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From "Erik Krogen (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HADOOP-13747) Use LongAdder for more efficient metrics tracking
Date Fri, 21 Oct 2016 17:40:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15595799#comment-15595799
] 

Erik Krogen edited comment on HADOOP-13747 at 10/21/16 5:40 PM:
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See linked HDFS-10872 for benchmark results indicating appropriate directions for implementation.
Also note just for clarity that not all metric types use a {{synchronized}} block, only {{MutableRate}}/{{MutableStats}}/{{MutableQuantiles}}.



was (Author: xkrogen):
See linked HDFS-10872 for benchmark results indicating appropriate directions for implementation.

> 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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