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From "Marcel Reutegger (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-2000) Deadlock on concurrent commits
Date Wed, 04 Mar 2009 12:17:58 GMT

    [ https://issues.apache.org/jira/browse/JCR-2000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12678711#action_12678711
] 

Marcel Reutegger commented on JCR-2000:
---------------------------------------

> Why do we need the thread killing in the first place? A normal join() call with no timeout
should be fine enough

Right, that would work well when one runs the test on a local machine. I had some build infrastructure
in mind, where I want a report after the tests finished, which means termination must be guaranteed.



> 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, 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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