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https://issues.apache.org/jira/browse/YARN-2928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14310285#comment-14310285
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Sangjin Lee commented on YARN-2928:
-----------------------------------

bq. When you say user, what does it really imply? User "a" can submit a hive 
query. A tez application running as user "hive" can execute the query submitted 
by user "a" using a's delegation tokens. With proxy users and potential use of 
delegation tokens, which "user" should be used?

That's something we haven't fully considered. IMO the user is used for resource 
attribution (e.g. chargeback) and also for access control. We'll need to sort 
out this scenario (probably not for the first cut however).

bq. What are the main differences between meta-data and configuration?

One could argue they are not different. However, from a user's perspective 
(especially MR jobs), the configuration has a strong meaning. It might be good 
to call out configuration separately from other metadata.

> 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
>            Priority: Critical
>         Attachments: ATSv2.rev1.pdf, ATSv2.rev2.pdf, Data model proposal 
> v1.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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