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https://issues.apache.org/jira/browse/JCR-3738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13933499#comment-13933499
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Ankush Malhotra commented on JCR-3738:
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It may be ok for a workaround but the server does seem to run into deadlock
pretty often (every 5 minutes or so), with db killing the hung up thread. On
the other hand its not so bad because jcr re-tries a failed operation, so there
is no loss of functionality or data for application.
> CLONE - Deadlock on LOCAL_REVISION table in clustering environment
> ------------------------------------------------------------------
>
> Key: JCR-3738
> URL: https://issues.apache.org/jira/browse/JCR-3738
> Project: Jackrabbit Content Repository
> Issue Type: Bug
> Components: clustering
> Affects Versions: 2.6.2
> Environment: CQ5.6.1 with jackrabbit-core 2.6.2 backed off ibm db2
> v10.5
> Reporter: Ankush Malhotra
> Priority: Critical
> Attachments: before-lock.zip, db-deadlock-info.txt, stat-cache.log,
> threaddumps.zip
>
>
> Original, cloned description:
> > When inserting a lot of nodes concurrently (100/200 threads) the system
> > hangs generating a deadlock on the LOCAL_REVISION table.
> > There is a thread that starts a transaction but the transaction remains
> > open, while another thread tries to acquire the lock on the table.
> > This actually happen even if there is only a server up but configured in
> > cluster mode.
> > I found that in AbstractJournal, we try to write the LOCAL_REVISION even if
> > we don't sync any record because they're generated by the same journal of
> > the thread running.
> >
> > Removing this unnecessary (to me :-) ) write to the LOCAL_REVISION table,
> > remove the deadlock.
> This might not be the exact same case with this issue. See the attached
> thread dumps etc. for full details.
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