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Record BACKUP and SCHEMA namespaces order

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This commit is contained in:
Sergey Vojtovich
2019-06-06 14:41:45 +04:00
parent 965db355e6
commit 6999da9b19
2 changed files with 63 additions and 0 deletions
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25
mysql-test/main/backup_lock_debug.result
View File

@ -26,3 +26,28 @@ disconnect con1;
connection default; connection default;
DROP TABLE t1; DROP TABLE t1;
SET DEBUG_SYNC= 'RESET'; SET DEBUG_SYNC= 'RESET';
#
# Demonstrates a deadlock if BACKUP namespace is reorder after SCHEMA.
# Culprit is ALTER TABLE taking SCHEMA lock on target database after
# BACKUP lock was acquired.
#
CREATE DATABASE test2;
CREATE TABLE t1(a INT) ENGINE=InnoDB;
SET DEBUG_SYNC='alter_opened_table SIGNAL ready WAIT_FOR go';
ALTER TABLE t1 RENAME TO test2.t1;
connect con1,localhost,root,,;
SET DEBUG_SYNC='now WAIT_FOR ready';
BACKUP STAGE START;
SET DEBUG_SYNC='mdl_acquire_lock_wait SIGNAL ready1';
BACKUP STAGE BLOCK_DDL;
connect con2,localhost,root,,;
SET DEBUG_SYNC='now WAIT_FOR ready1';
SET DEBUG_SYNC='mdl_acquire_lock_wait SIGNAL go';
DROP DATABASE test2;
connection default;
connection con1;
disconnect con1;
connection con2;
disconnect con2;
connection default;
SET DEBUG_SYNC='reset';

38
mysql-test/main/backup_lock_debug.test
View File

@ -3,6 +3,7 @@
######################################################################## ########################################################################
--source include/have_debug_sync.inc --source include/have_debug_sync.inc
--source include/have_innodb.inc
--echo # --echo #
--echo # Make sure pending LOCK TABLES doesn't block BACKUP STAGE --echo # Make sure pending LOCK TABLES doesn't block BACKUP STAGE
@ -38,3 +39,40 @@ disconnect con1;
connection default; connection default;
DROP TABLE t1; DROP TABLE t1;
SET DEBUG_SYNC= 'RESET'; SET DEBUG_SYNC= 'RESET';
--echo #
--echo # Demonstrates a deadlock if BACKUP namespace is reorder after SCHEMA.
--echo # Culprit is ALTER TABLE taking SCHEMA lock on target database after
--echo # BACKUP lock was acquired.
--echo #
CREATE DATABASE test2;
CREATE TABLE t1(a INT) ENGINE=InnoDB;
SET DEBUG_SYNC='alter_opened_table SIGNAL ready WAIT_FOR go';
send ALTER TABLE t1 RENAME TO test2.t1;
connect (con1,localhost,root,,);
SET DEBUG_SYNC='now WAIT_FOR ready';
BACKUP STAGE START;
SET DEBUG_SYNC='mdl_acquire_lock_wait SIGNAL ready1';
send BACKUP STAGE BLOCK_DDL;
connect (con2,localhost,root,,);
SET DEBUG_SYNC='now WAIT_FOR ready1';
SET DEBUG_SYNC='mdl_acquire_lock_wait SIGNAL go';
send DROP DATABASE test2;
connection default;
reap;
connection con1;
reap;
disconnect con1;
connection con2;
reap;
disconnect con2;
connection default;
SET DEBUG_SYNC='reset';