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https://issues.apache.org/jira/browse/YARN-3041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14326183#comment-14326183
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Joep Rottinghuis commented on YARN-3041:
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Some additional throughs:
If we have the types strongly typed, do we need to call containers 
"YARN_CONTAINER" and "YARN_FLOW", or would we be able to capture more generic 
flows and containers with this as well ?
Perhaps the framework used to run could be a property for the generic entity.

I don't see what the advantage is to have the user set up the proper 
relationship. Why not make that part of the constructors and have protected 
methods to set up the hierarchy correctly ? Why introduce a chance to have this 
all set up strange ?

I think the acceptable entity types for parent-child relationships can be setup 
in the enum itself. The enums would simply have methods on them and can take 
constructors.

> [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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