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Posted to common-issues@hadoop.apache.org by "Erik Krogen (JIRA)" <ji...@apache.org> on 2016/10/21 17:40:58 UTC
[jira] [Comment Edited] (HADOOP-13747) Use LongAdder for more
efficient metrics tracking
[ 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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