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From "Kathey Marsden (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5552) Derby threads hanging when using ClientXADataSource and a deadlock or lock timeout occurs
Date Tue, 03 Jan 2012 17:50:39 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13178857#comment-13178857
] 

Kathey Marsden commented on DERBY-5552:
---------------------------------------

I'll work on a test case for this issue and run the patch through regression tests.  I wouldn't
 think a lock timeout wouldn't be a transaction level error but a deadlock would be.

	if (se.getSeverity() == ExceptionSeverity.TRANSACTION_SEVERITY) {

				synchronized (this) {
					// disable use of the connection until it is cleaned up.
					conn.setApplicationConnection(null);


It makes sense that the connection is needed to retrieve the error message text, but clearly
someone at some point thought it was important not to let anything happen on this connection
until the transaction was cleaned up.  It would be good to understand the scenarios for which
this this code was introduced.



                
> Derby threads hanging when using ClientXADataSource and a deadlock or lock timeout occurs
> -----------------------------------------------------------------------------------------
>
>                 Key: DERBY-5552
>                 URL: https://issues.apache.org/jira/browse/DERBY-5552
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Server
>    Affects Versions: 10.8.1.2
>         Environment: Solaris 10, Glassfish V2.1.1,
>            Reporter: Brett Bergquist
>            Priority: Blocker
>         Attachments: DERBY-5552-p1.patch, DERBY-5552-p2.patch, appserverstack.txt, client.tar.Z,
derby.log, derbystackatshutdown.txt, execute.patch, transactionsleft.txt
>
>
> The issue arrives when multiple XA transactions are done in parallel and there is either
a lock timeout or a lock deadlock detected.  When this happens the connection is leaked in
the Glassfish connection pool and the client thread hangs in "org.apache.derby.client.netReply.fill(Reply.java:172)".
 
> Shutting down the app server fails because the thread has a lock in "org.apache.derby.client.net.NetConnection40"
and another task is calling "org.apache.derby.client.ClientPooledConnection.close(ClientPooledConnection.java:214)"
which is waiting for the lock.
> Killing the appsever using "kill" and then attempting to shutdown Derby network server
causes the Network Server to hang.  One of the threads hangs waiting for a lock at "org.apache.derby.impl.drda.NeworkServerControlImpl.removeFromSessionTable(NetworkServerControlImpl.java:1525)"
and the "main" thread has this locked at "org.apache.derby.impl.drda.NetworkServerControlImpl.executeWork(NetworkServerControlImpl.java:2242)"
and it itself is waiting for a lock which belongs to a thread that is stuck at "org.apache.derby.impl.services.locks.ActiveLock.waitForGrant(ActiveLock.java:118)
which is in the TIMED_WAITING state.
> Only by killing the Network Server using "kill" is possible at this point.
> There are transactions left even though all clients have been removed.  

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