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From "Ankush Malhotra (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (JCR-3738) CLONE - Deadlock on LOCAL_REVISION table in clustering environment
Date Fri, 28 Feb 2014 15:24:20 GMT

     [ https://issues.apache.org/jira/browse/JCR-3738?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ankush Malhotra updated JCR-3738:
---------------------------------

    Attachment: stat-cache.log

> 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: 2.4.3
>         Environment: CQ5.6.1 with jackrabbit-core 2.6.2 backed off ibm db2 v10.5
>            Reporter: Ankush Malhotra
>            Assignee: Bart van der Schans
>            Priority: Critical
>             Fix For: 2.5.3
>
>         Attachments: db-deadlock-info.txt, stat-cache.log, threaddumps.zip
>
>
> 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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