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Posted to issues@hbase.apache.org by "Ted Yu (JIRA)" <ji...@apache.org> on 2013/02/17 16:47:12 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=13580199#comment-13580199 ]
Ted Yu commented on HBASE-7868:
-------------------------------
For sequential write, average performance 0.94 without metrics is a bit slower compared to that of 0.92
> 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
> 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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