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mariadb/mysql-test/main/mdl_sync.result
Monty 7fb9d64989 Changed FLUSH TABLES to not change share version 
Part of MDEV-5336 Implement LOCK FOR BACKUP

Originally both table metadata lock and global read lock protection
were acquired before getting TABLE from table cache. This will be
reordered in a future commit with MDL_BACKUP_XXX locks so that we
first take table metadata lock, then get TABLE from table cache, then
acquire analogue of global read lock.

This patch both simplifies FLUSH TABLES code, makes FLUSH TABLES to
lock less and also enables FLUSH TABLES code to be used with backup
locks.

The usage of FLUSH TABLES changes slightly:
- FLUSH TABLES without any arguments will now only close not used tables
  and tables locked by the FLUSH TABLES connection.  All not used table
  shares will be closed.
  Tables locked by the FLUSH TABLES connection will be reopened and
  re-locked after all others has stoped using the table (as before).
  If there was no locked tables, then FLUSH TABLES is instant and will
  not cause any waits.
  FLUSH TABLES will not wait for any in use table.
- FLUSH TABLES with a table list, will ensure that the tables are closed
  before statement returns. The code is now only using MDL locks and not
  table share versions, which simplices the code greatly. One visible
  change is that the server will wait for the end of the transaction that
  are using the tables. Before FLUSH TABLES only waited for the statements
  to end.

Signed-off-by: Monty <monty@mariadb.org>
2018-12-09 22:12:26 +02:00

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SET DEBUG_SYNC= 'RESET';
connect con1,localhost,root,,test,,;
connect con2,localhost,root,,test,,;
connect con3,localhost,root,,test,,;
connection default;
drop table if exists t1,t2,t3;
create table t1 (i int);
create table t2 (i int);
connection: default
lock tables t2 read;
connection con1;
connection: con1
set debug_sync='mdl_upgrade_lock SIGNAL parked WAIT_FOR go';
alter table t1 rename t3;
connection default;
connection: default
set debug_sync= 'now WAIT_FOR parked';
connection con2;
connection: con2
set debug_sync='mdl_acquire_lock_wait SIGNAL go';
drop table t1,t2;
connection con1;
connection: con1
connection default;
connection: default
unlock tables;
connection con2;
connection: con2
ERROR 42S02: Unknown table 'test.t1'
connection default;
drop table t3;
disconnect con1;
disconnect con2;
disconnect con3;
SET DEBUG_SYNC= 'RESET';
#
# Basic test coverage for type-of-operation aware metadata locks.
#
drop table if exists t1, t2, t3;
connect mdl_con1,localhost,root,,;
connect mdl_con2,localhost,root,,;
connect mdl_con3,localhost,root,,;
connection default;
set debug_sync= 'RESET';
create table t1 (c1 int);
#
# A) First let us check compatibility rules between differend kinds of
# type-of-operation aware metadata locks.
# Of course, these rules are already covered by the tests scattered
# across the test suite. But it still makes sense to have one place
# which covers all of them.
#
# 1) Acquire S (simple shared) lock on the table (by using HANDLER):
#
handler t1 open;
#
connection mdl_con1;
# Check that S, SH, SR and SW locks are compatible with it.
handler t1 open t;
handler t close;
select column_name from information_schema.columns where
table_schema='test' and table_name='t1';
column_name
c1
select count(*) from t1;
count(*)
0
insert into t1 values (1), (1);
# Check that SU lock is compatible with it. To do this use ALTER TABLE
# which will fail when constructing .frm and thus obtaining SU metadata
# lock.
alter table t1 add index (not_exist);
ERROR 42000: Key column 'not_exist' doesn't exist in table
# Check that SNW lock is compatible with it. To do this use ALTER TABLE
# which will fail during copying the table and thus obtaining SNW metadata
# lock.
alter table t1 add primary key (c1);
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
# Check that X lock is incompatible with S lock.
# Sending:
rename table t1 to t2;;
#
connection mdl_con2;
# Check that the above RENAME is blocked because of S lock.
#
connection default;
# Unblock RENAME TABLE.
handler t1 close;
#
connection mdl_con1;
# Reaping RENAME TABLE.
# Restore the original state of the things.
rename table t2 to t1;
#
connection default;
handler t1 open;
#
connection mdl_con1;
# Check that upgrade from SNW to X is blocked by presence of S lock.
# Sending:
alter table t1 add column c2 int;;
#
connection mdl_con2;
# Check that the above ALTER TABLE is blocked because of S lock.
#
connection default;
# Unblock ALTER TABLE.
handler t1 close;
#
connection mdl_con1;
# Reaping ALTER TABLE.
# Restore the original state of the things.
alter table t1 drop column c2;
#
connection default;
#
# 2) Acquire SH (shared high-priority) lock on the table.
# We have to involve DEBUG_SYNC facility for this as usually
# such kind of locks are short-lived.
#
set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
# Sending:
select table_name, table_type, auto_increment, table_comment from information_schema.tables where table_schema='test' and table_name='t1';;
#
connection mdl_con1;
set debug_sync= 'now WAIT_FOR locked';
# Check that S, SH, SR and SW locks are compatible with it.
handler t1 open;
handler t1 close;
select column_name from information_schema.columns where
table_schema='test' and table_name='t1';
column_name
c1
select count(*) from t1;
count(*)
2
insert into t1 values (1);
# Check that SU lock is compatible with it. To do this use ALTER TABLE
# which will fail when constructing .frm and thus obtaining SU metadata
# lock.
alter table t1 add index (not_exist);
ERROR 42000: Key column 'not_exist' doesn't exist in table
# Check that SNW lock is compatible with it. To do this use ALTER TABLE
# which will fail during copying the table and thus obtaining SNW metadata
# lock.
alter table t1 add primary key (c1);
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
# Check that SNRW lock is compatible with SH lock.
lock table t1 write;
delete from t1 limit 1;
unlock tables;
# Check that X lock is incompatible with SH lock.
# Sending:
rename table t1 to t2;;
#
connection mdl_con2;
# Check that the above RENAME is blocked because of SH lock.
# Unblock RENAME TABLE.
set debug_sync= 'now SIGNAL finish';
#
connection default;
# Reaping SELECT ... FROM I_S.
table_name table_type auto_increment table_comment
t1 BASE TABLE NULL
#
connection mdl_con1;
# Reaping RENAME TABLE.
# Restore the original state of the things.
rename table t2 to t1;
#
connection default;
set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
# Sending:
select table_name, table_type, auto_increment, table_comment from information_schema.tables where table_schema='test' and table_name='t1';;
#
connection mdl_con1;
set debug_sync= 'now WAIT_FOR locked';
# Check that upgrade from SNW to X is blocked by presence of SH lock.
# Sending:
alter table t1 add column c2 int;;
#
connection mdl_con2;
# Check that the above ALTER TABLE is blocked because of SH lock.
# Unblock RENAME TABLE.
set debug_sync= 'now SIGNAL finish';
#
connection default;
# Reaping SELECT ... FROM I_S.
table_name table_type auto_increment table_comment
t1 BASE TABLE NULL
#
connection mdl_con1;
# Reaping ALTER TABLE.
# Restore the original state of the things.
alter table t1 drop column c2;
#
connection default;
set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
select table_name, table_type, auto_increment, table_comment from information_schema.tables where table_schema='test' and table_name='t1';;
#
connection mdl_con1;
set debug_sync= 'now WAIT_FOR locked';
# Check that upgrade from SNRW to X is blocked by presence of S lock.
lock table t1 write;
# Sending:
alter table t1 add column c2 int;;
#
connection mdl_con2;
# Check that the above upgrade of SNRW to X in ALTER TABLE is blocked
# because of S lock.
# Unblock RENAME TABLE.
set debug_sync= 'now SIGNAL finish';
#
connection default;
# Reaping SELECT ... FROM I_S.
table_name table_type auto_increment table_comment
t1 BASE TABLE NULL
#
connection mdl_con1;
# Reaping ALTER TABLE.
# Restore the original state of the things.
alter table t1 drop column c2;
unlock tables;
#
connection default;
#
#
# 3) Acquire SR lock on the table.
#
#
begin;
select count(*) from t1;
count(*)
2
#
connection mdl_con1;
# Check that S, SH, SR and SW locks are compatible with it.
handler t1 open;
handler t1 close;
select column_name from information_schema.columns where
table_schema='test' and table_name='t1';
column_name
c1
select count(*) from t1;
count(*)
2
insert into t1 values (1);
# Check that SU lock is compatible with it. To do this use ALTER TABLE
# which will fail when constructing .frm and thus obtaining SU metadata
# lock.
alter table t1 add index (not_exist);
ERROR 42000: Key column 'not_exist' doesn't exist in table
# Check that SNW lock is compatible with it. To do this use ALTER TABLE
# which will fail during copying the table and thus obtaining SNW metadata
# lock.
alter table t1 add primary key (c1);
