Bikas Saha created YARN-394:
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             Summary: 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. Currently, since every request can be met at * locality such a situation is hard to repro. It can however happen that all nodes in a cluster become unavailable. At that point, there is no way the RM can inform the apps about its inability to allocate requests.

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