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From "Bart van der Schans (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (JCR-2968) Add an option to read the Clustering Journal from a different source than the rest of the clustering info
Date Mon, 07 Nov 2011 11:05:51 GMT

    [ https://issues.apache.org/jira/browse/JCR-2968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13145339#comment-13145339
] 

Bart van der Schans commented on JCR-2968:
------------------------------------------

Hi,

I would like to create a branch for this as the changes will span several commits. Would that
be ok? Any special things to watch out for while creating a branch?

Bart
                
> Add an option to read the Clustering Journal from a different source than the rest of
the clustering info
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: JCR-2968
>                 URL: https://issues.apache.org/jira/browse/JCR-2968
>             Project: Jackrabbit Content Repository
>          Issue Type: New Feature
>          Components: clustering, jackrabbit-core
>    Affects Versions: 2.2.9
>            Reporter: Christian Stocker
>            Assignee: Jukka Zitting
>              Labels: patch
>         Attachments: 0001-JCR-2968-Add-an-option-to-read-the-Clustering-Journa.patch,
database-slave-local-revision-on-file.diff, patch_commit_2eed44310e71.patch
>
>
> This patch adds the possibility to read (but not write) the Cluster JOURNAL from a different
source than the rest of the cluster information. This makes it possible to setup a master/slave
DB setup, where everything cluster related is read from the slave, but writes to the master.
It reads the actual data also from the slave and assumes that this jackrabbit instance never
does any writes (except for updating the cluster index position in the DB). We have to read
the Cluster Journal from the slave to guarantee a consistent state
> More info why and how is here
> http://blog.liip.ch/archive/2011/05/04/how-to-make-jackrabbit-globally-distributable-fail-safe-and-scalable-in-one-go.html
> I didn't write any tests yet, if you can point me, where I should add them, I'll gladly
do them.
> Would be great, if we could integrate that in any of the future Jackrabbit releases.
> It's of course fully backwards compatible, nothing changes, if you don't sepcify 
>  <param name="dataSourceNameJournalRead">
> in repository.xml

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