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
# Check that SNRW lock is not compatible with SR lock.
# Sending:
lock table t1 write;;
#
connection default;
# Check that the above LOCK TABLES is blocked because of SR lock.
# Unblock LOCK TABLES.
commit;
#
connection mdl_con1;
# Reaping LOCK TABLES.
delete from t1 limit 1;
unlock tables;
#
connection default;
begin;
select count(*) from t1;
count(*)
2
#
connection mdl_con1;
# Check that X lock is incompatible with SR lock.
# Sending:
rename table t1 to t2;;
#
connection mdl_con2;
# Check that the above RENAME is blocked because of SR lock.
#
connection default;
# Unblock RENAME TABLE.
commit;
#
connection mdl_con1;
# Reaping RENAME TABLE.
# Restore the original state of the things.
rename table t2 to t1;
#
connection default;
begin;
select count(*) from t1;
count(*)
2
#
connection mdl_con1;
# Check that upgrade from SNW to X is blocked by presence of SR lock.
# Sending:
alter table t1 add column c2 int;;
#
connection mdl_con2;
# Check that the above ALTER TABLE is blocked because of SR lock.
#
connection default;
# Unblock ALTER TABLE.
commit;
#
connection mdl_con1;
# Reaping ALTER TABLE.
# Restore the original state of the things.
alter table t1 drop column c2;
#
# There is no need to check that upgrade from SNRW to X is blocked
# by presence of SR lock because SNRW is incompatible with SR anyway.
#
#
connection default;
#
#
# 4) Acquire SW lock on the table.
#
#
begin;
insert into t1 values (1);
#
connection mdl_con1;
# Check that S, SH, SR and SW locks are compatible with it.
handler t1 open;
handler t1 close;
select column_name from information_schema.columns where
table_schema='test' and table_name='t1';
column_name
c1
# Disable result log to make test robust against
# effects of concurrent insert.
select * from t1;
insert into t1 values (1);
# Check that SU lock is compatible with it. To do this use ALTER TABLE
# which will fail when constructing .frm and thus obtaining SU metadata
# lock.
alter table t1 add index (not_exist);
ERROR 42000: Key column 'not_exist' doesn't exist in table
# Check that SNW lock is not compatible with SW lock.
# Again we use ALTER TABLE which fails during copying
# the table to avoid upgrade of SNW -> X.
# Sending:
alter table t1 add primary key (c1);;
#
connection default;
# Check that the above ALTER TABLE is blocked because of SW lock.
# Unblock ALTER TABLE.
commit;
#
connection mdl_con1;
# Reaping ALTER TABLE.
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
#
connection default;
begin;
insert into t1 values (1);
#
connection mdl_con1;
# Check that SNRW lock is not compatible with SW lock.
# Sending:
lock table t1 write;;
#
connection default;
# Check that the above LOCK TABLES is blocked because of SW lock.
# Unblock LOCK TABLES.
commit;
#
connection mdl_con1;
# Reaping LOCK TABLES.
delete from t1 limit 2;
unlock tables;
#
connection default;
begin;
insert into t1 values (1);
#
connection mdl_con1;
# Check that X lock is incompatible with SW lock.
# Sending:
rename table t1 to t2;;
#
connection mdl_con2;
# Check that the above RENAME is blocked because of SW lock.
#
connection default;
# Unblock RENAME TABLE.
commit;
#
connection mdl_con1;
# Reaping RENAME TABLE.
# Restore the original state of the things.
rename table t2 to t1;
#
# There is no need to check that upgrade from SNW/SNRW to X is
# blocked by presence of SW lock because SNW/SNRW is incompatible
# with SW anyway.
#
#
connection default;
#
#
# 5) Acquire SU lock on the table. We have to use DEBUG_SYNC for
# this, to prevent SU from being immediately upgraded to X.
#
set debug_sync= 'alter_opened_table SIGNAL locked WAIT_FOR finish';
# Sending:
alter table t1 add primary key (c1);;
#
connection mdl_con1;
set debug_sync= 'now WAIT_FOR locked';
# Check that S, SH, SR and SW locks are compatible with it.
handler t1 open;
handler t1 close;
select column_name from information_schema.columns where
table_schema='test' and table_name='t1';
column_name
c1
select count(*) from t1;
count(*)
4
delete from t1 limit 1;
# Check that SU lock is incompatible with SU lock.
# Sending:
alter table t1 add primary key (c1);;
#
connection mdl_con2;
# Check that the above ALTER is blocked because of SU lock.
# Unblock ALTERs.
set debug_sync= 'now SIGNAL finish';
#
connection default;
# Reaping first ALTER TABLE.
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
#
connection mdl_con1;
# Reaping another ALTER TABLE.
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
#
connection default;
set debug_sync= 'alter_opened_table SIGNAL locked WAIT_FOR finish';
# Sending:
alter table t1 add primary key (c1);;
#
connection mdl_con1;
set debug_sync= 'now WAIT_FOR locked';
# Check that SNRW lock is incompatible with SU lock.
# Sending:
lock table t1 write;;
#
connection mdl_con2;
# Check that the above LOCK TABLES is blocked because of SU lock.
# Unblock ALTER and thus LOCK TABLES.
set debug_sync= 'now SIGNAL finish';
#
connection default;
# Reaping ALTER TABLE.
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
#
connection mdl_con1;
# Reaping LOCK TABLES
insert into t1 values (1);
unlock tables;
#
connection default;
set debug_sync= 'alter_opened_table SIGNAL locked WAIT_FOR finish';
# Sending:
alter table t1 add primary key (c1);;
#
connection mdl_con1;
set debug_sync= 'now WAIT_FOR locked';
# Check that X lock is incompatible with SU lock.
# Sending:
rename table t1 to t2;;
#
connection mdl_con2;
# Check that the above RENAME is blocked because of SU lock.
# Unblock ALTER and thus RENAME TABLE.
set debug_sync= 'now SIGNAL finish';
#
connection default;
# Now we have ALTER TABLE with SU->SNW and RENAME TABLE with pending
# X-lock. In this case ALTER TABLE should be chosen as victim.
# Reaping ALTER TABLE.
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
#
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 SU lock because SNW/SNRW is
# incompatible with SU anyway.
#
connection default;
#
#
# 6) Acquire SNW lock on the table. We have to use DEBUG_SYNC for
# this, to prevent SNW from being immediately upgraded to X.
#
set debug_sync= 'alter_table_copy_after_lock_upgrade SIGNAL locked WAIT_FOR finish';
# Sending:
alter table t1 add primary key (c1), lock=shared, algorithm=copy;;
#
connection mdl_con1;
set debug_sync= 'now WAIT_FOR locked';
# Check that S, SH and SR locks are compatible with it.
handler t1 open;
handler t1 close;
select column_name from information_schema.columns where
table_schema='test' and table_name='t1';
column_name
c1
select count(*) from t1;
count(*)
4
# Check that SW lock is incompatible with SNW lock.
# Sending:
delete from t1 limit 2;;
#
connection mdl_con2;
# Check that the above DELETE is blocked because of SNW lock.
# Unblock ALTER and thus DELETE.
set debug_sync= 'now SIGNAL finish';
#
connection default;
# Reaping ALTER TABLE.
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
#
connection mdl_con1;
# Reaping DELETE.
#
connection default;
set debug_sync= 'alter_table_copy_after_lock_upgrade SIGNAL locked WAIT_FOR finish';
# Sending:
alter table t1 add primary key (c1), lock=shared, algorithm=copy;;
#
connection mdl_con1;
set debug_sync= 'now WAIT_FOR locked';
# Check that SU lock is incompatible with SNW lock.
# Sending:
alter table t1 add primary key (c1);;
#
connection mdl_con2;
# Check that the above ALTER is blocked because of SNW lock.
# Unblock ALTERs.
set debug_sync= 'now SIGNAL finish';
#
connection default;
# Reaping first ALTER TABLE.
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
#
connection mdl_con1;
# Reaping another ALTER TABLE.
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
#
# Note that we can't easily check SNW vs SNW locks since
# SNW is only used by ALTER TABLE after upgrading from SU
# and SU is also incompatible with SNW.
#
connection default;
set debug_sync= 'alter_table_copy_after_lock_upgrade SIGNAL locked WAIT_FOR finish';
# Sending:
alter table t1 add primary key (c1), lock=shared, algorithm=copy;;
#
connection mdl_con1;
set debug_sync= 'now WAIT_FOR locked';
# Check that SNRW lock is incompatible with SNW lock.
# Sending:
lock table t1 write;;
#
connection mdl_con2;
# Check that the above LOCK TABLES is blocked because of SNW lock.
# Unblock ALTER and thus LOCK TABLES.
set debug_sync= 'now SIGNAL finish';
#
connection default;
# Reaping ALTER TABLE.
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
#
connection mdl_con1;
# Reaping LOCK TABLES
insert into t1 values (1);
unlock tables;
#
connection default;
set debug_sync= 'alter_table_copy_after_lock_upgrade SIGNAL locked WAIT_FOR finish';
# Sending:
alter table t1 add primary key (c1), algorithm=copy, lock=shared;;
#
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;;
#
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';
#
connection default;
# Reaping ALTER TABLE.
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
#
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.
