mirror of
https://github.com/MariaDB/server.git
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f229ac073a
rqg_mdl_stability". When start of statement's waiting on a metadata lock created more than one loop in waiters graph server might have entered deadlock condition. The problem was that in the case described above MDL deadlock detector had to perform several searches for deadlock but forgot to reset Deadlock_detection_context before performing new search. Failure to do so has broken assumption in code resposible for choosing victim that if Deadlock_detection_context::victim is set we also have read lock on m_waiting_for_lock for this context. As result this lock could have been unlocked more times than it was acquired which corrupted rwlock's state which led to server deadlock. This fix ensures that such reset is done before each attempt to find a deadlock.
2377 lines
64 KiB
Text
2377 lines
64 KiB
Text
SET DEBUG_SYNC= 'RESET';
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drop table if exists t1,t2,t3;
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create table t1 (i int);
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create table t2 (i int);
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connection: default
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lock tables t2 read;
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connection: con1
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set debug_sync='mdl_upgrade_shared_lock_to_exclusive SIGNAL parked WAIT_FOR go';
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alter table t1 rename t3;
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connection: default
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set debug_sync= 'now WAIT_FOR parked';
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connection: con2
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set debug_sync='mdl_acquire_lock_wait SIGNAL go';
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drop table t1,t2;
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connection: con1
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connection: default
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unlock tables;
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connection: con2
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ERROR 42S02: Unknown table 't1'
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drop table t3;
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SET DEBUG_SYNC= 'RESET';
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#
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# Basic test coverage for type-of-operation aware metadata locks.
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#
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drop table if exists t1, t2, t3;
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set debug_sync= 'RESET';
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create table t1 (c1 int);
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#
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# A) First let us check compatibility rules between differend kinds of
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# type-of-operation aware metadata locks.
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# Of course, these rules are already covered by the tests scattered
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# across the test suite. But it still makes sense to have one place
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# which covers all of them.
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#
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# 1) Acquire S (simple shared) lock on the table (by using HANDLER):
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#
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handler t1 open;
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#
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# Switching to connection 'mdl_con1'.
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# Check that S, SH, SR and SW locks are compatible with it.
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handler t1 open t;
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handler t close;
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select column_name from information_schema.columns where
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table_schema='test' and table_name='t1';
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column_name
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c1
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select count(*) from t1;
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count(*)
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0
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insert into t1 values (1), (1);
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# Check that SNW lock is compatible with it. To do this use ALTER TABLE
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# which will fail after opening the table and thus obtaining SNW metadata
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# lock.
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alter table t1 add primary key (c1);
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ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
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# Check that SNRW lock is compatible with S lock.
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lock table t1 write;
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insert into t1 values (1);
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unlock tables;
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# Check that X lock is incompatible with S lock.
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# Sending:
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rename table t1 to t2;;
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#
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# Switching to connection 'mdl_con2'.
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# Check that the above RENAME is blocked because of S lock.
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#
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# Switching to connection 'default'.
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# Unblock RENAME TABLE.
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handler t1 close;
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#
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# Switching to connection 'mdl_con1'.
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# Reaping RENAME TABLE.
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# Restore the original state of the things.
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rename table t2 to t1;
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#
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# Switching to connection 'default'.
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handler t1 open;
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#
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# Switching to connection 'mdl_con1'.
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# Check that upgrade from SNW to X is blocked by presence of S lock.
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# Sending:
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alter table t1 add column c2 int;;
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#
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# Switching to connection 'mdl_con2'.
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# Check that the above ALTER TABLE is blocked because of S lock.
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#
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# Switching to connection 'default'.
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# Unblock ALTER TABLE.
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handler t1 close;
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#
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# Switching to connection 'mdl_con1'.
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# Reaping ALTER TABLE.
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# Restore the original state of the things.
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alter table t1 drop column c2;
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#
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# Switching to connection 'default'.
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handler t1 open;
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#
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# Switching to connection 'mdl_con1'.
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# Check that upgrade from SNRW to X is blocked by presence of S lock.
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lock table t1 write;
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# Sending:
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alter table t1 add column c2 int;;
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#
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# Switching to connection 'mdl_con2'.
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# Check that the above upgrade of SNRW to X in ALTER TABLE is blocked
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# because of S lock.
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#
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# Switching to connection 'default'.
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# Unblock ALTER TABLE.
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handler t1 close;
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#
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# Switching to connection 'mdl_con1'.
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# Reaping ALTER TABLE.
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# Restore the original state of the things.
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alter table t1 drop column c2;
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unlock tables;
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#
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# Switching to connection 'default'.
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#
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# 2) Acquire SH (shared high-priority) lock on the table.
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# We have to involve DEBUG_SYNC facility for this as usually
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# such kind of locks are short-lived.
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#
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set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
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# Sending:
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select table_name, table_type, auto_increment, table_comment from information_schema.tables where table_schema='test' and table_name='t1';;
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#
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# Switching to connection 'mdl_con1'.
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set debug_sync= 'now WAIT_FOR locked';
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# Check that S, SH, SR and SW locks are compatible with it.
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handler t1 open;
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handler t1 close;
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select column_name from information_schema.columns where
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table_schema='test' and table_name='t1';
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column_name
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c1
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select count(*) from t1;
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count(*)
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3
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insert into t1 values (1);
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# Check that SNW lock is compatible with it. To do this use ALTER TABLE
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# which will fail after opening the table and thus obtaining SNW metadata
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# lock.
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alter table t1 add primary key (c1);
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ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
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# Check that SNRW lock is compatible with SH lock.
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lock table t1 write;
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delete from t1 limit 1;
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unlock tables;
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# Check that X lock is incompatible with SH lock.
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# Sending:
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rename table t1 to t2;;
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#
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# Switching to connection 'mdl_con2'.
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# Check that the above RENAME is blocked because of SH lock.
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# Unblock RENAME TABLE.
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set debug_sync= 'now SIGNAL finish';
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#
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# Switching to connection 'default'.
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# Reaping SELECT ... FROM I_S.
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table_name table_type auto_increment table_comment
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t1 BASE TABLE NULL
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#
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# Switching to connection 'mdl_con1'.
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# Reaping RENAME TABLE.
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# Restore the original state of the things.
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rename table t2 to t1;
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#
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# Switching to connection 'default'.
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set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
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# Sending:
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select table_name, table_type, auto_increment, table_comment from information_schema.tables where table_schema='test' and table_name='t1';;
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#
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# Switching to connection 'mdl_con1'.
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set debug_sync= 'now WAIT_FOR locked';
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# Check that upgrade from SNW to X is blocked by presence of SH lock.
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# Sending:
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alter table t1 add column c2 int;;
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#
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# Switching to connection 'mdl_con2'.
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# Check that the above ALTER TABLE is blocked because of SH lock.
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# Unblock RENAME TABLE.
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set debug_sync= 'now SIGNAL finish';
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#
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# Switching to connection 'default'.
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# Reaping SELECT ... FROM I_S.
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table_name table_type auto_increment table_comment
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t1 BASE TABLE NULL
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#
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# Switching to connection 'mdl_con1'.
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# Reaping ALTER TABLE.
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# Restore the original state of the things.
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alter table t1 drop column c2;
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#
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# Switching to connection 'default'.
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set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
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select table_name, table_type, auto_increment, table_comment from information_schema.tables where table_schema='test' and table_name='t1';;
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#
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# Switching to connection 'mdl_con1'.
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set debug_sync= 'now WAIT_FOR locked';
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# Check that upgrade from SNRW to X is blocked by presence of S lock.
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lock table t1 write;
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# Sending:
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alter table t1 add column c2 int;;
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#
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# Switching to connection 'mdl_con2'.
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# Check that the above upgrade of SNRW to X in ALTER TABLE is blocked
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# because of S lock.
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# Unblock RENAME TABLE.
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set debug_sync= 'now SIGNAL finish';
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#
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# Switching to connection 'default'.
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# Reaping SELECT ... FROM I_S.
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table_name table_type auto_increment table_comment
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t1 BASE TABLE NULL
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#
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# Switching to connection 'mdl_con1'.
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# Reaping ALTER TABLE.
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# Restore the original state of the things.
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alter table t1 drop column c2;
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unlock tables;
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#
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# Switching to connection 'default'.
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#
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#
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# 3) Acquire SR lock on the table.
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#
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#
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begin;
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select count(*) from t1;
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count(*)
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3
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#
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# Switching to connection 'mdl_con1'.
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# Check that S, SH, SR and SW locks are compatible with it.
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handler t1 open;
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handler t1 close;
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select column_name from information_schema.columns where
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table_schema='test' and table_name='t1';
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column_name
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c1
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select count(*) from t1;
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count(*)
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3
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insert into t1 values (1);
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# Check that SNW lock is compatible with it. To do this use ALTER TABLE
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# which will fail after opening the table and thus obtaining SNW metadata
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# lock.
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alter table t1 add primary key (c1);
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ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
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# Check that SNRW lock is not compatible with SR lock.
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# Sending:
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lock table t1 write;;
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#
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# Switching to connection 'default'.
