) = 1
 1
@@ -111,5 +105,11 @@ DROP TABLE t2;
 CREATE TABLE t1 (i INT AUTO_INCREMENT PRIMARY KEY) ENGINE=INNODB;
 SET GLOBAL wsrep_slave_threads = 4;
 SET GLOBAL wsrep_slave_threads = 1;
+INSERT INTO t1 VALUES (DEFAULT);
+INSERT INTO t1 VALUES (DEFAULT);
+INSERT INTO t1 VALUES (DEFAULT);
 DROP TABLE t1;
+SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user' AND STATE LIKE '%wsrep aborter%';
+COUNT(*) = 1
+1
 # End of tests

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

@@ -6,7 +6,6 @@
 
 --source include/galera_cluster.inc
 --source include/have_innodb.inc
-CALL mtr.add_suppression("WSREP: Refusing exit for the last slave thread.");
 --let $wsrep_slave_threads_orig = `SELECT @@wsrep_slave_threads`
 
 --connection node_1
@@ -14,7 +13,7 @@ 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;
@@ -30,15 +29,14 @@ SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system use
 #
 
 SET GLOBAL wsrep_slave_threads = 64;
---sleep 0.5
 
 --connection node_1
 INSERT INTO t1 VALUES (1);
 
 --connection node_2
 SELECT COUNT(*) = 1 FROM t1;
-
-SELECT COUNT(*) = @@wsrep_slave_threads + 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user';
+--let $wait_condition = SELECT COUNT(*) = @@wsrep_slave_threads + 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user';
+--source include/wait_condition.inc
 SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user' AND STATE LIKE '%wsrep aborter%';
 
 #
@@ -59,8 +57,8 @@ while ($count)
 
 --connection node_2
 SELECT COUNT(*) = 64 FROM t2;
-
-SELECT COUNT(*) = @@wsrep_slave_threads + 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user';
+--let $wait_condition = SELECT COUNT(*) = @@wsrep_slave_threads + 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user';
+--source include/wait_condition.inc
 SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user' AND STATE LIKE '%wsrep aborter%';
 
 
@@ -78,7 +76,23 @@ 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'
+--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'
+--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