#
connection default;
#
#
# 7) Acquire SNRW lock on the table.
#
#
lock table t1 write;
#
connection mdl_con1;
# Check that S and SH locks are compatible with it.
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;;
#
connection default;
# Check that the above SELECT is blocked because of SNRW lock.
# Unblock SELECT.
unlock tables;
#
connection mdl_con1;
# Reaping SELECT.
count(*)
3
#
connection default;
lock table t1 write;
#
connection mdl_con1;
# Check that SW lock is incompatible with SNRW lock.
# Sending:
delete from t1 limit 1;;
#
connection default;
# Check that the above DELETE is blocked because of SNRW lock.
# Unblock DELETE.
unlock tables;
#
connection mdl_con1;
# Reaping DELETE.
#
connection default;
lock table t1 write;
#
connection mdl_con1;
# Check that SU lock is incompatible with SNRW lock.
# Sending:
alter table t1 add primary key (c1);;
#
connection default;
# Check that the above ALTER is blocked because of SNRW lock.
# Unblock ALTER.
unlock tables;
#
connection mdl_con1;
# Reaping ALTER TABLE.
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
#
# Note that we can't easily check SNW vs SNRW locks since
# SNW is only used by ALTER TABLE after upgrading from SU
# and SU is also incompatible with SNRW.
#
connection default;
lock table t1 write;
#
connection mdl_con1;
# Check that SNRW lock is incompatible with SNRW lock.
# Sending:
lock table t1 write;;
#
connection default;
# Check that the above LOCK TABLES is blocked because of SNRW lock.
# Unblock waiting LOCK TABLES.
unlock tables;
#
connection mdl_con1;
# Reaping LOCK TABLES
insert into t1 values (1);
unlock tables;
#
connection default;
lock table t1 write;
#
connection mdl_con1;
# Check that X lock is incompatible with SNRW lock.
# Sending:
rename table t1 to t2;;
#
connection default;
# Check that the above RENAME is blocked because of SNRW lock.
# Unblock RENAME TABLE
unlock tables;
#
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.
#
connection default;
#
#
# 8) 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);
#
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;
#
connection default;
# Sending:
rename table t1 to t2;;
#
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;;
#
connection mdl_con2;
# Check that the above HANDLER statement is blocked because of X lock.
# Unblock RENAME TABLE
unlock tables;
#
connection default;
# Reaping RENAME TABLE.
ERROR 42S01: Table 't2' already exists
#
connection mdl_con1;
# Reaping HANDLER.
handler t1 close;
#
connection mdl_con2;
# Prepare for blocking RENAME TABLE.
lock tables t2 read;
#
connection default;
# Sending:
rename table t1 to t2;;
#
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';;
#
connection mdl_con2;
# Check that the above SELECT ... FROM I_S ... statement is blocked
# because of X lock.
# Unblock RENAME TABLE
unlock tables;
#
connection default;
# Reaping RENAME TABLE.
ERROR 42S01: Table 't2' already exists
#
connection mdl_con1;
# Reaping SELECT ... FROM I_S.
column_name
c1
#
connection mdl_con2;
# Prepare for blocking RENAME TABLE.
lock tables t2 read;
#
connection default;
# Sending:
rename table t1 to t2;;
#
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;;
#
connection mdl_con2;
# Check that the above SELECT statement is blocked
# because of X lock.
# Unblock RENAME TABLE
unlock tables;
#
connection default;
# Reaping RENAME TABLE.
ERROR 42S01: Table 't2' already exists
#
connection mdl_con1;
# Reaping SELECT.
count(*)
3
#
connection mdl_con2;
# Prepare for blocking RENAME TABLE.
lock tables t2 read;
#
connection default;
# Sending:
rename table t1 to t2;;
#
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;;
#
connection mdl_con2;
# Check that the above DELETE statement is blocked
# because of X lock.
# Unblock RENAME TABLE
unlock tables;
#
connection default;
# Reaping RENAME TABLE.
ERROR 42S01: Table 't2' already exists
#
connection mdl_con1;
# Reaping DELETE.
#
connection mdl_con2;
# Prepare for blocking RENAME TABLE.
lock tables t2 read;
#
connection default;
# Sending:
rename table t1 to t2;;
#
connection mdl_con1;
# Check that RENAME has acquired X lock on t1 and is waiting for t2.
# Check that SU lock is incompatible with X lock.
# Sending:
alter table t1 add primary key (c1);;
#
connection mdl_con2;
# Check that the above ALTER statement is blocked
# because of X lock.
# Unblock RENAME TABLE
unlock tables;
#
connection default;
# Reaping RENAME TABLE
ERROR 42S01: Table 't2' already exists
#
connection mdl_con1;
# Reaping ALTER.
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
#
# Note that we can't easily check SNW vs X locks since
# SNW is only used by ALTER TABLE after upgrading from SU
# and SU is also incompatible with X.
#
connection mdl_con2;
# Prepare for blocking RENAME TABLE.
lock tables t2 read;
#
connection default;
# Sending:
rename table t1 to t2;;
#
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;;
#
connection mdl_con2;
# Check that the above LOCK TABLE statement is blocked
# because of X lock.
# Unblock RENAME TABLE
unlock tables;
#
connection default;
# Reaping RENAME TABLE
ERROR 42S01: Table 't2' already exists
#
connection mdl_con1;
# Reaping LOCK TABLE.
unlock tables;
#
connection mdl_con2;
# Prepare for blocking RENAME TABLE.
lock tables t2 read;
#
connection default;
# Sending:
rename table t1 to t2;;
#
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;;
#
connection mdl_con2;
# Check that the above RENAME statement is blocked
# because of X lock.
# Unblock RENAME TABLE
unlock tables;
#
connection default;
# Reaping RENAME TABLE
ERROR 42S01: Table 't2' already exists
#
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.
#
# Note: No tests for pending SU lock as this lock requires
# even stronger active or pending lock.
#
#
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);
#
connection default;
# Add pending SNW lock.
# Sending:
alter table t1 add primary key (c1);;
#
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(*)
3
# Check that SW is incompatible with pending SNW
# Sending:
delete from t1 limit 1;;
#
connection mdl_con2;
# Check that the above DELETE is blocked because of pending SNW lock.
# Unblock ALTER TABLE.
commit;
#
connection default;
# Reaping ALTER.
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
#
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.
#
#
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(*)
2
#
connection default;
# Add pending SNRW lock.
# Sending:
lock table t1 write;;
#
connection mdl_con1;
# Check that LOCK TABLE is waiting with pending SNRW lock.
# Check that S and SH locks are compatible with pending SNRW
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;;
#
connection mdl_con2;
# Check that the above SELECT is blocked because of pending SNRW lock.
# Unblock LOCK TABLE.
commit;
#
connection default;
# Reaping LOCK TABLE.
unlock tables;
#
connection mdl_con1;
# Reaping SELECT.
count(*)
2
# Restore pending SNRW lock.
#
connection mdl_con2;
begin;
select count(*) from t1;
count(*)
2
#
connection default;
# Sending:
lock table t1 write;;
#
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);;
#
connection mdl_con2;
# Check that the above INSERT is blocked because of pending SNRW lock.
# Unblock LOCK TABLE.
commit;
#
connection default;
# Reaping LOCK TABLE.
unlock tables;
#
connection mdl_con1;
# Reaping INSERT.
# Restore pending SNRW lock.
#
connection mdl_con2;
begin;
select count(*) from t1;
count(*)
3
#
connection default;
# Sending:
lock table t1 write;;
#
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'
#
connection mdl_con2;
# Unblock LOCK TABLE.
commit;
#
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.
