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https://issues.apache.org/jira/browse/HADOOP-4845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12655863#action_12655863
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he yongqiang commented on HADOOP-4845:
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@Arun C Murthy, yes, we can remove the variable bytesTransferred.
@Chris Douglas, by shuffled bytes, you mean the number of recourds mappers 
output to a specific reducer or to all reducers? 

> Shuffle counter issues
> ----------------------
>
>                 Key: HADOOP-4845
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4845
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.20.0
>            Reporter: Chris Douglas
>             Fix For: 0.20.0
>
>
> HADOOP-4749 added a new counter tracking the bytes shuffled into the reduce. 
> It adds an accumulator to ReduceCopier instead of simply incrementing the new 
> counter and did not define a human-readable value in 
> src/mapred/org/apache/hadoop/mapred/Task_Counter.properties.

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