Chang Li updated YARN-4334:
    Attachment: YARN-4334.wip.2.patch

Thanks [~jlowe] for review! I have updated .2 prototype patch, please try it 
out. On rm state store expired, rm recovery will recover previous running app 
and app attempts to killed. .2 prototype patch also address your other 
concerns. Will work on implementation of other statestore soon.

> Ability to avoid ResourceManager recovery if state store is "too old"
> ---------------------------------------------------------------------
>                 Key: YARN-4334
>                 URL: https://issues.apache.org/jira/browse/YARN-4334
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>            Reporter: Jason Lowe
>            Assignee: Chang Li
>         Attachments: YARN-4334.wip.2.patch, YARN-4334.wip.patch
> There are times when a ResourceManager has been down long enough that 
> ApplicationMasters and potentially external client-side monitoring mechanisms 
> have given up completely.  If the ResourceManager starts back up and tries to 
> recover we can get into situations where the RM launches new application 
> attempts for the AMs that gave up, but then the client _also_ launches 
> another instance of the app because it assumed everything was dead.
> It would be nice if the RM could be optionally configured to avoid trying to 
> recover if the state store was "too old."  The RM would come up without any 
> applications recovered, but we would avoid a double-submission situation.

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