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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Closed: (DERBY-3980) Conflicting select then update with REPEATABLE_READ gives lock timeout instead of deadlock
Date Sat, 19 Mar 2011 00:26:29 GMT

     [ 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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