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https://issues.apache.org/jira/browse/MAPREDUCE-3902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13437662#comment-13437662
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Tsuyoshi OZAWA commented on MAPREDUCE-3902:
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bq. I think a pull request against github for now, and for bigger / more
significant changes - a separate subtasks under this jira for the changes.
Okey.
bq. I'd like to create a separate branch for this jira, pull in the current set
of changes with some cleanup, and then continue development. Will create a
branch later this week unless if noone objects.
All right, I agree with the idea to create new branch for this jira. It's much
easier to trace the changes.
And, I sent pull request (at
github)[https://github.com/sidseth/h2-container-reuse/pull/1]. Please check it
out.
> 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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