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mariadb/mysql-test/t/mdl_sync.test
Dmitry Lenev fc2c669297 Fix for bug#14188793 - "DEADLOCK CAUSED BY ALTER TABLE DOEN'T CLEAR 
STATUS OF ROLLBACKED TRANSACTION" and bug #17054007 - "TRANSACTION
IS NOT FULLY ROLLED BACK IN CASE OF INNODB DEADLOCK".

The problem in the first bug report was that although deadlock involving
metadata locks was reported using the same error code and message as InnoDB
deadlock it didn't rollback transaction like the latter. This caused
confusion to users as in some cases after ER_LOCK_DEADLOCK transaction
could have been restarted immediately and in some cases rollback was
required.

The problem in the second bug report was that although InnoDB deadlock
caused transaction rollback in all storage engines it didn't cause release
of metadata locks. So concurrent DDL on the tables used in transaction was
blocked until implicit or explicit COMMIT or ROLLBACK was issued in the
connection which got InnoDB deadlock.

The former issue has stemmed from the fact that when support for detection
and reporting metadata locks deadlocks was added we erroneously assumed
that InnoDB doesn't rollback transaction on deadlock but only last statement
(while this is what happens on InnoDB lock timeout actually) and so didn't
implement rollback of transactions on MDL deadlocks.

The latter issue was caused by the fact that rollback of transaction due
to deadlock is carried out by setting THD::transaction_rollback_request
flag at the point where deadlock is detected and performing rollback
inside of trans_rollback_stmt() call when this flag is set. And
trans_rollback_stmt() is not aware of MDL locks, so no MDL locks are
released.

This patch solves these two problems in the following way:

- In case when MDL deadlock is detect transaction rollback is requested
  by setting THD::transaction_rollback_request flag.

- Code performing rollback of transaction if THD::transaction_rollback_request
  is moved out from trans_rollback_stmt(). Now we handle rollback request
  on the same level as we call trans_rollback_stmt() and release statement/
  transaction MDL locks.
2013-08-20 13:12:34 +04:00

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#
# We need the Debug Sync Facility.
#
--source include/have_debug_sync.inc
# We need InnoDB tables for some of the tests.
--source include/have_innodb.inc
# Save the initial number of concurrent sessions.
--source include/count_sessions.inc
# Clean up resources used in this test case.
--disable_warnings
SET DEBUG_SYNC= 'RESET';
--enable_warnings
#
# Test the case of when a exclusive lock request waits for a
# shared lock being upgraded to a exclusive lock.
#
connect (con1,localhost,root,,test,,);
connect (con2,localhost,root,,test,,);
connect (con3,localhost,root,,test,,);
connection default;
--disable_warnings
drop table if exists t1,t2,t3;
--enable_warnings
create table t1 (i int);
create table t2 (i int);
--echo connection: default
lock tables t2 read;
connection con1;
--echo connection: con1
set debug_sync='mdl_upgrade_shared_lock_to_exclusive SIGNAL parked WAIT_FOR go';
--send alter table t1 rename t3
connection default;
--echo connection: default
set debug_sync= 'now WAIT_FOR parked';
connection con2;
--echo connection: con2
set debug_sync='mdl_acquire_lock_wait SIGNAL go';
--send drop table t1,t2
connection con1;
--echo connection: con1
--reap
connection default;
--echo connection: default
unlock tables;
connection con2;
--echo connection: con2
--error ER_BAD_TABLE_ERROR
--reap
connection default;
drop table t3;
disconnect con1;
disconnect con2;
disconnect con3;
# Clean up resources used in this test case.
--disable_warnings
SET DEBUG_SYNC= 'RESET';
--enable_warnings
--echo #
--echo # Basic test coverage for type-of-operation aware metadata locks.
--echo #
--disable_warnings
drop table if exists t1, t2, t3;
--enable_warnings
connect(mdl_con1,localhost,root,,);
connect(mdl_con2,localhost,root,,);
connect(mdl_con3,localhost,root,,);
connection default;
set debug_sync= 'RESET';
create table t1 (c1 int);
--echo #
--echo # A) First let us check compatibility rules between differend kinds of
--echo # type-of-operation aware metadata locks.
--echo # Of course, these rules are already covered by the tests scattered
--echo # across the test suite. But it still makes sense to have one place
--echo # which covers all of them.
--echo #
--echo # 1) Acquire S (simple shared) lock on the table (by using HANDLER):
--echo #
handler t1 open;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that S, SH, SR and SW locks are compatible with it.
handler t1 open t;
handler t close;
select column_name from information_schema.columns where
table_schema='test' and table_name='t1';
select count(*) from t1;
insert into t1 values (1), (1);
--echo # Check that SNW lock is compatible with it. To do this use ALTER TABLE
--echo # which will fail after opening the table and thus obtaining SNW metadata
--echo # lock.
--error ER_DUP_ENTRY
alter table t1 add primary key (c1);
--echo # Check that SNRW lock is compatible with S lock.
lock table t1 write;
insert into t1 values (1);
unlock tables;
--echo # Check that X lock is incompatible with S lock.
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above RENAME is blocked because of S lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Unblock RENAME TABLE.
handler t1 close;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping RENAME TABLE.
--reap
--echo # Restore the original state of the things.
rename table t2 to t1;
--echo #
--echo # Switching to connection 'default'.
connection default;
handler t1 open;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that upgrade from SNW to X is blocked by presence of S lock.
--echo # Sending:
--send alter table t1 add column c2 int;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above ALTER TABLE is blocked because of S lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "alter table t1 add column c2 int";
--source include/wait_condition.inc
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Unblock ALTER TABLE.
handler t1 close;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping ALTER TABLE.
--reap
--echo # Restore the original state of the things.
alter table t1 drop column c2;
--echo #
--echo # Switching to connection 'default'.
connection default;
handler t1 open;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that upgrade from SNRW to X is blocked by presence of S lock.
lock table t1 write;
--echo # Sending:
--send alter table t1 add column c2 int;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above upgrade of SNRW to X in ALTER TABLE is blocked
--echo # because of S lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "alter table t1 add column c2 int";
--source include/wait_condition.inc
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Unblock ALTER TABLE.
handler t1 close;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping ALTER TABLE.
--reap
--echo # Restore the original state of the things.
alter table t1 drop column c2;
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo #
--echo # 2) Acquire SH (shared high-priority) lock on the table.
--echo # We have to involve DEBUG_SYNC facility for this as usually
--echo # such kind of locks are short-lived.
--echo #
set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
--echo # Sending:
--send select table_name, table_type, auto_increment, table_comment from information_schema.tables where table_schema='test' and table_name='t1';
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
set debug_sync= 'now WAIT_FOR locked';
--echo # Check that S, SH, SR and SW locks are compatible with it.
handler t1 open;
handler t1 close;
select column_name from information_schema.columns where
table_schema='test' and table_name='t1';
select count(*) from t1;
insert into t1 values (1);
--echo # Check that SNW lock is compatible with it. To do this use ALTER TABLE
--echo # which will fail after opening the table and thus obtaining SNW metadata
--echo # lock.
--error ER_DUP_ENTRY
alter table t1 add primary key (c1);
--echo # Check that SNRW lock is compatible with SH lock.
lock table t1 write;
delete from t1 limit 1;
unlock tables;
--echo # Check that X lock is incompatible with SH lock.
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above RENAME is blocked because of SH lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo # Unblock RENAME TABLE.
set debug_sync= 'now SIGNAL finish';
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping SELECT ... FROM I_S.
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping RENAME TABLE.
--reap
--echo # Restore the original state of the things.
rename table t2 to t1;
--echo #
--echo # Switching to connection 'default'.
connection default;
set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
--echo # Sending:
--send select table_name, table_type, auto_increment, table_comment from information_schema.tables where table_schema='test' and table_name='t1';
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
set debug_sync= 'now WAIT_FOR locked';
--echo # Check that upgrade from SNW to X is blocked by presence of SH lock.
--echo # Sending:
--send alter table t1 add column c2 int;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above ALTER TABLE is blocked because of SH lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "alter table t1 add column c2 int";
--source include/wait_condition.inc
--echo # Unblock RENAME TABLE.
set debug_sync= 'now SIGNAL finish';
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping SELECT ... FROM I_S.
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping ALTER TABLE.
--reap
--echo # Restore the original state of the things.
alter table t1 drop column c2;
--echo #
--echo # Switching to connection 'default'.
connection default;
set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
--send select table_name, table_type, auto_increment, table_comment from information_schema.tables where table_schema='test' and table_name='t1';
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
set debug_sync= 'now WAIT_FOR locked';
--echo # Check that upgrade from SNRW to X is blocked by presence of S lock.
lock table t1 write;
--echo # Sending:
--send alter table t1 add column c2 int;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above upgrade of SNRW to X in ALTER TABLE is blocked
--echo # because of S lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "alter table t1 add column c2 int";
--source include/wait_condition.inc
--echo # Unblock RENAME TABLE.
set debug_sync= 'now SIGNAL finish';
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping SELECT ... FROM I_S.
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping ALTER TABLE.
--reap
--echo # Restore the original state of the things.
alter table t1 drop column c2;
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo #
--echo #
--echo # 3) Acquire SR lock on the table.
--echo #
--echo #
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that S, SH, SR and SW locks are compatible with it.
handler t1 open;
handler t1 close;
select column_name from information_schema.columns where
table_schema='test' and table_name='t1';
select count(*) from t1;
insert into t1 values (1);
--echo # Check that SNW lock is compatible with it. To do this use ALTER TABLE
--echo # which will fail after opening the table and thus obtaining SNW metadata
--echo # lock.
--error ER_DUP_ENTRY
alter table t1 add primary key (c1);
--echo # Check that SNRW lock is not compatible with SR lock.
--echo # Sending:
--send lock table t1 write;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Check that the above LOCK TABLES is blocked because of SR lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "lock table t1 write";
--source include/wait_condition.inc
--echo # Unblock LOCK TABLES.
commit;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping LOCK TABLES.
--reap
delete from t1 limit 1;
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that X lock is incompatible with SR lock.
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above RENAME is blocked because of SR lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Unblock RENAME TABLE.
commit;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping RENAME TABLE.
--reap
--echo # Restore the original state of the things.
rename table t2 to t1;
--echo #
--echo # Switching to connection 'default'.
connection default;
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that upgrade from SNW to X is blocked by presence of SR lock.
--echo # Sending:
--send alter table t1 add column c2 int;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above ALTER TABLE is blocked because of SR lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "alter table t1 add column c2 int";
--source include/wait_condition.inc
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Unblock ALTER TABLE.
commit;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping ALTER TABLE.
--reap
--echo # Restore the original state of the things.
alter table t1 drop column c2;
--echo #
--echo # There is no need to check that upgrade from SNRW to X is blocked
--echo # by presence of SR lock because SNRW is incompatible with SR anyway.
--echo #
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo #
--echo #
--echo # 4) Acquire SW lock on the table.
--echo #
--echo #
begin;
insert into t1 values (1);
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that S, SH, SR and SW locks are compatible with it.
handler t1 open;
handler t1 close;
select column_name from information_schema.columns where
table_schema='test' and table_name='t1';
--echo # Disable result log to make test robust against
--echo # effects of concurrent insert.
--disable_result_log
select * from t1;
--enable_result_log
insert into t1 values (1);
--echo # Check that SNW lock is not compatible with SW lock.
--echo # Again we use ALTER TABLE which fails after opening
--echo # the table to avoid upgrade of SNW -> X.
--echo # Sending:
--send alter table t1 add primary key (c1);
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Check that the above ALTER TABLE is blocked because of SW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "alter table t1 add primary key (c1)";
--source include/wait_condition.inc
--echo # Unblock ALTER TABLE.
commit;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping ALTER TABLE.
--error ER_DUP_ENTRY
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
begin;
insert into t1 values (1);
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that SNRW lock is not compatible with SW lock.
--echo # Sending:
--send lock table t1 write;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Check that the above LOCK TABLES is blocked because of SW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "lock table t1 write";
--source include/wait_condition.inc
--echo # Unblock LOCK TABLES.
commit;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping LOCK TABLES.
--reap
delete from t1 limit 2;
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
begin;
insert into t1 values (1);
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that X lock is incompatible with SW lock.
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above RENAME is blocked because of SW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Unblock RENAME TABLE.
commit;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping RENAME TABLE.
--reap
--echo # Restore the original state of the things.
rename table t2 to t1;
--echo #
--echo # There is no need to check that upgrade from SNW/SNRW to X is
--echo # blocked by presence of SW lock because SNW/SNRW is incompatible
--echo # with SW anyway.
--echo #
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo #
--echo #
--echo # 5) Acquire SNW lock on the table. We have to use DEBUG_SYNC for
--echo # this, to prevent SNW from being immediately upgraded to X.
