connection node_2;
connection node_1;
connection node_1;
CREATE TABLE t1 (f1 INTEGER) Engine=InnoDB;
INSERT INTO t1 (f1) VALUES (1), (2), (3);
connection node_2;
SET GLOBAL wsrep_desync = TRUE;
SET wsrep_on = FALSE;
SET SESSION debug_sync = "alter_table_inplace_after_lock_upgrade SIGNAL mdl_locked WAIT_FOR mdl_continue";
ALTER TABLE t1 ADD PRIMARY KEY (f1);;
connect node_2a, 127.0.0.1, root, , test, $NODE_MYPORT_2;
connection node_2a;
SET SESSION debug_sync = "now WAIT_FOR mdl_locked";
connection node_1;
INSERT INTO t1(f1) VALUES (11);
connection node_2a;
SET debug_sync = "now SIGNAL mdl_continue";
SET debug_sync='RESET';
connection node_2;
ERROR 70100: Query execution was interrupted
SET wsrep_on = TRUE;
SET GLOBAL wsrep_desync = FALSE;
connection node_1;
DROP TABLE t1;