config root man

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;