--echo #
set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
--echo # Sending:
--send alter table t1 add primary key (c1);
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
set debug_sync= 'now WAIT_FOR locked';
--echo # Check that S, SH and SR locks are compatible with it.
handler t1 open;
handler t1 close;
select column_name from information_schema.columns where
table_schema='test' and table_name='t1';
select count(*) from t1;
--echo # Check that SW lock is incompatible with SNW lock.
--echo # Sending:
--send delete from t1 limit 2;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above DELETE is blocked because of SNW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "delete from t1 limit 2";
--source include/wait_condition.inc
--echo # Unblock ALTER and thus DELETE.
set debug_sync= 'now SIGNAL finish';
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping ALTER TABLE.
--error ER_DUP_ENTRY
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping DELETE.
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
--echo # Sending:
--send alter table t1 add primary key (c1);
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
set debug_sync= 'now WAIT_FOR locked';
--echo # Check that SNW lock is incompatible with SNW lock.
--echo # Sending:
--send alter table t1 add primary key (c1);
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above ALTER is blocked because of SNW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "alter table t1 add primary key (c1)";
--source include/wait_condition.inc
--echo # Unblock ALTERs.
set debug_sync= 'now SIGNAL finish';
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping first ALTER TABLE.
--error ER_DUP_ENTRY
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping another ALTER TABLE.
--error ER_DUP_ENTRY
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
--echo # Sending:
--send alter table t1 add primary key (c1);
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
set debug_sync= 'now WAIT_FOR locked';
--echo # Check that SNRW lock is incompatible with SNW lock.
--echo # Sending:
--send lock table t1 write;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above LOCK TABLES is blocked because of SNW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "lock table t1 write";
--source include/wait_condition.inc
--echo # Unblock ALTER and thus LOCK TABLES.
set debug_sync= 'now SIGNAL finish';
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping ALTER TABLE.
--error ER_DUP_ENTRY
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping LOCK TABLES
--reap
insert into t1 values (1);
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
--echo # Sending:
--send alter table t1 add primary key (c1);
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
set debug_sync= 'now WAIT_FOR locked';
--echo # Check that X lock is incompatible with SNW lock.
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above RENAME is blocked because of SNW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo # Unblock ALTER and thus RENAME TABLE.
set debug_sync= 'now SIGNAL finish';
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping ALTER TABLE.
--error ER_DUP_ENTRY
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping RENAME TABLE
--reap
--echo # Revert back to original state of things.
rename table t2 to t1;
--echo #
--echo # There is no need to check that upgrade from SNW/SNRW to X is
--echo # blocked by presence of another SNW lock because SNW/SNRW is
--echo # incompatible with SNW anyway.
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo #
--echo #
--echo # 6) Acquire SNRW lock on the table.
--echo #
--echo #
lock table t1 write;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that S and SH locks are compatible with it.
handler t1 open;
handler t1 close;
select column_name from information_schema.columns where
table_schema='test' and table_name='t1';
--echo # Check that SR lock is incompatible with SNRW lock.
--echo # Sending:
--send select count(*) from t1;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Check that the above SELECT is blocked because of SNRW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "select count(*) from t1";
--source include/wait_condition.inc
--echo # Unblock SELECT.
unlock tables;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping SELECT.
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
lock table t1 write;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that SW lock is incompatible with SNRW lock.
--echo # Sending:
--send delete from t1 limit 1;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Check that the above DELETE is blocked because of SNRW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "delete from t1 limit 1";
--source include/wait_condition.inc
--echo # Unblock DELETE.
unlock tables;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping DELETE.
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
lock table t1 write;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that SNW lock is incompatible with SNRW lock.
--echo # Sending:
--send alter table t1 add primary key (c1);
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Check that the above ALTER is blocked because of UNWR lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "alter table t1 add primary key (c1)";
--source include/wait_condition.inc
--echo # Unblock ALTER.
unlock tables;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping ALTER TABLE.
--error ER_DUP_ENTRY
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
lock table t1 write;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that SNRW lock is incompatible with SNRW lock.
--echo # Sending:
--send lock table t1 write;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Check that the above LOCK TABLES is blocked because of SNRW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "lock table t1 write";
--source include/wait_condition.inc
--echo # Unblock waiting LOCK TABLES.
unlock tables;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping LOCK TABLES
--reap
insert into t1 values (1);
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
lock table t1 write;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that X lock is incompatible with SNRW lock.
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Check that the above RENAME is blocked because of SNRW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo # Unblock RENAME TABLE
unlock tables;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping RENAME TABLE
--reap
--echo # Revert back to original state of things.
rename table t2 to t1;
--echo #
--echo # There is no need to check that upgrade from SNW/SNRW to X is
--echo # blocked by presence of another SNRW lock because SNW/SNRW is
--echo # incompatible with SNRW anyway.
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo #
--echo #
--echo # 7) Now do the same round of tests for X lock. We use additional
--echo # table to get long-lived lock of this type.
--echo #
create table t2 (c1 int);
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Take a lock on t2, so RENAME TABLE t1 TO t2 will get blocked
--echo # after acquiring X lock on t1.
lock tables t2 read;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that RENAME has acquired X lock on t1 and is waiting for t2.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo # Check that S lock in incompatible with X lock.
--echo # Sending:
--send handler t1 open;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above HANDLER statement is blocked because of X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "handler t1 open";
--source include/wait_condition.inc
--echo # Unblock RENAME TABLE
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping RENAME TABLE.
--error ER_TABLE_EXISTS_ERROR
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping HANDLER.
--reap
handler t1 close;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Prepare for blocking RENAME TABLE.
lock tables t2 read;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that RENAME has acquired X lock on t1 and is waiting for t2.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo # Check that SH lock in incompatible with X lock.
--echo # Sending:
--send select column_name from information_schema.columns where table_schema='test' and table_name='t1';
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above SELECT ... FROM I_S ... statement is blocked
--echo # because of X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info like "select column_name from information_schema.columns%";
--source include/wait_condition.inc
--echo # Unblock RENAME TABLE
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping RENAME TABLE.
--error ER_TABLE_EXISTS_ERROR
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping SELECT ... FROM I_S.
--reap
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Prepare for blocking RENAME TABLE.
lock tables t2 read;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that RENAME has acquired X lock on t1 and is waiting for t2.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo # Check that SR lock in incompatible with X lock.
--echo # Sending:
--send select count(*) from t1;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above SELECT statement is blocked
--echo # because of X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "select count(*) from t1";
--source include/wait_condition.inc
--echo # Unblock RENAME TABLE
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping RENAME TABLE.
--error ER_TABLE_EXISTS_ERROR
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping SELECT.
--reap
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Prepare for blocking RENAME TABLE.
lock tables t2 read;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that RENAME has acquired X lock on t1 and is waiting for t2.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo # Check that SW lock in incompatible with X lock.
--echo # Sending:
--send delete from t1 limit 1;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above DELETE statement is blocked
--echo # because of X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "delete from t1 limit 1";
--source include/wait_condition.inc
--echo # Unblock RENAME TABLE
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping RENAME TABLE.
--error ER_TABLE_EXISTS_ERROR
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping DELETE.
--reap
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Prepare for blocking RENAME TABLE.
lock tables t2 read;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that RENAME has acquired X lock on t1 and is waiting for t2.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo # Check that SNW lock is incompatible with X lock.
--echo # Sending:
--send alter table t1 add primary key (c1);
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above ALTER statement is blocked
--echo # because of X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "alter table t1 add primary key (c1)";
--source include/wait_condition.inc
--echo # Unblock RENAME TABLE
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping RENAME TABLE
--error ER_TABLE_EXISTS_ERROR
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping ALTER.
--error ER_DUP_ENTRY
--reap
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Prepare for blocking RENAME TABLE.
lock tables t2 read;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that RENAME has acquired X lock on t1 and is waiting for t2.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo # Check that SNRW lock is incompatible with X lock.
--echo # Sending:
--send lock table t1 write;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above LOCK TABLE statement is blocked
--echo # because of X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "lock table t1 write";
--source include/wait_condition.inc
--echo # Unblock RENAME TABLE
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping RENAME TABLE
--error ER_TABLE_EXISTS_ERROR
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping LOCK TABLE.
--reap
unlock tables;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Prepare for blocking RENAME TABLE.
lock tables t2 read;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that RENAME has acquired X lock on t1 and is waiting for t2.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo # Check that X lock is incompatible with X lock.
--echo # Sending:
--send rename table t1 to t3;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above RENAME statement is blocked
--echo # because of X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t3";
--source include/wait_condition.inc
--echo # Unblock RENAME TABLE
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping RENAME TABLE
--error ER_TABLE_EXISTS_ERROR
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping RENAME.
--reap
rename table t3 to t1;
--echo #
--echo # B) Now let us test compatibility in cases when both locks
--echo # are pending. I.e. let us test rules for priorities between
--echo # different types of metadata locks.
--echo #
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo #
--echo # 1) Check compatibility for pending SNW lock.
--echo #
--echo # Acquire SW lock in order to create pending SNW lock later.
begin;
insert into t1 values (1);
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Add pending SNW lock.
--echo # Sending:
--send alter table t1 add primary key (c1);
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that ALTER TABLE is waiting with pending SNW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "alter table t1 add primary key (c1)";
--source include/wait_condition.inc
--echo # Check that S, SH and SR locks are compatible with pending SNW
handler t1 open t;
handler t close;
select column_name from information_schema.columns where
table_schema='test' and table_name='t1';
select count(*) from t1;
--echo # Check that SW is incompatible with pending SNW
--echo # Sending:
--send delete from t1 limit 1;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above DELETE is blocked because of pending SNW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "delete from t1 limit 1";
--source include/wait_condition.inc
--echo # Unblock ALTER TABLE.
commit;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping ALTER.
--error ER_DUP_ENTRY
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping DELETE.
--reap
--echo #
--echo # We can't do similar check for SNW, SNRW and X locks because
--echo # they will also be blocked by active SW lock.
--echo #
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo #
--echo # 2) Check compatibility for pending SNRW lock.
--echo #
--echo # Acquire SR lock in order to create pending SNRW lock.
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Add pending SNRW lock.
--echo # Sending:
--send lock table t1 write;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that LOCK TABLE is waiting with pending SNRW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "lock table t1 write";
--source include/wait_condition.inc
--echo # Check that S and SH locks are compatible with pending SNRW
handler t1 open t;
handler t close;
select column_name from information_schema.columns where
table_schema='test' and table_name='t1';
--echo # Check that SR is incompatible with pending SNRW
--echo # Sending:
--send select count(*) from t1;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above SELECT is blocked because of pending SNRW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "select count(*) from t1";
--source include/wait_condition.inc
--echo # Unblock LOCK TABLE.
commit;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping LOCK TABLE.
--reap
unlock tables;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping SELECT.
--reap
--echo # Restore pending SNRW lock.
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Sending:
--send lock table t1 write;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that LOCK TABLE is waiting with pending SNRW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "lock table t1 write";
--source include/wait_condition.inc
--echo # Check that SW is incompatible with pending SNRW
--echo # Sending:
--send insert into t1 values (1);
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above INSERT is blocked because of pending SNRW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "insert into t1 values (1)";
--source include/wait_condition.inc
--echo # Unblock LOCK TABLE.
commit;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping LOCK TABLE.
--reap
unlock tables;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping INSERT.
--reap
--echo # Restore pending SNRW lock.
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Sending:
--send lock table t1 write;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that LOCK TABLE is waiting with pending SNRW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "lock table t1 write";
--source include/wait_condition.inc
--echo # Check that SNW is compatible with pending SNRW
--echo # So ALTER TABLE statements are not starved by LOCK TABLEs.
--error ER_DUP_ENTRY
alter table t1 add primary key (c1);
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Unblock LOCK TABLE.
commit;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping LOCK TABLE.
--reap
unlock tables;
--echo #
--echo # We can't do similar check for SNRW and X locks because
--echo # they will also be blocked by active SR lock.
--echo #
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo #
--echo # 3) Check compatibility for pending X lock.
--echo #
--echo # Acquire SR lock in order to create pending X lock.
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Add pending X lock.
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that RENAME TABLE is waiting with pending X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo # Check that SH locks are compatible with pending X
select column_name from information_schema.columns where
table_schema='test' and table_name='t1';
--echo # Check that S is incompatible with pending X
--echo # Sending:
--send handler t1 open;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above HANDLER OPEN is blocked because of pending X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "handler t1 open";
--source include/wait_condition.inc
--echo # Unblock RENAME TABLE.
commit;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping RENAME TABLE.
--error ER_TABLE_EXISTS_ERROR
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping HANDLER t1 OPEN.