#
#
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(*)
3
#
connection default;
# Add pending X lock.
# Sending:
rename table t1 to t2;;
#
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;;
#
connection mdl_con2;
# Check that the above HANDLER OPEN is blocked because of pending X lock.
# Unblock RENAME TABLE.
commit;
#
connection default;
# Reaping RENAME TABLE.
ERROR 42S01: Table 't2' already exists
#
connection mdl_con1;
# Reaping HANDLER t1 OPEN.
handler t1 close;
# Restore pending X lock.
#
connection mdl_con2;
begin;
select count(*) from t1;
count(*)
3
#
connection default;
# Add pending X lock.
# Sending:
rename table t1 to t2;;
#
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;;
#
connection mdl_con2;
# Check that the above SELECT is blocked because of pending X lock.
# Unblock RENAME TABLE.
commit;
#
connection default;
# Reaping RENAME TABLE.
ERROR 42S01: Table 't2' already exists
#
connection mdl_con1;
# Reaping SELECT.
count(*)
3
# Restore pending X lock.
#
connection mdl_con2;
begin;
select count(*) from t1;
count(*)
3
#
connection default;
# Add pending X lock.
# Sending:
rename table t1 to t2;;
#
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;;
#
connection mdl_con2;
# Check that the above DELETE is blocked because of pending X lock.
# Unblock RENAME TABLE.
commit;
#
connection default;
# Reaping RENAME TABLE.
ERROR 42S01: Table 't2' already exists
#
connection mdl_con1;
# Reaping DELETE.
# Restore pending X lock.
#
connection mdl_con2;
begin;
select count(*) from t1;
count(*)
2
#
connection default;
# Add pending X lock.
# Sending:
rename table t1 to t2;;
#
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);;
#
connection mdl_con2;
# Check that the above ALTER TABLE is blocked because of pending X lock.
# Unblock RENAME TABLE.
commit;
#
connection default;
# Reaping RENAME TABLE.
ERROR 42S01: Table 't2' already exists
#
connection mdl_con1;
# Reaping ALTER TABLE.
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
# Restore pending X lock.
#
connection mdl_con2;
handler t1 open;
#
connection default;
# Add pending X lock.
# Sending:
rename table t1 to t2;;
#
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;;
#
connection mdl_con3;
# Check that the above LOCK TABLES is blocked because of pending X lock.
#
connection mdl_con2;
# Unblock RENAME TABLE.
handler t1 close;
#
connection default;
# Reaping RENAME TABLE.
ERROR 42S01: Table 't2' already exists
#
connection mdl_con1;
# Reaping LOCK TABLES.
unlock tables;
#
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.
#
# Note: No tests for active/pending SU lock since
# ALTER TABLE is in its own transaction.
#
#
# 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(*)
2
#
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= 'alter_table_copy_after_lock_upgrade SIGNAL locked WAIT_FOR finish';
# Sending:
alter table t2 add primary key (c1), algorithm=copy, lock=shared;;
#
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(*)
2
# Sending:
insert into t2 values (1);;
#
connection mdl_con2;
# Check that the above INSERT is blocked.
# Unblock ALTER TABLE and thus INSERT.
set debug_sync= 'now SIGNAL finish';
#
connection mdl_con1;
# Reap ALTER TABLE.
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
#
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(*)
2
#
connection mdl_con1;
# Create an active SNW lock on t1.
set debug_sync= 'alter_table_copy_after_lock_upgrade SIGNAL locked WAIT_FOR finish';
# Sending:
alter table t1 add primary key (c1), algorithm=copy, lock=shared;;
#
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(*)
2
# 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);;
#
connection mdl_con2;
# Check that the above INSERT is blocked.
# Unblock ALTER TABLE and thus INSERT.
set debug_sync= 'now SIGNAL finish';
#
connection mdl_con1;
# Reap ALTER TABLE.
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
#
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);
#
connection mdl_con1;
# Create pending SNW lock on t1.
# Sending:
alter table t1 add primary key (c1);;
#
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(*)
4
delete from t1 limit 1;
# Unblock ALTER TABLE.
commit;
#
connection mdl_con1;
# Reap ALTER TABLE.
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
#
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(*)
3
#
connection mdl_con2;
# Start transaction which will prevent SNW -> X upgrade from
# completing immediately.
begin;
select count(*) from t2;
count(*)
3
#
connection mdl_con1;
# Create SNW lock pending upgrade to X on t2.
# Sending:
alter table t2 add column c2 int;;
#
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;;
#
connection mdl_con2;
# Check that the above SELECT is blocked.
# Unblock ALTER TABLE.
commit;
#
connection mdl_con1;
# Reap ALTER TABLE.
#
connection default;
# Reap SELECT.
count(*)
3
commit;
# Do similar check for SW lock.
begin;
select count(*) from t1;
count(*)
3
#
connection mdl_con2;
# Start transaction which will prevent SNW -> X upgrade from
# completing immediately.
begin;
select count(*) from t2;
count(*)
3
#
connection mdl_con1;
# Create SNW lock pending upgrade to X on t2.
# Sending:
alter table t2 drop column c2;;
#
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);;
#
connection mdl_con2;
# Check that the above INSERT is blocked.
# Unblock ALTER TABLE.
commit;
#
connection mdl_con1;
# Reap ALTER TABLE.
#
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(*)
3
#
connection mdl_con1;
# Create SNW lock pending upgrade to X.
# Sending:
alter table t1 add column c2 int;;
#
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(*)
3
# 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;
#
connection mdl_con1;
# Reap ALTER TABLE.
#
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(*)
3
#
connection mdl_con1;
lock table t2 write;
#
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;;
#
connection mdl_con1;
# Check that the above SELECT is blocked
# Unblock SELECT.
unlock tables;
#
connection default;
# Reap SELECT.
count(*)
4
commit;
# Repeat the same test for SW lock.
begin;
select count(*) from t1;
count(*)
3
#
connection mdl_con1;
lock table t2 write;
#
connection default;
# Again attempt to acquire SW should be blocked and should
# not cause any errors.
# Sending:
delete from t2 limit 1;;
#
connection mdl_con1;
# Check that the above DELETE is blocked
# Unblock DELETE.
unlock tables;
#
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(*)
3
#
connection mdl_con1;
# Sending:
lock table t1 write;;
#
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(*)
3
# 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;
#
connection mdl_con1;
# Reap LOCK TABLES.
unlock tables;
#
connection default;
#
# **) Now case when transaction has a SW lock.
#
begin;
delete from t1 limit 1;
#
connection mdl_con1;
# Sending:
lock table t1 write;;
#
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(*)
2
insert into t1 values (1, 1);
# Unblock LOCK TABLES.
commit;
#
connection mdl_con1;
# Reap LOCK TABLES.
unlock tables;
#
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(*)
3
#
connection mdl_con2;
# Start transaction which will prevent X lock from going away
# immediately.
begin;
select count(*) from t2;
count(*)
3
#
connection mdl_con1;
# Create pending X lock on t2.
# Sending:
rename table t2 to t3;;
#
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;;
#
connection mdl_con2;
# Check that the above SELECT is blocked.
# Unblock RENAME TABLE.
commit;
#
connection mdl_con1;
# Reap RENAME TABLE.
#
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(*)
3
#
connection mdl_con2;
# Start transaction which will prevent X lock from going away
# immediately.
begin;
select count(*) from t2;
count(*)
3
#
connection mdl_con1;
# Create pending X lock on t2.
# Sending:
rename table t2 to t3;;
#
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;;
#
connection mdl_con2;
# Check that the above DELETE is blocked.
# Unblock RENAME TABLE.
commit;
#
connection mdl_con1;
# Reap RENAME TABLE.
#
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(*)
3
#
connection mdl_con1;
# Sending:
rename table t1 to t2;;
#
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(*)
3
# 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;
#
connection mdl_con1;
# Reap RENAME TABLE.
ERROR 42S01: Table 't2' already exists
#
connection default;
#
# **) The second case is when transaction has a SW lock.
#
begin;
delete from t1 limit 1;
#
connection mdl_con1;
# Sending:
rename table t1 to t2;;
#
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(*)
2
insert into t1 values (1, 1);
# Unblock RENAME TABLE.
commit;
#
connection mdl_con1;
# Reap RENAME TABLE.
ERROR 42S01: Table 't2' already exists
#
connection default;
# Clean-up.
disconnect mdl_con1;
disconnect mdl_con2;
disconnect mdl_con3;
set debug_sync= 'RESET';
drop table t1, t2;
#
# Test coverage for basic deadlock detection in metadata
# locking subsystem.
#
drop tables if exists t0, t1, t2, t3, t4, t5;
set debug_sync= 'RESET';
connect deadlock_con1,localhost,root,,;
connect deadlock_con2,localhost,root,,;
connect deadlock_con3,localhost,root,,;
connection default;
create table t1 (i int);
create table t2 (j int);
create table t3 (k int);
create table t4 (k int);
#
# Test for the case in which no deadlock occurs.
#
#
connection deadlock_con1;
begin;
insert into t1 values (1);
#
connection deadlock_con2;
begin;
insert into t2 values (1);
#
connection default;
# Send:
rename table t2 to t0, t3 to t2, t0 to t3;;
#
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;;
#
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;
#
connection default;
# Reap RENAME TABLE.
#
connection deadlock_con1;
# Reap SELECT.
k
#
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;;
#
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;
#
connection default;
# Reap RENAME TABLE.
#
# Test for case when deadlock occurs and should be detected immediately.
#
#
connection deadlock_con1;
begin;
insert into t2 values (2);
#
connection default;
# Send:
rename table t2 to t0, t1 to t2, t0 to t1;;
#
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 and
# transaction should be rolled back.
select * from t1;
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
#
connection default;
# Reap RENAME TABLE.
#
# Test for the case in which deadlock also occurs but not immediately.
#
#
connection deadlock_con1;
begin;
insert into t2 values (1);
#
connection default;
lock table t1 write;
#
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;;
#
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;;
#
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;
#
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 and transaction should be rolled back.