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# Check that the above LOCK TABLES is blocked because of SR lock.
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# Unblock LOCK TABLES.
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commit;
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#
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# Switching to connection 'mdl_con1'.
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# Reaping LOCK TABLES.
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delete from t1 limit 1;
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unlock tables;
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#
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# Switching to connection 'default'.
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begin;
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select count(*) from t1;
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count(*)
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3
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#
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# Switching to connection 'mdl_con1'.
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# Check that X lock is incompatible with SR lock.
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# Sending:
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rename table t1 to t2;;
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#
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# Switching to connection 'mdl_con2'.
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# Check that the above RENAME is blocked because of SR lock.
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#
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# Switching to connection 'default'.
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# Unblock RENAME TABLE.
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commit;
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#
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# Switching to connection 'mdl_con1'.
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# Reaping RENAME TABLE.
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# Restore the original state of the things.
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rename table t2 to t1;
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#
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# Switching to connection 'default'.
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begin;
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select count(*) from t1;
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count(*)
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3
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#
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# Switching to connection 'mdl_con1'.
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# Check that upgrade from SNW to X is blocked by presence of SR lock.
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# Sending:
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alter table t1 add column c2 int;;
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#
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# Switching to connection 'mdl_con2'.
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# Check that the above ALTER TABLE is blocked because of SR lock.
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#
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# Switching to connection 'default'.
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# Unblock ALTER TABLE.
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commit;
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#
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# Switching to connection 'mdl_con1'.
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# Reaping ALTER TABLE.
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# Restore the original state of the things.
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alter table t1 drop column c2;
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#
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# There is no need to check that upgrade from SNRW to X is blocked
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# by presence of SR lock because SNRW is incompatible with SR anyway.
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#
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#
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# Switching to connection 'default'.
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#
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#
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# 4) Acquire SW lock on the table.
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#
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#
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begin;
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insert into t1 values (1);
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#
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# Switching to connection 'mdl_con1'.
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# Check that S, SH, SR and SW locks are compatible with it.
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handler t1 open;
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handler t1 close;
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select column_name from information_schema.columns where
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table_schema='test' and table_name='t1';
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column_name
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c1
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select count(*) from t1;
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count(*)
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4
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insert into t1 values (1);
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# Check that SNW lock is not compatible with SW lock.
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# Again we use ALTER TABLE which fails after opening
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# the table to avoid upgrade of SNW -> X.
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# Sending:
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alter table t1 add primary key (c1);;
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#
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# Switching to connection 'default'.
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# Check that the above ALTER TABLE is blocked because of SW lock.
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# Unblock ALTER TABLE.
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commit;
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#
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# Switching to connection 'mdl_con1'.
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# Reaping ALTER TABLE.
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ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
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#
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# Switching to connection 'default'.
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begin;
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insert into t1 values (1);
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#
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# Switching to connection 'mdl_con1'.
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# Check that SNRW lock is not compatible with SW lock.
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# Sending:
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lock table t1 write;;
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#
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# Switching to connection 'default'.
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# Check that the above LOCK TABLES is blocked because of SW lock.
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# Unblock LOCK TABLES.
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commit;
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#
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# Switching to connection 'mdl_con1'.
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# Reaping LOCK TABLES.
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delete from t1 limit 2;
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unlock tables;
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#
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# Switching to connection 'default'.
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begin;
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insert into t1 values (1);
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#
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# Switching to connection 'mdl_con1'.
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# Check that X lock is incompatible with SW lock.
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# Sending:
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rename table t1 to t2;;
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#
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# Switching to connection 'mdl_con2'.
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# Check that the above RENAME is blocked because of SW lock.
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#
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# Switching to connection 'default'.
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# Unblock RENAME TABLE.
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commit;
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#
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# Switching to connection 'mdl_con1'.
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# Reaping RENAME TABLE.
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# Restore the original state of the things.
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rename table t2 to t1;
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#
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# There is no need to check that upgrade from SNW/SNRW to X is
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# blocked by presence of SW lock because SNW/SNRW is incompatible
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# with SW anyway.
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#
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#
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# Switching to connection 'default'.
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#
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#
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# 5) Acquire SNW lock on the table. We have to use DEBUG_SYNC for
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# this, to prevent SNW from being immediately upgraded to X.
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#
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set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
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# Sending:
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alter table t1 add primary key (c1);;
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#
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# Switching to connection 'mdl_con1'.
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set debug_sync= 'now WAIT_FOR locked';
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# Check that S, SH and SR locks are compatible with it.
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handler t1 open;
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handler t1 close;
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select column_name from information_schema.columns where
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table_schema='test' and table_name='t1';
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column_name
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c1
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select count(*) from t1;
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count(*)
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5
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# Check that SW lock is incompatible with SNW lock.
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# Sending:
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delete from t1 limit 2;;
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#
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# Switching to connection 'mdl_con2'.
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# Check that the above DELETE is blocked because of SNW lock.
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# Unblock ALTER and thus DELETE.
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set debug_sync= 'now SIGNAL finish';
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#
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# Switching to connection 'default'.
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# Reaping ALTER TABLE.
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ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
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#
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# Switching to connection 'mdl_con1'.
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# Reaping DELETE.
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#
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# Switching to connection 'default'.
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set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
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# Sending:
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alter table t1 add primary key (c1);;
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#
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# Switching to connection 'mdl_con1'.
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set debug_sync= 'now WAIT_FOR locked';
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# Check that SNW lock is incompatible with SNW lock.
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# Sending:
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alter table t1 add primary key (c1);;
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#
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# Switching to connection 'mdl_con2'.
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# Check that the above ALTER is blocked because of SNW lock.
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# Unblock ALTERs.
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set debug_sync= 'now SIGNAL finish';
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#
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# Switching to connection 'default'.
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# Reaping first ALTER TABLE.
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ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
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#
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# Switching to connection 'mdl_con1'.
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# Reaping another ALTER TABLE.
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ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
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#
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# Switching to connection 'default'.
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set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
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# Sending:
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alter table t1 add primary key (c1);;
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#
|
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# Switching to connection 'mdl_con1'.
|
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set debug_sync= 'now WAIT_FOR locked';
|
|
# Check that SNRW lock is incompatible with SNW lock.
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|
# Sending:
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lock table t1 write;;
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|
#
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|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above LOCK TABLES is blocked because of SNW lock.
|
|
# Unblock ALTER and thus LOCK TABLES.
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|
set debug_sync= 'now SIGNAL finish';
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reaping ALTER TABLE.
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|
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping LOCK TABLES
|
|
insert into t1 values (1);
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'default'.
|
|
set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
|
|
# Sending:
|
|
alter table t1 add primary key (c1);;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
set debug_sync= 'now WAIT_FOR locked';
|
|
# Check that X lock is incompatible with SNW lock.
|
|
# Sending:
|
|
rename table t1 to t2;;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above RENAME is blocked because of SNW lock.
|
|
# Unblock ALTER and thus RENAME TABLE.
|
|
set debug_sync= 'now SIGNAL finish';
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reaping ALTER TABLE.
|
|
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping RENAME TABLE
|
|
# Revert back to original state of things.
|
|
rename table t2 to t1;
|
|
#
|
|
# There is no need to check that upgrade from SNW/SNRW to X is
|
|
# blocked by presence of another SNW lock because SNW/SNRW is
|
|
# incompatible with SNW anyway.
|
|
#
|
|
# Switching to connection 'default'.
|
|
#
|
|
#
|
|
# 6) Acquire SNRW lock on the table.
|
|
#
|
|
#
|
|
lock table t1 write;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# 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';
|
|
column_name
|
|
c1
|
|
# Check that SR lock is incompatible with SNRW lock.
|
|
# Sending:
|
|
select count(*) from t1;;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Check that the above SELECT is blocked because of SNRW lock.
|
|
# Unblock SELECT.
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping SELECT.
|
|
count(*)
|
|
4
|
|
#
|
|
# Switching to connection 'default'.
|
|
lock table t1 write;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that SW lock is incompatible with SNRW lock.
|
|
# Sending:
|
|
delete from t1 limit 1;;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Check that the above DELETE is blocked because of SNRW lock.
|
|
# Unblock DELETE.
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping DELETE.
|
|
#
|
|
# Switching to connection 'default'.
|
|
lock table t1 write;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that SNW lock is incompatible with SNRW lock.
|
|
# Sending:
|
|
alter table t1 add primary key (c1);;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Check that the above ALTER is blocked because of UNWR lock.
|
|
# Unblock ALTER.
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping ALTER TABLE.
|
|
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
|
|
#
|
|
# Switching to connection 'default'.
|
|
lock table t1 write;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that SNRW lock is incompatible with SNRW lock.
|
|
# Sending:
|
|
lock table t1 write;;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Check that the above LOCK TABLES is blocked because of SNRW lock.
|
|
# Unblock waiting LOCK TABLES.
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping LOCK TABLES
|
|
insert into t1 values (1);
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'default'.
|
|
lock table t1 write;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that X lock is incompatible with SNRW lock.
