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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15222) Use less contended classes for metrics
Date Fri, 19 Feb 2016 19:35:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15154728#comment-15154728
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Elliott Clark commented on HBASE-15222:
---------------------------------------

New quick run benchmarks for histograms:

{code}
Benchmark                               Mode       Cnt      Score       Error  Units
HistogramBenchmark.fastLong           sample  26830008    412.311 ±     6.117  ns/op
HistogramBenchmark.testHDRAtomic      sample  32395382    702.467 ±     8.176  ns/op
HistogramBenchmark.testHDRConcurrent  sample  28700135    761.574 ±     7.146  ns/op
HistogramBenchmark.testNormal         sample  25185388   1579.276 ±    12.280  ns/op
HistogramBenchmark.testQuant          sample  26280320  41405.881 ± 15370.385  ns/op
HistogramBenchmark.testYammer         sample  41691930   1705.323 ±    10.818  ns/op
{code}

So it doesn't look like we need to have a new dependency.

> Use less contended classes for metrics
> --------------------------------------
>
>                 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
>            Priority: Critical
>             Fix For: 2.0.0, 1.3.0
>
>         Attachments: HBASE-15222-v1.patch, HBASE-15222-v2.patch, HBASE-15222-v3.patch,
HBASE-15222-v5.patch, HBASE-15222.patch
>
>
> 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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