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From "Luca Tagliani (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (JCR-3440) Deadlock on LOCAL_REVISION table in clustering environment
Date Fri, 12 Oct 2012 07:35:03 GMT

    [ https://issues.apache.org/jira/browse/JCR-3440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13474866#comment-13474866
] 

Luca Tagliani commented on JCR-3440:
------------------------------------

Hi Bart,

>To me the check "stopRevision != startRevision" looks unnecessary. If there are no records
to consume then the stopRevision will still be at Long.MIN_VALUE.
Yes, you're right. My mistake :-)

>syncAgainOnNewRecords() functionality only seems to be only available in the 2.4 branch.
Yes, the patch code I submitted is in fact relative to the 2.4.3 tag source code, because
it's the version in use in the production environment.

Before developing the patch code, I tried to use the latest 2.5.2 release (even if it is stated
as "not production ready") to see if it resolves my problem, but it didn't do, so I patch
the version currently we use in production.

Should I provide a patch against trunk?

BR

Luca
                
> 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: JCR-3440.patch
>
>
> 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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