gu-chi commented on YARN-3536:

Thx, as the exception trace stack is almost, I once looked into this ticket. 
This patch is already merged into the current environment I use.
Not same cause.

> ZK exception occur when updating AppAttempt status, then NPE thrown when RM 
> do recover
> --------------------------------------------------------------------------------------
>                 Key: YARN-3536
>                 URL: https://issues.apache.org/jira/browse/YARN-3536
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler, resourcemanager
>    Affects Versions: 2.4.1
>            Reporter: gu-chi
> Here is a scenario that Application status is FAILED/FINISHED but AppAttempt 
> status is null, this cause NPE when doing recover with 
> yarn.resourcemanager.work-preserving-recovery.enabled set to true, RM should 
> handle recovery gracefully

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