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https://issues.apache.org/jira/browse/MAPREDUCE-2124?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Scott Chen updated MAPREDUCE-2124:
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Attachment: MAPREDUCE-2124.txt
> 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.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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