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https://issues.apache.org/jira/browse/HBASE-7868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13580195#comment-13580195
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Ted Yu commented on HBASE-7868:
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Looking at the graph, 0.94 without metrics was slower than stock 0.94 in over
50% of the samples.
> 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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