Jian He commented on YARN-4032:

Hi [~kasha], YARN-4347 may have fixed this inconsistent issue that may cause RM 
to crash with NPE.

> Corrupted state from a previous version can still cause RM to fail with NPE 
> due to same reasons as YARN-2834
> ------------------------------------------------------------------------------------------------------------
>                 Key: YARN-4032
>                 URL: https://issues.apache.org/jira/browse/YARN-4032
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.7.1
>            Reporter: Anubhav Dhoot
>            Assignee: Jian He
>            Priority: Critical
>         Attachments: YARN-4032.prelim.patch
> YARN-2834 ensures in 2.6.0 there will not be any inconsistent state. But if 
> someone is upgrading from a previous version, the state can still be 
> inconsistent and then RM will still fail with NPE after upgrade to 2.6.0.

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