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From "Joel Richard (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OAK-3154) Improve SimpleNodeAggregator performance with a NodeState cache
Date Tue, 28 Jul 2015 16:05:07 GMT
Joel Richard created OAK-3154:
---------------------------------

             Summary: Improve SimpleNodeAggregator performance with a NodeState cache
                 Key: OAK-3154
                 URL: https://issues.apache.org/jira/browse/OAK-3154
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: query
    Affects Versions: 1.3.3
            Reporter: Joel Richard


I have profiled a query where 16% of the query fetching time is spent inside of SimpleNodeAggregator.isNodeType.
In my case, a lot of nodes which are read have overlapping paths.

Because the nodes seem to be iterated alphabetically, it would be possible to cache the previous
NodeState chain in an array and reuse as much as possible if the previous and current path
overlap. This would significantly reduce the query fetching time in cases where a lot of paths
are similar. Since the NodeState cache array can be reused for the whole query execution,
the possible overhead of it should be negligible.



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