--reap
handler t1 close;
--echo # Restore pending X lock.
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Add pending X lock.
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that RENAME TABLE is waiting with pending X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo # Check that SR is incompatible with pending X
--echo # Sending:
--send select count(*) from t1;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above SELECT is blocked because of pending X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "select count(*) from t1";
--source include/wait_condition.inc
--echo # Unblock RENAME TABLE.
commit;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping RENAME TABLE.
--error ER_TABLE_EXISTS_ERROR
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping SELECT.
--reap
--echo # Restore pending X lock.
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Add pending X lock.
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that RENAME TABLE is waiting with pending X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo # Check that SW is incompatible with pending X
--echo # Sending:
--send delete from t1 limit 1;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above DELETE is blocked because of pending X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "delete from t1 limit 1";
--source include/wait_condition.inc
--echo # Unblock RENAME TABLE.
commit;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping RENAME TABLE.
--error ER_TABLE_EXISTS_ERROR
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping DELETE.
--reap
--echo # Restore pending X lock.
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Add pending X lock.
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that RENAME TABLE is waiting with pending X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo # Check that SNW is incompatible with pending X
--echo # Sending:
--send alter table t1 add primary key (c1);
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above ALTER TABLE is blocked because of pending X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "alter table t1 add primary key (c1)";
--source include/wait_condition.inc
--echo # Unblock RENAME TABLE.
commit;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping RENAME TABLE.
--error ER_TABLE_EXISTS_ERROR
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping ALTER TABLE.
--error ER_DUP_ENTRY
--reap
--echo # Restore pending X lock.
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
handler t1 open;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Add pending X lock.
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that RENAME TABLE is waiting with pending X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo # Check that SNRW is incompatible with pending X
--echo # Sending:
--send lock table t1 write;
--echo #
--echo # Switching to connection 'mdl_con3'.
connection mdl_con3;
--echo # Check that the above LOCK TABLES is blocked because of pending X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "lock table t1 write";
--source include/wait_condition.inc
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Unblock RENAME TABLE.
handler t1 close;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping RENAME TABLE.
--error ER_TABLE_EXISTS_ERROR
--reap
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reaping LOCK TABLES.
--reap
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo #
--echo #
--echo # C) Now let us test how type-of-operation locks are handled in
--echo # transactional context. Obviously we are mostly interested
--echo # in conflicting types of locks.
--echo #
--echo #
--echo # 1) Let us check how various locks used within transactional
--echo # context interact with active/pending SNW lock.
--echo #
--echo # We start with case when we are acquiring lock on the table
--echo # which was not used in the transaction before.
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Create an active SNW lock on t2.
--echo # We have to use DEBUG_SYNC facility as otherwise SNW lock
--echo # will be immediately released (or upgraded to X lock).
insert into t2 values (1), (1);
set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
--echo # Sending:
--send alter table t2 add primary key (c1);
--echo #
--echo # Switching to connection 'default'.
connection default;
set debug_sync= 'now WAIT_FOR locked';
--echo # SR lock should be acquired without any waiting.
select count(*) from t2;
commit;
--echo # Now let us check that we will wait in case of SW lock.
begin;
select count(*) from t1;
--echo # Sending:
--send insert into t2 values (1);
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above INSERT is blocked.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "insert into t2 values (1)";
--source include/wait_condition.inc
--echo # Unblock ALTER TABLE and thus INSERT.
set debug_sync= 'now SIGNAL finish';
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reap ALTER TABLE.
--error ER_DUP_ENTRY
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reap INSERT.
--reap
commit;
--echo #
--echo # Now let us see what happens when we are acquiring lock on the table
--echo # which is already used in transaction.
--echo #
--echo # *) First, case when transaction which has SR lock on the table also
--echo # locked in SNW mode acquires yet another SR lock and then tries
--echo # to acquire SW lock.
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Create an active SNW lock on t1.
set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
--echo # Sending:
--send alter table t1 add primary key (c1);
--echo #
--echo # Switching to connection 'default'.
connection default;
set debug_sync= 'now WAIT_FOR locked';
--echo # We should still be able to get SR lock without waiting.
select count(*) from t1;
--echo # Since the above ALTER TABLE is not upgrading SNW lock to X by waiting
--echo # for SW lock we won't create deadlock.
--echo # So the below INSERT should not end-up with ER_LOCK_DEADLOCK error.
--echo # Sending:
--send insert into t1 values (1);
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above INSERT is blocked.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "insert into t1 values (1)";
--source include/wait_condition.inc
--echo # Unblock ALTER TABLE and thus INSERT.
set debug_sync= 'now SIGNAL finish';
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reap ALTER TABLE.
--error ER_DUP_ENTRY
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reap INSERT.
--reap
commit;
--echo #
--echo # **) Now test in which transaction that has SW lock on the table
--echo # against which there is pending SNW lock acquires SR and SW
--echo # locks on this table.
--echo #
begin;
insert into t1 values (1);
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Create pending SNW lock on t1.
--echo # Sending:
--send alter table t1 add primary key (c1);
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Wait until ALTER TABLE starts waiting for SNW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "alter table t1 add primary key (c1)";
--source include/wait_condition.inc
--echo # We should still be able to get both SW and SR locks without waiting.
select count(*) from t1;
delete from t1 limit 1;
--echo # Unblock ALTER TABLE.
commit;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reap ALTER TABLE.
--error ER_DUP_ENTRY
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo #
--echo # 2) Now similar tests for active SNW lock which is being upgraded
--echo # to X lock.
--echo #
--echo # Again we start with case when we are acquiring lock on the
--echo # table which was not used in the transaction before.
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Start transaction which will prevent SNW -> X upgrade from
--echo # completing immediately.
begin;
select count(*) from t2;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Create SNW lock pending upgrade to X on t2.
--echo # Sending:
--send alter table t2 add column c2 int;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Wait until ALTER TABLE starts waiting X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "alter table t2 add column c2 int";
--source include/wait_condition.inc
--echo # Check that attempt to acquire SR lock on t2 causes waiting.
--echo # Sending:
--send select count(*) from t2;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above SELECT is blocked.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "select count(*) from t2";
--source include/wait_condition.inc
--echo # Unblock ALTER TABLE.
commit;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reap ALTER TABLE.
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reap SELECT.
--reap
commit;
--echo # Do similar check for SW lock.
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Start transaction which will prevent SNW -> X upgrade from
--echo # completing immediately.
begin;
select count(*) from t2;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Create SNW lock pending upgrade to X on t2.
--echo # Sending:
--send alter table t2 drop column c2;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Wait until ALTER TABLE starts waiting X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "alter table t2 drop column c2";
--source include/wait_condition.inc
--echo # Check that attempt to acquire SW lock on t2 causes waiting.
--echo # Sending:
--send insert into t2 values (1);
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above INSERT is blocked.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "insert into t2 values (1)";
--source include/wait_condition.inc
--echo # Unblock ALTER TABLE.
commit;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reap ALTER TABLE.
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reap INSERT.
--reap
commit;
--echo #
--echo # Test for the case in which we are acquiring lock on the table
--echo # which is already used in transaction.
--echo #
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Create SNW lock pending upgrade to X.
--echo # Sending:
--send alter table t1 add column c2 int;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Wait until ALTER TABLE starts waiting X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "alter table t1 add column c2 int";
--source include/wait_condition.inc
--echo # Check that transaction is still able to acquire SR lock.
select count(*) from t1;
--echo # Waiting trying to acquire SW lock will cause deadlock and
--echo # therefore should cause an error.
--error ER_LOCK_DEADLOCK
delete from t1 limit 1;
--echo # Unblock ALTER TABLE.
commit;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reap ALTER TABLE.
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo #
--echo # 3) Check how various locks used within transactional context
--echo # interact with active/pending SNRW lock.
--echo #
--echo # Once again we start with case when we are acquiring lock on
--echo # the table which was not used in the transaction before.
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
lock table t2 write;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Attempt to acquire SR should be blocked. It should
--echo # not cause errors as it does not creates deadlock.
--echo # Sending:
--send select count(*) from t2;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that the above SELECT is blocked
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "select count(*) from t2";
--source include/wait_condition.inc
--echo # Unblock SELECT.
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reap SELECT.
--reap
commit;
--echo # Repeat the same test for SW lock.
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
lock table t2 write;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Again attempt to acquire SW should be blocked and should
--echo # not cause any errors.
--echo # Sending:
--send delete from t2 limit 1;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Check that the above DELETE is blocked
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "delete from t2 limit 1";
--source include/wait_condition.inc
--echo # Unblock DELETE.
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reap DELETE.
--reap
commit;
--echo #
--echo # Now coverage for the case in which we are acquiring lock on
--echo # the table which is already used in transaction and against
--echo # which there is a pending SNRW lock request.
--echo #
--echo # *) Let us start with case when transaction has only a SR lock.
--echo #
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Sending:
--send lock table t1 write;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Wait until LOCK TABLE is blocked creating pending request for X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "lock table t1 write";
--source include/wait_condition.inc
--echo # Check that another instance of SR lock is granted without waiting.
select count(*) from t1;
--echo # Attempt to wait for SW lock will lead to deadlock, thus
--echo # the below statement should end with ER_LOCK_DEADLOCK error.
--error ER_LOCK_DEADLOCK
delete from t1 limit 1;
--echo # Unblock LOCK TABLES.
commit;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reap LOCK TABLES.
--reap
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo #
--echo # **) Now case when transaction has a SW lock.
--echo #
begin;
delete from t1 limit 1;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Sending:
--send lock table t1 write;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Wait until LOCK TABLE is blocked creating pending request for X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "lock table t1 write";
--source include/wait_condition.inc
--echo # Check that both SR and SW locks are granted without waiting
--echo # and errors.
select count(*) from t1;
insert into t1 values (1, 1);
--echo # Unblock LOCK TABLES.
commit;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reap LOCK TABLES.
--reap
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo #
--echo # 4) Check how various locks used within transactional context
--echo # interact with active/pending X lock.
--echo #
--echo # As usual we start with case when we are acquiring lock on
--echo # the table which was not used in the transaction before.
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Start transaction which will prevent X lock from going away
--echo # immediately.
begin;
select count(*) from t2;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Create pending X lock on t2.
--echo # Sending:
--send rename table t2 to t3;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Wait until RENAME TABLE starts waiting with pending X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t2 to t3";
--source include/wait_condition.inc
--echo # Check that attempt to acquire SR lock on t2 causes waiting.
--echo # Sending:
--send select count(*) from t2;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above SELECT is blocked.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "select count(*) from t2";
--source include/wait_condition.inc
--echo # Unblock RENAME TABLE.
commit;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reap RENAME TABLE.
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reap SELECT.
--error ER_NO_SUCH_TABLE
--reap
commit;
rename table t3 to t2;
--echo # The same test for SW lock.
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Start transaction which will prevent X lock from going away
--echo # immediately.
begin;
select count(*) from t2;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Create pending X lock on t2.
--echo # Sending:
--send rename table t2 to t3;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Wait until RENAME TABLE starts waiting with pending X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t2 to t3";
--source include/wait_condition.inc
--echo # Check that attempt to acquire SW lock on t2 causes waiting.
--echo # Sending:
--send delete from t2 limit 1;
--echo #
--echo # Switching to connection 'mdl_con2'.
connection mdl_con2;
--echo # Check that the above DELETE is blocked.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "delete from t2 limit 1";
--source include/wait_condition.inc
--echo # Unblock RENAME TABLE.
commit;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reap RENAME TABLE.
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reap DELETE.
--error ER_NO_SUCH_TABLE
--reap
commit;
rename table t3 to t2;
--echo #
--echo # Coverage for the case in which we are acquiring lock on
--echo # the table which is already used in transaction and against
--echo # which there is a pending X lock request.
--echo #
--echo # *) The first case is when transaction has only a SR lock.
--echo #
begin;
select count(*) from t1;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Wait until RENAME TABLE is blocked creating pending request for X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo # Check that another instance of SR lock is granted without waiting.
select count(*) from t1;
--echo # Attempt to wait for SW lock will lead to deadlock, thus
--echo # the below statement should end with ER_LOCK_DEADLOCK error.
--error ER_LOCK_DEADLOCK
delete from t1 limit 1;
--echo # Unblock RENAME TABLE.
commit;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reap RENAME TABLE.
--error ER_TABLE_EXISTS_ERROR
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo #
--echo # **) The second case is when transaction has a SW lock.
--echo #
begin;
delete from t1 limit 1;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Sending:
--send rename table t1 to t2;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Wait until RENAME TABLE is blocked creating pending request for X lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t2";
--source include/wait_condition.inc
--echo # Check that both SR and SW locks are granted without waiting
--echo # and errors.
select count(*) from t1;
insert into t1 values (1, 1);
--echo # Unblock RENAME TABLE.
commit;
--echo #
--echo # Switching to connection 'mdl_con1'.
connection mdl_con1;
--echo # Reap RENAME TABLE.
