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Posted to issues@hbase.apache.org by "Matteo Bertozzi (JIRA)" <ji...@apache.org> on 2013/03/02 20:23:12 UTC

[jira] [Commented] (HBASE-7868) HFile performance regression between 0.92 and 0.94

    [ https://issues.apache.org/jira/browse/HBASE-7868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13591485#comment-13591485 ] 

Matteo Bertozzi commented on HBASE-7868:
----------------------------------------

[~jmspaggi] Take a look at UniformRandomSmallScan you start with 4000ms and you keep increasing each release to 4330ms.
                
> HFile performance regression between 0.92 and 0.94
> --------------------------------------------------
>
>                 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
>             Fix For: 0.94.7
>
>         Attachments: FilteredScan.png, hfileperf-graphs.png, HFilePerformanceEvaluation.txt, performances.pdf, performances.pdf
>
>
> By HFilePerformanceEvaluation seems that 0.94 is slower then 0.92
> Looking at the profiler for the Scan path, 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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