1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
--source include/galera_cluster.inc
--source include/have_debug_sync.inc
--connection node_1
CREATE TABLE t1 (f1 INTEGER PRIMARY KEY, f2 CHAR(255)) Engine=InnoDB;
DELIMITER |;
CREATE PROCEDURE insert_proc ()
BEGIN
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION
BEGIN
GET DIAGNOSTICS CONDITION 1 @errno = MYSQL_ERRNO;
END;
INSERT INTO t1 VALUES (1, 'node 1'),(2, 'node 1');
INSERT INTO t1 VALUES (3, 'node 1');
END|
DELIMITER ;|
# We need two slave threads here to guarantee progress.
# If we use only one thread the following could happen
# in node_1:
# We block the only slave thread in wsrep_apply_cb and we
# issue an INSERT (by calling the stored procedure) that will
# try to acquire galera's local monitor in pre_commit().
# This usually works fine, except for when a commit cut event
# sneaks in the slave queue and gets a local seqno smaller than
# that of the INSERT. Because there is only one slave thread,
# commit cut is not processed and therefore does not advance
# local monitor, and our INSERT remains stuck there.
SET GLOBAL wsrep_slave_threads = 2;
SET GLOBAL DEBUG_DBUG = "d,sync.wsrep_apply_cb";
--connection node_2
--send INSERT INTO t1 VALUES (1, 'node 2');
--connect node_1a, 127.0.0.1, root, , test, $NODE_MYPORT_1
--connection node_1a
SET SESSION DEBUG_SYNC = "now WAIT_FOR sync.wsrep_apply_cb_reached";
--connection node_1
SET SESSION wsrep_sync_wait = 0;
SET SESSION DEBUG_SYNC = 'wsrep_after_certification SIGNAL wsrep_after_certification_reached WAIT_FOR wsrep_after_certification_continue';
--send CALL insert_proc ();
--connection node_1a
SET SESSION DEBUG_SYNC = "now WAIT_FOR wsrep_after_certification_reached";
SET GLOBAL DEBUG_DBUG = "";
SET DEBUG_SYNC = "now SIGNAL wsrep_after_replication_continue";
SET DEBUG_SYNC = "now SIGNAL signal.wsrep_apply_cb";
--connection node_2
--reap
--connection node_1
# We expect no errors here, because the handler in insert_proc() caught the deadlock error
--reap
SELECT @errno = 1213;
SELECT * FROM t1;
--connection node_2
SELECT * FROM t1;
--connection node_1
SET GLOBAL wsrep_slave_threads = DEFAULT;
DROP TABLE t1;
DROP PROCEDURE insert_proc;
SET GLOBAL debug_dbug = NULL;
SET debug_sync='RESET';
# Make sure no pending signals are leftover to surprise subsequent tests.
SELECT @@debug_sync;
|
