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BUG#40827 - Killing insert-select to MyISAM can cause table corruption

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Killing insert-select statement on MyISAM corrupts the table.
                  
Killing the insert-select statement corrupts the MyISAM table only
when the destination table is empty and when it has indexes. When 
we bulk insert huge data and if the destination table is empty we 
disable the indexes for fast inserts, data is then inserted and 
indexes are re-enabled after bulk_insert operation
                  
Killing the query, aborts the repair table operation during enable
indexes phase leading to table corruption.
                
We now truncate the table when we detect that enable indexes is
killed for bulk insert query.As we have an empty table before the 
operation, we can fix by truncating the table.
This commit is contained in:
Satya B
2009-04-16 17:02:56 +05:30
parent fc35ded3f4
commit f6c28cd948
3 changed files with 140 additions and 4 deletions
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52
mysql-test/t/myisam.test
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@ -1478,5 +1478,57 @@ let $MYSQLD_DATADIR= `select @@datadir`;
--exec $MYISAMCHK -d $MYSQLD_DATADIR/test/t1
DROP TABLE t1;
--echo #
--echo # BUG#40827 - Killing insert-select to MyISAM can cause table corruption
--echo #
CONNECT (insertConn, localhost, root,,);
CREATE TABLE `t1` (
`id` BIGINT(20) ,
`id1` BIGINT(20) AUTO_INCREMENT,
KEY(id1), KEY(id)
) ENGINE=MyISAM;
CREATE TABLE `t2` (
`id` BIGINT(20) ,
`id1` BIGINT(20) AUTO_INCREMENT,
KEY (id1), KEY(id)
) ENGINE=MyISAM;
INSERT INTO t2 (id) VALUES (123);
let $i = 10;
while ($i)
{
INSERT INTO t2 (id) SELECT id FROM t2;
dec $i;
}
--echo # Switch to insert Connection
CONNECTION insertConn;
SET SESSION debug='+d,wait_in_enable_indexes';
--echo # Send insert data
SEND INSERT INTO t1(id) SELECT id FROM t2;
--echo # Switch to default Connection
CONNECTION default;
--echo # Wait for insert data to reach the debug point
let $wait_condition=
SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.PROCESSLIST
WHERE STATE = "wait_in_enable_indexes" AND
INFO = "INSERT INTO t1(id) SELECT id FROM t2";
--source include/wait_condition.inc
SELECT ID FROM INFORMATION_SCHEMA.PROCESSLIST
WHERE STATE = 'wait_in_enable_indexes' AND
INFO = "INSERT INTO t1(id) SELECT id FROM t2"
INTO @thread_id;
KILL QUERY @thread_id;
CHECK TABLE t1;
DROP TABLE t1,t2;
DISCONNECT insertConn;
--echo End of 5.1 tests