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From "Kannan Rajah (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (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 Thu, 04 Dec 2014 02:40:15 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3902?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kannan Rajah reassigned MAPREDUCE-3902:
---------------------------------------

    Assignee: Kannan Rajah  (was: Siddharth Seth)

> 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: Kannan Rajah
>         Attachments: AMContainerRefactorNotes.pdf, AM_ContainerRefactor.pdf, MAPREDUCE-3902.2.patch,
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)  : MAPREDUCE-4525 



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