|
|
# Sending:
|
|
rename table t1 to t2;;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Check that the above RENAME is blocked because of SNRW lock.
|
|
# Unblock RENAME TABLE
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping RENAME TABLE
|
|
# Revert back to original state of things.
|
|
rename table t2 to t1;
|
|
#
|
|
# There is no need to check that upgrade from SNW/SNRW to X is
|
|
# blocked by presence of another SNRW lock because SNW/SNRW is
|
|
# incompatible with SNRW anyway.
|
|
#
|
|
# Switching to connection 'default'.
|
|
#
|
|
#
|
|
# 7) Now do the same round of tests for X lock. We use additional
|
|
# table to get long-lived lock of this type.
|
|
#
|
|
create table t2 (c1 int);
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Take a lock on t2, so RENAME TABLE t1 TO t2 will get blocked
|
|
# after acquiring X lock on t1.
|
|
lock tables t2 read;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Sending:
|
|
rename table t1 to t2;;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that RENAME has acquired X lock on t1 and is waiting for t2.
|
|
# Check that S lock in incompatible with X lock.
|
|
# Sending:
|
|
handler t1 open;;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above HANDLER statement is blocked because of X lock.
|
|
# Unblock RENAME TABLE
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reaping RENAME TABLE.
|
|
ERROR 42S01: Table 't2' already exists
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping HANDLER.
|
|
handler t1 close;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Prepare for blocking RENAME TABLE.
|
|
lock tables t2 read;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Sending:
|
|
rename table t1 to t2;;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that RENAME has acquired X lock on t1 and is waiting for t2.
|
|
# Check that SH lock in incompatible with X lock.
|
|
# Sending:
|
|
select column_name from information_schema.columns where table_schema='test' and table_name='t1';;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above SELECT ... FROM I_S ... statement is blocked
|
|
# because of X lock.
|
|
# Unblock RENAME TABLE
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reaping RENAME TABLE.
|
|
ERROR 42S01: Table 't2' already exists
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping SELECT ... FROM I_S.
|
|
column_name
|
|
c1
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Prepare for blocking RENAME TABLE.
|
|
lock tables t2 read;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Sending:
|
|
rename table t1 to t2;;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that RENAME has acquired X lock on t1 and is waiting for t2.
|
|
# Check that SR lock in incompatible with X lock.
|
|
# Sending:
|
|
select count(*) from t1;;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above SELECT statement is blocked
|
|
# because of X lock.
|
|
# Unblock RENAME TABLE
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reaping RENAME TABLE.
|
|
ERROR 42S01: Table 't2' already exists
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping SELECT.
|
|
count(*)
|
|
4
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Prepare for blocking RENAME TABLE.
|
|
lock tables t2 read;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Sending:
|
|
rename table t1 to t2;;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that RENAME has acquired X lock on t1 and is waiting for t2.
|
|
# Check that SW lock in incompatible with X lock.
|
|
# Sending:
|
|
delete from t1 limit 1;;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above DELETE statement is blocked
|
|
# because of X lock.
|
|
# Unblock RENAME TABLE
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reaping RENAME TABLE.
|
|
ERROR 42S01: Table 't2' already exists
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping DELETE.
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Prepare for blocking RENAME TABLE.
|
|
lock tables t2 read;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Sending:
|
|
rename table t1 to t2;;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that RENAME has acquired X lock on t1 and is waiting for t2.
|
|
# Check that SNW lock is incompatible with X lock.
|
|
# Sending:
|
|
alter table t1 add primary key (c1);;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above ALTER statement is blocked
|
|
# because of X lock.
|
|
# Unblock RENAME TABLE
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reaping RENAME TABLE
|
|
ERROR 42S01: Table 't2' already exists
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping ALTER.
|
|
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Prepare for blocking RENAME TABLE.
|
|
lock tables t2 read;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Sending:
|
|
rename table t1 to t2;;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that RENAME has acquired X lock on t1 and is waiting for t2.
|
|
# Check that SNRW lock is incompatible with X lock.
|
|
# Sending:
|
|
lock table t1 write;;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above LOCK TABLE statement is blocked
|
|
# because of X lock.
|
|
# Unblock RENAME TABLE
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reaping RENAME TABLE
|
|
ERROR 42S01: Table 't2' already exists
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping LOCK TABLE.
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Prepare for blocking RENAME TABLE.
|
|
lock tables t2 read;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Sending:
|
|
rename table t1 to t2;;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that RENAME has acquired X lock on t1 and is waiting for t2.
|
|
# Check that X lock is incompatible with X lock.
|
|
# Sending:
|
|
rename table t1 to t3;;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above RENAME statement is blocked
|
|
# because of X lock.
|
|
# Unblock RENAME TABLE
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reaping RENAME TABLE
|
|
ERROR 42S01: Table 't2' already exists
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping RENAME.
|
|
rename table t3 to t1;
|
|
#
|
|
# B) Now let us test compatibility in cases when both locks
|
|
# are pending. I.e. let us test rules for priorities between
|
|
# different types of metadata locks.
|
|
#
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
#
|
|
# 1) Check compatibility for pending SNW lock.
|
|
#
|
|
# Acquire SW lock in order to create pending SNW lock later.
|
|
begin;
|
|
insert into t1 values (1);
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Add pending SNW lock.
|
|
# Sending:
|
|
alter table t1 add primary key (c1);;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that ALTER TABLE is waiting with pending SNW lock.
|
|
# 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';
|
|
column_name
|
|
c1
|
|
select count(*) from t1;
|
|
count(*)
|
|
4
|
|
# Check that SW is incompatible with pending SNW
|
|
# Sending:
|
|
delete from t1 limit 1;;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above DELETE is blocked because of pending SNW lock.
|
|
# Unblock ALTER TABLE.
|
|
commit;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reaping ALTER.
|
|
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping DELETE.
|
|
#
|
|
# We can't do similar check for SNW, SNRW and X locks because
|
|
# they will also be blocked by active SW lock.
|
|
#
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
#
|
|
# 2) Check compatibility for pending SNRW lock.
|
|
#
|
|
# Acquire SR lock in order to create pending SNRW lock.
|
|
begin;
|
|
select count(*) from t1;
|
|
count(*)
|
|
3
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Add pending SNRW lock.
|
|
# Sending:
|
|
lock table t1 write;;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that LOCK TABLE is waiting with pending SNRW lock.
|
|
# 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';
|
|
column_name
|
|
c1
|
|
# Check that SR is incompatible with pending SNRW
|
|
# Sending:
|
|
select count(*) from t1;;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above SELECT is blocked because of pending SNRW lock.
|
|
# Unblock LOCK TABLE.
|
|
commit;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reaping LOCK TABLE.
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping SELECT.
|
|
count(*)
|
|
3
|
|
# Restore pending SNRW lock.
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
begin;
|
|
select count(*) from t1;
|
|
count(*)
|
|
3
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Sending:
|
|
lock table t1 write;;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that LOCK TABLE is waiting with pending SNRW lock.
|
|
# Check that SW is incompatible with pending SNRW
|
|
# Sending:
|
|
insert into t1 values (1);;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above INSERT is blocked because of pending SNRW lock.
|
|
# Unblock LOCK TABLE.
|
|
commit;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reaping LOCK TABLE.
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping INSERT.
|
|
# Restore pending SNRW lock.
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
begin;
|
|
select count(*) from t1;
|
|
count(*)
|
|
4
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Sending:
|
|
lock table t1 write;;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that LOCK TABLE is waiting with pending SNRW lock.
|
|
# Check that SNW is compatible with pending SNRW
|
|
# So ALTER TABLE statements are not starved by LOCK TABLEs.
|
|
alter table t1 add primary key (c1);
|
|
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Unblock LOCK TABLE.
|
|
commit;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reaping LOCK TABLE.
|
|
unlock tables;
|
|
#
|
|
# We can't do similar check for SNRW and X locks because
|
|
# they will also be blocked by active SR lock.
|
|
#
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
#
|
|
# 3) Check compatibility for pending X lock.
|
|
#
|
|
# Acquire SR lock in order to create pending X lock.
|
|
begin;
|
|
select count(*) from t1;
|
|
count(*)
|
|
4
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Add pending X lock.
|
|
# Sending:
|
|
rename table t1 to t2;;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that RENAME TABLE is waiting with pending X lock.
|
|
# Check that SH locks are compatible with pending X
|
|
select column_name from information_schema.columns where
|
|
table_schema='test' and table_name='t1';
|
|
column_name
|
|
c1
|
|
# Check that S is incompatible with pending X
|
|
# Sending:
|
|
handler t1 open;;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above HANDLER OPEN is blocked because of pending X lock.
|
|
# Unblock RENAME TABLE.
|
|
commit;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reaping RENAME TABLE.
|
|
ERROR 42S01: Table 't2' already exists
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping HANDLER t1 OPEN.
|
|
handler t1 close;
|
|
# Restore pending X lock.
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
begin;
|
|
select count(*) from t1;
|
|
count(*)
|
|
4
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Add pending X lock.
