Sangjin Lee commented on YARN-3041:

bq. I suggest using more generalized in/outbound relationship instead of 
parent-child one.

One parent can have multiple children obviously, but we said in the current 
design that we want to limit the parent to be one. The consideration was that 
the parent-child relationship is used really to handle the aggregation along 
the linear hierarchy, and multiple parents complicate that significantly.

> 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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