connection node_2;
connection node_1;
CREATE TABLE t1 (id INT PRIMARY KEY) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1);
connection node_2;
FLUSH TABLE WITH READ LOCK;
### This shouldn't block.
FLUSH TABLES t1 FOR EXPORT;
connection node_1;
ALTER TABLE t1 ADD COLUMN f2 INTEGER;
connection node_2;
UNLOCK TABLES;
### t1 should have column f2
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `id` int(11) NOT NULL,
  `f2` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
connection node_1;
INSERT INTO t1 VALUES (2,3);
connection node_2;
SELECT * from t1;
id	f2
1	NULL
2	3
connection node_1;
DROP TABLE t1;