Hitesh Shah commented on YARN-2928:

bq. In this use case, who is the user of the TEZ application? This may affect 
the data mode and the parent-child relationship (cluster->user->flow->flow 
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? 

bq. "metadata" aims to store the same thing as "otherInfo", ... 
Seems like a good option. What form of search will be supported? In most cases, 
values will unlikely be primitive types but deep nested structures. Will you 
support all forms of search on all objects? 

bq. They sound to be interesting features, ..
My point related to events was not about a new interesting feature but to 
generally understand what use case is meant to be solved by events and how 
should an application developer use events? 

bq. We may probably run adhoc query to get the events of all applications of a 
How is a workflow defined when an entity has 2 parents? Considering the 
tez-hive example, do you agree that both a Hive Query and a Tez application are 
workflows and share some entities? 


> 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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