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Date: Thu, 5 Mar 2009 10:39:56 -0800 (PST)
From: "Jukka Zitting (JIRA)" <jira@apache.org>
To: dev@jackrabbit.apache.org
Subject: [jira] Resolved: (JCR-2000) Deadlock on concurrent commits
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     [ https://issues.apache.org/jira/browse/JCR-2000?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jukka Zitting resolved JCR-2000.
--------------------------------

    Resolution: Fixed

Fixed the last issue as described in revision 750536. Merged the fix to the 1.5 branch in revision 750539.

Everything seems good again, but I'll schedule another test run over the night to catch any other regressions.

> Deadlock on concurrent commits
> ------------------------------
>
>                 Key: JCR-2000
>                 URL: https://issues.apache.org/jira/browse/JCR-2000
>             Project: Jackrabbit Content Repository
>          Issue Type: Bug
>          Components: jackrabbit-core, transactions
>    Affects Versions: 1.5.3
>            Reporter: Jukka Zitting
>            Assignee: Jukka Zitting
>             Fix For: 1.5.4
>
>         Attachments: JCR-2000.patch, JCR-2000.patch, search-on-sism.patch, thread-join.patch
>
>
> As reported in the followup to JCR-1979, there's a case where two transactions may be concurrently inside a commit. This is bad as it breaks the main assumption in http://jackrabbit.apache.org/concurrency-control.html about all transactions first acquiring the versioning write lock.
> Looking deeper into this I find that the versioning write lock is only acquired if the transaction being committed contains versioning operations. This is incorrect as all transactions in any case need to access the version store when checking for references.

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