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https://issues.apache.org/jira/browse/MAPREDUCE-3902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214819#comment-13214819
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Jay Finger commented on MAPREDUCE-3902:
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I haven't read the patch, forgive me if the answer is already there.
Is there a cap on the amount of re-use? For example, if the container has been
in use for more than 1 minute then do not re-use it.
Or to rephrase, what prevents a cluster with a few large jobs from having
hogged containers?
> MR AM should reuse containers for map tasks
> -------------------------------------------
>
> 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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