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Posted to dev@jackrabbit.apache.org by "Bart van der Schans (JIRA)" <ji...@apache.org> on 2012/11/05 13:20:13 UTC
[jira] [Commented] (JCR-3440) Deadlock on LOCAL_REVISION table in
clustering environment
[ https://issues.apache.org/jira/browse/JCR-3440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13490595#comment-13490595 ]
Bart van der Schans commented on JCR-3440:
------------------------------------------
Hi Luca,
I've committed a slightly different version which should have the same effect. Could you run your test again?
Regards,
Bart
> Deadlock on LOCAL_REVISION table in clustering environment
> ----------------------------------------------------------
>
> Key: JCR-3440
> URL: https://issues.apache.org/jira/browse/JCR-3440
> Project: Jackrabbit Content Repository
> Issue Type: Bug
> Components: clustering
> Affects Versions: 2.4.3
> Environment: Env.1: 4x Linux server CentOS 5 MSSQL 2008 database (production system)
> Env.2: 2x Linux Ubuntu 10.04 server tested with PostgreSQL 9.1, H2, MSSQL 2008 and mySQL 5.5 (lab system)
> Reporter: Luca Tagliani
> Priority: Critical
> Attachments: catalina.out, fixAlwaysBatchMode.patch, fixNoLockOnLocalRevisionsWIP.java, JCR-3440.patch, threadDump-JCR-3440.txt
>
>
> 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.
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