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https://issues.apache.org/jira/browse/HBASE-7868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13618311#comment-13618311
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Jean-Marc Spaggiari commented on HBASE-7868:
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I still have on my ToDo to build more granular tests to figure where the
performances are impacted between 0.92 and 0.94, but I'm lacking some free time
to complete that :(
Based on Matteo's tests, it seems to be metrics related. Were the metrics there
in 0.92?
BTW, I'm fine to remove this JIRA from 0.94 until we have a plan for it.
> 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: FilteredScan.png, hfileperf-graphs.png,
> HFilePerformanceEvaluation.txt, performances.pdf, performances.pdf
>
>
> 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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