--error ER_TABLE_EXISTS_ERROR
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Clean-up.
disconnect mdl_con1;
disconnect mdl_con2;
disconnect mdl_con3;
set debug_sync= 'RESET';
drop table t1, t2;
--echo #
--echo # Additional coverage for some scenarios in which not quite
--echo # correct use of S metadata locks by HANDLER statement might
--echo # have caused deadlocks.
--echo #
--disable_warnings
drop table if exists t1, t2;
--enable_warnings
connect(handler_con1,localhost,root,,);
connect(handler_con2,localhost,root,,);
connection default;
create table t1 (i int);
create table t2 (j int);
insert into t1 values (1);
--echo #
--echo # First, check scenario in which we upgrade SNRW lock to X lock
--echo # on a table while having HANDLER READ trying to acquire TL_READ
--echo # on the same table.
--echo #
handler t1 open;
--echo #
--echo # Switching to connection 'handler_con1'.
connection handler_con1;
lock table t1 write;
--echo # Upgrade SNRW to X lock.
--echo # Sending:
--send alter table t1 add column j int;
--echo #
--echo # Switching to connection 'handler_con2'.
connection handler_con2;
--echo # Wait until ALTER is blocked during upgrade.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "alter table t1 add column j int";
--source include/wait_condition.inc
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # The below statement should not cause deadlock.
--send handler t1 read first;
--echo #
--echo # Switching to connection 'handler_con1'.
connection handler_con1;
--echo # Reap ALTER TABLE.
--reap
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reap HANDLER READ.
--reap
handler t1 close;
--echo #
--echo # Now, check scenario in which upgrade of SNRW lock to X lock
--echo # can be blocked by HANDLER which is open in connection currently
--echo # waiting to get table-lock owned by connection doing upgrade.
--echo #
handler t1 open;
--echo #
--echo # Switching to connection 'handler_con1'.
connection handler_con1;
lock table t1 write, t2 read;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Execute statement which will be blocked on table-level lock
--echo # owned by connection 'handler_con1'.
--echo # Sending:
--send insert into t2 values (1);
--echo #
--echo # Switching to connection 'handler_con1'.
connection handler_con1;
--echo # Wait until INSERT is blocked on table-level lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table level lock" and
info = "insert into t2 values (1)";
--source include/wait_condition.inc
--echo # Sending 'alter table t1 drop column j'. It should not cause
--echo # deadlock.
send alter table t1 drop column j;
--echo # Switching to connection 'handler_con2'.
connection handler_con2;
--echo # Wait until ALTER is blocked during upgrade.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "alter table t1 drop column j";
--source include/wait_condition.inc
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reap INSERT.
--error ER_LOCK_ABORTED
--reap
handler t1 close;
--echo #
--echo # Switching to connection 'handler_con1'.
connection handler_con1;
--echo # Reaping 'alter table t1 drop column j'
--reap
unlock tables;
--echo # Switching to connection 'default'.
connection default;
--echo # Then, check the scenario in which upgrade of SNRW lock to X
--echo # lock is blocked by HANDLER which is open in connection currently
--echo # waiting to get SW lock on the same table.
--echo #
handler t1 open;
--echo #
--echo # Switching to connection 'handler_con1'.
connection handler_con1;
lock table t1 write;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # The below insert should be blocked because active SNRW lock on 't1'.
--echo # Sending:
--send insert into t1 values (1);
--echo #
--echo # Switching to connection 'handler_con1'.
connection handler_con1;
--echo # Wait until INSERT is blocked because of SNRW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "insert into t1 values (1)";
--source include/wait_condition.inc
--echo # The below ALTER TABLE will be blocked because of presence of HANDLER.
--echo # Sending:
--send alter table t1 add column j int;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # INSERT should be chosen as victim for resolving deadlock.
--echo # Reaping INSERT.
--error ER_LOCK_DEADLOCK
--reap
--echo # Close HANDLER to unblock ALTER TABLE.
handler t1 close;
--echo #
--echo # Switching to connection 'handler_con1'.
connection handler_con1;
--echo # Reaping ALTER TABLE.
--reap
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo #
--echo # Finally, test in which upgrade of SNRW lock to X lock is blocked
--echo # by HANDLER which is open in connection currently waiting to get
--echo # SR lock on the table on which lock is upgraded.
--echo #
handler t1 open;
--echo #
--echo # Switching to connection 'handler_con1'.
connection handler_con1;
lock table t1 write, t2 write;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # The below insert should be blocked because active SNRW lock on 't1'.
--echo # Sending:
--send insert into t2 values (1);
--echo #
--echo # Switching to connection 'handler_con1'.
connection handler_con1;
--echo # Wait until INSERT is blocked because of SNRW lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "insert into t2 values (1)";
--source include/wait_condition.inc
--echo # The below ALTER TABLE will be blocked because of presence of HANDLER.
--echo # Sending:
--send alter table t1 drop column j;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # INSERT should be chosen as victim for resolving deadlock.
--echo # Reaping INSERT.
--error ER_LOCK_DEADLOCK
--reap
--echo # Close HANDLER to unblock ALTER TABLE.
handler t1 close;
--echo #
--echo # Switching to connection 'handler_con1'.
connection handler_con1;
--echo # Reaping ALTER TABLE.
--reap
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Clean-up.
disconnect handler_con1;
disconnect handler_con2;
drop tables t1, t2;
--echo #
--echo # Test coverage for basic deadlock detection in metadata
--echo # locking subsystem.
--echo #
--disable_warnings
drop tables if exists t0, t1, t2, t3, t4, t5;
--enable_warnings
set debug_sync= 'RESET';
connect(deadlock_con1,localhost,root,,);
connect(deadlock_con2,localhost,root,,);
connect(deadlock_con3,localhost,root,,);
connection default;
create table t1 (i int);
create table t2 (j int);
create table t3 (k int);
create table t4 (k int);
--echo #
--echo # Test for the case in which no deadlock occurs.
--echo #
--echo #
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
begin;
insert into t1 values (1);
--echo #
--echo # Switching to connection 'deadlock_con2'.
connection deadlock_con2;
begin;
insert into t2 values (1);
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Send:
--send rename table t2 to t0, t3 to t2, t0 to t3;
--echo #
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
--echo # Wait until the above RENAME TABLE is blocked because it has to wait
--echo # for 'deadlock_con2' which holds shared metadata lock on 't2'.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t2 to t0, t3 to t2, t0 to t3";
--source include/wait_condition.inc
--echo # The below statement should wait for exclusive metadata lock
--echo # on 't2' to go away and should not produce ER_LOCK_DEADLOCK
--echo # as no deadlock is possible in this situation.
--echo # Send:
--send select * from t2;
--echo #
--echo # Switching to connection 'deadlock_con2'.
connection deadlock_con2;
--echo # Wait until the above SELECT * FROM t2 is starts waiting
--echo # for an exclusive metadata lock to go away.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "select * from t2";
--source include/wait_condition.inc
--echo #
--echo # Unblock RENAME TABLE by releasing shared metadata lock on t2.
commit;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reap RENAME TABLE.
--reap
--echo #
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
--echo # Reap SELECT.
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo #
--echo # Let us check that in the process of waiting for conflicting lock
--echo # on table 't2' to go away transaction in connection 'deadlock_con1'
--echo # has not released metadata lock on table 't1'.
--echo # Send:
--send rename table t1 to t0, t3 to t1, t0 to t3;
--echo #
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
--echo # Wait until the above RENAME TABLE is blocked because it has to wait
--echo # for 'deadlock_con1' which should still hold shared metadata lock on
--echo # table 't1'.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t0, t3 to t1, t0 to t3";
--source include/wait_condition.inc
--echo # Commit transaction to unblock RENAME TABLE.
commit;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reap RENAME TABLE.
--reap
--echo #
--echo # Test for case when deadlock occurs and should be detected immediately.
--echo #
--echo #
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
begin;
insert into t2 values (2);
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Send:
--send rename table t2 to t0, t1 to t2, t0 to t1;
--echo #
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
--echo # Wait until the above RENAME TABLE is blocked because it has to wait
--echo # for 'deadlock_con1' which holds shared metadata lock on 't2'.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t2 to t0, t1 to t2, t0 to t1";
--source include/wait_condition.inc
--echo #
--echo # The below statement should not wait as doing so will cause deadlock.
--echo # Instead it should fail and emit ER_LOCK_DEADLOCK statement and
--echo # transaction should be rolled back.
--error ER_LOCK_DEADLOCK
select * from t1;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reap RENAME TABLE.
--reap
--echo #
--echo # Test for the case in which deadlock also occurs but not immediately.
--echo #
--echo #
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
begin;
insert into t2 values (1);
--echo #
--echo # Switching to connection 'default'.
connection default;
lock table t1 write;
--echo #
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
--echo # The below SELECT statement should wait for metadata lock
--echo # on table 't1' and should not produce ER_LOCK_DEADLOCK
--echo # immediately as no deadlock is possible at the moment.
--send select * from t1;
--echo #
--echo # Switching to connection 'deadlock_con2'.
connection deadlock_con2;
--echo # Wait until the above SELECT * FROM t1 is starts waiting
--echo # for an UNRW metadata lock to go away.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and info = "select * from t1";
--source include/wait_condition.inc
--echo # Send RENAME TABLE statement that will deadlock with the
--echo # SELECT statement and thus should abort the latter.
--send rename table t1 to t0, t2 to t1, t0 to t2;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Wait till above RENAME TABLE is blocked while holding
--echo # pending X lock on t1.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "rename table t1 to t0, t2 to t1, t0 to t2";
--source include/wait_condition.inc
--echo # Allow the above RENAME TABLE to acquire lock on t1 and
--echo # create pending lock on t2 thus creating deadlock.
unlock tables;
--echo #
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
--echo # Since the latest RENAME TABLE entered in deadlock with SELECT
--echo # statement the latter should be aborted and emit ER_LOCK_DEADLOCK
--echo # error and transaction should be rolled back.
--echo # Reap SELECT * FROM t1.
--error ER_LOCK_DEADLOCK
--reap
--echo #
--echo # Switching to connection 'deadlock_con2'.
connection deadlock_con2;
--echo # Reap RENAME TABLE ... .
--reap;
--echo #
--echo # Switching to connection 'default'.
connection default;
drop tables t1, t2, t3, t4;
--echo #
--echo # Now, test case which shows that deadlock detection empiric
--echo # also takes into account requests for metadata lock upgrade.
--echo #
create table t1 (i int);
insert into t1 values (1);
--echo # Avoid race which occurs when SELECT in 'deadlock_con1' connection
--echo # accesses table before the above INSERT unlocks the table and thus
--echo # its result becomes visible to other connections.
select * from t1;
--echo #
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
begin;
select * from t1;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Send:
--send alter table t1 add column j int, rename to t2;
--echo #
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
--echo # Wait until the above ALTER TABLE ... RENAME acquires exclusive
--echo # metadata lock on 't2' and starts waiting for connection
--echo # 'deadlock_con1' which holds shared lock on 't1'.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "alter table t1 add column j int, rename to t2";
--source include/wait_condition.inc
--echo # The below statement should not wait as it will cause deadlock.
--echo # An appropriate error should be reported instead and transaction
--echo # should be rolled back.
--error ER_LOCK_DEADLOCK
select * from t2;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reap ALTER TABLE ... RENAME.
--reap
drop table t2;
--echo #
--echo # Test that in situation when MDL subsystem detects a deadlock
--echo # but it turns out that it can be resolved by backing-off locks
--echo # acquired by one of participating transactions (which is
--echo # possible when one of transactions consists only of currently
--echo # executed statement, e.g. in autocommit mode) no error is
--echo # reported.
--echo #
create table t1 (i int);
create table t2 (j int);
--echo # Ensure that the below SELECT stops once it has acquired metadata
--echo # lock on table 't2'.
set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
--echo # Sending:
--send select * from t2, t1
--echo #
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
--echo # Wait till SELECT acquires MDL on 't2' and starts waiting for signal.
set debug_sync= 'now WAIT_FOR locked';
--echo # Sending:
--send lock tables t1 write, t2 write
--echo #
--echo # Switching to connection 'deadlock_con2'.
connection deadlock_con2;
--echo # Wait until LOCK TABLES acquires SNRW lock on 't1' and is blocked
--echo # while trying to acquire SNRW lock on 't1'.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "lock tables t1 write, t2 write";
--source include/wait_condition.inc
--echo # Resume SELECT execution, this should eventually unblock LOCK TABLES.
set debug_sync= 'now SIGNAL finish';
--echo #
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
--echo # Reaping LOCK TABLES.
