Junping Du updated YARN-3039:
    Attachment: YARN-3039-no-test.patch

Just finish the first patch with core changes needed in option 2 (without any 
tests which will be added later), include:
- maintain the app aggregator info in RMApp
- aggregator update in NM-RM heartbeat
- aggregator update in AM-RM allocation request/response
- Persistent aggregator update in RMStateStore

> [Aggregator wireup] Implement ATS writer service discovery
> ----------------------------------------------------------
>                 Key: YARN-3039
>                 URL: https://issues.apache.org/jira/browse/YARN-3039
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Sangjin Lee
>            Assignee: Robert Kanter
>         Attachments: Service Binding for applicationaggregator of ATS 
> (draft).pdf, YARN-3039-no-test.patch
> Per design in YARN-2928, implement ATS writer service discovery. This is 
> essential for off-node clients to send writes to the right ATS writer. This 
> should also handle the case of AM failures.

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