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From "Jean-Marc Spaggiari (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-7868) HFile performance regression between 0.92 and 0.94
Date Mon, 18 Feb 2013 01:10:11 GMT

     [ https://issues.apache.org/jira/browse/HBASE-7868?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jean-Marc Spaggiari updated HBASE-7868:
---------------------------------------

    Attachment: FilteredScan.png

Attached is the FilteredScan test restuls from PerformanceTest. There is only 0.94.x for now
but 0.92.x is coming soon. As you can see, there is also some perfs impacts between 0.94.0
and 0.94.5 (about 1%).
                
> 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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