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From "Dag H. Wanvik (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 22:44:40 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13179094#comment-13179094
] 

Dag H. Wanvik commented on DERBY-5552:
--------------------------------------

What about getApplicationState which reads applicationConnection? For example, it seems this
is called unsynchronized, e.g from EmbedResultSet#movePosition -> checkExecIfClosed ->
getEmbedConnection().getApplicationConnection(). If applicationConnection is no nulled, could
that break the logic in checkExecIfClosed? There are other cases of calls to getApplicationState
which I didn't look at yet.

                
> 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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