[
https://issues.apache.org/jira/browse/DERBY-5564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13179916#comment-13179916
]
Knut Anders Hatlen commented on DERBY-5564:
-------------------------------------------
Applications typically check the SQLState, not the message id. To get the
message id, they'd first need to unwrap the SQLException to get the underlying
StandardException, and StandardException is not part of the public API. So I
don't think it would affect existing applications. Except, as Brett mentioned,
if the applications check for SQLState 40XL2 without also checking for 40XL1.
We should probably mention that in the release notes.
> Code does different things depending if derby.locks.deadlockTrace=true is set
> -----------------------------------------------------------------------------
>
> Key: DERBY-5564
> URL: https://issues.apache.org/jira/browse/DERBY-5564
> Project: Derby
> Issue Type: Bug
> Components: Network Client, Network Server
> Affects Versions: 10.8.2.2
> Environment: Solaris 10
> Glassfish V2.1.1
> Reporter: Brett Bergquist
> Assignee: Mike Matrigali
> Attachments: DERBY-5564.patch
>
>
> I see a problem in the code handling lock timeout exceptions. In the code in
> various places there are calls such as:
> // 2 kinds of errors here expected here. Either container not
> // found or could not obtain lock (LOCK_TIMEOUT or DEADLOCK).
> //
> // It is possible by the time this post commit work gets
> scheduled
> // that the container has been dropped and that the open
> container
> // call will return null - in this case just return assuming no
> // work to be done.
> if
> (se.getMessageId().equals(SQLState.LOCK_TIMEOUT) ||
>
> se.getMessageId().equals(SQLState.DEADLOCK))
> Or
> // First try to do the work in the nested transaction. Fail if we
> can't
> // get a lock immediately.
> if ( nestedTransaction != null )
> {
> try {
> return updateCurrentValueOnDisk( nestedTransaction, oldValue,
> newValue, false );
> }
> catch (StandardException se)
> {
> if ( !se.getMessageId().equals( SQLState.LOCK_TIMEOUT ) ) {
> throw se; }
> }
> Or
> // exception might have occured either container got dropper or
> lock not granted.
> // It is possible by the time this post commit work gets
> scheduled
> // that the container has been dropped and that the open
> container
> // call will return null - in this case just return assuming no
> // work to be done.
> //If this expcetion is
> because lock could not be obtained , work is requeued.
> if
> (se.getMessageId().equals(SQLState.LOCK_TIMEOUT) ||
>
> se.getMessageId().equals(SQLState.DEADLOCK))
> {
> requeue_work
> = true;
> }
> The problem that I see is that if the property
> "derby.locks.deadlockTrace=true" is set, then instead of a
> SQLState.LOCK_TIMEOUT, the code will see a SQLState.LOCK_TIMEOUT_LOG. Note
> that this is not being checked for in the above tests and others as well, so
> now the code behavior is going to change basd on whether the lock tracing is
> enabled or not.
> I think that 99% of the code that is testing for SQLState.LOCK_TIMEOUT should
> also be checking for SQLState.LOCK_TIMEOUT_LOG as well. I only see one
> place in DDLConstantAction where it is explicitly mentioned that
> SQLState.LOCK_TIMEOUT_LOG is not being looked at.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
