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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-3980) Conflicting select then update with REPEATABLE_READ gives lock timeout instead of deadlock
Date Mon, 15 Dec 2008 19:11:44 GMT

     [ https://issues.apache.org/jira/browse/DERBY-3980?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kathey Marsden updated DERBY-3980:
----------------------------------

    Attachment: LiveLockTest_diff.txt

Attached is a test that test for live lock.  I would appreciate it if someone could review
to make sure I am testing the right thing.  I have
SelectThread1 - starts right away.
for 10 tries {
  - select * from t;
   -wait 3 seconds
   - commit
}

SelectThread2 
Wait 1 second then the same as SelectThread1>
   
UpdateThread
Wait 2 seconds
UPDATE T SET I = 456 where I = 456

Deadlock timeout set to 5 seconds
Lock timeout set to 10 seconds.

Makes sure the update goes through without exception.


> 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: Store
>    Affects Versions: 10.1.3.1, 10.2.2.0, 10.3.3.0, 10.4.2.0, 10.5.0.0
>            Reporter: Kathey Marsden
>         Attachments: derby-3980_javadoc_and_test_diff.txt, derby.log, derby.log.10_1,
javacore.20081209.092827.9800.txt, LiveLockTest_diff.txt, TryTimeout.java, TryTimeout2.java,
TryTimeout2.out.10_1.deadlock, TryTimeout2.out.10_1.deadlock, TryTimeout2.out.10_1.locktimeout,
TryTimeout2.out.10_1.locktimeout
>
>
> 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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