# Reap SELECT * FROM t1.
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
#
connection deadlock_con2;
# Reap RENAME TABLE ... .
#
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
#
connection deadlock_con1;
begin;
select * from t1;
i
1
#
connection default;
# Send:
alter table t1 add column j int, rename to t2;;
#
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 and transaction
# should be rolled back.
select * from t2;
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
#
connection default;
# Reap ALTER TABLE ... RENAME.
drop table t2;
#
# Test that in situation when MDL subsystem detects a deadlock
# but it turns out that it can be resolved by backing-off locks
# acquired by one of participating transactions (which is
# possible when one of transactions consists only of currently
# executed statement, e.g. in autocommit mode) no error is
# reported.
#
create table t1 (i int);
create table t2 (j int);
# Ensure that the below SELECT stops once it has acquired metadata
# lock on table 't2'.
set debug_sync= 'after_open_table_mdl_shared SIGNAL locked WAIT_FOR finish';
# Sending:
select * from t2, t1;
#
connection deadlock_con1;
# Wait till SELECT acquires MDL on 't2' and starts waiting for signal.
set debug_sync= 'now WAIT_FOR locked';
# Sending:
lock tables t1 write, t2 write;
#
connection deadlock_con2;
# Wait until LOCK TABLES acquires SNRW lock on 't1' and is blocked
# while trying to acquire SNRW lock on 't1'.
# Resume SELECT execution, this should eventually unblock LOCK TABLES.
set debug_sync= 'now SIGNAL finish';
#
connection deadlock_con1;
# Reaping LOCK TABLES.
unlock tables;
#
connection default;
# Reaping SELECT. It succeed and not report ER_LOCK_DEADLOCK error.
j i
drop tables t1, t2;
#
# Test coverage for situation in which a race has happened
# during deadlock detection process which led to unwarranted
# ER_LOCK_DEADLOCK error.
#
create table t1 (i int);
# Ensure that ALTER waits once it has acquired SNW lock.
set debug_sync='alter_table_copy_after_lock_upgrade SIGNAL parked1 WAIT_FOR go1';
# Sending:
alter table t1 add column j int;
#
connection deadlock_con1;
# Wait till ALTER acquires SNW lock and stops.
set debug_sync='now WAIT_FOR parked1';
# Ensure that INSERT is paused once it detects that there is
# a conflicting metadata lock so it has to wait, but before
# deadlock detection is run.
set debug_sync='mdl_acquire_lock_wait SIGNAL parked2 WAIT_FOR go2';
# Sending:
insert into t1 values ();
#
connection deadlock_con2;
# Wait till INSERT is paused.
set debug_sync='now WAIT_FOR parked2';
# Resume ALTER execution. Eventually it will release its
# metadata lock and INSERT's request for SW lock will be
# satisified.
set debug_sync='now SIGNAL go1';
#
connection default;
# Reaping ALTER TABLE.
# Add a new request for SNW lock to waiting graph.
# Sending:
alter table t1 drop column j;
#
connection deadlock_con2;
# Wait until ALTER is blocked.
# Resume INSERT so it can start deadlock detection.
#
# At this point there is a discrepancy between the fact that INSERT's
# SW lock is already satisfied, but INSERT's connection is still
# marked as waiting for it. Looking for a loop in waiters graph
# without additional checks has detected a deadlock (INSERT waits
# for SW lock; which is not granted because of pending SNW lock from
# ALTER; which waits for active SW lock from INSERT). Since requests
# for SW and SNW locks have same weight ALTER was selected as a victim
# and ended with ER_LOCK_DEADLOCK error.
set debug_sync='now SIGNAL go2';
#
connection deadlock_con1;
# Reaping INSERT.
#
connection default;
# Reaping ALTER. It should succeed and not produce ER_LOCK_DEADLOCK.
drop table t1;
#
# Now, test for a situation in which deadlock involves waiting not
# only in MDL subsystem but also for TDC. Such deadlocks should be
# successfully detected. If possible, they should be resolved without
# resorting to ER_LOCK_DEADLOCK error.
#
create table t1(i int);
create table t2(j int);
#
# First, let us check how we handle a simple scenario involving
# waits in MDL and TDC.
#
set debug_sync= 'RESET';
connection deadlock_con1;
# Start a statement, which will acquire SR metadata lock on t1, open it
# and then stop, before trying to acquire SW lock on t2 and opening it.
set debug_sync='open_tables_after_open_and_process_table SIGNAL parked WAIT_FOR go';
# Sending:
select * from t1 where i in (select j from t2 for update);
connection deadlock_con2;
# Wait till the above SELECT stops.
set debug_sync='now WAIT_FOR parked';
# The below FLUSH TABLES WITH READ LOCK should acquire
# SNW locks on t1 and t2 and wait till SELECT closes t1.
# Sending:
flush tables t1, t2 with read lock;
connection deadlock_con3;
# Wait until FLUSH TABLES WITH t1, t2 READ LOCK starts waiting
# for SELECT to close t1.
# Resume SELECT, so it tries to acquire SW lock on t1 and blocks,
# creating a deadlock. This deadlock should be detected and resolved
# by backing-off SELECT. As a result FTWRL should be able to finish.
set debug_sync='now SIGNAL go';
connection deadlock_con2;
# Reap FLUSH TABLES WITH READ LOCK.
unlock tables;
connection deadlock_con1;
# Reap SELECT.
i
#
# The same scenario with a slightly different order of events
# which emphasizes that setting correct deadlock detector weights
# for flush waits is important.
#
set debug_sync= 'RESET';
connection deadlock_con2;
set debug_sync='flush_tables_with_read_lock_after_acquire_locks SIGNAL parked WAIT_FOR go';
# The below FLUSH TABLES WITH READ LOCK should acquire
# SNW locks on t1 and t2 and wait on debug sync point.
# Sending:
flush tables t1, t2 with read lock;
connection deadlock_con1;
# Wait till FLUSH TABLE WITH READ LOCK stops.
set debug_sync='now WAIT_FOR parked';
# Start statement which will acquire SR metadata lock on t1, open
# it and then will block while trying to acquire SW lock on t2.
# Sending:
select * from t1 where i in (select j from t2 for update);
connection deadlock_con3;
# Wait till the above SELECT blocks.
# Resume FLUSH TABLES, so it tries to flush t1, thus creating
# a deadlock. This deadlock should be detected and resolved by
# backing-off SELECT. As a result FTWRL should be able to finish.
set debug_sync='now SIGNAL go';
connection deadlock_con2;
# Reap FLUSH TABLES WITH READ LOCK.
unlock tables;
connection deadlock_con1;
# Reap SELECT.
i
#
# Now a more complex scenario involving two connections
# waiting for MDL and one for TDC.
#
set debug_sync= 'RESET';
connection deadlock_con1;
# Start a statement which will acquire SR metadata lock on t2, open it
# and then stop, before trying to acquire SR on t1 and opening it.
set debug_sync='open_tables_after_open_and_process_table SIGNAL parked WAIT_FOR go';
# Sending:
select * from t2, t1;
connection deadlock_con2;
# Wait till the above SELECT stops.
set debug_sync='now WAIT_FOR parked';
# The below FLUSH TABLES WITH READ LOCK should acquire
# SNW locks on t2 and wait till SELECT closes t2.
# Sending:
flush tables t2 with read lock;
connection deadlock_con3;
