GAL-401: MTR test for the fix.

mysql-test/suite/galera/r/GAL-401.result

+SET GLOBAL wsrep_provider_options = 'pc.ignore_sb=true';
+SET @@global.wsrep_desync = 1;
+SET SESSION wsrep_sync_wait=0;
+SET GLOBAL wsrep_provider_options = 'gmcast.isolate=1';
+CREATE TABLE t1 (f1 INTEGER PRIMARY KEY, f2 CHAR(1));
+SET GLOBAL wsrep_provider_options = 'gmcast.isolate=0';
+SHOW STATUS LIKE 'wsrep_desync_count';
+Variable_name	Value
+wsrep_desync_count	0
+SET @@global.wsrep_desync = 0;
+SET SESSION wsrep_sync_wait=7;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `f1` int(11) NOT NULL,
+  `f2` char(1) DEFAULT NULL,
+  PRIMARY KEY (`f1`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CALL mtr.add_suppression("WSREP: Protocol violation. JOIN message sender (.*) is not in state transfer \\(SYNCED\\). Message ignored.");
+SET GLOBAL wsrep_provider_options = 'pc.ignore_sb=false';

mysql-test/suite/galera/t/GAL-401.test

+# This tests proper desync counter cleanup when DONOR/DESYNC state is cleared.
+
+--source include/galera_cluster.inc
+--source include/have_innodb.inc
+
+# Make node 1 tolerate split-brain
+SET GLOBAL wsrep_provider_options = 'pc.ignore_sb=true';
+
+# Desync and disconnect node 2 from the PC:
+--connection node_2
+SET @@global.wsrep_desync = 1;
+SET SESSION wsrep_sync_wait=0;
+SET GLOBAL wsrep_provider_options = 'gmcast.isolate=1';
+--let $wait_condition = SELECT VARIABLE_VALUE = 'non-Primary' FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_status';
+--source include/wait_condition.inc
+
+# Wait until node 2 disappears from the PC:
+--connection node_1
+--let $wait_condition = SELECT VARIABLE_VALUE = 1 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_size';
+--source include/wait_condition.inc
+--let $wait_condition = SELECT VARIABLE_VALUE = 'Primary' FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_status';
+--source include/wait_condition.inc
+
+# Modify app state to force node 2 into PRIMARY upon reconnection.
+CREATE TABLE t1 (f1 INTEGER PRIMARY KEY, f2 CHAR(1));
+
+# Reconnect node 2 to the PC:
+--connection node_2
+SET GLOBAL wsrep_provider_options = 'gmcast.isolate=0';
+--let $wait_condition = SELECT VARIABLE_VALUE = 'Primary' FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_status';
+--source include/wait_condition.inc
+--let $wait_condition = SELECT VARIABLE_VALUE = 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_size';
+--source include/wait_condition.inc
+
+# Must return 0:
+SHOW STATUS LIKE 'wsrep_desync_count';
+
+# Resync node_2, should pass:
+SET @@global.wsrep_desync = 0;
+
+SET SESSION wsrep_sync_wait=7;
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+CALL mtr.add_suppression("WSREP: Protocol violation. JOIN message sender (.*) is not in state transfer \\(SYNCED\\). Message ignored.");
+
+--connection node_1
+--let $wait_condition = SELECT VARIABLE_VALUE = 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_size';
+--source include/wait_condition.inc
+SET GLOBAL wsrep_provider_options = 'pc.ignore_sb=false';