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Date: Sun, 17 Feb 2013 10:39:13 +0000 (UTC)
From: "Matteo Bertozzi (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12632745.1361097345161.299080.1361097553267@arcas>
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Subject: [jira] [Updated] (HBASE-7868) HFile performance regression 92/94
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     [ https://issues.apache.org/jira/browse/HBASE-7868?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matteo Bertozzi updated HBASE-7868:
-----------------------------------

    Attachment: hfileperf-graphs.png

attached a graph extracted from HFilePerformanceEvaluation. Aside from strange runs the average seems to say that 92 is still faster than 94 and 94 with metrics commented out from HFileReaderV2, is way faster then 94
                
> 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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