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https://issues.apache.org/jira/browse/YARN-1366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14003678#comment-14003678
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Bikas Saha commented on YARN-1366:
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bq.If there's no RM restart, a normal app only calling unregister without 
calling register earlier will be just deemed as FINISHED ? is this acceptable?
bq.What about storing information on zk for registered application.
Catching incorrect unregistration before registration should have always been 
there. Is this a regression in the patch or an existing bug. Should we consider 
the possibility of allowing unregister without register? What are the 
downsides? As long as we can make sure that unregister is coming from the 
latest version of the app.

> ApplicationMasterService should Resync with the AM upon allocate call after 
> restart
> -----------------------------------------------------------------------------------
>
>                 Key: YARN-1366
>                 URL: https://issues.apache.org/jira/browse/YARN-1366
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Bikas Saha
>            Assignee: Rohith
>         Attachments: YARN-1366.1.patch, YARN-1366.2.patch, YARN-1366.patch, 
> YARN-1366.prototype.patch, YARN-1366.prototype.patch
>
>
> The ApplicationMasterService currently sends a resync response to which the 
> AM responds by shutting down. The AM behavior is expected to change to 
> calling resyncing with the RM. Resync means resetting the allocate RPC 
> sequence number to 0 and the AM should send its entire outstanding request to 
> the RM. Note that if the AM is making its first allocate call to the RM then 
> things should proceed like normal without needing a resync. The RM will 
> return all containers that have completed since the RM last synced with the 
> AM. Some container completions may be reported more than once.



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