[jira] Updated: (JCR-2660) Hierarchical map-reduce

["Jukka Zitting (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/JCR-2660?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jukka Zitting updated JCR-2660:
-------------------------------

    Fix Version/s:     (was: 2.2.0)

> 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
>
> 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 subtrees.
> 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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