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Posted to common-issues@hadoop.apache.org by "Zhe Zhang (JIRA)" <ji...@apache.org> on 2016/10/21 17:32:59 UTC

[jira] [Created] (HADOOP-13747) Use LongAdder for more efficient metrics tracking

Zhe Zhang created HADOOP-13747:
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             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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