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https://issues.apache.org/jira/browse/HBASE-7868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13580582#comment-13580582
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Jean-Marc Spaggiari commented on HBASE-7868:
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[~lhofhansl] Lars, I'm running in standalone mode for those tests, so I don't
think the network is really impacting the restuls. Also, HBase is stopped
between each iteration, so cache is not really helping one iteration versus
another one. And last, I'm deleting zll ZooKeeper and HBase data between each
iteration too. I have attached an updated report with more results. I'm
currently running each test 10 times and taking the 80th percentil, but I can
increase that and run each test 20 or 50 times if that helps. I'm now running
randomSeekScan. Results will come over the day.
> 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,
> 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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