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From "Marcel Reutegger (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-1872) Improve performance of simple path queries
Date Fri, 21 Nov 2008 12:48:44 GMT

    [ https://issues.apache.org/jira/browse/JCR-1872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649662#action_12649662
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Marcel Reutegger commented on JCR-1872:
---------------------------------------

I used the following test setup:

- create a tree structure with a depth of 6, each node having 10 child nodes. this results
in a workspace with about 1 million nodes
- each node has 10 properties with a randomly chosen value from a set of 1000 value. distribution
of the values is not uniform. some values are much more frequent than others.
- execute random queries that include the path to a leaf node and a jcr:contains clause with
a randomly chosen value from the set.

The test showed that the current implementation is heavily CPU bound. Each query takes about
340 milliseconds mostly doing the above mentioned hierarchy joins.

> Improve performance of simple path queries
> ------------------------------------------
>
>                 Key: JCR-1872
>                 URL: https://issues.apache.org/jira/browse/JCR-1872
>             Project: Jackrabbit
>          Issue Type: Improvement
>          Components: jackrabbit-core
>            Reporter: Marcel Reutegger
>            Priority: Minor
>
> Queries with simple path constraints can be quite slow because of the way they are implemented.
The current implementation basically does a hierarchical join with the context nodes and the
set of nodes with the name of the next location step. When the specified path is quite selective
the implementation should   rather resolve the path expression using the item state manager
(similar to how regular paths are resolved in the JCR API).

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