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#
# BF-BF conflict on MDL locks between: DROP TABLE t2 and UPDATE on t1
# with t2 referencing t1
#
--source include/galera_cluster.inc
--source include/have_debug_sync.inc
#
# Setup
#
--connection node_2
SET GLOBAL wsrep_slave_threads=2;
CREATE TABLE t1 (
id INTEGER PRIMARY KEY,
f2 INTEGER);
CREATE TABLE t2 (
f1 INT PRIMARY KEY,
t1_id INT NOT NULL,
f2 INTEGER NOT NULL,
KEY key_t1_id(t1_id),
CONSTRAINT key_t1_id FOREIGN KEY (t1_id) REFERENCES t1 (id) ON UPDATE CASCADE ON DELETE CASCADE);
INSERT INTO t1 VALUES (1,0);
INSERT INTO t1 VALUES (2,0);
INSERT INTO t2 VALUES (1,1,1234);
INSERT INTO t2 VALUES (2,2,1234);
#
# DROP TABLE t2 and wait for it to reach node_2
#
--connection node_2
SET GLOBAL DEBUG_DBUG = "d,sync.wsrep_apply_toi";
--connection node_1
DROP TABLE t2;
--connection node_2
SET DEBUG_SYNC = "now WAIT_FOR sync.wsrep_apply_toi_reached";
SET SESSION wsrep_sync_wait = 0;
--let $expected_apply_waits = `SELECT VARIABLE_VALUE+1 FROM information_schema.global_status WHERE VARIABLE_NAME = 'wsrep_apply_waits'`
--echo $expected_apply_waits
#
# Issue a UPDATE to table that references t1
# Notice that we update field f2, not the primary key,
# and not foreign key. Bug does not manifest if we update
# one of those fields (because FK keys appended in those cases).
#
--connection node_1
UPDATE t1 SET f2 = 1 WHERE id=2;
#
# Expect the UPDATE to depend on the DROP,
# therefore it should wait for the DROP to
# finish before it can be applied.
# If bug is present, expect the wait condition
# to timeout and when the UPDATE applies, it
# will be granted a MDL lock of type SHARED_READ
# for table t1. When resumed, the DROP TABLE will
# also try to MDL lock t1, causing a BF-BF conflict
# on that MDL lock.
#
--connection node_2
--let $wait_condition = SELECT VARIABLE_VALUE = $expected_apply_waits FROM information_schema.global_status WHERE VARIABLE_NAME = 'wsrep_apply_waits'
--source include/wait_condition.inc
SET DEBUG_SYNC = "now SIGNAL signal.wsrep_apply_toi";
SET SESSION wsrep_sync_wait = DEFAULT;
SELECT * FROM t1;
#
# Cleanup
#
SET DEBUG_SYNC = 'RESET';
SET GLOBAL DEBUG_DBUG = '';
SET GLOBAL wsrep_slave_threads = DEFAULT;
DROP TABLE t1;
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