connection node_2; connection node_1; CREATE TABLE ten (f1 INTEGER) ENGINE=InnoDB; INSERT INTO ten VALUES (1),(2),(3),(4),(5),(6),(7),(8),(9),(10); CREATE TABLE t1 (f1 INTEGER) ENGINE=InnoDB; INSERT INTO t1 (f1) SELECT (10000 * a1.f1) + (1000 * a2.f1) + (100 * a3.f1) + (10 * a4.f1) + a5.f1 FROM ten AS a1, ten AS a2, ten AS a3, ten AS a4, ten AS a5; INSERT INTO t1 (f1) SELECT MAX(f1) FROM t1; connection node_2; ALTER TABLE t1 ADD PRIMARY KEY (f1); ERROR 23000: Duplicate entry '111110' for key 'PRIMARY' SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `f1` int(11) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci connection node_1; SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `f1` int(11) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci DROP TABLE t1; DROP TABLE ten; CALL mtr.add_suppression("Ignoring error 'Duplicate entry '111110' for key 'PRIMARY'' on query."); connection node_2; CALL mtr.add_suppression("Ignoring error 'Duplicate entry '111110' for key 'PRIMARY'' on query.");