Rohith updated YARN-1366:

    Attachment: YARN-1366.1.patch

I updated the patch for follwing changes in AMRMClient(MapReduce is not 
considered here)
1. On Resync from RM, reset lastResponseId and re register with RM.
2. Add back ResourceRequest for last allocate request.
3. Followed by 1 and 2, AMRMClient continue heatbeat

Patch does not contain test, and I will write test in next patches.

Please review initiall patch ,does this satisfy task expectations. 

Work Item to be decided.
1. On resync, last ResourceRequest are added back to ask send back again 
Here my doubt is, what about old asks which are sent earlier heartbeat but not 
allocated? Earlier requests can be populated using remoteRequestTable.
2. For MapReduce changes, should be handled in this jira?

Current behaviour of AMs treats RESYNC and SHUTDOWN as same.It would be very 
useful if resync and shutdown commands are issued separately by application 
master service. 

> 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.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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