Andrew Wang created HADOOP-13615:
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Summary: 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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