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From "Jukka Zitting (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OAK-1934) Optimize MutableTree.orderBefore for the common case
Date Tue, 01 Jul 2014 15:35:24 GMT
Jukka Zitting created OAK-1934:
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             Summary: Optimize MutableTree.orderBefore for the common case
                 Key: OAK-1934
                 URL: https://issues.apache.org/jira/browse/OAK-1934
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: core
            Reporter: Jukka Zitting
            Assignee: Jukka Zitting


After OAK-850 and OAK-1584 we settled on an {{orderBefore()}} implementation that always recreates
the child order list based on the names of the child nodes that are present in a parent. This
is a somewhat expensive operation with lots of child nodes as seen in JCR-3793.

We could optimize the implementation further for the common case where the child order list
is in sync with the actual list of child nodes. For example we could skip recreating the child
order list when the name we're looking for is already included in that list. Over time this
approach should still detect cases where the list becomes out of sync, and automatically repair
the list when that happens.



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