Zhijie Shen updated YARN-3041:
    Attachment: YARN-3041.2.patch

Based on the online/offline discussion so far around the timeline data model, 
I've updated the proposal doc and attached it hear. Different from the first 

* we're going to treat Cluster, Flow, FlowRun, Application, ApplicationAttempt 
and Container as the first class citizen entities. There's parent-child 
relationship among them. FlowRun could be nested.

* In addition, we also define User and Queue to support the aggregation from 
these two aspects.

* Moreover, the metric will host either signal value or time series.

I created and attached a patch, which translates the data model into Java 
objects. It may still need to be adjusted according to JAXB requirement.

> [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.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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