Sangjin Lee commented on YARN-3041:

Hitesh on YARN-2928 brought up an interesting point regarding the events (also 
see my reply).

For my own education, what is an event in current ATS? Is it explicitly about 
affecting state changes in entities? Or can it be something else?

How should events be defined in the next gen timeline service? And/or should 
the notion of the "state" be explicitly defined? Thoughts?

> create the ATS entity/event API
> -------------------------------
>                 Key: YARN-3041
>                 URL: https://issues.apache.org/jira/browse/YARN-3041
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Sangjin Lee
>            Assignee: Robert Kanter
>         Attachments: YARN-3041.preliminary.001.patch
> Per design in YARN-2928, create the ATS entity and events API.
> Also, as part of this JIRA, create YARN system entities (e.g. cluster, user, 
> flow, flow run, YARN app, ...).

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