|
|
# Sending:
|
|
rename table t1 to t2;;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that RENAME TABLE is waiting with pending X lock.
|
|
# Check that SR is incompatible with pending X
|
|
# Sending:
|
|
select count(*) from t1;;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above SELECT is blocked because of pending X lock.
|
|
# Unblock RENAME TABLE.
|
|
commit;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reaping RENAME TABLE.
|
|
ERROR 42S01: Table 't2' already exists
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping SELECT.
|
|
count(*)
|
|
4
|
|
# Restore pending X lock.
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
begin;
|
|
select count(*) from t1;
|
|
count(*)
|
|
4
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Add pending X lock.
|
|
# Sending:
|
|
rename table t1 to t2;;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that RENAME TABLE is waiting with pending X lock.
|
|
# Check that SW is incompatible with pending X
|
|
# Sending:
|
|
delete from t1 limit 1;;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above DELETE is blocked because of pending X lock.
|
|
# Unblock RENAME TABLE.
|
|
commit;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reaping RENAME TABLE.
|
|
ERROR 42S01: Table 't2' already exists
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping DELETE.
|
|
# Restore pending X lock.
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
begin;
|
|
select count(*) from t1;
|
|
count(*)
|
|
3
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Add pending X lock.
|
|
# Sending:
|
|
rename table t1 to t2;;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that RENAME TABLE is waiting with pending X lock.
|
|
# Check that SNW is incompatible with pending X
|
|
# Sending:
|
|
alter table t1 add primary key (c1);;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above ALTER TABLE is blocked because of pending X lock.
|
|
# Unblock RENAME TABLE.
|
|
commit;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reaping RENAME TABLE.
|
|
ERROR 42S01: Table 't2' already exists
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping ALTER TABLE.
|
|
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
|
|
# Restore pending X lock.
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
handler t1 open;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Add pending X lock.
|
|
# Sending:
|
|
rename table t1 to t2;;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that RENAME TABLE is waiting with pending X lock.
|
|
# Check that SNRW is incompatible with pending X
|
|
# Sending:
|
|
lock table t1 write;;
|
|
#
|
|
# Switching to connection 'mdl_con3'.
|
|
# Check that the above LOCK TABLES is blocked because of pending X lock.
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Unblock RENAME TABLE.
|
|
handler t1 close;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reaping RENAME TABLE.
|
|
ERROR 42S01: Table 't2' already exists
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reaping LOCK TABLES.
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'default'.
|
|
#
|
|
#
|
|
# C) Now let us test how type-of-operation locks are handled in
|
|
# transactional context. Obviously we are mostly interested
|
|
# in conflicting types of locks.
|
|
#
|
|
#
|
|
# 1) Let us check how various locks used within transactional
|
|
# context interact with active/pending SNW lock.
|
|
#
|
|
# We start with case when we are acquiring lock on the table
|
|
# which was not used in the transaction before.
|
|
begin;
|
|
select count(*) from t1;
|
|
count(*)
|
|
3
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Create an active SNW lock on t2.
|
|
# We have to use DEBUG_SYNC facility as otherwise SNW lock
|
|
# 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';
|
|
# Sending:
|
|
alter table t2 add primary key (c1);;
|
|
#
|
|
# Switching to connection 'default'.
|
|
set debug_sync= 'now WAIT_FOR locked';
|
|
# SR lock should be acquired without any waiting.
|
|
select count(*) from t2;
|
|
count(*)
|
|
2
|
|
commit;
|
|
# Now let us check that we will wait in case of SW lock.
|
|
begin;
|
|
select count(*) from t1;
|
|
count(*)
|
|
3
|
|
# Sending:
|
|
insert into t2 values (1);;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above INSERT is blocked.
|
|
# Unblock ALTER TABLE and thus INSERT.
|
|
set debug_sync= 'now SIGNAL finish';
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reap ALTER TABLE.
|
|
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reap INSERT.
|
|
commit;
|
|
#
|
|
# Now let us see what happens when we are acquiring lock on the table
|
|
# which is already used in transaction.
|
|
#
|
|
# *) First, case when transaction which has SR lock on the table also
|
|
# locked in SNW mode acquires yet another SR lock and then tries
|
|
# to acquire SW lock.
|
|
begin;
|
|
select count(*) from t1;
|
|
count(*)
|
|
3
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Create an active SNW lock on t1.
|
|
set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
|
|
# Sending:
|
|
alter table t1 add primary key (c1);;
|
|
#
|
|
# Switching to connection 'default'.
|
|
set debug_sync= 'now WAIT_FOR locked';
|
|
# We should still be able to get SR lock without waiting.
|
|
select count(*) from t1;
|
|
count(*)
|
|
3
|
|
# Since the above ALTER TABLE is not upgrading SNW lock to X by waiting
|
|
# for SW lock we won't create deadlock.
|
|
# So the below INSERT should not end-up with ER_LOCK_DEADLOCK error.
|
|
# Sending:
|
|
insert into t1 values (1);;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above INSERT is blocked.
|
|
# Unblock ALTER TABLE and thus INSERT.
|
|
set debug_sync= 'now SIGNAL finish';
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reap ALTER TABLE.
|
|
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reap INSERT.
|
|
commit;
|
|
#
|
|
# **) Now test in which transaction that has SW lock on the table
|
|
# against which there is pending SNW lock acquires SR and SW
|
|
# locks on this table.
|
|
#
|
|
begin;
|
|
insert into t1 values (1);
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Create pending SNW lock on t1.
|
|
# Sending:
|
|
alter table t1 add primary key (c1);;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Wait until ALTER TABLE starts waiting for SNW lock.
|
|
# We should still be able to get both SW and SR locks without waiting.
|
|
select count(*) from t1;
|
|
count(*)
|
|
5
|
|
delete from t1 limit 1;
|
|
# Unblock ALTER TABLE.
|
|
commit;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reap ALTER TABLE.
|
|
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
|
|
#
|
|
# Switching to connection 'default'.
|
|
#
|
|
# 2) Now similar tests for active SNW lock which is being upgraded
|
|
# to X lock.
|
|
#
|
|
# Again we start with case when we are acquiring lock on the
|
|
# table which was not used in the transaction before.
|
|
begin;
|
|
select count(*) from t1;
|
|
count(*)
|
|
4
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Start transaction which will prevent SNW -> X upgrade from
|
|
# completing immediately.
|
|
begin;
|
|
select count(*) from t2;
|
|
count(*)
|
|
3
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Create SNW lock pending upgrade to X on t2.
|
|
# Sending:
|
|
alter table t2 add column c2 int;;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Wait until ALTER TABLE starts waiting X lock.
|
|
# Check that attempt to acquire SR lock on t2 causes waiting.
|
|
# Sending:
|
|
select count(*) from t2;;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above SELECT is blocked.
|
|
# Unblock ALTER TABLE.
|
|
commit;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reap ALTER TABLE.
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reap SELECT.
|
|
count(*)
|
|
3
|
|
commit;
|
|
# Do similar check for SW lock.
|
|
begin;
|
|
select count(*) from t1;
|
|
count(*)
|
|
4
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Start transaction which will prevent SNW -> X upgrade from
|
|
# completing immediately.
|
|
begin;
|
|
select count(*) from t2;
|
|
count(*)
|
|
3
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Create SNW lock pending upgrade to X on t2.
|
|
# Sending:
|
|
alter table t2 drop column c2;;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Wait until ALTER TABLE starts waiting X lock.
|
|
# Check that attempt to acquire SW lock on t2 causes waiting.
|
|
# Sending:
|
|
insert into t2 values (1);;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above INSERT is blocked.
|
|
# Unblock ALTER TABLE.
|
|
commit;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reap ALTER TABLE.
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reap INSERT.
|
|
commit;
|
|
#
|
|
# Test for the case in which we are acquiring lock on the table
|
|
# which is already used in transaction.
|
|
#
|
|
begin;
|
|
select count(*) from t1;
|
|
count(*)
|
|
4
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Create SNW lock pending upgrade to X.
|
|
# Sending:
|
|
alter table t1 add column c2 int;;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Wait until ALTER TABLE starts waiting X lock.
|
|
# Check that transaction is still able to acquire SR lock.
|
|
select count(*) from t1;
|
|
count(*)
|
|
4
|
|
# Waiting trying to acquire SW lock will cause deadlock and
|
|
# therefore should cause an error.
|
|
delete from t1 limit 1;
|
|
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
|
|
# Unblock ALTER TABLE.
|
|
commit;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reap ALTER TABLE.
|
|
#
|
|
# Switching to connection 'default'.
|
|
#
|
|
# 3) Check how various locks used within transactional context
|
|
# interact with active/pending SNRW lock.
|
|
#
|
|
# Once again we start with case when we are acquiring lock on
|
|
# the table which was not used in the transaction before.
|
|
begin;
|
|
select count(*) from t1;
|
|
count(*)
|
|
4
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
lock table t2 write;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Attempt to acquire SR should be blocked. It should
|
|
# not cause errors as it does not creates deadlock.
|
|
# Sending:
|
|
select count(*) from t2;;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that the above SELECT is blocked
|
|
# Unblock SELECT.
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reap SELECT.
