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Posted to derby-dev@db.apache.org by "Kathey Marsden (JIRA)" <ji...@apache.org> on 2011/03/19 01:26:29 UTC
[jira] Closed: (DERBY-3980) Conflicting select then update with
REPEATABLE_READ gives lock timeout instead of deadlock
[ https://issues.apache.org/jira/browse/DERBY-3980?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kathey Marsden closed DERBY-3980.
---------------------------------
Closing this issue. Thank you Knut for the great fix and figuring out the tricky deadlock code.
> Conflicting select then update with REPEATABLE_READ gives lock timeout instead of deadlock
> ------------------------------------------------------------------------------------------
>
> Key: DERBY-3980
> URL: https://issues.apache.org/jira/browse/DERBY-3980
> Project: Derby
> Issue Type: Bug
> Components: Services
> Affects Versions: 10.1.3.1, 10.2.2.0, 10.3.3.0, 10.4.2.0, 10.5.1.1
> Reporter: Kathey Marsden
> Assignee: Knut Anders Hatlen
> Labels: derby_triage10_5_2
> Fix For: 10.5.3.2, 10.6.2.3, 10.7.1.3, 10.8.0.0
>
> Attachments: LiveLockTest_diff.txt, LiveLockTest_with_Deadlock_look_diff.txt, LockTimeoutWithInserts.java, TryTimeout.java, TryTimeout2.java, TryTimeout2.out.10_1.deadlock, TryTimeout2.out.10_1.deadlock, TryTimeout2.out.10_1.locktimeout, TryTimeout2.out.10_1.locktimeout, derby-3980-1a.diff, derby-3980_javadoc_and_test_diff.txt, derby.log, derby.log.10_1, javacore.20081209.092827.9800.txt
>
>
> The attached program TryTimeout.java should detect a deadlock but instead throws a lock timeout exception. The program has two threads that attempt:
>
> threadConnection.setAutoCommit(false);
> /* set isolation level to repeatable read */
> threadConnection.setTransactionIsolation(Connection.TRANSACTION_REPEATABLE_READ);
>
> ResultSet rs = stmt.executeQuery("select * from t where i = 456");
> while (rs.next());
> stmt.executeUpdate("update t set i = 456 where i = 456");
> threadConnection.commit();
> This gives SQLState 40001 (deadlock) with DB2 but a lock timeout with Derby.
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