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Bug #43867 ALTER TABLE on a partitioned table causes unnecessary

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deadlocks

Backport of revno: 2617.68.35

The problem was that if one connection is running a multi-statement 
transaction which involves a single partitioned table, and another 
connection attempts to alter the table to drop a non-existing partition,
(which of course will fail), the first connection still gets 
ER_LOCK_DEADLOCK and cannot proceed anymore.

This bug is no longer reproducable. This has also been tested with the
patch for Bug#46654 "False deadlock on concurrent DML/DDL with partitions, 
inconsistent behavior" which concerned a similar problem but where the 
ALTER TABLE is semantically correct.

Test case added in partition_sync.test.
This commit is contained in:
Jon Olav Hauglid
2009-11-04 12:59:46 +01:00
parent a5d74eb1b4
commit 17a6040fbc
2 changed files with 66 additions and 0 deletions
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25
mysql-test/r/partition_sync.result Normal file
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#
# Bug #43867 ALTER TABLE on a partitioned table
# causes unnecessary deadlocks
#
CREATE TABLE t1 (a int) PARTITION BY RANGE (a)
(PARTITION p0 VALUES LESS THAN (1),
PARTITION p1 VALUES LESS THAN (2));
INSERT INTO t1 VALUES (0),(1);
# Connection 2
BEGIN;
SELECT * FROM t1;
a
0
1
# Connection 1
ALTER TABLE t1 DROP PARTITION p3;
ERROR HY000: Error in list of partitions to DROP
# Connection 2
# This failed with deadlock and should not do so.
SELECT * FROM t1;
a
0
1
# Connection 1
DROP TABLE t1;

41
mysql-test/t/partition_sync.test Normal file
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--source include/have_partition.inc
# Save the initial number of concurrent sessions.
--source include/count_sessions.inc
--echo #
--echo # Bug #43867 ALTER TABLE on a partitioned table
--echo # causes unnecessary deadlocks
--echo #
CREATE TABLE t1 (a int) PARTITION BY RANGE (a)
(PARTITION p0 VALUES LESS THAN (1),
PARTITION p1 VALUES LESS THAN (2));
INSERT INTO t1 VALUES (0),(1);
connect(con1,localhost,root);
--echo # Connection 2
connection con1;
BEGIN;
SELECT * FROM t1;
--echo # Connection 1
connection default;
--error ER_DROP_PARTITION_NON_EXISTENT
ALTER TABLE t1 DROP PARTITION p3;
--echo # Connection 2
connection con1;
--echo # This failed with deadlock and should not do so.
SELECT * FROM t1;
--echo # Connection 1
connection default;
disconnect con1;
DROP TABLE t1;
# Check that all connections opened by test cases in this file are really
# gone so execution of other tests won't be affected by their presence.
--source include/wait_until_count_sessions.inc