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Posted to issues@hbase.apache.org by "Jean-Marc Spaggiari (JIRA)" <ji...@apache.org> on 2013/02/17 13:49:12 UTC

[jira] [Commented] (HBASE-7868) HFile performance regression 92/94

    [ https://issues.apache.org/jira/browse/HBASE-7868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13580180#comment-13580180 ] 

Jean-Marc Spaggiari commented on HBASE-7868:
--------------------------------------------

Hi Matteo,

Which 0.94.x version did you used for this test?

Thanks,

JM
                
> HFile performance regression 92/94
> ----------------------------------
>
>                 Key: HBASE-7868
>                 URL: https://issues.apache.org/jira/browse/HBASE-7868
>             Project: HBase
>          Issue Type: Bug
>          Components: io
>    Affects Versions: 0.94.5
>            Reporter: Matteo Bertozzi
>            Assignee: Matteo Bertozzi
>         Attachments: hfileperf-graphs.png
>
>
> By HFilePerformanceEvaluation seems that 0.94 is slower then 0.92
> Looking at the profiler seems that most of the time, compared to 92, is spent in the metrics dictionary lookup. [~eclark] pointed out the new per family/block metrics.
> By commenting the metrics call in HFileReaderV2, the performance seems to get better, but maybe metrics is not the only problem.

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