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https://issues.apache.org/jira/browse/HADOOP-4749?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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he yongqiang updated HADOOP-4749:
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Attachment: Task.patch
ReduceTask.patch
Added a new counter REDUCE_INPUT_BYTES in Task class
Currently the counter is only updated when the mapper is not local.
Is there a need to update the counter if the mapper is local?
> 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
> Reporter: Zheng Shao
> Attachments: ReduceTask.patch, Task.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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