connection node_2; connection node_1; CREATE TABLE t1 (f1 INTEGER PRIMARY KEY) ENGINE=InnoDB; connect node_2a, 127.0.0.1, root, , test, $NODE_MYPORT_2; SELECT COUNT(*) = 0 FROM t1; COUNT(*) = 0 1 SET SESSION wsrep_sync_wait = 0; SET GLOBAL debug_dbug = '+d,sync.wsrep_apply_cb'; connection node_1; SET SESSION wsrep_trx_fragment_size = 1; SET AUTOCOMMIT=OFF; START TRANSACTION; INSERT INTO t1 VALUES (1); INSERT INTO t1 VALUES (2); INSERT INTO t1 VALUES (3); INSERT INTO t1 VALUES (4); INSERT INTO t1 VALUES (5); connection node_2a; SET SESSION debug_sync = "now WAIT_FOR sync.wsrep_apply_cb_reached"; connection node_2; SET SESSION wsrep_sync_wait = 0; SELECT COUNT(*) = 0 FROM t1; COUNT(*) = 0 1 INSERT INTO t1 VALUES (1);; connection node_1; COMMIT; connection node_2a; SET GLOBAL debug_dbug = ''; SET DEBUG_SYNC = "now SIGNAL signal.wsrep_apply_cb"; connection node_2; Got one of the listed errors ROLLBACK; DROP TABLE t1; connection node_2a; SET DEBUG_SYNC = "RESET";