|
|
count(*)
|
|
4
|
|
commit;
|
|
# Repeat the same test for SW lock.
|
|
begin;
|
|
select count(*) from t1;
|
|
count(*)
|
|
4
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
lock table t2 write;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Again attempt to acquire SW should be blocked and should
|
|
# not cause any errors.
|
|
# Sending:
|
|
delete from t2 limit 1;;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Check that the above DELETE is blocked
|
|
# Unblock DELETE.
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reap DELETE.
|
|
commit;
|
|
#
|
|
# Now coverage for the case in which we are acquiring lock on
|
|
# the table which is already used in transaction and against
|
|
# which there is a pending SNRW lock request.
|
|
#
|
|
# *) Let us start with case when transaction has only a SR lock.
|
|
#
|
|
begin;
|
|
select count(*) from t1;
|
|
count(*)
|
|
4
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Sending:
|
|
lock table t1 write;;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Wait until LOCK TABLE is blocked creating pending request for X lock.
|
|
# Check that another instance of SR lock is granted without waiting.
|
|
select count(*) from t1;
|
|
count(*)
|
|
4
|
|
# Attempt to wait for SW lock will lead to deadlock, thus
|
|
# the below statement should end with ER_LOCK_DEADLOCK error.
|
|
delete from t1 limit 1;
|
|
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
|
|
# Unblock LOCK TABLES.
|
|
commit;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reap LOCK TABLES.
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'default'.
|
|
#
|
|
# **) Now case when transaction has a SW lock.
|
|
#
|
|
begin;
|
|
delete from t1 limit 1;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Sending:
|
|
lock table t1 write;;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Wait until LOCK TABLE is blocked creating pending request for X lock.
|
|
# Check that both SR and SW locks are granted without waiting
|
|
# and errors.
|
|
select count(*) from t1;
|
|
count(*)
|
|
3
|
|
insert into t1 values (1, 1);
|
|
# Unblock LOCK TABLES.
|
|
commit;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reap LOCK TABLES.
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'default'.
|
|
#
|
|
# 4) Check how various locks used within transactional context
|
|
# interact with active/pending X lock.
|
|
#
|
|
# As usual we start with case when we are acquiring lock on
|
|
# the table which was not used in the transaction before.
|
|
begin;
|
|
select count(*) from t1;
|
|
count(*)
|
|
4
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Start transaction which will prevent X lock from going away
|
|
# immediately.
|
|
begin;
|
|
select count(*) from t2;
|
|
count(*)
|
|
3
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Create pending X lock on t2.
|
|
# Sending:
|
|
rename table t2 to t3;;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Wait until RENAME TABLE starts waiting with pending X lock.
|
|
# Check that attempt to acquire SR lock on t2 causes waiting.
|
|
# Sending:
|
|
select count(*) from t2;;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above SELECT is blocked.
|
|
# Unblock RENAME TABLE.
|
|
commit;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reap RENAME TABLE.
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reap SELECT.
|
|
ERROR 42S02: Table 'test.t2' doesn't exist
|
|
commit;
|
|
rename table t3 to t2;
|
|
# The same test for SW lock.
|
|
begin;
|
|
select count(*) from t1;
|
|
count(*)
|
|
4
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Start transaction which will prevent X lock from going away
|
|
# immediately.
|
|
begin;
|
|
select count(*) from t2;
|
|
count(*)
|
|
3
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Create pending X lock on t2.
|
|
# Sending:
|
|
rename table t2 to t3;;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Wait until RENAME TABLE starts waiting with pending X lock.
|
|
# Check that attempt to acquire SW lock on t2 causes waiting.
|
|
# Sending:
|
|
delete from t2 limit 1;;
|
|
#
|
|
# Switching to connection 'mdl_con2'.
|
|
# Check that the above DELETE is blocked.
|
|
# Unblock RENAME TABLE.
|
|
commit;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reap RENAME TABLE.
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reap DELETE.
|
|
ERROR 42S02: Table 'test.t2' doesn't exist
|
|
commit;
|
|
rename table t3 to t2;
|
|
#
|
|
# Coverage for the case in which we are acquiring lock on
|
|
# the table which is already used in transaction and against
|
|
# which there is a pending X lock request.
|
|
#
|
|
# *) The first case is when transaction has only a SR lock.
|
|
#
|
|
begin;
|
|
select count(*) from t1;
|
|
count(*)
|
|
4
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Sending:
|
|
rename table t1 to t2;;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Wait until RENAME TABLE is blocked creating pending request for X lock.
|
|
# Check that another instance of SR lock is granted without waiting.
|
|
select count(*) from t1;
|
|
count(*)
|
|
4
|
|
# Attempt to wait for SW lock will lead to deadlock, thus
|
|
# the below statement should end with ER_LOCK_DEADLOCK error.
|
|
delete from t1 limit 1;
|
|
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
|
|
# Unblock RENAME TABLE.
|
|
commit;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reap RENAME TABLE.
|
|
ERROR 42S01: Table 't2' already exists
|
|
#
|
|
# Switching to connection 'default'.
|
|
#
|
|
# **) The second case is when transaction has a SW lock.
|
|
#
|
|
begin;
|
|
delete from t1 limit 1;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Sending:
|
|
rename table t1 to t2;;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Wait until RENAME TABLE is blocked creating pending request for X lock.
|
|
# Check that both SR and SW locks are granted without waiting
|
|
# and errors.
|
|
select count(*) from t1;
|
|
count(*)
|
|
3
|
|
insert into t1 values (1, 1);
|
|
# Unblock RENAME TABLE.
|
|
commit;
|
|
#
|
|
# Switching to connection 'mdl_con1'.
|
|
# Reap RENAME TABLE.
|
|
ERROR 42S01: Table 't2' already exists
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Clean-up.
|
|
set debug_sync= 'RESET';
|
|
drop table t1, t2;
|
|
#
|
|
# Additional coverage for some scenarios in which not quite
|
|
# correct use of S metadata locks by HANDLER statement might
|
|
# have caused deadlocks.
|
|
#
|
|
drop table if exists t1, t2;
|
|
create table t1 (i int);
|
|
create table t2 (j int);
|
|
insert into t1 values (1);
|
|
#
|
|
# First, check scenario in which we upgrade SNRW lock to X lock
|
|
# on a table while having HANDLER READ trying to acquire TL_READ
|
|
# on the same table.
|
|
#
|
|
handler t1 open;
|
|
#
|
|
# Switching to connection 'handler_con1'.
|
|
lock table t1 write;
|
|
# Upgrade SNRW to X lock.
|
|
# Sending:
|
|
alter table t1 add column j int;;
|
|
#
|
|
# Switching to connection 'handler_con2'.
|
|
# Wait until ALTER is blocked during upgrade.
|
|
#
|
|
# Switching to connection 'default'.
|
|
# The below statement should not cause deadlock.
|
|
handler t1 read first;;
|
|
#
|
|
# Switching to connection 'handler_con1'.
|
|
# Reap ALTER TABLE.
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reap HANDLER READ.
|
|
i j
|
|
1 NULL
|
|
handler t1 close;
|
|
#
|
|
# Now, check scenario in which upgrade of SNRW lock to X lock
|
|
# can be blocked by HANDLER which is open in connection currently
|
|
# waiting to get table-lock owned by connection doing upgrade.
|
|
#
|
|
handler t1 open;
|
|
#
|
|
# Switching to connection 'handler_con1'.
|
|
lock table t1 write, t2 read;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Execute statement which will be blocked on table-level lock
|
|
# owned by connection 'handler_con1'.
|
|
# Sending:
|
|
insert into t2 values (1);;
|
|
#
|
|
# Switching to connection 'handler_con1'.
|
|
# Wait until INSERT is blocked on table-level lock.
|
|
# The below statement should not cause deadlock.
|
|
alter table t1 drop column j;
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reap INSERT.
|
|
handler t1 close;
|
|
#
|
|
# Then, check the scenario in which upgrade of SNRW lock to X
|
|
# lock is blocked by HANDLER which is open in connection currently
|
|
# waiting to get SW lock on the same table.
|
|
#
|
|
handler t1 open;
|
|
#
|
|
# Switching to connection 'handler_con1'.
|
|
lock table t1 write;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# The below insert should be blocked because active SNRW lock on 't1'.
|
|
# Sending:
|
|
insert into t1 values (1);;
|
|
#
|
|
# Switching to connection 'handler_con1'.
|
|
# Wait until INSERT is blocked because of SNRW lock.
|
|
# The below ALTER TABLE will be blocked because of presence of HANDLER.
|
|
# Sending:
|
|
alter table t1 add column j int;;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# INSERT should be chosen as victim for resolving deadlock.
|
|
# Reaping INSERT.
|
|
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
|
|
# Close HANDLER to unblock ALTER TABLE.
|
|
handler t1 close;
|
|
#
|
|
# Switching to connection 'handler_con1'.
|
|
# Reaping ALTER TABLE.
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'default'.
