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https://issues.apache.org/jira/browse/HBASE-16146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15518004#comment-15518004
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Gary Helmling commented on HBASE-16146:
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In master, where we can rely on LongAdder, we've already replaced Counter with
that.
In branch-1, I'm not sure that using reflection to call through to LongAdder
when running on Java 8 is going to give us a more performant solution. And it
still won't help the situation when running on Java < 8. Besides, Counter
generally performs well, it just seems to degrade as more Counters are kept in
memory due to the ThreadLocal usage.
> Counters are expensive...
> -------------------------
>
> Key: HBASE-16146
> URL: https://issues.apache.org/jira/browse/HBASE-16146
> Project: HBase
> Issue Type: Sub-task
> Reporter: stack
> Attachments: HBASE-16146.branch-1.3.001.patch, counters.patch,
> less_and_less_counters.png
>
>
> Doing workloadc, perf shows 10%+ of CPU being spent on counter#add. If I
> disable some of the hot ones -- see patch -- I can get 10% more throughput
> (390k to 440k). Figure something better.
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