# Wait until FLUSH TABLES WITH READ LOCK starts waiting
# for SELECT to close t2.
# The below DROP TABLES should acquire X lock on t1 and start
# waiting for X lock on t2.
# Sending:
drop tables t1, t2;
connection default;
# Wait until DROP TABLES starts waiting for X lock on t2.
# Resume SELECT, so it tries to acquire SR lock on t1 and blocks,
# creating a deadlock. This deadlock should be detected and resolved
# by backing-off SELECT. As a result, FTWRL should be able to finish.
set debug_sync='now SIGNAL go';
connection deadlock_con2;
# Reap FLUSH TABLES WITH READ LOCK.
# Unblock DROP TABLES.
unlock tables;
connection deadlock_con3;
# Reap DROP TABLES.
connection deadlock_con1;
# Reap SELECT. It should emit error about missing table.
ERROR 42S02: Table 'test.t2' doesn't exist
connection default;
set debug_sync= 'RESET';
disconnect deadlock_con1;
disconnect deadlock_con2;
disconnect deadlock_con3;
#
# Test for a scenario in which FLUSH TABLES <list> WITH READ LOCK
# used to erroneously release metadata locks.
#
connect con1,localhost,root,,;
connect con2,localhost,root,,;
connection default;
drop tables if exists t1, t2;
set debug_sync= 'RESET';
create table t1(i int);
create table t2(j int);
connection con2;
set debug_sync='open_tables_after_open_and_process_table SIGNAL parked WAIT_FOR go';
# The below FLUSH TABLES <list> WITH READ LOCK should acquire
# SNW locks on t1 and t2, open table t1 and block on the debug
# sync point.
# Sending:
flush tables t1, t2 with read lock;
connection con1;
# Wait till FLUSH TABLES <list> WITH READ LOCK stops.
set debug_sync='now WAIT_FOR parked';
flush tables;
# Start a statement which will flush all tables and thus
# invalidate table t1 open by FLUSH TABLES <list> WITH READ LOCK.
# Sending:
flush tables t1;
connection default;
# Wait till the above FLUSH TABLES blocks.
# Resume FLUSH TABLES <list> WITH READ LOCK, so it tries to open t2
# discovers that its t1 is obsolete and tries to reopen all tables.
# Such reopen should not cause releasing of SNW metadata locks
# which would result in assertion failures.
set debug_sync='now SIGNAL go';
connection con2;
# Reap FLUSH TABLES <list> WITH READ LOCK.
unlock tables;
connection con1;
# Reap FLUSH TABLES.
# Clean-up.
connection default;
drop tables t1, t2;
set debug_sync= 'RESET';
disconnect con1;
disconnect con2;
#
# 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.
connect con1root,localhost,root,,test,,;
connect con2root,localhost,root,,test,,;
connection default;
create table t1 (i int);
create table t2 (j int);
create table t3 (k int);
create table t4 (l int);
create trigger t1_bi before insert on t1 for each row
insert into t2 values (new.i);
create trigger t2_bi before insert on t2 for each row
insert into t3 values (new.j);
#
connection con1root;
lock tables t4 read;
#
connection con2root;
# Send :
rename table t3 to t5, t4 to t3;;
#
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);;
#
connection con1root;
# Wait until INSERT statement waits due to encountering pending
# exclusive metadata lock on 't3'.
unlock tables;
#
connection con2root;
# Reap RENAME TABLE.
#
connection default;
# Reap INSERT.
# Clean-up.
disconnect con1root;
disconnect con2root;
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;
connect con2, localhost, root,,;
#
# Test 1: CREATE TABLE
#
connection con2;
# 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 default;
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));
# Insert fails
connection con2;
ERROR 42S02: Table 'test.t1' doesn't exist
connection default;
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 con2;
# 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 default;
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;
# Insert fails
connection con2;
ERROR 42S02: Table 'test.t1' doesn't exist
connection default;
SET DEBUG_SYNC= 'RESET';
SHOW TABLES;
Tables_in_test
t1
t2
DROP TABLE t2;
disconnect con2;
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;
connect con46044, localhost, root,,;
connect con46044_2, localhost, root,,;
connect con46044_3, localhost, root,,;
connection default;
create table t1 (i int);
insert into t1 values(1);
# 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;
connection con46044_2;
# Sending:
update t1 set i = 2;
connection con46044;
# Waiting until UPDATE t1 SET ... is blocked.
# Sending:
create table t2 select * from t1;;
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 concurrent DDL statement
Warnings:
Warning 1684 Table 'test'.'t2' was skipped since its definition is being modified by concurrent DDL statement
connection default;
unlock tables;
connection con46044;
# Reaping CREATE TABLE ... SELECT ... .
drop table t2;
connection con46044_2;
# Reaping UPDATE t1 statement
#
# 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.
connection con46044_2;
lock tables t1 read;
connection con46044_3;
# Sending:
update t1 set i = 3;
connection con46044;
# Waiting until UPDATE t1 SET ... is blocked.
# Sending:
create table t2 select * from t1;;
connection default;
# Waiting until CREATE TABLE ... SELECT ... is blocked.
# Let us check that SHOW FIELDS/DESCRIBE gets blocked.
# Sending:
show fields from t2;;
connection con46044_2;
# Wait until SHOW FIELDS gets blocked.
unlock tables;
connection con46044;
# Reaping CREATE TABLE ... SELECT ... .
connection default;
# Reaping SHOW FIELDS ...
Field Type Null Key Default Extra
i int(11) YES NULL
drop table t2;
connection con46044_3;
# Reaping UPDATE t1 statement
connection con46044_2;
lock tables t1 read;
connection con46044_3;
# Sending:
update t1 set i = 4;
connection con46044;
# Waiting until UPDATE t1 SET ... is blocked.
# Sending:
create table t2 select * from t1;;
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';;
connection con46044_2;
# Wait until SELECT COLUMN_NAME FROM I_S.COLUMNS gets blocked.
unlock tables;
connection con46044;
# Reaping CREATE TABLE ... SELECT ... .
connection default;
# Reaping SELECT COLUMN_NAME FROM I_S.COLUMNS
column_name
i
drop table t2;
connection con46044_3;
# Reaping UPDATE t1 statement
connection con46044_2;
lock tables t1 read;
connection con46044_3;
# Sending:
update t1 set i = 5;
connection con46044;
# Waiting until UPDATE t1 SET ... is blocked.
# Sending:
create table t2 select * from t1;;
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';;
connection con46044_2;
# Wait until SELECT ... FROM I_S.TABLES gets blocked.
unlock tables;
connection con46044;
# Reaping CREATE TABLE ... SELECT ... .
connection default;
# Reaping SELECT ... FROM I_S.TABLES
table_name table_type auto_increment table_comment
t2 BASE TABLE NULL
drop table t2;
connection con46044_3;
# Reaping UPDATE t1 statement
connection default;
# Clean-up.
disconnect con46044;
disconnect con46044_2;
disconnect con46044_3;
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';
connect con46273,localhost,root,,test,,;
connection default;
create table t1 (c1 int primary key, c2 int, c3 int);
insert into t1 values (1,1,0),(2,2,0),(3,3,0),(4,4,0),(5,5,0);
begin;
select * from t1 where c2 = 3;
c1 c2 c3
3 3 0
#
connection con46273;
set debug_sync='alter_table_copy_after_lock_upgrade SIGNAL alter_table_locked WAIT_FOR alter_go';
alter table t1 add column e int, rename to t2;;
#
connection default;
set debug_sync='now WAIT_FOR alter_table_locked';
set debug_sync='mdl_acquire_lock_wait 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
#
connection con46273;
# Reap ALTER TABLE.
#
connection default;
disconnect con46273;
# 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;
connect con46673, localhost, root,,;
connection default;
create table t1 (i int);
connection con46673;
begin;
insert into t1 values (1);
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;
connection con46673;
delete from t1 where i = 1;
commit;
connection default;
# Clean-up
disconnect con46673;
drop table t1;
#
# Bug#48210 FLUSH TABLES WITH READ LOCK deadlocks
# against concurrent CREATE PROCEDURE
#
connect con2, localhost, root;
# Test 1: CREATE PROCEDURE
connection default;
# 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 con2;
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= 'mdl_acquire_lock_wait SIGNAL grlwait';
FLUSH TABLES WITH READ LOCK;
connection default;
connection con2;
UNLOCK TABLES;
connection default;
SET DEBUG_SYNC= 'RESET';
# Test 2: DROP PROCEDURE
connection default;
# Start DROP PROCEDURE and open tables
SET DEBUG_SYNC= 'after_open_table_mdl_shared SIGNAL table_opened WAIT_FOR grlwait';
DROP PROCEDURE p1;
connection con2;
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= 'mdl_acquire_lock_wait SIGNAL grlwait';
FLUSH TABLES WITH READ LOCK;
connection default;