|
|
#
|
|
# Finally, test in which upgrade of SNRW lock to X lock is blocked
|
|
# by HANDLER which is open in connection currently waiting to get
|
|
# SR lock on the table on which lock is upgraded.
|
|
#
|
|
handler t1 open;
|
|
#
|
|
# Switching to connection 'handler_con1'.
|
|
lock table t1 write, t2 write;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# The below insert should be blocked because active SNRW lock on 't1'.
|
|
# Sending:
|
|
insert into t2 values (1);;
|
|
#
|
|
# Switching to connection 'handler_con1'.
|
|
# Wait until INSERT is blocked because of SNRW lock.
|
|
# The below ALTER TABLE will be blocked because of presence of HANDLER.
|
|
# Sending:
|
|
alter table t1 drop column j;;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# INSERT should be chosen as victim for resolving deadlock.
|
|
# Reaping INSERT.
|
|
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
|
|
# Close HANDLER to unblock ALTER TABLE.
|
|
handler t1 close;
|
|
#
|
|
# Switching to connection 'handler_con1'.
|
|
# Reaping ALTER TABLE.
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Clean-up.
|
|
drop tables t1, t2;
|
|
#
|
|
# Test coverage for basic deadlock detection in metadata
|
|
# locking subsystem.
|
|
#
|
|
drop tables if exists t0, t1, t2, t3, t4, t5;
|
|
create table t1 (i int);
|
|
create table t2 (j int);
|
|
create table t3 (k int);
|
|
create table t4 (k int);
|
|
#
|
|
# Test for the case in which no deadlock occurs.
|
|
#
|
|
#
|
|
# Switching to connection 'deadlock_con1'.
|
|
begin;
|
|
insert into t1 values (1);
|
|
#
|
|
# Switching to connection 'deadlock_con2'.
|
|
begin;
|
|
insert into t2 values (1);
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Send:
|
|
rename table t2 to t0, t3 to t2, t0 to t3;;
|
|
#
|
|
# Switching to connection 'deadlock_con1'.
|
|
# Wait until the above RENAME TABLE is blocked because it has to wait
|
|
# for 'deadlock_con2' which holds shared metadata lock on 't2'.
|
|
# The below statement should wait for exclusive metadata lock
|
|
# on 't2' to go away and should not produce ER_LOCK_DEADLOCK
|
|
# as no deadlock is possible in this situation.
|
|
# Send:
|
|
select * from t2;;
|
|
#
|
|
# Switching to connection 'deadlock_con2'.
|
|
# Wait until the above SELECT * FROM t2 is starts waiting
|
|
# for an exclusive metadata lock to go away.
|
|
#
|
|
# Unblock RENAME TABLE by releasing shared metadata lock on t2.
|
|
commit;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reap RENAME TABLE.
|
|
#
|
|
# Switching to connection 'deadlock_con1'.
|
|
# Reap SELECT.
|
|
k
|
|
#
|
|
# Switching to connection 'default'.
|
|
#
|
|
# Let us check that in the process of waiting for conflicting lock
|
|
# on table 't2' to go away transaction in connection 'deadlock_con1'
|
|
# has not released metadata lock on table 't1'.
|
|
# Send:
|
|
rename table t1 to t0, t3 to t1, t0 to t3;;
|
|
#
|
|
# Switching to connection 'deadlock_con1'.
|
|
# Wait until the above RENAME TABLE is blocked because it has to wait
|
|
# for 'deadlock_con1' which should still hold shared metadata lock on
|
|
# table 't1'.
|
|
# Commit transaction to unblock RENAME TABLE.
|
|
commit;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reap RENAME TABLE.
|
|
#
|
|
# Test for case when deadlock occurs and should be detected immediately.
|
|
#
|
|
#
|
|
# Switching to connection 'deadlock_con1'.
|
|
begin;
|
|
insert into t2 values (2);
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Send:
|
|
rename table t2 to t0, t1 to t2, t0 to t1;;
|
|
#
|
|
# Switching to connection 'deadlock_con1'.
|
|
# Wait until the above RENAME TABLE is blocked because it has to wait
|
|
# for 'deadlock_con1' which holds shared metadata lock on 't2'.
|
|
#
|
|
# The below statement should not wait as doing so will cause deadlock.
|
|
# Instead it should fail and emit ER_LOCK_DEADLOCK statement.
|
|
select * from t1;
|
|
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
|
|
#
|
|
# Let us check that failure of the above statement has not released
|
|
# metadata lock on table 't1', i.e. that RENAME TABLE is still blocked.
|
|
# Commit transaction to unblock RENAME TABLE.
|
|
commit;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reap RENAME TABLE.
|
|
#
|
|
# Test for the case in which deadlock also occurs but not immediately.
|
|
#
|
|
#
|
|
# Switching to connection 'deadlock_con1'.
|
|
begin;
|
|
insert into t2 values (1);
|
|
#
|
|
# Switching to connection 'default'.
|
|
lock table t1 write;
|
|
#
|
|
# Switching to connection 'deadlock_con1'.
|
|
# The below SELECT statement should wait for metadata lock
|
|
# on table 't1' and should not produce ER_LOCK_DEADLOCK
|
|
# immediately as no deadlock is possible at the moment.
|
|
select * from t1;;
|
|
#
|
|
# Switching to connection 'deadlock_con2'.
|
|
# Wait until the above SELECT * FROM t1 is starts waiting
|
|
# for an UNRW metadata lock to go away.
|
|
# Send RENAME TABLE statement that will deadlock with the
|
|
# SELECT statement and thus should abort the latter.
|
|
rename table t1 to t0, t2 to t1, t0 to t2;;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Wait till above RENAME TABLE is blocked while holding
|
|
# pending X lock on t1.
|
|
# Allow the above RENAME TABLE to acquire lock on t1 and
|
|
# create pending lock on t2 thus creating deadlock.
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'deadlock_con1'.
|
|
# Since the latest RENAME TABLE entered in deadlock with SELECT
|
|
# statement the latter should be aborted and emit ER_LOCK_DEADLOCK
|
|
# error.
|
|
# Reap SELECT * FROM t1.
|
|
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
|
|
#
|
|
# Again let us check that failure of the SELECT statement has not
|
|
# released metadata lock on table 't2', i.e. that the latest RENAME
|
|
# is blocked.
|
|
# Commit transaction to unblock this RENAME TABLE.
|
|
commit;
|
|
#
|
|
# Switching to connection 'deadlock_con2'.
|
|
# Reap RENAME TABLE ... .
|
|
#
|
|
# Switching to connection 'default'.
|
|
drop tables t1, t2, t3, t4;
|
|
#
|
|
# Now, test case which shows that deadlock detection empiric
|
|
# also takes into account requests for metadata lock upgrade.
|
|
#
|
|
create table t1 (i int);
|
|
insert into t1 values (1);
|
|
# Avoid race which occurs when SELECT in 'deadlock_con1' connection
|
|
# accesses table before the above INSERT unlocks the table and thus
|
|
# its result becomes visible to other connections.
|
|
select * from t1;
|
|
i
|
|
1
|
|
#
|
|
# Switching to connection 'deadlock_con1'.
|
|
begin;
|
|
select * from t1;
|
|
i
|
|
1
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Send:
|
|
alter table t1 add column j int, rename to t2;;
|
|
#
|
|
# Switching to connection 'deadlock_con1'.
|
|
# Wait until the above ALTER TABLE ... RENAME acquires exclusive
|
|
# metadata lock on 't2' and starts waiting for connection
|
|
# 'deadlock_con1' which holds shared lock on 't1'.
|
|
# The below statement should not wait as it will cause deadlock.
|
|
# An appropriate error should be reported instead.
|
|
select * from t2;
|
|
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
|
|
# Again let us check that failure of the above statement has not
|
|
# released all metadata locks in connection 'deadlock_con1' and
|
|
# so ALTER TABLE ... RENAME is still blocked.
|
|
# Commit transaction to unblock ALTER TABLE ... RENAME.
|
|
commit;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reap ALTER TABLE ... RENAME.
|
|
drop table t2;
|
|
#
|
|
# Test for bug #46748 "Assertion in MDL_context::wait_for_locks()
|
|
# on INSERT + CREATE TRIGGER".
|
|
#
|
|
drop tables if exists t1, t2, t3, t4, t5;
|
|
# Let us simulate scenario in which we open some tables from extended
|
|
# part of prelocking set but then encounter conflicting metadata lock,
|
|
# so have to back-off and wait for it to go away.
|
|
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);
|
|
#
|
|
# Switching to connection 'con1root'.
|
|
lock tables t4 read;
|
|
#
|
|
# Switching to connection 'con2root'.
|
|
# Send :
|
|
rename table t3 to t5, t4 to t3;;
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Wait until the above RENAME TABLE adds pending requests for exclusive
|
|
# metadata lock on its tables and blocks due to 't4' being used by LOCK
|
|
# TABLES.
|
|
# Send :
|
|
insert into t1 values (1);;
|
|
#
|
|
# Switching to connection 'con1root'.
|
|
# Wait until INSERT statement waits due to encountering pending
|
|
# exclusive metadata lock on 't3'.
|
|
unlock tables;
|
|
#
|
|
# Switching to connection 'con2root'.
|
|
# Reap RENAME TABLE.
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Reap INSERT.
