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Posted to issues@hbase.apache.org by "Andrew Purtell (JIRA)" <ji...@apache.org> on 2013/04/24 18:21:16 UTC

[jira] [Commented] (HBASE-8418) Caching KeyValue.getRowLength() to improve scan performance

    [ https://issues.apache.org/jira/browse/HBASE-8418?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13640599#comment-13640599 ] 

Andrew Purtell commented on HBASE-8418:
---------------------------------------

+1, patch seems reasonable. What does the top ~5 look like before and after? Just curious.
                
> Caching KeyValue.getRowLength() to improve scan performance
> -----------------------------------------------------------
>
>                 Key: HBASE-8418
>                 URL: https://issues.apache.org/jira/browse/HBASE-8418
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Matteo Bertozzi
>            Assignee: Matteo Bertozzi
>            Priority: Minor
>         Attachments: HBASE-8418-0.94-v0.patch
>
>
> Looking at the profile seems that Bytes.toShort() is called a lot.
> the calls are in ScanQueryMatcher.match() and KeyValue.KeyComparator.compare()
> getKeyLength() is already cached, but getRowLength() is not.

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