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From "Christian Stocker (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JCR-2968) Add an option to read the Clustering Journal from a different source than the rest of the clustering info
Date Tue, 10 May 2011 10:02:03 GMT
Add an option to read the Clustering Journal from a different source than the rest of the clustering
info
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                 Key: JCR-2968
                 URL: https://issues.apache.org/jira/browse/JCR-2968
             Project: Jackrabbit Content Repository
          Issue Type: New Feature
          Components: clustering, jackrabbit-core
            Reporter: Christian Stocker
         Attachments: 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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