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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HBASE-7868) HFile performance regression between 0.92 and 0.94
Date Mon, 18 Feb 2013 02:33:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13580373#comment-13580373
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Lars Hofhansl edited comment on HBASE-7868 at 2/18/13 2:31 AM:
---------------------------------------------------------------

Hmmm... Interesting. So with each point release 0.94 has become slower? With the biggest drop
in 0.94.4?
This is not what my testing bore out (and we also had our Phoenix team test the releases).

Are you 100% you did not invert the axis?

                
      was (Author: lhofhansl):
    Hmmm... Interesting. So with each point release 0.94 has become slower? With the biggest
drop in 0.94.4?
This is not what my testing bore out (and we also the our Phoenix team test the releases).

Are you 100% you did not invert the axis?

                  
> 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: 0.94.6
>
>         Attachments: FilteredScan.png, hfileperf-graphs.png
>
>
> 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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