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From "he yongqiang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4749) reducer should output input data size when shuffling is done
Date Fri, 12 Dec 2008 10:05:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12655946#action_12655946
] 

he yongqiang commented on HADOOP-4749:
--------------------------------------

hi, Arun
    Thank you.




Best regards,
 
Yongqiang He
2008-12-12

Email: heyongqiang@software.ict.ac.cn
Tel:   86-10-62600966(O)
 
Research Center for Grid and Service Computing,
Institute of Computing Technology, 
Chinese Academy of Sciences
P.O.Box 2704, 100080, Beijing, China 



发件人: Arun C Murthy (JIRA)
发送时间: 2008-12-12 17:10:57
收件人: heyongqiang@software.ict.ac.cn
抄送: 
主题: [jira] Assigned: (HADOOP-4749) reducer should output input datasize when shuffling
is done


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

Arun C Murthy reassigned HADOOP-4749:
-------------------------------------

    Assignee: he yongqiang


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> 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
>            Assignee: he yongqiang
>             Fix For: 0.20.0
>
>         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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