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https://issues.apache.org/jira/browse/HADOOP-4845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12656189#action_12656189
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Zheng Shao commented on HADOOP-4845:
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{quote}
The local variable bytesTransferred in ReduceCopier.fetchOutputs record the
same as reduceInputBytes. the only difference is that the reduceInputBytes is
class member and bytesTransferred is only method-scope, I guess what Arun C
Murthy said is to remove the bytesTransferred variable.
{quote}
@Yongqiang: Yep i agree we just need one variable as you did in the first
version. Last time I thought that fetchOutputs() will be called multiple times,
but apparently it's not. Please merge the 2 variables.
> 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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