Carlo Curino resolved YARN-2475.
          Resolution: Fixed
    Target Version/s: 3.0.0
        Hadoop Flags: Reviewed

I committed this to YARN-1051 branch. Thanks to [~chris.douglas] for the 

> ReservationSystem: replan upon capacity reduction
> -------------------------------------------------
>                 Key: YARN-2475
>                 URL: https://issues.apache.org/jira/browse/YARN-2475
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Carlo Curino
>            Assignee: Carlo Curino
>         Attachments: YARN-2475.patch, YARN-2475.patch, YARN-2475.patch
> In the context of YARN-1051, if capacity of the cluster drops significantly 
> upon machine failures we need to trigger a reorganization of the planned 
> reservations. As reservations are "absolute" it is possible that they will 
> not all fit, and some need to be rejected a-posteriori.  

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