--reap
unlock tables;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping SELECT. It succeed and not report ER_LOCK_DEADLOCK error.
--reap
drop tables t1, t2;
--echo #
--echo # Test coverage for situation in which a race has happened
--echo # during deadlock detection process which led to unwarranted
--echo # ER_LOCK_DEADLOCK error.
--echo #
create table t1 (i int);
--echo # Ensure that ALTER waits once it has acquired SNW lock.
set debug_sync='after_open_table_mdl_shared SIGNAL parked1 WAIT_FOR go1';
--echo # Sending:
--send alter table t1 add column j int
--echo #
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
--echo # Wait till ALTER acquires SNW lock and stops.
set debug_sync='now WAIT_FOR parked1';
--echo # Ensure that INSERT is paused once it detects that there is
--echo # a conflicting metadata lock so it has to wait, but before
--echo # deadlock detection is run.
set debug_sync='mdl_acquire_lock_wait SIGNAL parked2 WAIT_FOR go2';
--echo # Sending:
--send insert into t1 values ()
--echo #
--echo # Switching to connection 'deadlock_con2'.
connection deadlock_con2;
--echo # Wait till INSERT is paused.
set debug_sync='now WAIT_FOR parked2';
--echo # Resume ALTER execution. Eventually it will release its
--echo # metadata lock and INSERT's request for SW lock will be
--echo # satisified.
set debug_sync='now SIGNAL go1';
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping ALTER TABLE.
--reap
--echo # Add a new request for SNW lock to waiting graph.
--echo # Sending:
--send alter table t1 drop column j
--echo #
--echo # Switching to connection 'deadlock_con2'.
connection deadlock_con2;
--echo # Wait until ALTER is blocked.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "alter table t1 drop column j";
--source include/wait_condition.inc
--echo # Resume INSERT so it can start deadlock detection.
--echo #
--echo # At this point there is a discrepancy between the fact that INSERT's
--echo # SW lock is already satisfied, but INSERT's connection is still
--echo # marked as waiting for it. Looking for a loop in waiters graph
--echo # without additional checks has detected a deadlock (INSERT waits
--echo # for SW lock; which is not granted because of pending SNW lock from
--echo # ALTER; which waits for active SW lock from INSERT). Since requests
--echo # for SW and SNW locks have same weight ALTER was selected as a victim
--echo # and ended with ER_LOCK_DEADLOCK error.
set debug_sync='now SIGNAL go2';
--echo #
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
--echo # Reaping INSERT.
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping ALTER. It should succeed and not produce ER_LOCK_DEADLOCK.
--reap
drop table t1;
--echo #
--echo # Now, test for a situation in which deadlock involves waiting not
--echo # only in MDL subsystem but also for TDC. Such deadlocks should be
--echo # successfully detected. If possible, they should be resolved without
--echo # resorting to ER_LOCK_DEADLOCK error.
--echo #
create table t1(i int);
create table t2(j int);
--echo #
--echo # First, let us check how we handle a simple scenario involving
--echo # waits in MDL and TDC.
--echo #
set debug_sync= 'RESET';
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
--echo # Start a statement, which will acquire SR metadata lock on t1, open it
--echo # and then stop, before trying to acquire SW lock on t2 and opening it.
set debug_sync='open_tables_after_open_and_process_table SIGNAL parked WAIT_FOR go';
--echo # Sending:
--send select * from t1 where i in (select j from t2 for update)
--echo # Switching to connection 'deadlock_con2'.
connection deadlock_con2;
--echo # Wait till the above SELECT stops.
set debug_sync='now WAIT_FOR parked';
--echo # The below FLUSH TABLES WITH READ LOCK should acquire
--echo # SNW locks on t1 and t2 and wait till SELECT closes t1.
--echo # Sending:
send flush tables t1, t2 with read lock;
--echo # Switching to connection 'deadlock_con3'.
connection deadlock_con3;
--echo # Wait until FLUSH TABLES WITH t1, t2 READ LOCK starts waiting
--echo # for SELECT to close t1.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table flush" and
info = "flush tables t1, t2 with read lock";
--source include/wait_condition.inc
--echo # Resume SELECT, so it tries to acquire SW lock on t1 and blocks,
--echo # creating a deadlock. This deadlock should be detected and resolved
--echo # by backing-off SELECT. As a result FTWRL should be able to finish.
set debug_sync='now SIGNAL go';
--echo # Switching to connection 'deadlock_con2'.
connection deadlock_con2;
--echo # Reap FLUSH TABLES WITH READ LOCK.
reap;
unlock tables;
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
--echo # Reap SELECT.
reap;
--echo #
--echo # The same scenario with a slightly different order of events
--echo # which emphasizes that setting correct deadlock detector weights
--echo # for flush waits is important.
--echo #
set debug_sync= 'RESET';
--echo # Switching to connection 'deadlock_con2'.
connection deadlock_con2;
set debug_sync='flush_tables_with_read_lock_after_acquire_locks SIGNAL parked WAIT_FOR go';
--echo # The below FLUSH TABLES WITH READ LOCK should acquire
--echo # SNW locks on t1 and t2 and wait on debug sync point.
--echo # Sending:
send flush tables t1, t2 with read lock;
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
--echo # Wait till FLUSH TABLE WITH READ LOCK stops.
set debug_sync='now WAIT_FOR parked';
--echo # Start statement which will acquire SR metadata lock on t1, open
--echo # it and then will block while trying to acquire SW lock on t2.
--echo # Sending:
send select * from t1 where i in (select j from t2 for update);
--echo # Switching to connection 'deadlock_con3'.
connection deadlock_con3;
--echo # Wait till the above SELECT blocks.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "select * from t1 where i in (select j from t2 for update)";
--source include/wait_condition.inc
--echo # Resume FLUSH TABLES, so it tries to flush t1, thus creating
--echo # a deadlock. This deadlock should be detected and resolved by
--echo # backing-off SELECT. As a result FTWRL should be able to finish.
set debug_sync='now SIGNAL go';
--echo # Switching to connection 'deadlock_con2'.
connection deadlock_con2;
--echo # Reap FLUSH TABLES WITH READ LOCK.
reap;
unlock tables;
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
--echo # Reap SELECT.
reap;
--echo #
--echo # Now a more complex scenario involving two connections
--echo # waiting for MDL and one for TDC.
--echo #
set debug_sync= 'RESET';
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
--echo # Start a statement which will acquire SR metadata lock on t2, open it
--echo # and then stop, before trying to acquire SR on t1 and opening it.
set debug_sync='open_tables_after_open_and_process_table SIGNAL parked WAIT_FOR go';
--echo # Sending:
send select * from t2, t1;
--echo # Switching to connection 'deadlock_con2'.
connection deadlock_con2;
--echo # Wait till the above SELECT stops.
set debug_sync='now WAIT_FOR parked';
--echo # The below FLUSH TABLES WITH READ LOCK should acquire
--echo # SNW locks on t2 and wait till SELECT closes t2.
--echo # Sending:
send flush tables t2 with read lock;
--echo # Switching to connection 'deadlock_con3'.
connection deadlock_con3;
--echo # Wait until FLUSH TABLES WITH READ LOCK starts waiting
--echo # for SELECT to close t2.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table flush" and
info = "flush tables t2 with read lock";
--source include/wait_condition.inc
--echo # The below DROP TABLES should acquire X lock on t1 and start
--echo # waiting for X lock on t2.
--echo # Sending:
send drop tables t1, t2;
--echo # Switching to connection 'default'.
connection default;
--echo # Wait until DROP TABLES starts waiting for X lock on t2.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "drop tables t1, t2";
--source include/wait_condition.inc
--echo # Resume SELECT, so it tries to acquire SR lock on t1 and blocks,
--echo # creating a deadlock. This deadlock should be detected and resolved
--echo # by backing-off SELECT. As a result, FTWRL should be able to finish.
set debug_sync='now SIGNAL go';
--echo # Switching to connection 'deadlock_con2'.
connection deadlock_con2;
--echo # Reap FLUSH TABLES WITH READ LOCK.
reap;
--echo # Unblock DROP TABLES.
unlock tables;
--echo # Switching to connection 'deadlock_con3'.
connection deadlock_con3;
--echo # Reap DROP TABLES.
reap;
--echo # Switching to connection 'deadlock_con1'.
connection deadlock_con1;
--echo # Reap SELECT. It should emit error about missing table.
--error ER_NO_SUCH_TABLE
reap;
--echo # Switching to connection 'default'.
connection default;
set debug_sync= 'RESET';
disconnect deadlock_con1;
disconnect deadlock_con2;
disconnect deadlock_con3;
--echo #
--echo # Test for a scenario in which FLUSH TABLES <list> WITH READ LOCK
--echo # used to erroneously release metadata locks.
--echo #
connect(con1,localhost,root,,);
connect(con2,localhost,root,,);
connection default;
--disable_warnings
drop tables if exists t1, t2;
--enable_warnings
set debug_sync= 'RESET';
create table t1(i int);
create table t2(j int);
--echo # Switching to connection 'con2'.
connection con2;
set debug_sync='open_tables_after_open_and_process_table SIGNAL parked WAIT_FOR go';
--echo # The below FLUSH TABLES <list> WITH READ LOCK should acquire
--echo # SNW locks on t1 and t2, open table t1 and block on the debug
--echo # sync point.
--echo # Sending:
send flush tables t1, t2 with read lock;
--echo # Switching to connection 'con1'.
connection con1;
--echo # Wait till FLUSH TABLES <list> WITH READ LOCK stops.
set debug_sync='now WAIT_FOR parked';
--echo # Start a statement which will flush all tables and thus
--echo # invalidate table t1 open by FLUSH TABLES <list> WITH READ LOCK.
--echo # Sending:
send flush tables;
--echo # Switching to connection 'default'.
connection default;
--echo # Wait till the above FLUSH TABLES blocks.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table flush" and
info = "flush tables";
--source include/wait_condition.inc
--echo # Resume FLUSH TABLES <list> WITH READ LOCK, so it tries to open t2
--echo # discovers that its t1 is obsolete and tries to reopen all tables.
--echo # Such reopen should not cause releasing of SNW metadata locks
--echo # which would result in assertion failures.
set debug_sync='now SIGNAL go';
--echo # Switching to connection 'con2'.
connection con2;
--echo # Reap FLUSH TABLES <list> WITH READ LOCK.
reap;
unlock tables;
--echo # Switching to connection 'con1'.
connection con1;
--echo # Reap FLUSH TABLES.
reap;
--echo # Clean-up.
--echo # Switching to connection 'default'.
connection default;
drop tables t1, t2;
set debug_sync= 'RESET';
disconnect con1;
disconnect con2;
--echo #
--echo # Test for bug #46748 "Assertion in MDL_context::wait_for_locks()
--echo # on INSERT + CREATE TRIGGER".
--echo #
--disable_warnings
drop tables if exists t1, t2, t3, t4, t5;
--enable_warnings
--echo # Let us simulate scenario in which we open some tables from extended
--echo # part of prelocking set but then encounter conflicting metadata lock,
--echo # so have to back-off and wait for it to go away.
connect (con1root,localhost,root,,test,,);
connect (con2root,localhost,root,,test,,);
connection default;
create table t1 (i int);
create table t2 (j int);
create table t3 (k int);
create table t4 (l int);
create trigger t1_bi before insert on t1 for each row
insert into t2 values (new.i);
create trigger t2_bi before insert on t2 for each row
insert into t3 values (new.j);
--echo #
--echo # Switching to connection 'con1root'.
connection con1root;
lock tables t4 read;
--echo #
--echo # Switching to connection 'con2root'.
connection con2root;
--echo # Send :
--send rename table t3 to t5, t4 to t3;
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Wait until the above RENAME TABLE adds pending requests for exclusive
--echo # metadata lock on its tables and blocks due to 't4' being used by LOCK
--echo # TABLES.
let $wait_condition= select count(*)= 1 from information_schema.processlist
where state= 'Waiting for table metadata lock' and
info='rename table t3 to t5, t4 to t3';
--source include/wait_condition.inc
--echo # Send :
--send insert into t1 values (1);
--echo #
--echo # Switching to connection 'con1root'.
connection con1root;
--echo # Wait until INSERT statement waits due to encountering pending
--echo # exclusive metadata lock on 't3'.
let $wait_condition= select count(*)= 1 from information_schema.processlist
where state= 'Waiting for table metadata lock' and
info='insert into t1 values (1)';
--source include/wait_condition.inc
unlock tables;
--echo #
--echo # Switching to connection 'con2root'.
connection con2root;
--echo # Reap RENAME TABLE.
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Reap INSERT.