|
|
# Clean-up.
|
|
drop tables t1, t2, t3, t5;
|
|
#
|
|
# Bug#42546 - Backup: RESTORE fails, thinking it finds an existing table
|
|
#
|
|
DROP TABLE IF EXISTS t1;
|
|
set @save_log_output=@@global.log_output;
|
|
set global log_output=file;
|
|
#
|
|
# Test 1: CREATE TABLE
|
|
#
|
|
# Connection 2
|
|
# Start insert on the not-yet existing table
|
|
# Wait after taking the MDL lock
|
|
SET DEBUG_SYNC= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
|
|
INSERT INTO t1 VALUES(1,"def");
|
|
# Connection 1
|
|
SET DEBUG_SYNC= 'now WAIT_FOR locked';
|
|
# Now INSERT has a MDL on the non-existent table t1.
|
|
#
|
|
# Continue the INSERT once CREATE waits for exclusive lock
|
|
SET DEBUG_SYNC= 'mdl_acquire_lock_wait SIGNAL finish';
|
|
# Try to create that table.
|
|
CREATE TABLE t1 (c1 INT, c2 VARCHAR(100), KEY(c1));
|
|
# Connection 2
|
|
# Insert fails
|
|
ERROR 42S02: Table 'test.t1' doesn't exist
|
|
# Connection 1
|
|
SET DEBUG_SYNC= 'RESET';
|
|
SHOW TABLES;
|
|
Tables_in_test
|
|
t1
|
|
DROP TABLE IF EXISTS t1;
|
|
#
|
|
# Test 2: CREATE TABLE LIKE
|
|
#
|
|
CREATE TABLE t2 (c1 INT, c2 VARCHAR(100), KEY(c1));
|
|
# Connection 2
|
|
# Start insert on the not-yet existing table
|
|
# Wait after taking the MDL
|
|
SET DEBUG_SYNC= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
|
|
INSERT INTO t1 VALUES(1,"def");
|
|
# Connection 1
|
|
SET DEBUG_SYNC= 'now WAIT_FOR locked';
|
|
# Now INSERT has a MDL on the non-existent table t1.
|
|
#
|
|
# Continue the INSERT once CREATE waits for exclusive lock
|
|
SET DEBUG_SYNC= 'mdl_acquire_lock_wait SIGNAL finish';
|
|
# Try to create that table.
|
|
CREATE TABLE t1 LIKE t2;
|
|
# Connection 2
|
|
# Insert fails
|
|
ERROR 42S02: Table 'test.t1' doesn't exist
|
|
# Connection 1
|
|
SET DEBUG_SYNC= 'RESET';
|
|
SHOW TABLES;
|
|
Tables_in_test
|
|
t1
|
|
t2
|
|
DROP TABLE t2;
|
|
DROP TABLE IF EXISTS t1;
|
|
set global log_output=@save_log_output;
|
|
#
|
|
# Bug #46044 "MDL deadlock on LOCK TABLE + CREATE TABLE HIGH_PRIORITY
|
|
# FOR UPDATE"
|
|
#
|
|
drop tables if exists t1, t2;
|
|
create table t1 (i int);
|
|
# Let us check that we won't deadlock if during filling
|
|
# of I_S table we encounter conflicting metadata lock
|
|
# which owner is in its turn waiting for our connection.
|
|
lock tables t1 read;
|
|
# Switching to connection 'con46044'.
|
|
# Sending:
|
|
create table t2 select * from t1 for update;;
|
|
# Switching to connection 'default'.
|
|
# Waiting until CREATE TABLE ... SELECT ... is blocked.
|
|
# First let us check that SHOW FIELDS/DESCRIBE doesn't
|
|
# gets blocked and emits and error.
|
|
show fields from t2;
|
|
ERROR HY000: Table 'test'.'t2' was skipped since its definition is being modified by concurrent DDL statement
|
|
# Now test for I_S query which reads only .FRMs.
|
|
#
|
|
# Query below should only emit a warning.
|
|
select column_name from information_schema.columns
|
|
where table_schema='test' and table_name='t2';
|
|
column_name
|
|
Warnings:
|
|
Warning 1684 Table 'test'.'t2' was skipped since its definition is being modified by concurrent DDL statement
|
|
# Finally, test for I_S query which does full-blown table open.
|
|
#
|
|
# Query below should not be blocked. Warning message should be
|
|
# 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';
|
|
table_name table_type auto_increment table_comment
|
|
t2 BASE TABLE NULL Table 'test'.'t2' was skipped since its definition is being modified by concurre
|
|
# Switching to connection 'default'.
|
|
unlock tables;
|
|
# Switching to connection 'con46044'.
|
|
# Reaping CREATE TABLE ... SELECT ... .
|
|
drop table t2;
|
|
#
|
|
# Let us also check that queries to I_S wait for conflicting metadata
|
|
# locks to go away instead of skipping table with a warning in cases
|
|
# when deadlock is not possible. This is a nice thing from compatibility
|
|
# and ease of use points of view.
|
|
#
|
|
# We check same three queries to I_S in this new situation.
|
|
# Switching to connection 'con46044_2'.
|
|
lock tables t1 read;
|
|
# Switching to connection 'con46044'.
|
|
# Sending:
|
|
create table t2 select * from t1 for update;;
|
|
# Switching to connection 'default'.
|
|
# Waiting until CREATE TABLE ... SELECT ... is blocked.
|
|
# Let us check that SHOW FIELDS/DESCRIBE gets blocked.
|
|
# Sending:
|
|
show fields from t2;;
|
|
# Switching to connection 'con46044_2'.
|
|
# Wait until SHOW FIELDS gets blocked.
|
|
unlock tables;
|
|
# Switching to connection 'con46044'.
|
|
# Reaping CREATE TABLE ... SELECT ... .
|
|
# Switching to connection 'default'.
|
|
# Reaping SHOW FIELDS ...
|
|
Field Type Null Key Default Extra
|
|
i int(11) YES NULL
|
|
drop table t2;
|
|
# Switching to connection 'con46044_2'.
|
|
lock tables t1 read;
|
|
# Switching to connection 'con46044'.
|
|
# Sending:
|
|
create table t2 select * from t1 for update;;
|
|
# Switching to connection 'default'.
|
|
# Waiting until CREATE TABLE ... SELECT ... is blocked.
|
|
# Check that I_S query which reads only .FRMs gets blocked.
|
|
# Sending:
|
|
select column_name from information_schema.columns where table_schema='test' and table_name='t2';;
|
|
# Switching to connection 'con46044_2'.
|
|
# Wait until SELECT COLUMN_NAME FROM I_S.COLUMNS gets blocked.
|
|
unlock tables;
|
|
# Switching to connection 'con46044'.
|
|
# Reaping CREATE TABLE ... SELECT ... .
|
|
# Switching to connection 'default'.
|
|
# Reaping SELECT COLUMN_NAME FROM I_S.COLUMNS
|
|
column_name
|
|
i
|
|
drop table t2;
|
|
# Switching to connection 'con46044_2'.
|
|
lock tables t1 read;
|
|
# Switching to connection 'con46044'.
|
|
# Sending:
|
|
create table t2 select * from t1 for update;;
|
|
# Switching to connection 'default'.
|
|
# Waiting until CREATE TABLE ... SELECT ... is blocked.
|
|
# Finally, check that I_S query which does full-blown table open
|
|
# also gets blocked.
|
|
# Sending:
|
|
select table_name, table_type, auto_increment, table_comment from information_schema.tables where table_schema='test' and table_name='t2';;
|
|
# Switching to connection 'con46044_2'.
|
|
# Wait until SELECT ... FROM I_S.TABLES gets blocked.
|
|
unlock tables;
|
|
# Switching to connection 'con46044'.
|
|
# Reaping CREATE TABLE ... SELECT ... .
|
|
# Switching to connection 'default'.
|
|
# Reaping SELECT ... FROM I_S.TABLES
|
|
table_name table_type auto_increment table_comment
|
|
t2 BASE TABLE NULL
|
|
drop table t2;
|
|
# Switching to connection 'default'.
|
|
# Clean-up.
|
|
drop table t1;
|
|
#
|
|
# Test for bug #46273 "MySQL 5.4.4 new MDL: Bug#989 is not fully fixed
|
|
# in case of ALTER".
|
|
#
|
|
drop table if exists t1;
|
|
set debug_sync= 'RESET';
|
|
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;
|
|
c1 c2 c3
|
|
3 3 0
|
|
#
|
|
# Switching to connection 'con46273'.
|
|
set debug_sync='after_lock_tables_takes_lock SIGNAL alter_table_locked WAIT_FOR alter_go';
|
|
alter table t1 add column e int, rename to t2;;
