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https://issues.apache.org/jira/browse/HADOOP-13615?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Wang resolved HADOOP-13615.
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Resolution: Duplicate
> Convert uses of AtomicLong for counter metrics to LongAdder
> -----------------------------------------------------------
>
> Key: HADOOP-13615
> URL: https://issues.apache.org/jira/browse/HADOOP-13615
> Project: Hadoop Common
> Issue Type: Improvement
> Components: metrics
> Affects Versions: 3.0.0-alpha1
> Reporter: Andrew Wang
>
> LongAdder (available in JDK8) can provide much better performance than
> AtomicLong since it uses thread locals under the hood.
> We should consider switching over our uses of AtomicLong and friends over to
> LongAdder.
> If we want to target for JDK7, we can also pull in the implementation since
> it's pure Java (public domain):
> http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/jsr166e/LongAdder.java?view=co
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