Junping Du commented on YARN-2209:

bq. Previously, AM doesn't do re-register. Re-register on RM restart is a new 
requirement coming out from YARN-556.
Does RESYNC being added in YARN-556 also? If so, I think this is a reasonable 
change and I suggest to remove RESYNC completely (not just deprecated) before 
this feature get released. 

> Replace AM resync/shutdown command with corresponding exceptions
> ----------------------------------------------------------------
>                 Key: YARN-2209
>                 URL: https://issues.apache.org/jira/browse/YARN-2209
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Jian He
>            Assignee: Jian He
>         Attachments: YARN-2209.1.patch, YARN-2209.2.patch, YARN-2209.3.patch, 
> YARN-2209.4.patch, YARN-2209.5.patch
> YARN-1365 introduced an ApplicationMasterNotRegisteredException to indicate 
> application to re-register on RM restart. we should do the same for 
> AMS#allocate call also.

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