|
|
#
|
|
# Switching to connection 'default'.
|
|
set debug_sync='now WAIT_FOR alter_table_locked';
|
|
set debug_sync='before_open_table_wait_refresh SIGNAL alter_go';
|
|
# The below statement should get ER_LOCK_DEADLOCK error
|
|
# (i.e. it should not allow ALTER to proceed, and then
|
|
# fail due to 't1' changing its name to 't2').
|
|
update t1 set c3=c3+1 where c2 = 3;
|
|
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
|
|
#
|
|
# Let us check that failure of the above statement has not released
|
|
# metadata lock on table 't1', i.e. that ALTER TABLE is still blocked.
|
|
# Unblock ALTER TABLE by commiting transaction and thus releasing
|
|
# metadata lock on 't1'.
|
|
commit;
|
|
#
|
|
# Switching to connection 'con46273'.
|
|
# Reap ALTER TABLE.
|
|
#
|
|
# Switching to connection 'default'.
|
|
# Clean-up.
|
|
set debug_sync= 'RESET';
|
|
drop table t2;
|
|
#
|
|
# Test for bug #46673 "Deadlock between FLUSH TABLES WITH READ LOCK
|
|
# and DML".
|
|
#
|
|
drop tables if exists t1;
|
|
create table t1 (i int);
|
|
# Switching to connection 'con46673'.
|
|
begin;
|
|
insert into t1 values (1);
|
|
# Switching to connection 'default'.
|
|
# Statement below should not get blocked. And if after some
|
|
# changes to code it is there should not be a deadlock between
|
|
# it and transaction from connection 'con46673'.
|
|
flush tables with read lock;
|
|
unlock tables;
|
|
# Switching to connection 'con46673'.
|
|
delete from t1 where i = 1;
|
|
commit;
|
|
# Switching to connection 'default'.
|
|
# Clean-up
|
|
drop table t1;
|
|
#
|
|
# Bug#48210 FLUSH TABLES WITH READ LOCK deadlocks
|
|
# against concurrent CREATE PROCEDURE
|
|
#
|
|
# Test 1: CREATE PROCEDURE
|
|
# Connection 1
|
|
# Start CREATE PROCEDURE and open mysql.proc
|
|
SET DEBUG_SYNC= 'after_open_table_mdl_shared SIGNAL table_opened WAIT_FOR grlwait';
|
|
CREATE PROCEDURE p1() SELECT 1;
|
|
# Connection 2
|
|
SET DEBUG_SYNC= 'now WAIT_FOR table_opened';
|
|
# Check that FLUSH must wait to get the GRL
|
|
# and let CREATE PROCEDURE continue
|
|
SET DEBUG_SYNC= 'wait_lock_global_read_lock SIGNAL grlwait';
|
|
FLUSH TABLES WITH READ LOCK;
|
|
# Connection 1
|
|
# Connection 2
|
|
UNLOCK TABLES;
|
|
# Connection 1
|
|
SET DEBUG_SYNC= 'RESET';
|
|
# Test 2: DROP PROCEDURE
|
|
# Start DROP PROCEDURE and open tables
|
|
SET DEBUG_SYNC= 'after_open_table_mdl_shared SIGNAL table_opened WAIT_FOR grlwait';
|
|
DROP PROCEDURE p1;
|
|
# Connection 2
|
|
SET DEBUG_SYNC= 'now WAIT_FOR table_opened';
|
|
# Check that FLUSH must wait to get the GRL
|
|
# and let DROP PROCEDURE continue
|
|
SET DEBUG_SYNC= 'wait_lock_global_read_lock SIGNAL grlwait';
|
|
FLUSH TABLES WITH READ LOCK;
|
|
# Connection 1
|
|
# Connection 2
|
|
UNLOCK TABLES;
|
|
# Connection 1
|
|
SET DEBUG_SYNC= 'RESET';
|
|
#
|
|
# Bug#50786 Assertion `thd->mdl_context.trans_sentinel() == __null'
|
|
# failed in open_ltable()
|
|
#
|
|
DROP TABLE IF EXISTS t1, t2;
|
|
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;
|
|
# connection: con1
|
|
HANDLER t1 OPEN;
|
|
# connection: con3
|
|
SET @@session.sql_log_off= 1;
|
|
# connection: con2
|
|
SET DEBUG_SYNC= 'thr_multi_lock_after_thr_lock SIGNAL parked WAIT_FOR go';
|
|
# Sending:
|
|
SELECT 1;
|
|
# connection: con3
|
|
SET DEBUG_SYNC= 'now WAIT_FOR parked';
|
|
# connection: con1
|
|
# Sending:
|
|
SELECT 1;
|
|
# connection: con3
|
|
# Sending:
|
|
ALTER TABLE t1 ADD COLUMN j INT;
|
|
# connection: default
|
|
SET DEBUG_SYNC= 'now SIGNAL go';
|
|
# connection: con1
|
|
# Reaping SELECT 1
|
|
1
|
|
1
|
|
HANDLER t1 CLOSE;
|
|
# connection: con2
|
|
# Reaping SELECT 1
|
|
1
|
|
1
|
|
# connection: con3
|
|
# Reaping ALTER TABLE t1 ADD COLUMN j INT
|
|
# connection: default
|
|
DROP TABLE t1, t2;
|
|
SET DEBUG_SYNC= 'RESET';
|
|
SET @@global.general_log= @old_general_log;
|
|
SET @@global.log_output= @old_log_output;
|
|
SET @@session.sql_log_off= @old_sql_log_off;
|
|
#
|
|
# Additional coverage for bug #50913 "Deadlock between
|
|
# open_and_lock_tables_derived and MDL". The main test
|
|
# case is in lock_multi.test
|
|
#
|
|
drop table if exists t1;
|
|
set debug_sync= 'RESET';
|
|
create table t1 (i int) engine=InnoDB;
|
|
# Switching to connection 'con50913_1'.
|
|
set debug_sync= 'thr_multi_lock_after_thr_lock SIGNAL parked WAIT_FOR go';
|
|
# Sending:
|
|
alter table t1 add column j int;
|
|
# Switching to connection 'default'.
|
|
# Wait until ALTER TABLE gets blocked on a sync point after
|
|
# acquiring thr_lock.c lock.
|
|
set debug_sync= 'now WAIT_FOR parked';
|
|
# The below statement should wait on MDL lock and not deadlock on
|
|
# thr_lock.c lock.
|
|
# Sending:
|
|
truncate table t1;
|
|
# Switching to connection 'con50913_2'.
|
|
# Wait until TRUNCATE TABLE is blocked on MDL lock.
|
|
# Unblock ALTER TABLE.
|
|
set debug_sync= 'now SIGNAL go';
|
|
# Switching to connection 'con50913_1'.
|
|
# Reaping ALTER TABLE.
|
|
# Switching to connection 'default'.
|
|
# Reaping TRUNCATE TABLE.
|
|
set debug_sync= 'RESET';
|
|
drop table t1;
|
|
#
|
|
# Test for bug #50998 "Deadlock in MDL code during test
|
|
# rqg_mdl_stability".
|
|
# Also provides coverage for the case when addition of
|
|
# waiting statement adds several loops in the waiters
|
|
# graph and therefore several searches for deadlock
|
|
# should be performed.
|
|
drop table if exists t1;
|
|
set debug_sync= 'RESET';
|
|
create table t1 (i int);
|
|
# Switching to connection 'con1'.
|
|
begin;
|
|
select * from t1;
|
|
i
|
|
# Switching to connection 'con2'.
|
|
begin;
|
|
select * from t1;
|
|
i
|
|
# Switching to connection 'default'.
|
|
# Start ALTER TABLE which will acquire SNW lock and
|
|
# table lock and get blocked on sync point.
|
|
set debug_sync= 'thr_multi_lock_after_thr_lock SIGNAL parked WAIT_FOR go';
|
|
# Sending:
|
|
alter table t1 add column j int;
|
|
# Switching to connection 'con1'.
|
|
# Wait until ALTER TABLE gets blocked on a sync point.
|
|
set debug_sync= 'now WAIT_FOR parked';
|
|
# Sending:
|
|
insert into t1 values (1);
|
|
# Switching to connection 'con2'.
|
|
# Sending:
|
|
insert into t1 values (1);
|
|
# Switching to connection 'con3'.
|
|
# Wait until both 'con1' and 'con2' are blocked trying to acquire
|
|
# SW lock on the table.
|
|
# Unblock ALTER TABLE. Since it will try to upgrade SNW to X lock
|
|
# deadlock with two loops in waiting graph will occur. Both loops
|
|
# should be found and DML statements in both 'con1' and 'con2'
|
|
# should be aborted with ER_LOCK_DEADLOCK errors.
|
|
set debug_sync= 'now SIGNAL go';
|
|
# Switching to connection 'con1'.
|
|
# Reaping INSERT. It should end with ER_LOCK_DEADLOCK error and
|
|
# not wait indefinitely (as it happened before the bugfix).
|
|
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
|
|
commit;
|
|
# Switching to connection 'con2'.
|
|
# Reaping INSERT.
|
|
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
|
|
commit;
|
|
# Switching to connection 'default'.
|
|
# Reap ALTER TABLE.
|
|
set debug_sync= 'RESET';
|
|
drop table t1;
|