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https://issues.apache.org/jira/browse/HADOOP-4749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12654356#action_12654356
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Zheng Shao commented on HADOOP-4749:
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+1
I don't know if we have unit tests for all counters? If so we also need to add
this into the unit test. (Try run "ant test" in the trunk directory).
Otherwise we don't have to add a test I think.
> reducer should output input data size when shuffling is done
> ------------------------------------------------------------
>
> Key: HADOOP-4749
> URL: https://issues.apache.org/jira/browse/HADOOP-4749
> Project: Hadoop Core
> Issue Type: Improvement
> Components: mapred
> Affects Versions: 0.19.0
> Reporter: Zheng Shao
> Attachments: 4749.patch
>
>
> Sometimes we see a single slow reducer because of the load balancing problem.
> This information will be very useful to understand how imbalanced the load is.
> Should be easy to fix I guess, since reducer should have all information
> needed at the end of the shuffling phase.
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