# Once FLUSH TABLES WITH READ LOCK starts waiting
# DROP PROCEDURE will be waked up and will drop
# procedure. Global read lock will be granted after
# this statement ends.
#
# Reaping DROP PROCEDURE.
connection con2;
# Reaping FTWRL.
UNLOCK TABLES;
connection default;
SET DEBUG_SYNC= 'RESET';
disconnect con2;
#
# Bug#50786 Assertion `thd->mdl_context.trans_sentinel() == __null'
# failed in open_ltable()
#
# Supress warnings written to the log file
call mtr.add_suppression("Wait on a lock was aborted due to a pending exclusive lock");
DROP TABLE IF EXISTS t1, t2;
connect con1,localhost,root;
connect con2,localhost,root;
connect con3,localhost,root;
connection default;
CREATE TABLE t1 (i INT);
CREATE TABLE t2 (i INT);
SET @old_general_log= @@global.general_log;
SET @@global.general_log= 1;
SET @old_log_output= @@global.log_output;
SET @@global.log_output= 'TABLE';
SET @old_sql_log_off= @@session.sql_log_off;
SET @@session.sql_log_off= 1;
# connection: con1
connection con1;
HANDLER t1 OPEN;
# connection: con3
connection con3;
SET @@session.sql_log_off= 1;
# connection: con2
connection con2;
SET DEBUG_SYNC= 'thr_multi_lock_after_thr_lock SIGNAL parked WAIT_FOR go';
# Sending:
SELECT 1;
# connection: con3
connection con3;
SET DEBUG_SYNC= 'now WAIT_FOR parked';
# connection: con1
connection con1;
# Sending:
SELECT 1;
# connection: con3
connection con3;
ALTER TABLE t1 ADD COLUMN j INT;
# connection: default
connection default;
SET DEBUG_SYNC= 'now SIGNAL go';
# connection: con1
connection con1;
# Reaping SELECT 1
1
1
HANDLER t1 CLOSE;
# connection: con2
connection con2;
# Reaping SELECT 1
1
1
# connection: default
connection default;
DROP TABLE t1, t2;
SET DEBUG_SYNC= 'RESET';
disconnect con1;
disconnect con2;
disconnect con3;
SET @@global.general_log= @old_general_log;
SET @@global.log_output= @old_log_output;
SET @@session.sql_log_off= @old_sql_log_off;
#
# 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';
connect con50913_1,localhost,root;
connect con50913_2,localhost,root;
connection default;
create table t1 (i int) engine=InnoDB;
connection con50913_1;
set debug_sync= 'alter_table_copy_after_lock_upgrade SIGNAL parked WAIT_FOR go';
# Sending:
alter table t1 add column j int, ALGORITHM=COPY;
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;
connection con50913_2;
# Wait until TRUNCATE TABLE is blocked on MDL lock.
# Unblock ALTER TABLE.
set debug_sync= 'now SIGNAL go';
connection con50913_1;
# Reaping ALTER TABLE.
connection default;
# Reaping TRUNCATE TABLE.
disconnect con50913_1;
disconnect con50913_2;
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';
connect con1,localhost,root;
connect con2,localhost,root;
connect con3,localhost,root;
connection default;
create table t1 (i int);
connection con1;
begin;
select * from t1;
i
connection con2;
begin;
select * from t1;
i
connection default;
# Start ALTER TABLE which will acquire SNW lock and
# table lock and get blocked on sync point.
set debug_sync= 'alter_table_copy_after_lock_upgrade SIGNAL parked WAIT_FOR go';
# Sending:
alter table t1 add column j int;
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);
connection con2;
# Sending:
insert into t1 values (1);
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';
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;
connection con2;
# Reaping INSERT.
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
commit;
connection default;
# Reap ALTER TABLE.
disconnect con1;
disconnect con2;
disconnect con3;
connection default;
set debug_sync= 'RESET';
drop table t1;
#
# Bug#42643: InnoDB does not support replication of TRUNCATE TABLE
#
# Ensure that a acquired lock is not given up due to a conflict.
#
connect con1,localhost,root,,test,,;
connect con2,localhost,root,,test,,;
connect con3,localhost,root,,test,,;
connection default;
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (a INT) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1),(2),(3);
connection con1;
LOCK TABLES t1 WRITE;
SET debug_sync='upgrade_lock_for_truncate SIGNAL parked_truncate WAIT_FOR go_truncate';
TRUNCATE TABLE t1;
connection default;
SET debug_sync='now WAIT_FOR parked_truncate';
connection con2;
SET debug_sync='after_open_table_ignore_flush SIGNAL parked_show WAIT_FOR go_show';
SHOW FIELDS FROM t1;
connection default;
SET debug_sync='now WAIT_FOR parked_show';
connection con3;
SET debug_sync='after_flush_unlock SIGNAL parked_flush WAIT_FOR go_flush';
FLUSH TABLES t1;
connection default;
SET debug_sync='now WAIT_FOR parked_flush';
SET debug_sync='now SIGNAL go_truncate';
# Ensure that truncate waits for a exclusive lock
SET debug_sync= 'now SIGNAL go_show';
connection con1;
# Reaping...
UNLOCK TABLES;
connection con2;
# Reaping...
Field Type Null Key Default Extra
a int(11) YES NULL
connection default;
SET debug_sync= 'now SIGNAL go_flush';
connection con3;
# Reaping...
disconnect con1;
disconnect con2;
disconnect con3;
connection default;
SET debug_sync= 'RESET';
DROP TABLE t1;
#
# Bug#52856 concurrent show columns or show full columns causes a crash!!!
#
CREATE TABLE t1(a CHAR(255));
connect con1, localhost, root;
SET DEBUG_SYNC= "get_schema_column SIGNAL waiting WAIT_FOR completed";
SHOW FULL COLUMNS FROM t1;
connection default;
SET DEBUG_SYNC= "now WAIT_FOR waiting";
SHOW FULL COLUMNS FROM t1;
Field Type Collation Null Key Default Extra Privileges Comment
a char(255) latin1_swedish_ci YES NULL #
SET DEBUG_SYNC= "now SIGNAL completed";
connection con1;
Field Type Collation Null Key Default Extra Privileges Comment
a char(255) latin1_swedish_ci YES NULL #
connection default;
DROP TABLE t1;
disconnect con1;
#
# Tests for schema-scope locks
#
DROP DATABASE IF EXISTS db1;
DROP DATABASE IF EXISTS db2;
connect con2, localhost, root;
connect con3, localhost, root;
# Test 1:
# CREATE DATABASE blocks database DDL on the same database, but
# not database DDL on different databases. Tests X vs X lock.
#
connection default;
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
# Sending:
CREATE DATABASE db1;
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
# Sending:
CREATE DATABASE db1;
connection con3;
CREATE DATABASE db2;
ALTER DATABASE db2 DEFAULT CHARACTER SET utf8;
DROP DATABASE db2;
SET DEBUG_SYNC= 'now SIGNAL blocked';
connection default;
# Reaping: CREATE DATABASE db1
connection con2;
# Reaping: CREATE DATABASE db1
ERROR HY000: Can't create database 'db1'; database exists
# Test 2:
# ALTER DATABASE blocks database DDL on the same database, but
# not database DDL on different databases. Tests X vs X lock.
#
connection default;
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
# Sending:
ALTER DATABASE db1 DEFAULT CHARACTER SET utf8;
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
# Sending:
ALTER DATABASE db1 DEFAULT CHARACTER SET utf8;
connection con3;
CREATE DATABASE db2;
ALTER DATABASE db2 DEFAULT CHARACTER SET utf8;
DROP DATABASE db2;
SET DEBUG_SYNC= 'now SIGNAL blocked';
connection default;
# Reaping: ALTER DATABASE db1 DEFAULT CHARACTER SET utf8
connection con2;
# Reaping: ALTER DATABASE db1 DEFAULT CHARACTER SET utf8
connection default;
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
# Sending:
ALTER DATABASE db1 DEFAULT CHARACTER SET utf8;
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
# Sending:
DROP DATABASE db1;
connection con3;
SET DEBUG_SYNC= 'now SIGNAL blocked';
connection default;
# Reaping: ALTER DATABASE db1 DEFAULT CHARACTER SET utf8
connection con2;
# Reaping: DROP DATABASE db1
CREATE DATABASE db1;
