Steve Loughran commented on YARN-1105:

This can actually be done in the client, which lets you do other policies such 
as decide when to relax placement, rather than rely on the cluster scheduler. 

> RM or YarnClient to notify AMs if resource requests cannot be satisfied
> -----------------------------------------------------------------------
>                 Key: YARN-1105
>                 URL: https://issues.apache.org/jira/browse/YARN-1105
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: client, nodemanager
>    Affects Versions: 2.1.0-beta
>            Reporter: Steve Loughran
>            Priority: Minor
> Long-lived services may want to know when resource requests can't be 
> satisfied, when they are stuck in a queue -so that they can cancel them, 
> change the requirements or react in another applications-specific way

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