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