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https://issues.apache.org/jira/browse/JCR-1872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marcel Reutegger updated JCR-1872:
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Attachment: image001.png
The diagram shows query timings (microsecond, logarithmic scale). From top to
bottom:
- previous implementation (CPU bound, average 340 milliseconds)
- with recent changes, average time is now 20 milliseconds (the limiting factor
now is disc latency because of the random node lookup)
- with recent changes but in addition the derby database is now on a flash
disk, average time is now below 10 milliseconds
> 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
> Fix For: 1.6.0
>
> Attachments: image001.png
>
>
> 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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