Jian He commented on YARN-2613:

bq. I think it is better to keep consistent to use int or long
good catch, I  changed the one for RMProxy, but missed this. 
bq. Do we have plan to get HADOOP-9576 in? If yes, shall we keep the todo 
comments here?
I forgot my initial intent to add this comment. As now I followed 
FailoverOnNetworkExceptionRetry for the exception-retry policy, I found maybe 
we don't need to do this for now.

> 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
> 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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