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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:
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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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