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From "Jukka Zitting (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-2660) Hierarchical map-reduce
Date Thu, 17 Jun 2010 11:49:23 GMT
Hierarchical map-reduce

                 Key: JCR-2660
                 URL: https://issues.apache.org/jira/browse/JCR-2660
             Project: Jackrabbit Content Repository
          Issue Type: New Feature
          Components: jackrabbit-core
            Reporter: Jukka Zitting
             Fix For: 2.2.0

As discussed on a few occasions earlier, it would be great to have a feature that allows efficient
and automatic processing of information over entire subtrees of content. Such a feature could
be used to maintain custom reports, search indexes, and other summary information for selected

The map-reduce paradigm works great for such a purpose, as you can combine a per-node map
operation with a reduce operation that combines the map results of the children of a given
parent node. It's easy to generalize this model to cover entire subtrees. And if the reduced
information is stored as a part of each parent node, it's even possible to incrementally update
the results for an entire subtree when just a part of the subtree is modified.

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