connection node_2; connection node_1; connect node_1a, 127.0.0.1, root, , test, $NODE_MYPORT_1; connect node_1b, 127.0.0.1, root, , test, $NODE_MYPORT_1; connect node_1c, 127.0.0.1, root, , test, $NODE_MYPORT_1; connection node_1; CREATE TABLE t1 (f1 INTEGER PRIMARY KEY, f2 VARCHAR(1)) ENGINE=InnoDB; INSERT INTO t1 VALUES (1, 'x'), (2, 'x'), (4, 'x'), (5, 'x'); connection node_1a; START TRANSACTION; UPDATE t1 SET f2 = 'a' WHERE f1 = 1; UPDATE t1 SET f2 = 'a' WHERE f1 = 4; UPDATE t1 SET f2 = 'a' WHERE f1 = 5; connection node_1b; START TRANSACTION; SET SESSION wsrep_trx_fragment_size = 1; INSERT INTO t1 VALUES (3, 'b'); UPDATE t1 SET f2 = 'b' WHERE f1 = 2; connection node_2; SELECT * FROM t1; f1 f2 1 x 2 x 4 x 5 x connection node_1c; SET AUTOCOMMIT=ON; INSERT INTO t1 VALUES (3, 'c'); connection node_2; SELECT * FROM t1; f1 f2 1 x 2 x 4 x 5 x connection node_1a; UPDATE t1 SET f2 = 'a' WHERE f1 = 2; connection node_1b; SET DEBUG_SYNC = 'wsrep_before_SR_rollback SIGNAL wait WAIT_FOR continue'; UPDATE t1 SET f2 = 'b' WHERE f1 = 1; connection node_1; SET DEBUG_SYNC = 'now WAIT_FOR wait'; connection node_1; SET DEBUG_SYNC = 'now SIGNAL continue'; connection node_1c; UPDATE t1 SET f2 = 'x' WHERE f1 = 3; connection node_1a; COMMIT; connection node_1b; ERROR 40001: Deadlock found when trying to get lock; try restarting transaction connection node_1; SELECT * FROM t1; f1 f2 1 a 2 a 3 x 4 a 5 a connection node_2; SELECT * FROM t1;