--reap
--echo # Clean-up.
disconnect con1root;
disconnect con2root;
drop tables t1, t2, t3, t5;
--echo #
--echo # Bug#42546 - Backup: RESTORE fails, thinking it finds an existing table
--echo #
--disable_warnings
DROP TABLE IF EXISTS t1;
--enable_warnings
set @save_log_output=@@global.log_output;
set global log_output=file;
connect(con2, localhost, root,,);
--echo #
--echo # Test 1: CREATE TABLE
--echo #
--echo # Connection 2
connection con2;
--echo # Start insert on the not-yet existing table
--echo # Wait after taking the MDL lock
SET DEBUG_SYNC= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
--send INSERT INTO t1 VALUES(1,"def")
--echo # Connection 1
connection default;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
--echo # Now INSERT has a MDL on the non-existent table t1.
--echo #
--echo # Continue the INSERT once CREATE waits for exclusive lock
SET DEBUG_SYNC= 'mdl_acquire_lock_wait SIGNAL finish';
--echo # Try to create that table.
--send CREATE TABLE t1 (c1 INT, c2 VARCHAR(100), KEY(c1))
--echo # Connection 2
--echo # Insert fails
connection con2;
--error ER_NO_SUCH_TABLE
--reap
--echo # Connection 1
connection default;
--reap;
SET DEBUG_SYNC= 'RESET';
SHOW TABLES;
--disable_warnings
DROP TABLE IF EXISTS t1;
--enable_warnings
--echo #
--echo # Test 2: CREATE TABLE LIKE
--echo #
CREATE TABLE t2 (c1 INT, c2 VARCHAR(100), KEY(c1));
--echo # Connection 2
connection con2;
--echo # Start insert on the not-yet existing table
--echo # Wait after taking the MDL
SET DEBUG_SYNC= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
--send INSERT INTO t1 VALUES(1,"def")
--echo # Connection 1
connection default;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
--echo # Now INSERT has a MDL on the non-existent table t1.
--echo #
--echo # Continue the INSERT once CREATE waits for exclusive lock
SET DEBUG_SYNC= 'mdl_acquire_lock_wait SIGNAL finish';
--echo # Try to create that table.
--send CREATE TABLE t1 LIKE t2
--echo # Connection 2
--echo # Insert fails
connection con2;
--error ER_NO_SUCH_TABLE
--reap
--echo # Connection 1
connection default;
--reap
SET DEBUG_SYNC= 'RESET';
SHOW TABLES;
DROP TABLE t2;
disconnect con2;
--disable_warnings
DROP TABLE IF EXISTS t1;
--enable_warnings
set global log_output=@save_log_output;
--echo #
--echo # Bug #46044 "MDL deadlock on LOCK TABLE + CREATE TABLE HIGH_PRIORITY
--echo # FOR UPDATE"
--echo #
--disable_warnings
drop tables if exists t1, t2;
--enable_warnings
connect (con46044, localhost, root,,);
connect (con46044_2, localhost, root,,);
connection default;
create table t1 (i int);
--echo # Let us check that we won't deadlock if during filling
--echo # of I_S table we encounter conflicting metadata lock
--echo # which owner is in its turn waiting for our connection.
lock tables t1 read;
--echo # Switching to connection 'con46044'.
connection con46044;
--echo # Sending:
--send create table t2 select * from t1 for update;
--echo # Switching to connection 'default'.
connection default;
--echo # Waiting until CREATE TABLE ... SELECT ... is blocked.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table level lock" and
info = "create table t2 select * from t1 for update";
--source include/wait_condition.inc
--echo # First let us check that SHOW FIELDS/DESCRIBE doesn't
--echo # gets blocked and emits and error.
--error ER_WARN_I_S_SKIPPED_TABLE
show fields from t2;
--echo # Now test for I_S query which reads only .FRMs.
--echo #
--echo # Query below should only emit a warning.
select column_name from information_schema.columns
where table_schema='test' and table_name='t2';
--echo # Finally, test for I_S query which does full-blown table open.
--echo #
--echo # Query below should not be blocked. Warning message should be
--echo # stored in the 'table_comment' column.
select table_name, table_type, auto_increment, table_comment
from information_schema.tables where table_schema='test' and table_name='t2';
--echo # Switching to connection 'default'.
connection default;
unlock tables;
--echo # Switching to connection 'con46044'.
connection con46044;
--echo # Reaping CREATE TABLE ... SELECT ... .
--reap
drop table t2;
--echo #
--echo # Let us also check that queries to I_S wait for conflicting metadata
--echo # locks to go away instead of skipping table with a warning in cases
--echo # when deadlock is not possible. This is a nice thing from compatibility
--echo # and ease of use points of view.
--echo #
--echo # We check same three queries to I_S in this new situation.
--echo # Switching to connection 'con46044_2'.
connection con46044_2;
lock tables t1 read;
--echo # Switching to connection 'con46044'.
connection con46044;
--echo # Sending:
--send create table t2 select * from t1 for update;
--echo # Switching to connection 'default'.
connection default;
--echo # Waiting until CREATE TABLE ... SELECT ... is blocked.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table level lock" and
info = "create table t2 select * from t1 for update";
--source include/wait_condition.inc
--echo # Let us check that SHOW FIELDS/DESCRIBE gets blocked.
--echo # Sending:
--send show fields from t2;
--echo # Switching to connection 'con46044_2'.
connection con46044_2;
--echo # Wait until SHOW FIELDS gets blocked.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "show fields from t2";
--source include/wait_condition.inc
unlock tables;
--echo # Switching to connection 'con46044'.
connection con46044;
--echo # Reaping CREATE TABLE ... SELECT ... .
--reap
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping SHOW FIELDS ...
--reap
drop table t2;
--echo # Switching to connection 'con46044_2'.
connection con46044_2;
lock tables t1 read;
--echo # Switching to connection 'con46044'.
connection con46044;
--echo # Sending:
--send create table t2 select * from t1 for update;
--echo # Switching to connection 'default'.
connection default;
--echo # Waiting until CREATE TABLE ... SELECT ... is blocked.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table level lock" and
info = "create table t2 select * from t1 for update";
--source include/wait_condition.inc
--echo # Check that I_S query which reads only .FRMs gets blocked.
--echo # Sending:
--send select column_name from information_schema.columns where table_schema='test' and table_name='t2';
--echo # Switching to connection 'con46044_2'.
connection con46044_2;
--echo # Wait until SELECT COLUMN_NAME FROM I_S.COLUMNS gets blocked.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info like "select column_name from information_schema.columns%";
--source include/wait_condition.inc
unlock tables;
--echo # Switching to connection 'con46044'.
connection con46044;
--echo # Reaping CREATE TABLE ... SELECT ... .
--reap
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping SELECT COLUMN_NAME FROM I_S.COLUMNS
--reap
drop table t2;
--echo # Switching to connection 'con46044_2'.
connection con46044_2;
lock tables t1 read;
--echo # Switching to connection 'con46044'.
connection con46044;
--echo # Sending:
--send create table t2 select * from t1 for update;
--echo # Switching to connection 'default'.
connection default;
--echo # Waiting until CREATE TABLE ... SELECT ... is blocked.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table level lock" and
info = "create table t2 select * from t1 for update";
--source include/wait_condition.inc
--echo # Finally, check that I_S query which does full-blown table open
--echo # also gets blocked.
--echo # Sending:
--send select table_name, table_type, auto_increment, table_comment from information_schema.tables where table_schema='test' and table_name='t2';
--echo # Switching to connection 'con46044_2'.
connection con46044_2;
--echo # Wait until SELECT ... FROM I_S.TABLES gets blocked.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info like "select table_name, table_type, auto_increment, table_comment from information_schema.tables%";
--source include/wait_condition.inc
unlock tables;
--echo # Switching to connection 'con46044'.
connection con46044;
--echo # Reaping CREATE TABLE ... SELECT ... .
--reap
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping SELECT ... FROM I_S.TABLES
--reap
drop table t2;
--echo # Switching to connection 'default'.
connection default;
--echo # Clean-up.
disconnect con46044;
disconnect con46044_2;
drop table t1;
--echo #
--echo # Test for bug #46273 "MySQL 5.4.4 new MDL: Bug#989 is not fully fixed
--echo # in case of ALTER".
--echo #
--disable_warnings
drop table if exists t1;
--enable_warnings
set debug_sync= 'RESET';
connect (con46273,localhost,root,,test,,);
connection default;
create table t1 (c1 int primary key, c2 int, c3 int);
insert into t1 values (1,1,0),(2,2,0),(3,3,0),(4,4,0),(5,5,0);
begin;
select * from t1 where c2 = 3;
--echo #
--echo # Switching to connection 'con46273'.
connection con46273;
set debug_sync='after_lock_tables_takes_lock SIGNAL alter_table_locked WAIT_FOR alter_go';
--send alter table t1 add column e int, rename to t2;
--echo #
--echo # Switching to connection 'default'.
connection default;
set debug_sync='now WAIT_FOR alter_table_locked';
set debug_sync='mdl_acquire_lock_wait SIGNAL alter_go';
--echo # The below statement should get ER_LOCK_DEADLOCK error
--echo # (i.e. it should not allow ALTER to proceed, and then
--echo # fail due to 't1' changing its name to 't2').
--error ER_LOCK_DEADLOCK
update t1 set c3=c3+1 where c2 = 3;
--echo #
--echo # Switching to connection 'con46273'.
connection con46273;
--echo # Reap ALTER TABLE.
--reap
--echo #
--echo # Switching to connection 'default'.
connection default;
disconnect con46273;
--echo # Clean-up.
set debug_sync= 'RESET';
drop table t2;
--echo #
--echo # Test for bug #46673 "Deadlock between FLUSH TABLES WITH READ LOCK
--echo # and DML".
--echo #
--disable_warnings
drop tables if exists t1;
--enable_warnings
connect (con46673, localhost, root,,);
connection default;
create table t1 (i int);
--echo # Switching to connection 'con46673'.
connection con46673;
begin;
insert into t1 values (1);
--echo # Switching to connection 'default'.
connection default;
--echo # Statement below should not get blocked. And if after some
--echo # changes to code it is there should not be a deadlock between
--echo # it and transaction from connection 'con46673'.
flush tables with read lock;
unlock tables;
--echo # Switching to connection 'con46673'.
connection con46673;
delete from t1 where i = 1;
commit;
--echo # Switching to connection 'default'.
connection default;
--echo # Clean-up
disconnect con46673;
drop table t1;
--echo #
--echo # Bug#48210 FLUSH TABLES WITH READ LOCK deadlocks
--echo # against concurrent CREATE PROCEDURE
--echo #
connect (con2, localhost, root);
--echo # Test 1: CREATE PROCEDURE
--echo # Connection 1
connection default;
--echo # Start CREATE PROCEDURE and open mysql.proc
SET DEBUG_SYNC= 'after_open_table_mdl_shared SIGNAL table_opened WAIT_FOR grlwait';
--send CREATE PROCEDURE p1() SELECT 1
--echo # Connection 2
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR table_opened';
--echo # Check that FLUSH must wait to get the GRL
--echo # and let CREATE PROCEDURE continue
SET DEBUG_SYNC= 'mdl_acquire_lock_wait SIGNAL grlwait';
--send FLUSH TABLES WITH READ LOCK
--echo # Connection 1
connection default;
--reap
--echo # Connection 2
connection con2;
--reap
UNLOCK TABLES;
--echo # Connection 1
connection default;
SET DEBUG_SYNC= 'RESET';
--echo # Test 2: DROP PROCEDURE
connection default;
--echo # Start DROP PROCEDURE and open tables
SET DEBUG_SYNC= 'after_open_table_mdl_shared SIGNAL table_opened WAIT_FOR grlwait';
--send DROP PROCEDURE p1
--echo # Connection 2
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR table_opened';
--echo # Check that FLUSH must wait to get the GRL
--echo # and let DROP PROCEDURE continue
SET DEBUG_SYNC= 'mdl_acquire_lock_wait SIGNAL grlwait';
--send FLUSH TABLES WITH READ LOCK
--echo # Connection 1
connection default;
--echo # Once FLUSH TABLES WITH READ LOCK starts waiting
--echo # DROP PROCEDURE will be waked up and will drop
--echo # procedure. Global read lock will be granted after
--echo # this statement ends.
--echo #
--echo # Reaping DROP PROCEDURE.
--reap
--echo # Connection 2
connection con2;
--echo # Reaping FTWRL.
