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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-13747) Use LongAdder for more efficient metrics tracking
Date Fri, 21 Oct 2016 17:32:59 GMT
Zhe Zhang created HADOOP-13747:

             Summary: Use LongAdder for more efficient metrics tracking
                 Key: HADOOP-13747
                 URL: https://issues.apache.org/jira/browse/HADOOP-13747
             Project: Hadoop Common
          Issue Type: Improvement
          Components: metrics
            Reporter: Zhe Zhang
            Assignee: Erik Krogen

Currently most metrics, including {{RpcMetrics}} and {{RpcDetailedMetrics}}, use a synchronized
counter to be updated by all handler threads (multiple hundreds in large production clusters).
As [~andrew.wang] suggested, it'd be more efficient to use the [LongAdder | http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/jsr166e/LongAdder.java?view=co]
library which dynamically create intermediate-result variables.

Assigning to [~xkrogen] who has already done some investigation on this.

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