Bikas Saha commented on YARN-2047:

I think the general idea is that the AM cannot be trusted about allocated 
resources or running containers.

> RM should honor NM heartbeat expiry after RM restart
> ----------------------------------------------------
>                 Key: YARN-2047
>                 URL: https://issues.apache.org/jira/browse/YARN-2047
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Bikas Saha
> After the RM restarts, it forgets about existing NM's (and their potentially 
> decommissioned status too). After restart, the RM cannot maintain the 
> contract to the AM's that a lost NM's containers will be marked finished 
> within the expiry time.

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