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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15222) Use HDR histograms rather than hadoop or yammer's
Date Fri, 05 Feb 2016 21:51:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15135084#comment-15135084
] 

Elliott Clark commented on HBASE-15222:
---------------------------------------

Initial results:

{code}
Benchmark                             Mode  Cnt       Score   Error  Units
HistogramBenchmark.testHDRAtomic      avgt    2    1117.988          ns/op
HistogramBenchmark.testHDRConcurrent  avgt    2    2330.014          ns/op
HistogramBenchmark.testNormal         avgt    2    6085.187          ns/op
HistogramBenchmark.testQuant          avgt    2  397337.211          ns/op
{code}

So HDR is much faster. I'm going to re-run the test on server hardware with more cores than
my laptop. I'm also going to run it for longer.

> Use HDR histograms rather than hadoop or yammer's
> -------------------------------------------------
>
>                 Key: HBASE-15222
>                 URL: https://issues.apache.org/jira/browse/HBASE-15222
>             Project: HBase
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 2.0.0, 1.2.0, 1.3.0
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>             Fix For: 2.0.0, 1.3.0
>
>
> Running the benchmarks now, but it looks like the results are pretty extreme. The locking
in our histograms is pretty extreme.



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