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From "Robert Sauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-2554) Deadlock inside XASession on Weblogic
Date Wed, 10 Mar 2010 12:29:27 GMT

    [ https://issues.apache.org/jira/browse/JCR-2554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12843549#action_12843549
] 

Robert Sauer commented on JCR-2554:
-----------------------------------

The test driver is relatively simple as it just involves multiple threads reading from the
repository in parallel sessions. Downside is just that I'm currently using an in house developed
library on top of JCR which unfortuantely I cannot pass around.

Working on an isolated test driver that talks just plain JCR, though.


> Deadlock inside XASession on Weblogic
> -------------------------------------
>
>                 Key: JCR-2554
>                 URL: https://issues.apache.org/jira/browse/JCR-2554
>             Project: Jackrabbit Content Repository
>          Issue Type: Bug
>          Components: jackrabbit-core
>    Affects Versions: 1.6.1, 2.0.0
>         Environment: Weblogic 9.2
>            Reporter: Robert Sauer
>            Priority: Critical
>
> In one of our client deployments on WebLogic 9.2 we observed JackRabbit sessions going
stale in a load test. This was observed against release 1.6.1 (to which we migrated due to
concurrency related issues JCR-2081 and JCR-2237). Same effect with 2.0.0.
>  
> I could finally reproduce this issue locally. And it seems to boil down to WLS invoking
the sequence of <prepare> ... <release> ... <commit> on one XA session from
multiple threads, as it seems breaking assumptions of the thread-bound java.util.concurrent-RWLock
based DefaultISMLocking class.
> Effectively the setActiveXid(..) method on DefaultISMLocking$RWLock fails as the old
active XID was not yet cleared. With the result of more and more sessions deadlocking in below's
invocation stack.
> {code}
> "[ACTIVE] ExecuteThread: '27' for queue: 'weblogic.kernel.Default (self-tuning)'" daemon
prio=1 tid=0x33fc3ec0 nid=0x2324 in Object.wait() [0x2156a000..0x2156beb0] at java.lang.Object.wait(Native
Method) - waiting on <0x68a54698> (a EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock$WriterLock)
at java.lang.Object.wait(Object.java:474) at EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock$WriterLock.acquire(Unknown
Source) - locked <0x68a54698> (a EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock$WriterLock)
at org.apache.jackrabbit.core.state.DefaultISMLocking$1.<init>(DefaultISMLocking.java:64)
at org.apache.jackrabbit.core.state.DefaultISMLocking.acquireWriteLock(DefaultISMLocking.java:61)
at org.apache.jackrabbit.core.version.AbstractVersionManager.acquireWriteLock(AbstractVersionManager.java:146)
at org.apache.jackrabbit.core.version.XAVersionManager$1.prepare(XAVersionManager.java:562)
at org.apache.jackrabbit.core.TransactionContext.prepare(TransactionContext.java:154) - locked
<0x6dc2ad88> (a org.apache.jackrabbit.core.TransactionContext) at org.apache.jackrabbit.core.XASessionImpl.prepare(XASessionImpl.java:331)
at org.apache.jackrabbit.jca.TransactionBoundXAResource.prepare(TransactionBoundXAResource.java:68)
at weblogic.connector.security.layer.AdapterLayer.prepare(AdapterLayer.java:397) at weblogic.connector.transaction.outbound.XAWrapper.prepare(XAWrapper.java:297)
at weblogic.transaction.internal.XAServerResourceInfo.prepare(XAServerResourceInfo.java:1276)
at weblogic.transaction.internal.XAServerResourceInfo.prepare(XAServerResourceInfo.java:499)
at weblogic.transaction.internal.ServerSCInfo$1.execute(ServerSCInfo.java:335) at weblogic.kernel.Kernel.executeIfIdle(Kernel.java:243)
at weblogic.transaction.internal.ServerSCInfo.startPrepare(ServerSCInfo.java:326) at weblogic.transaction.internal.ServerTransactionImpl.localPrepare(ServerTransactionImpl.java:2516)
at weblogic.transaction.internal.ServerTransactionImpl.globalPrepare(ServerTransactionImpl.java:2211)
at weblogic.transaction.internal.ServerTransactionImpl.internalCommit(ServerTransactionImpl.java:266)
at weblogic.transaction.internal.ServerTransactionImpl.commit(ServerTransactionImpl.java:227)
at weblogic.transaction.internal.TransactionManagerImpl.commit(TransactionManagerImpl.java:283)
at org.springframework.transaction.jta.JtaTransactionManager.doCommit(JtaTransactionManager.java:1028)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:709)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:678)
> {code}

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