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From "Unico Hommes (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JCR-3263) Consistency checker performance improvements
Date Sat, 17 Mar 2012 08:31:44 GMT
Consistency checker performance improvements
--------------------------------------------

                 Key: JCR-3263
                 URL: https://issues.apache.org/jira/browse/JCR-3263
             Project: Jackrabbit Content Repository
          Issue Type: Improvement
            Reporter: Unico Hommes


Currently the consistency checker loads in a batch of node ids and for each node id fetches
the corresponding bundle, its child bundles, and parent bundle separately. This makes the
consistency checker perform less than optimal and may take hours (days?) to complete for large
repositories.

I've been able to make the checker execute about 20 times faster on my local machine by loading
in batches of node prop bundles at once. For 17000 nodes in the workspace the current implementation
ran for about 23 seconds whereas with the enhancements I made it finished in 1.2 seconds.

Now the problem lies in the fact that loading in node prop bundles in batches may require
a lot of memory. And it is not very predictable how much per batch size because the sizes
of the individual bundles are unpredictable.

Also the node prop bundle contains much more information than is needed for a consistency
check.

What would be ideal in this situation is to introduce a new type - call it NodeInfo - that
contains only the structural information the checker needs to do its work. Meaning the node
id, the parent id and the child ids. In order to allow for a possible future referential integrity
check perhaps also its reference type propeties.

The IterablePersistenceManager interface would then get an additional method:
Map<NodeId, NodeInfo> getAllNodeInfos();

If this is an acceptable proposal I would like to work on this and contribute a patch.


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