--reap
UNLOCK TABLES;
--echo # Connection 1
connection default;
SET DEBUG_SYNC= 'RESET';
disconnect con2;
--echo #
--echo # Bug#50786 Assertion `thd->mdl_context.trans_sentinel() == __null'
--echo # failed in open_ltable()
--echo #
--echo # Supress warnings written to the log file
call mtr.add_suppression("Wait on a lock was aborted due to a pending exclusive lock");
--disable_warnings
DROP TABLE IF EXISTS t1, t2;
--enable_warnings
connect (con1,localhost,root);
connect (con2,localhost,root);
connect (con3,localhost,root);
connection default;
CREATE TABLE t1 (i INT);
CREATE TABLE t2 (i INT);
SET @old_general_log= @@global.general_log;
SET @@global.general_log= 1;
SET @old_log_output= @@global.log_output;
SET @@global.log_output= 'TABLE';
SET @old_sql_log_off= @@session.sql_log_off;
SET @@session.sql_log_off= 1;
--echo # connection: con1
connection con1;
HANDLER t1 OPEN;
--echo # connection: con3
connection con3;
SET @@session.sql_log_off= 1;
--echo # connection: con2
connection con2;
SET DEBUG_SYNC= 'thr_multi_lock_after_thr_lock SIGNAL parked WAIT_FOR go';
# The below statement will block on the debug sync point
# after it gets write lock on mysql.general_log table.
--echo # Sending:
--send SELECT 1
--echo # connection: con3
connection con3;
SET DEBUG_SYNC= 'now WAIT_FOR parked';
--echo # connection: con1
connection con1;
# This statement will block in open_ltable() when
# trying to write into mysql.general_log.
--echo # Sending:
--send SELECT 1
--echo # connection: con3
connection con3;
let $wait_condition=
SELECT COUNT(*) = 1 FROM information_schema.processlist
WHERE state = "Waiting for table level lock" and info = "SELECT 1";
--source include/wait_condition.inc
# The ALTER below will try to abort the statement in connection con1,
# since the latter waits on a table-level lock while having a HANDLER
# open. This will cause mysql_lock_tables() in con1 fail which before
# triggered the assert.
ALTER TABLE t1 ADD COLUMN j INT;
--echo # connection: default
connection default;
SET DEBUG_SYNC= 'now SIGNAL go';
--echo # connection: con1
connection con1;
--echo # Reaping SELECT 1
--reap
HANDLER t1 CLOSE;
--echo # connection: con2
connection con2;
--echo # Reaping SELECT 1
--reap
--echo # connection: default
connection default;
DROP TABLE t1, t2;
SET DEBUG_SYNC= 'RESET';
disconnect con1;
disconnect con2;
disconnect con3;
SET @@global.general_log= @old_general_log;
SET @@global.log_output= @old_log_output;
SET @@session.sql_log_off= @old_sql_log_off;
--echo #
--echo # Additional coverage for bug #50913 "Deadlock between
--echo # open_and_lock_tables_derived and MDL". The main test
--echo # case is in lock_multi.test
--echo #
--disable_warnings
drop table if exists t1;
--enable_warnings
set debug_sync= 'RESET';
connect (con50913_1,localhost,root);
connect (con50913_2,localhost,root);
connection default;
create table t1 (i int) engine=InnoDB;
--echo # Switching to connection 'con50913_1'.
connection con50913_1;
set debug_sync= 'thr_multi_lock_after_thr_lock SIGNAL parked WAIT_FOR go';
--echo # Sending:
--send alter table t1 add column j int
--echo # Switching to connection 'default'.
connection default;
--echo # Wait until ALTER TABLE gets blocked on a sync point after
--echo # acquiring thr_lock.c lock.
set debug_sync= 'now WAIT_FOR parked';
--echo # The below statement should wait on MDL lock and not deadlock on
--echo # thr_lock.c lock.
--echo # Sending:
--send truncate table t1
--echo # Switching to connection 'con50913_2'.
connection con50913_2;
--echo # Wait until TRUNCATE TABLE is blocked on MDL lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "truncate table t1";
--source include/wait_condition.inc
--echo # Unblock ALTER TABLE.
set debug_sync= 'now SIGNAL go';
--echo # Switching to connection 'con50913_1'.
connection con50913_1;
--echo # Reaping ALTER TABLE.
--reap
--echo # Switching to connection 'default'.
connection default;
--echo # Reaping TRUNCATE TABLE.
--reap
disconnect con50913_1;
disconnect con50913_2;
set debug_sync= 'RESET';
drop table t1;
--echo #
--echo # Test for bug #50998 "Deadlock in MDL code during test
--echo # rqg_mdl_stability".
--echo # Also provides coverage for the case when addition of
--echo # waiting statement adds several loops in the waiters
--echo # graph and therefore several searches for deadlock
--echo # should be performed.
--disable_warnings
drop table if exists t1;
--enable_warnings
set debug_sync= 'RESET';
connect (con1,localhost,root);
connect (con2,localhost,root);
connect (con3,localhost,root);
connection default;
create table t1 (i int);
--echo # Switching to connection 'con1'.
connection con1;
begin;
select * from t1;
--echo # Switching to connection 'con2'.
connection con2;
begin;
select * from t1;
--echo # Switching to connection 'default'.
connection default;
--echo # Start ALTER TABLE which will acquire SNW lock and
--echo # table lock and get blocked on sync point.
set debug_sync= 'thr_multi_lock_after_thr_lock SIGNAL parked WAIT_FOR go';
--echo # Sending:
--send alter table t1 add column j int
--echo # Switching to connection 'con1'.
connection con1;
--echo # Wait until ALTER TABLE gets blocked on a sync point.
set debug_sync= 'now WAIT_FOR parked';
--echo # Sending:
--send insert into t1 values (1)
--echo # Switching to connection 'con2'.
connection con2;
--echo # Sending:
--send insert into t1 values (1)
--echo # Switching to connection 'con3'.
connection con3;
--echo # Wait until both 'con1' and 'con2' are blocked trying to acquire
--echo # SW lock on the table.
let $wait_condition=
select count(*) = 2 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "insert into t1 values (1)";
--source include/wait_condition.inc
--echo # Unblock ALTER TABLE. Since it will try to upgrade SNW to X lock
--echo # deadlock with two loops in waiting graph will occur. Both loops
--echo # should be found and DML statements in both 'con1' and 'con2'
--echo # should be aborted with ER_LOCK_DEADLOCK errors.
set debug_sync= 'now SIGNAL go';
--echo # Switching to connection 'con1'.
connection con1;
--echo # Reaping INSERT. It should end with ER_LOCK_DEADLOCK error and
--echo # not wait indefinitely (as it happened before the bugfix).
--error ER_LOCK_DEADLOCK
--reap
commit;
--echo # Switching to connection 'con2'.
connection con2;
--echo # Reaping INSERT.
--error ER_LOCK_DEADLOCK
--reap
commit;
--echo # Switching to connection 'default'.
connection default;
--echo # Reap ALTER TABLE.
--reap
disconnect con1;
disconnect con2;
disconnect con3;
connection default;
set debug_sync= 'RESET';
drop table t1;
--echo #
--echo # Bug#42643: InnoDB does not support replication of TRUNCATE TABLE
--echo #
--echo # Ensure that a acquired lock is not given up due to a conflict.
--echo #
connect (con1,localhost,root,,test,,);
connect (con2,localhost,root,,test,,);
connect (con3,localhost,root,,test,,);
connection default;
--disable_warnings
DROP TABLE IF EXISTS t1;
--enable_warnings
CREATE TABLE t1 (a INT) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1),(2),(3);
--echo # Connection: con1
connection con1;
LOCK TABLES t1 WRITE;
SET debug_sync='upgrade_lock_for_truncate SIGNAL parked_truncate WAIT_FOR go_truncate';
send TRUNCATE TABLE t1;
connection default;
--echo # Connection: default
SET debug_sync='now WAIT_FOR parked_truncate';
connection con2;
--echo # Connection: con2
SET debug_sync='after_open_table_ignore_flush SIGNAL parked_show WAIT_FOR go_show';
send SHOW FIELDS FROM t1;
connection default;
--echo # Connection: default
SET debug_sync='now WAIT_FOR parked_show';
connection con3;
--echo # Connection: con3
SET debug_sync='after_flush_unlock SIGNAL parked_flush WAIT_FOR go_flush';
send FLUSH TABLES t1;
connection default;
--echo # Connection: default
SET debug_sync='now WAIT_FOR parked_flush';
SET debug_sync='now SIGNAL go_truncate';
--echo # Ensure that truncate waits for a exclusive lock
let $wait_condition=SELECT COUNT(*)=1 FROM information_schema.processlist
WHERE state='Waiting for table metadata lock' AND info='TRUNCATE TABLE t1';
--source include/wait_condition.inc
SET debug_sync= 'now SIGNAL go_show';
connection con1;
--echo # Connection: con1 (TRUNCATE)
--echo # Reaping...
reap;
UNLOCK TABLES;
connection con2;
--echo # Connection: con2 (SHOW FIELDS FROM t1)
--echo # Reaping...
reap;
connection default;
--echo # Connection: default
SET debug_sync= 'now SIGNAL go_flush';
connection con3;
--echo # Connection: con3 (FLUSH TABLES t1)
--echo # Reaping...
reap;
disconnect con1;
disconnect con2;
disconnect con3;
connection default;
--echo # Connection: default
SET debug_sync= 'RESET';
DROP TABLE t1;
--echo #
--echo # Bug#52856 concurrent show columns or show full columns causes a crash!!!
--echo #
CREATE TABLE t1(a CHAR(255));
connect(con1, localhost, root);
SET DEBUG_SYNC= "get_schema_column SIGNAL waiting WAIT_FOR completed";
--send SHOW FULL COLUMNS FROM t1
connection default;
SET DEBUG_SYNC= "now WAIT_FOR waiting";
--replace_column 8 #
SHOW FULL COLUMNS FROM t1;
SET DEBUG_SYNC= "now SIGNAL completed";
--replace_column 8 #
connection con1;
--reap
connection default;
DROP TABLE t1;
disconnect con1;
--echo #
--echo # Tests for schema-scope locks
--echo #
--disable_warnings
DROP DATABASE IF EXISTS db1;
DROP DATABASE IF EXISTS db2;
--enable_warnings
connect (con2, localhost, root);
connect (con3, localhost, root);
--echo # Test 1:
--echo # CREATE DATABASE blocks database DDL on the same database, but
--echo # not database DDL on different databases. Tests X vs X lock.
--echo #
--echo # Connection default
connection default;
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
--echo # Sending:
--send CREATE DATABASE db1
--echo # Connection con2
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
--echo # Sending:
# This should block.
--send CREATE DATABASE db1
--echo # Connection con3
connection con3;
let $wait_condition=SELECT COUNT(*)=1 FROM information_schema.processlist
WHERE state='Waiting for schema metadata lock' AND info='CREATE DATABASE db1';
--source include/wait_condition.inc
# This should not block.
CREATE DATABASE db2;
ALTER DATABASE db2 DEFAULT CHARACTER SET utf8;
DROP DATABASE db2;
SET DEBUG_SYNC= 'now SIGNAL blocked';
--echo # Connection default
connection default;
--echo # Reaping: CREATE DATABASE db1
--reap
--echo # Connection con2
connection con2;
--echo # Reaping: CREATE DATABASE db1
--error ER_DB_CREATE_EXISTS
--reap
--echo # Test 2:
--echo # ALTER DATABASE blocks database DDL on the same database, but
--echo # not database DDL on different databases. Tests X vs X lock.
--echo #
--echo # Connection default
connection default;
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
--echo # Sending:
--send ALTER DATABASE db1 DEFAULT CHARACTER SET utf8
--echo # Connection con2
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
--echo # Sending:
# This should block.
--send ALTER DATABASE db1 DEFAULT CHARACTER SET utf8
--echo # Connection con3
connection con3;
let $wait_condition=SELECT COUNT(*)=1 FROM information_schema.processlist
WHERE state='Waiting for schema metadata lock'
AND info='ALTER DATABASE db1 DEFAULT CHARACTER SET utf8';
--source include/wait_condition.inc
# This should not block.
CREATE DATABASE db2;
ALTER DATABASE db2 DEFAULT CHARACTER SET utf8;
DROP DATABASE db2;
SET DEBUG_SYNC= 'now SIGNAL blocked';
--echo # Connection default
connection default;
--echo # Reaping: ALTER DATABASE db1 DEFAULT CHARACTER SET utf8
--reap
--echo # Connection con2
connection con2;
--echo # Reaping: ALTER DATABASE db1 DEFAULT CHARACTER SET utf8
--reap
--echo # Connection default
connection default;
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
--echo # Sending:
--send ALTER DATABASE db1 DEFAULT CHARACTER SET utf8
--echo # Connection con2
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
--echo # Sending:
# This should also block.
--send DROP DATABASE db1
--echo # Connection con3
connection con3;
let $wait_condition=SELECT COUNT(*)=1 FROM information_schema.processlist
WHERE state='Waiting for schema metadata lock' AND info='DROP DATABASE db1';
--source include/wait_condition.inc
SET DEBUG_SYNC= 'now SIGNAL blocked';
--echo # Connection default
connection default;
--echo # Reaping: ALTER DATABASE db1 DEFAULT CHARACTER SET utf8
--reap
--echo # Connection con2
connection con2;
--echo # Reaping: DROP DATABASE db1
--reap
# Recreate the database
CREATE DATABASE db1;
--echo # Test 3:
--echo # Two ALTER..UPGRADE of the same database are mutually exclusive, but
--echo # two ALTER..UPGRADE of different databases are not. Tests X vs X lock.
