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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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