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https://issues.apache.org/jira/browse/YARN-1365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14027189#comment-14027189
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Jian He commented on YARN-1365:
-------------------------------

Doing resync also for unregister is to keep the semantics that application 
should not be allowed to unregister if it did not registered before. 
[~bikassaha], [~vinodkv], [~rohithsharma], [~ozawa] Do we agree on doing this ?

> ApplicationMasterService to allow Register and Unregister of an app that was 
> running before restart
> ---------------------------------------------------------------------------------------------------
>
>                 Key: YARN-1365
>                 URL: https://issues.apache.org/jira/browse/YARN-1365
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Bikas Saha
>            Assignee: Anubhav Dhoot
>         Attachments: YARN-1365.001.patch, YARN-1365.002.patch, 
> YARN-1365.003.patch, YARN-1365.004.patch, YARN-1365.initial.patch
>
>
> For an application that was running before restart, the 
> ApplicationMasterService currently throws an exception when the app tries to 
> make the initial register or final unregister call. These should succeed and 
> the RMApp state machine should transition to completed like normal. 
> Unregistration should succeed for an app that the RM considers complete since 
> the RM may have died after saving completion in the store but before 
> notifying the AM that the AM is free to exit.



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