Vinod Kumar Vavilapalli commented on YARN-3047:

Tx for the doc.

Re Multiple options to determine whether an app is active: NMs informing the 
readers is backwards to me, though it is proactive. We can just have readers 
talk to RM. We can further optimize the calls by letting the readers 
asynchronously talk to RM to maintain an in-memory cache of a limited number of 
applications that finished say in the last one hour - this should work given 
the locality of queries w.r.t time.

> [Data Serving] Set up ATS reader with basic request serving structure and 
> lifecycle
> -----------------------------------------------------------------------------------
>                 Key: YARN-3047
>                 URL: https://issues.apache.org/jira/browse/YARN-3047
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Sangjin Lee
>            Assignee: Varun Saxena
>         Attachments: Timeline_Reader(draft).pdf, YARN-3047.001.patch, 
> YARN-3047.003.patch, YARN-3047.02.patch, YARN-3047.04.patch
> Per design in YARN-2938, set up the ATS reader as a service and implement the 
> basic structure as a service. It includes lifecycle management, request 
> serving, and so on.

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