Varun Vasudev updated YARN-4344:
    Attachment: YARN-4344.002.patch

Thanks for the feedback everyone. I've uploaded a new patch to use the 
SchedulerNode in the capacity scheduler and the fifo scheduler(which also has 
the same issue). I've also fixed the test to not use sleeps.

> NMs reconnecting with changed capabilities can lead to wrong cluster resource 
> calculations
> ------------------------------------------------------------------------------------------
>                 Key: YARN-4344
>                 URL: https://issues.apache.org/jira/browse/YARN-4344
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.7.1, 2.6.2
>            Reporter: Varun Vasudev
>            Assignee: Varun Vasudev
>            Priority: Critical
>         Attachments: YARN-4344.001.patch, YARN-4344.002.patch
> After YARN-3802, if an NM re-connects to the RM with changed capabilities, 
> there can arise situations where the overall cluster resource calculation for 
> the cluster will be incorrect leading to inconsistencies in scheduling.

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