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https://issues.apache.org/jira/browse/YARN-1003?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13726101#comment-13726101
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Vinod Kumar Vavilapalli commented on YARN-1003:
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I guess you are referring to restricting the number of tasks per node *per
job*. If so, the implementation was always a hack in MR1. It was first wrongly
put outside the scheduler, and then pushed into FairScheduler as devs behind FS
wanted the feature atleast in FS as there was no correct way to do it in
MR1/JT.
The correct way to do this now with YARN is to implement it inside the AM.
That's what users always wanted really, to restrict this job to run say only
one task per node.
> Add a maxContainersPerNode config to the Fair Scheduler
> -------------------------------------------------------
>
> Key: YARN-1003
> URL: https://issues.apache.org/jira/browse/YARN-1003
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: scheduler
> Affects Versions: 2.1.0-beta
> Reporter: Sandy Ryza
> Assignee: Karthik Kambatla
>
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