Jian He updated YARN-2613:
    Attachment: YARN-2613.3.patch

Thanks Junping for reviewing the patch !
Addressed the comments.
Also tested with DistributedShell in a single node cluster. AM will retry NM in 
case NM is down.

> NMClient doesn't have retries for supporting rolling-upgrades
> -------------------------------------------------------------
>                 Key: YARN-2613
>                 URL: https://issues.apache.org/jira/browse/YARN-2613
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Jian He
>            Assignee: Jian He
>         Attachments: YARN-2613.1.patch, YARN-2613.2.patch, YARN-2613.3.patch
> While NM is rolling upgrade, client should retry NM until it comes up. This 
> jira is to add a NMProxy (similar to RMProxy) with retry implementation to 
> support rolling upgrade.

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