Bikas Saha updated YARN-394:
    Assignee:     (was: Bikas Saha)

> RM should be able to return requests that it cannot fulfill
> -----------------------------------------------------------
>                 Key: YARN-394
>                 URL: https://issues.apache.org/jira/browse/YARN-394
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Bikas Saha
> Currently, the RM has no way of returning requests that cannot be met. e.g. 
> if the app wants a specific node and that node dies, then the RM should 
> return that request instead of holding onto to it indefinitely. 
> Some situations in which this would be useful are:
> * After YARN-392, requests are location specific, and the locations that were 
> requested are no longer in the cluster.
> * A high memory machine is lost, and resource requests above certain sizes 
> are no longer able to be satisfied anywhere.
> * All nodes in the cluster become unavailable.
> At these points, there is no way the RM can inform the apps about its 
> inability to allocate requests.

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