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https://issues.apache.org/jira/browse/MAPREDUCE-3902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13435807#comment-13435807
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Tsuyoshi OZAWA commented on MAPREDUCE-3902:
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@Siddharth,
I have two questions, although my work is still in progress.
# If I create some patches(ex. fixing TODOs or something), should I send pull
request against your github or attach patch here?
# Do you think that it's needed to separate hadoop-mapreduce-client-app from
hadoop-mapreduce-client-app2? Your prototype is under
hadoop-mapreduce-client-app2 currently. This make it difficult to rebase your
code on trunk.
> 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: Siddharth Seth
> Attachments: 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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