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https://issues.apache.org/jira/browse/YARN-1013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16524225#comment-16524225
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Wangda Tan commented on YARN-1013:
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Thanks [~haibochen] for explanations,

bq. we are trying to just handle G resource requests with their enforcement 
flag set to false
This is the part I don't quite understand, where is the enforcement flag? Is it 
per app, per request or globally? 

bq. but the fair scheduler implementation (YARN-1015) tries to take into 
account of queue weight ...
Does this considers resource usages for O container or it is just consider G 
container usages?

> CS should watch resource utilization of containers and allocate speculative 
> containers if appropriate
> -----------------------------------------------------------------------------------------------------
>
>                 Key: YARN-1013
>                 URL: https://issues.apache.org/jira/browse/YARN-1013
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Arun C Murthy
>            Assignee: Weiwei Yang
>            Priority: Major
>
> CS should watch resource utilization of containers (provided by NM in 
> heartbeat) and allocate speculative containers (at lower OS priority) if 
> appropriate.



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