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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7868) HFile performance regression between 0.92 and 0.94
Date Sun, 17 Feb 2013 23:59:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13580333#comment-13580333
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Andrew Purtell commented on HBASE-7868:
---------------------------------------

Thought this issue might be a dup of HBASE-6852 too.

As for per-CF metrics, we need something like this for things like HBASE-4147 and HBASE-6572,
but perhaps more lazy and/or approximate and/or out of line than current.
                
> 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: 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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