[
https://issues.apache.org/jira/browse/JCR-2000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12678306#action_12678306
]
Jukka Zitting commented on JCR-2000:
------------------------------------
As far as I can tell, the lockups are caused by the test case forcibly
terminating long-lived threads. The Thread.stop() call does unlock any object
monitors the thread has locked, but will leave the explicit lock objects locked.
The proposed change extends the scope of the versioning lock used in
transactions, and thus affects the performance of concurrent commits. This is
probably the cause of the timeouts of the test case being reached.
> 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
>
>
> 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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
