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https://issues.apache.org/jira/browse/MAPREDUCE-5394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13714723#comment-13714723
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张慕华 commented on MAPREDUCE-5394:
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this is a good idea.
> Job Counters - ability to perform calculations other than sum
> -------------------------------------------------------------
>
> Key: MAPREDUCE-5394
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5394
> Project: Hadoop Map/Reduce
> Issue Type: New Feature
> Affects Versions: 1.2.0, 2.1.0-beta
> Reporter: Sheetal Dolas
>
> Many a times the applications need to report values as more than sums across
> tasks. Such as min/max/avg of certain metric or metric grouped by nodes/racks.
> Having this kind of ability in counters will greatly enhance the utility of
> counters.
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