Zhijie Shen updated YARN-3041:
    Attachment: YARN-3041.3.patch

Make a new patch:

1. Address some comments above.
2. Make annotations that are used by jackson marshal/unmarshal.
3. Add a test case to print json output.

One important change that I've made is the relationship to other entities. 
Instead of using the entity object, I use the identifier instead. This is 
because I want to avoid nested marshal of related/chid entities of the current 

> [Data Model] 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: Zhijie Shen
>         Attachments: Data_model_proposal_v2.pdf, YARN-3041.2.patch, 
> YARN-3041.3.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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