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https://issues.apache.org/jira/browse/JCR-2968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15468081#comment-15468081
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Woonsan Ko commented on JCR-2968:
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If I may, I'd like an optional configuration element of "InstanceRevision"
element inside "Journal" element because "Journal" object has an
"InstanceRevision" object and so it's reflecting the relationship better, IMHO.
> 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
> 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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