--echo #
let $MYSQLD_DATADIR= `select @@datadir`;
# Manually make a 5.0 database from the template
--mkdir $MYSQLD_DATADIR/a-b-c
--copy_file $MYSQLD_DATADIR/db1/db.opt $MYSQLD_DATADIR/a-b-c/db.opt
--mkdir $MYSQLD_DATADIR/a-b-c-d
--copy_file $MYSQLD_DATADIR/db1/db.opt $MYSQLD_DATADIR/a-b-c-d/db.opt
--echo # Connection default
connection default;
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
--echo # Sending:
--send ALTER DATABASE `#mysql50#a-b-c` UPGRADE DATA DIRECTORY NAME
--echo # Connection con2
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
--echo # Sending:
# This should block.
--send ALTER DATABASE `#mysql50#a-b-c` UPGRADE DATA DIRECTORY NAME
--echo # Connection con3
connection con3;
let $wait_condition=SELECT COUNT(*)=1 FROM information_schema.processlist
WHERE state='Waiting for schema metadata lock'
AND info='ALTER DATABASE `#mysql50#a-b-c` UPGRADE DATA DIRECTORY NAME';
--source include/wait_condition.inc
# This should not block.
ALTER DATABASE `#mysql50#a-b-c-d` UPGRADE DATA DIRECTORY NAME;
SET DEBUG_SYNC= 'now SIGNAL blocked';
--echo # Connection default
connection default;
--echo # Reaping: ALTER DATABASE '#mysql50#a-b-c' UPGRADE DATA DIRECTORY NAME
--reap
--echo # Connection con2
connection con2;
--echo # Reaping: ALTER DATABASE '#mysql50#a-b-c' UPGRADE DATA DIRECTORY NAME
--error ER_BAD_DB_ERROR
--reap
DROP DATABASE `a-b-c`;
DROP DATABASE `a-b-c-d`;
--echo # Test 4:
--echo # DROP DATABASE blocks database DDL on the same database, but
--echo # not database DDL on different databases. Tests X vs X lock.
--echo #
--echo # Connection default
connection default;
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
--echo # Sending:
--send DROP DATABASE db1
--echo # Connection con2
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
--echo # Sending:
# This should block.
--send DROP DATABASE db1
--echo # Connection con3
connection con3;
let $wait_condition=SELECT COUNT(*)=1 FROM information_schema.processlist
WHERE state='Waiting for schema metadata lock' AND info='DROP DATABASE db1';
--source include/wait_condition.inc
# This should not block.
CREATE DATABASE db2;
ALTER DATABASE db2 DEFAULT CHARACTER SET utf8;
DROP DATABASE db2;
SET DEBUG_SYNC= 'now SIGNAL blocked';
--echo # Connection default
connection default;
--echo # Reaping: DROP DATABASE db1
--reap
--echo # Connection con2
connection con2;
--echo # Reaping: DROP DATABASE db1
--error ER_DB_DROP_EXISTS
--reap
--echo # Connection default
connection default;
CREATE DATABASE db1;
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
--echo # Sending:
--send DROP DATABASE db1
--echo # Connection con2
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
--echo # Sending:
# This should also block.
--send ALTER DATABASE db1 DEFAULT CHARACTER SET utf8
--echo # Connection con3
connection con3;
let $wait_condition=SELECT COUNT(*)=1 FROM information_schema.processlist
WHERE state='Waiting for schema metadata lock'
AND info='ALTER DATABASE db1 DEFAULT CHARACTER SET utf8';
--source include/wait_condition.inc
SET DEBUG_SYNC= 'now SIGNAL blocked';
--echo # Connection default
connection default;
--echo # Reaping: DROP DATABASE db1
--reap
--echo # Connection con2
connection con2;
--echo # Reaping: ALTER DATABASE db1 DEFAULT CHARACTER SET utf8
# Error 1 is from ALTER DATABASE when the database does not exist.
# Listing the error twice to prevent result diffences based on filename.
--error 1,1
--reap
--echo # Test 5:
--echo # Locked database name prevents CREATE of tables in that database.
--echo # Tests X vs IX lock.
--echo #
--echo # Connection default
connection default;
CREATE DATABASE db1;
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
--echo # Sending:
--send DROP DATABASE db1
--echo # Connection con2
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
--echo # Sending:
# This should block.
--send CREATE TABLE db1.t1 (a INT)
--echo # Connection con3
connection con3;
let $wait_condition=SELECT COUNT(*)=1 FROM information_schema.processlist
WHERE state='Waiting for schema metadata lock' AND
info='CREATE TABLE db1.t1 (a INT)';
--source include/wait_condition.inc
SET DEBUG_SYNC= 'now SIGNAL blocked';
--echo # Connection default
connection default;
--echo # Reaping: DROP DATABASE db1
--reap
--echo # Connection con2
connection con2;
--echo # Reaping: CREATE TABLE db1.t1 (a INT)
--error ER_BAD_DB_ERROR
--reap
--echo # Test 6:
--echo # Locked database name prevents RENAME of tables to/from that database.
--echo # Tests X vs IX lock.
--echo #
--echo # Connection default
connection default;
CREATE DATABASE db1;
CREATE TABLE db1.t1 (a INT);
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
--echo # Sending:
--send DROP DATABASE db1
--echo # Connection con2
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
--echo # Sending:
# This should block.
--send RENAME TABLE db1.t1 TO test.t1
--echo # Connection con3
connection con3;
let $wait_condition=SELECT COUNT(*)=1 FROM information_schema.processlist
WHERE state='Waiting for schema metadata lock' AND
info='RENAME TABLE db1.t1 TO test.t1';
--source include/wait_condition.inc
SET DEBUG_SYNC= 'now SIGNAL blocked';
--echo # Connection default
connection default;
--echo # Reaping: DROP DATABASE db1
--reap
--echo # Connection con2
connection con2;
--echo # Reaping: RENAME TABLE db1.t1 TO test.t1
--error ER_FILE_NOT_FOUND, ER_FILE_NOT_FOUND
--reap
--echo # Connection default
connection default;
CREATE DATABASE db1;
CREATE TABLE test.t2 (a INT);
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
--echo # Sending:
--send DROP DATABASE db1
--echo # Connection con2
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
--echo # Sending:
# This should block.
--send RENAME TABLE test.t2 TO db1.t2
--echo # Connection con3
connection con3;
let $wait_condition=SELECT COUNT(*)=1 FROM information_schema.processlist
WHERE state='Waiting for schema metadata lock' AND
info='RENAME TABLE test.t2 TO db1.t2';
--source include/wait_condition.inc
SET DEBUG_SYNC= 'now SIGNAL blocked';
--echo # Connection default
connection default;
--echo # Reaping: DROP DATABASE db1
--reap
--echo # Connection con2
connection con2;
--echo # Reaping: RENAME TABLE test.t2 TO db1.t2
# Error 7 is from RENAME TABLE where the target database does not exist.
# Listing the error twice to prevent result diffences based on filename.
--error 7, 7
--reap
DROP TABLE test.t2;
--echo # Test 7:
--echo # Locked database name prevents DROP of tables in that database.
--echo # Tests X vs IX lock.
--echo #
--echo # Connection default
connection default;
CREATE DATABASE db1;
CREATE TABLE db1.t1 (a INT);
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
--echo # Sending:
--send DROP DATABASE db1
--echo # Connection con2
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
--echo # Sending:
# This should block.
--send DROP TABLE db1.t1
--echo # Connection con3
connection con3;
let $wait_condition=SELECT COUNT(*)=1 FROM information_schema.processlist
WHERE state='Waiting for schema metadata lock' AND info='DROP TABLE db1.t1';
--source include/wait_condition.inc
SET DEBUG_SYNC= 'now SIGNAL blocked';
--echo # Connection default
connection default;
--echo # Reaping: DROP DATABASE db1
--reap
--echo # Connection con2
connection con2;
--echo # Reaping: DROP TABLE db1.t1
--error ER_BAD_TABLE_ERROR
--reap
--echo # Connection default
connection default;
disconnect con2;
disconnect con3;
SET DEBUG_SYNC= 'RESET';
--echo #
--echo # End of tests for schema-scope locks
--echo #
--echo #
--echo # Tests of granted global S lock (FLUSH TABLE WITH READ LOCK)
--echo #
CREATE DATABASE db1;
CREATE TABLE db1.t1(a INT);
connect(con2, localhost, root);
connect(con3, localhost, root);
--echo # Connection default
connection default;
FLUSH TABLE WITH READ LOCK;
--echo # Connection con2
connection con2;
# IX global lock should block
--send CREATE TABLE db1.t2(a INT)
--echo # Connection default
connection default;
let $wait_condition=SELECT COUNT(*)=1 FROM information_schema.processlist
WHERE state='Waiting for global read lock'
AND info='CREATE TABLE db1.t2(a INT)';
--source include/wait_condition.inc
UNLOCK TABLES;
--echo # Connection con2
connection con2;
--echo # Reaping CREATE TABLE db1.t2(a INT)
--reap
--echo # Connection default
connection default;
FLUSH TABLE WITH READ LOCK;
--echo # Connection con2
connection con2;
# X global lock should block
--send ALTER DATABASE db1 DEFAULT CHARACTER SET utf8
--echo # Connection default
connection default;
let $wait_condition=SELECT COUNT(*)=1 FROM information_schema.processlist
WHERE state='Waiting for global read lock'
AND info='ALTER DATABASE db1 DEFAULT CHARACTER SET utf8';
--source include/wait_condition.inc
UNLOCK TABLES;
--echo # Connection con2
connection con2;
--echo # Reaping ALTER DATABASE db1 DEFAULT CHARACTER SET utf8
--reap
--echo # Connection default
connection default;
FLUSH TABLE WITH READ LOCK;
--echo # Connection con2
connection con2;
# S global lock should not block
FLUSH TABLE WITH READ LOCK;
UNLOCK TABLES;
--echo # Connection default
connection default;
UNLOCK TABLES;
DROP DATABASE db1;
disconnect con2;
disconnect con3;
--echo #
--echo # Bug#56292 Deadlock with ALTER TABLE and MERGE tables
--echo #
--disable_warnings
DROP TABLE IF EXISTS t1, t2, m1;
--enable_warnings
CREATE TABLE t1(a INT) engine=MyISAM;
CREATE TABLE t2(a INT) engine=MyISAM;
CREATE TABLE m1(a INT) engine=MERGE UNION=(t1, t2);
INSERT INTO t1 VALUES (1), (2);
INSERT INTO t2 VALUES (3), (4);
connect(con1, localhost, root);
connect(con2, localhost, root);
--echo # Connection con1
connection con1;
SET DEBUG_SYNC= 'mdl_upgrade_shared_lock_to_exclusive SIGNAL upgrade WAIT_FOR continue';
--echo # Sending:
--send ALTER TABLE m1 engine=MERGE UNION=(t2, t1)
--echo # Connection con2
connection con2;
--echo # Waiting for ALTER TABLE to try lock upgrade
SET DEBUG_SYNC= 'now WAIT_FOR upgrade';
--echo # Sending:
--send DELETE FROM t2 WHERE a = 3
--echo # Connection default
connection default;
--echo # Check that DELETE is waiting on a metadata lock and not a table lock.
let $wait_condition=
SELECT COUNT(*) = 1 FROM information_schema.processlist
WHERE state = "Waiting for table metadata lock" AND
info = "DELETE FROM t2 WHERE a = 3";
--source include/wait_condition.inc
--echo # Now that DELETE blocks on a metadata lock, we should be able to do
--echo # SELECT * FROM m1 here. SELECT used to be blocked by a DELETE table
--echo # lock request.
SELECT * FROM m1;
--echo # Resuming ALTER TABLE
SET DEBUG_SYNC= 'now SIGNAL continue';
--echo # Connection con1
connection con1;
--echo # Reaping: ALTER TABLE m1 engine=MERGE UNION=(t2, t1)
--reap
--echo # Connection con2
connection con2;
--echo # Reaping: DELETE FROM t2 WHERE a = 3
--reap
--echo # Connection default
connection default;
DROP TABLE m1, t1, t2;
SET DEBUG_SYNC= 'RESET';
disconnect con1;
disconnect con2;
# Check that all connections opened by test cases in this file are really
# gone so execution of other tests won't be affected by their presence.
--source include/wait_until_count_sessions.inc
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