Zhijie Shen commented on YARN-3041:

bq. I think the run id of a flow is an attribute of a flow, it need not be a 
separate class.

So what's the difference between flow and flow run? On page.5 of the design doc 
v2, it seems that flow run is the child of flow. [~sjlee0], would you please 

bq. Also, queue and user are timeline entities, I think if they may not require 
a class by themselves.

Do you mean they need to extend timeline entity? I think in the new patch, they 
do it in this way.

> [Data Model] create overall data objects of TS next gen
> -------------------------------------------------------
>                 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: Zhijie Shen
>         Attachments: Data_model_proposal_v2.pdf, YARN-3041.2.patch, 
> YARN-3041.3.patch, YARN-3041.4.patch, 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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