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From "he yongqiang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4749) reducer should output input data size when shuffling is done
Date Sat, 06 Dec 2008 05:33:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4749?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

he yongqiang updated HADOOP-4749:

    Attachment: Task.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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