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From "Brett Bergquist (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5560) Java deadlock between LogicalConnection40 and ClientXAConnection40
Date Fri, 20 Jul 2012 12:24:33 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419080#comment-13419080
] 

Brett Bergquist commented on DERBY-5560:
----------------------------------------

I still am not able to help provide tests, but this is an important fix as it does occur in
production.  I have been running with this patched in place at a large telecom running under
Glassfish and have not seen this issue since the patch was put in place.

In upgrading to 10.9.1.0, I have had to reapplied this patch and provide a custom build.
                
> Java deadlock between LogicalConnection40 and ClientXAConnection40
> ------------------------------------------------------------------
>
>                 Key: DERBY-5560
>                 URL: https://issues.apache.org/jira/browse/DERBY-5560
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Client
>    Affects Versions: 10.8.2.2
>         Environment: Solaris 10
> Glassfish V2.1.1 
> ClientXADataSource connection pool setup to close all connections on any error
>            Reporter: Brett Bergquist
>              Labels: derby_triage10_9
>         Attachments: DERBY-5560.patch
>
>
> There is a Java deadlock between LogicalConnection40 and ClientXAConnection40.  The order
of calls that cause the deadlock are:
> Thread 1
> ----
> LogicalConnection.close
> ClientPooledConnection.recycleConnection
> Thread 2
> ----
> ClientPooledConnection.close
> LogicalConnection.nullPhysicalConnection
> Thread 1 acquires a lock on the LogicalConnection and attempts to acquire a lock on the
ClientPooledConnection
> Thread 2 acquires a lock on the ClientPooledConnection and attempts to acquire a lock
on the LogicalConnection
> In production this occurs when one thread is committing a transaction and another thread
is trying to close the connection.  This occurred because the Glassfish connection pool is
setup to close all connections on any error on any connection and an error has been detected
on another connection in the pool.

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