connection node_2; connection node_1; connection node_1; CREATE TABLE t1 (f1 INTEGER PRIMARY KEY) ENGINE=InnoDB; CREATE TABLE t2 (f1 INTEGER) ENGINE=InnoDB; INSERT INTO t2 VALUES (6),(7),(8),(9),(10),(1); connection node_2; SET GLOBAL wsrep_slave_threads = 2; 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), (2), (3), (4), (5); connect node_1a, 127.0.0.1, root, , test, $NODE_MYPORT_1; connection node_1a; SET AUTOCOMMIT=OFF; START TRANSACTION; INSERT INTO t1 VALUES (1), (2), (3), (4), (5);; connection node_1; INSERT INTO t1 SELECT * FROM t2;; connection node_1a; INSERT INTO t1 VALUES (6), (7), (8), (9), (10); COMMIT; connection node_1; Got one of the listed errors connection node_2; SET GLOBAL wsrep_slave_threads = 1; SET GLOBAL debug_dbug = ''; SET DEBUG_SYNC='now SIGNAL signal.wsrep_apply_cb'; SET DEBUG_SYNC='now SIGNAL signal.wsrep_apply_cb'; SET DEBUG_SYNC='now SIGNAL signal.wsrep_apply_cb'; SET DEBUG_SYNC='now SIGNAL signal.wsrep_apply_cb'; SELECT COUNT(*) = 10 FROM t1; COUNT(*) = 10 1 DROP TABLE t1; DROP TABLE t2; SET DEBUG_SYNC = RESET;