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#
# This test tests a potential race condition in MDL locking
#
--source include/galera_cluster.inc
--source include/have_debug.inc
--source include/have_debug_sync.inc
--connection node_1
CREATE TABLE t1 (f1 INTEGER PRIMARY KEY, f2 CHAR(1)) engine=innodb;
CREATE TABLE t2 (f1 INTEGER PRIMARY KEY, f2 CHAR(1)) engine=innodb;
INSERT INTO t1 VALUES (1, 'a');
INSERT INTO t1 VALUES (2, 'a');
SET AUTOCOMMIT=ON;
START TRANSACTION;
UPDATE t1 SET f2 = 'b' WHERE f1 = 1;
# block access to t2
--connect node_1a, 127.0.0.1, root, , test, $NODE_MYPORT_1
--connection node_1a
SET SESSION wsrep_sync_wait=0;
--let $wait_condition = SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = 't2'
--let $wait_condition_on_error_output = SELECT * FROM INFORMATION_SCHEMA.TABLES
--source include/wait_condition_with_debug.inc
LOCK TABLE t2 WRITE;
# Block before MDL lock wait
--connection node_1
SET DEBUG_SYNC= 'wsrep_before_mdl_wait SIGNAL before_mdl_wait WAIT_FOR mdl_wait_continue';
--send SELECT * FROM t2;
--connection node_1a
--echo # Wait until select is blocked before MDL lock wait
SET DEBUG_SYNC= 'now WAIT_FOR before_mdl_wait';
# block applier to wait after BF victim is locked
--connection node_1a
SET @@debug_dbug = "d,sync.wsrep_after_BF_victim_lock";
# Issue a conflicting update on node #2
--connection node_2
UPDATE t1 SET f2 = 'c' WHERE f1 = 1;
--connect node_1b, 127.0.0.1, root, , test, $NODE_MYPORT_1
--connection node_1b
SET SESSION wsrep_sync_wait=0;
--echo # Wait for conflicting update to block
--let $wait_condition = SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE STATE LIKE 'Update_rows_log_event:%';
--source include/wait_condition.inc
# Unblock the SELECT, to enter wsrep_thd_is_BF
SET DEBUG_SYNC = "now SIGNAL signal.wsrep_after_BF_victim_lock";
--connect node_1c, 127.0.0.1, root, , test, $NODE_MYPORT_1
--connection node_1c
--let $wait_condition = SELECT COUNT(*) = 0 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE STATE LIKE 'Update_rows_log_event:%';
--source include/wait_condition.inc
--connection node_1a
# unblock applier to try to BF the SELECT
SET DEBUG_SYNC = "now SIGNAL BF_victim_continue";
# table lock is not needed anymore
UNLOCK TABLES;
# SELECT returns deadlock
--connection node_1
--error ER_LOCK_DEADLOCK
--reap
--connection node_1
SELECT COUNT(*) AS EXPECT_1 FROM t1 WHERE f2 = 'a';
SELECT COUNT(*) AS EXPECT_1 FROM t1 WHERE f2 = 'c';
SELECT * FROM t1;
--connection node_2
SELECT COUNT(*) AS EXPECT_1 FROM t1 WHERE f2 = 'a';
SELECT COUNT(*) AS EXPECT_1 FROM t1 WHERE f2 = 'c';
SELECT * FROM t1;
DROP TABLE t1;
DROP TABLE t2;
--connection node_1a
SET DEBUG_SYNC = "RESET";
--connection node_1b
SET DEBUG_SYNC = "RESET";
--connection node_1
--disconnect node_1a
--disconnect node_1b
--disconnect node_1c
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