Zhijie Shen commented on YARN-2928:

Sangjin. Some quick thought about the second point. Currently, ATS 
work-preserving restart only involves recovery of the token information in 
secured scenario only thanks to the almost stateless nature (YARN-2837). In the 
following, depending on how the writer is implemented, we may want to preserve 
the outstanding timeline data that is received by ATS companion but is still 
not be persisted into the storage backend. IAC, it seem to be the common 
requirement no matter it's per-node (e.g., restarting) or per-app (e.g., 

> Application Timeline Server (ATS) next gen: phase 1
> ---------------------------------------------------
>                 Key: YARN-2928
>                 URL: https://issues.apache.org/jira/browse/YARN-2928
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: timelineserver
>            Reporter: Sangjin Lee
>            Assignee: Sangjin Lee
>            Priority: Critical
>         Attachments: ATSv2.rev1.pdf, ATSv2.rev2.pdf
> We have the application timeline server implemented in yarn per YARN-1530 and 
> YARN-321. Although it is a great feature, we have recognized several critical 
> issues and features that need to be addressed.
> This JIRA proposes the design and implementation changes to address those. 
> This is phase 1 of this effort.

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