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https://issues.apache.org/jira/browse/DERBY-5552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13208434#comment-13208434
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Brett Bergquist commented on DERBY-5552:
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It would be great to have picked the mind of the author of the comment and code
but it appeared this was this way since the beginning. I don't think it would
hurt to do what you suggest but just to let you know, this code is not in
production being exercised extensively (private build with this in it as I had
a need to fix the problem now) with no issues found. Just some empirical
testing results.
Thanks for taking the time to look at it.
Brett
> 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
> Assignee: Kathey Marsden
> Priority: Blocker
> Attachments: DERBY-5552-p1.patch, DERBY-5552-p2.patch,
> ReproDerby5552LockTimeout.java, appserverstack.txt, client.tar.Z,
> derby-5552_withtest_diff.txt, derby-5552_withtest_diff.txt, 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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