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drop table if exists t1; # # Test that alter during lock table aborts with error if # global schema lock already exists # create table t1 (a int key) engine ndb row_format dynamic; set session debug="+d,sleep_after_global_schema_lock"; alter table t1 add column (b int); lock tables t1 write; alter table t1 add column (c int); ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction alter table t1 add column (c int); ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction alter table t1 add column (c int); ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction unlock tables; # # Test that alter during lock works without global schema lock # and that an alter done in parallell test serialized # lock tables t1 write; # delay is still set after lock alter table t1 add column (c int); # issue alter in parallell, which should be hanging waiting on alter table t1 add column (d int); # check thread state which should be: # "Waiting for allowed to take ndbcluster global schema lock" # _not_ "Waiting for ndbcluster global schema lock" select state from information_schema.processlist where info = "alter table t1 add column (d int)"; state Waiting for allowed to take ndbcluster global schema lock unlock tables; show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) NOT NULL, `b` int(11) DEFAULT NULL, `c` int(11) DEFAULT NULL, `d` int(11) DEFAULT NULL, PRIMARY KEY (`a`) ) ENGINE=ndbcluster DEFAULT CHARSET=latin1 ROW_FORMAT=DYNAMIC # Cleanup set session debug="-d,"; drop table t1;