Jian He commented on YARN-2209:

bq. there could be possibly loosing HeartbeatThread if again 
"responseQueue.add(response);" InterruptedException. Can it be in while loop?
I see. added the while loop back.
bq. can add Note to AM_SHUTDOWN that providing link to 
add description too.

> Replace allocate#resync command with ApplicationMasterNotRegisteredException 
> to indicate AM to re-register on RM restart
> ------------------------------------------------------------------------------------------------------------------------
>                 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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