# Test 3:
# Two ALTER..UPGRADE of the same database are mutually exclusive, but
# two ALTER..UPGRADE of different databases are not. Tests X vs X lock.
#
connection default;
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
# Sending:
ALTER DATABASE `#mysql50#a-b-c` UPGRADE DATA DIRECTORY NAME;
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
# Sending:
ALTER DATABASE `#mysql50#a-b-c` UPGRADE DATA DIRECTORY NAME;
connection con3;
ALTER DATABASE `#mysql50#a-b-c-d` UPGRADE DATA DIRECTORY NAME;
SET DEBUG_SYNC= 'now SIGNAL blocked';
connection default;
# Reaping: ALTER DATABASE '#mysql50#a-b-c' UPGRADE DATA DIRECTORY NAME
connection con2;
# Reaping: ALTER DATABASE '#mysql50#a-b-c' UPGRADE DATA DIRECTORY NAME
ERROR 42000: Unknown database '#mysql50#a-b-c'
DROP DATABASE `a-b-c`;
DROP DATABASE `a-b-c-d`;
# Test 4:
# DROP DATABASE blocks database DDL on the same database, but
# not database DDL on different databases. Tests X vs X lock.
#
connection default;
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
# Sending:
DROP DATABASE db1;
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
# Sending:
DROP DATABASE db1;
connection con3;
CREATE DATABASE db2;
ALTER DATABASE db2 DEFAULT CHARACTER SET utf8;
DROP DATABASE db2;
SET DEBUG_SYNC= 'now SIGNAL blocked';
connection default;
# Reaping: DROP DATABASE db1
connection con2;
# Reaping: DROP DATABASE db1
ERROR HY000: Can't drop database 'db1'; database doesn't exist
connection default;
CREATE DATABASE db1;
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
# Sending:
DROP DATABASE db1;
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
# Sending:
ALTER DATABASE db1 DEFAULT CHARACTER SET utf8;
connection con3;
SET DEBUG_SYNC= 'now SIGNAL blocked';
connection default;
# Reaping: DROP DATABASE db1
connection con2;
# Reaping: ALTER DATABASE db1 DEFAULT CHARACTER SET utf8
Got one of the listed errors
# Test 5:
# Locked database name prevents CREATE of tables in that database.
# Tests X vs IX lock.
#
connection default;
CREATE DATABASE db1;
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
# Sending:
DROP DATABASE db1;
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
# Sending:
CREATE TABLE db1.t1 (a INT);
connection con3;
SET DEBUG_SYNC= 'now SIGNAL blocked';
connection default;
# Reaping: DROP DATABASE db1
connection con2;
# Reaping: CREATE TABLE db1.t1 (a INT)
ERROR 42000: Unknown database 'db1'
# Test 6:
# Locked database name prevents RENAME of tables to/from that database.
# Tests X vs IX lock.
#
connection default;
CREATE DATABASE db1;
CREATE TABLE db1.t1 (a INT);
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
# Sending:
DROP DATABASE db1;
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
# Sending:
RENAME TABLE db1.t1 TO test.t1;
connection con3;
SET DEBUG_SYNC= 'now SIGNAL blocked';
connection default;
# Reaping: DROP DATABASE db1
connection con2;
# Reaping: RENAME TABLE db1.t1 TO test.t1
ERROR 42S02: Table 'db1.t1' doesn't exist
connection default;
CREATE DATABASE db1;
CREATE TABLE test.t2 (a INT);
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
# Sending:
DROP DATABASE db1;
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
# Sending:
RENAME TABLE test.t2 TO db1.t2;
connection con3;
SET DEBUG_SYNC= 'now SIGNAL blocked';
connection default;
# Reaping: DROP DATABASE db1
connection con2;
# Reaping: RENAME TABLE test.t2 TO db1.t2
Got one of the listed errors
DROP TABLE test.t2;
# Test 7:
# Locked database name prevents DROP of tables in that database.
# Tests X vs IX lock.
#
connection default;
CREATE DATABASE db1;
CREATE TABLE db1.t1 (a INT);
SET DEBUG_SYNC= 'after_wait_locked_schema_name SIGNAL locked WAIT_FOR blocked';
# Sending:
DROP DATABASE db1;
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
# Sending:
DROP TABLE db1.t1;
connection con3;
SET DEBUG_SYNC= 'now SIGNAL blocked';
connection default;
# Reaping: DROP DATABASE db1
connection con2;
# Reaping: DROP TABLE db1.t1
ERROR 42S02: Unknown table 'db1.t1'
connection default;
disconnect con2;
disconnect con3;
SET DEBUG_SYNC= 'RESET';
#
# End of tests for schema-scope locks
#
#
# Tests of granted global S lock (FLUSH TABLE WITH READ LOCK)
#
CREATE DATABASE db1;
CREATE TABLE db1.t1(a INT);
connect con2, localhost, root;
connect con3, localhost, root;
connection default;
FLUSH TABLE WITH READ LOCK;
connection con2;
CREATE TABLE db1.t2(a INT);
connection default;
UNLOCK TABLES;
connection con2;
# Reaping CREATE TABLE db1.t2(a INT)
connection default;
FLUSH TABLE WITH READ LOCK;
connection con2;
ALTER DATABASE db1 DEFAULT CHARACTER SET utf8;
connection default;
UNLOCK TABLES;
connection con2;
# Reaping ALTER DATABASE db1 DEFAULT CHARACTER SET utf8
connection default;
FLUSH TABLE WITH READ LOCK;
connection con2;
FLUSH TABLE WITH READ LOCK;
UNLOCK TABLES;
connection default;
UNLOCK TABLES;
DROP DATABASE db1;
disconnect con2;
disconnect con3;
#
# Bug#56292 Deadlock with ALTER TABLE and MERGE tables
#
DROP TABLE IF EXISTS t1, t2, m1;
CREATE TABLE t1(a INT) engine=MyISAM;
CREATE TABLE t2(a INT) engine=MyISAM;
CREATE TABLE m1(a INT) engine=MERGE UNION=(t1, t2);
INSERT INTO t1 VALUES (1), (2);
INSERT INTO t2 VALUES (3), (4);
connect con1, localhost, root;
connect con2, localhost, root;
connect con3, localhost, root;
connection con1;
# We need EXECUTE 2 since ALTER TABLE does SU => SNW => X and we want
# to stop at the second upgrade.
SET DEBUG_SYNC= 'mdl_upgrade_lock SIGNAL upgrade WAIT_FOR continue EXECUTE 2';
# Sending:
ALTER TABLE m1 engine=MERGE UNION=(t2, t1);
connection con2;
# Waiting for ALTER TABLE to try lock upgrade
SET DEBUG_SYNC= 'now WAIT_FOR upgrade';
SET DEBUG_SYNC= 'now SIGNAL continue';
SET DEBUG_SYNC= 'now WAIT_FOR upgrade';
# Sending:
DELETE FROM t2 WHERE a = 3;
connection con3;
# Check that DELETE is waiting on a metadata lock and not a table lock.
# Now that DELETE blocks on a metadata lock, we should be able to do
# SELECT * FROM m1 here. SELECT used to be blocked by a DELETE table
# lock request.
SELECT * FROM m1 WHERE a < 3;
connection default;
# Resuming ALTER TABLE
SET DEBUG_SYNC= 'now SIGNAL continue';
connection con1;
# Reaping: ALTER TABLE m1 engine=MERGE UNION=(t2, t1)
connection con2;
# Reaping: DELETE FROM t2 WHERE a = 3
connection con3;
# Reaping: SELECT * FROM m1 WHERE a < 3
a
1
2
connection default;
DROP TABLE m1, t1, t2;
SET DEBUG_SYNC= 'RESET';
disconnect con1;
disconnect con2;
disconnect con3;
#
# MDEV-12620 - set lock_wait_timeout = 1;flush tables with read lock;
# lock not released after timeout
#
CREATE TABLE t1(a INT) ENGINE=InnoDB;
SET debug_sync='open_tables_after_open_and_process_table SIGNAL ready WAIT_FOR go';
INSERT INTO t1 values (1);
connect con1,localhost,root,,;
SET debug_sync='now WAIT_FOR ready';
SET lock_wait_timeout=1;
FLUSH TABLES WITH READ LOCK;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
SET debug_sync='now SIGNAL go';
connection default;
# After MDEV-5536, SELECT will not block FLUSH TABLES
SET debug_sync='RESET';
SET debug_sync='open_tables_after_open_and_process_table SIGNAL ready WAIT_FOR go';
SELECT * FROM t1;
connection con1;
SET debug_sync='now WAIT_FOR ready';
SET lock_wait_timeout=1;
FLUSH TABLES WITH READ LOCK;
SET debug_sync='now SIGNAL go';
connection default;
a
1
connection con1;
unlock tables;
connection default;
SET debug_sync='RESET';
DROP TABLE t1;
disconnect con1;
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