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From "Kang Xiao (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3902) MR AM should reuse containers for map tasks, there-by allowing fine-grained control on num-maps for users without need for CombineFileInputFormat etc.
Date Wed, 29 Feb 2012 01:56:19 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13218825#comment-13218825
] 

Kang Xiao commented on MAPREDUCE-3902:
--------------------------------------

Container resuse will also be useful to scale RM since it reduce the scheduling load of RM.
                
> MR AM should reuse containers for map tasks, there-by allowing fine-grained control on
num-maps for users without need for CombineFileInputFormat etc.
> ------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3902
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3902
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: applicationmaster, mrv2
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>         Attachments: MAPREDUCE-3902.patch
>
>
> The MR AM is now in a great position to reuse containers across (map) tasks. This is
something similar to JVM re-use we had in 0.20.x, but in a significantly better manner:
> # Consider data-locality when re-using containers
> # Consider the new shuffle - ensure that reduces fetch output of the whole container
at once (i.e. all maps) 

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