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https://issues.apache.org/jira/browse/MAPREDUCE-2124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12926485#action_12926485
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Scott Chen commented on MAPREDUCE-2124:
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Hey Chris: Thanks for the reply. I think some users should be interested in
seeing how much time the reducer actually spending on the reduce phase (some
advanced users maybe). And the cost for doing this is low. I feel it is a good
thing to have.
> Add job counters for measuring time spent in three different phases in
> reducers
> -------------------------------------------------------------------------------
>
> Key: MAPREDUCE-2124
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2124
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: jobtracker
> Affects Versions: 0.22.0
> Reporter: Scott Chen
> Assignee: Scott Chen
> Priority: Minor
> Fix For: 0.22.0
>
> Attachments: MAPREDUCE-2124-v2.txt, MAPREDUCE-2124.txt
>
>
> We currently have SLOTS_MILLIS_REDUCES which measures the total slot time of
> reducer.
> It will be useful if we have
> {code}
> SLOTS_MILLIS_REDUCES_COPY
> SLOTS_MILLIS_REDUCES_SORT
> SLOTS_MILLIS_REDUCES_REDUCE
> {code}
> which measures three different phases of a reducer.
> This will help us identify the bottleneck of the reducers.
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