Li Lu commented on YARN-4224:

Yes, I think this is fine for entities. The root cause of this is that entities 
need both id and type to be uniquely identified. For UID based queries we can 
pass type as a query parameter. For the hierarchical endpoints, type is modeled 
as a part of entity ids (we have to do this to uniquely id an entity). The 
clash will happen if we hit the .../apps endpoint, and we have to distinguish 
those two cases. 

> Change the ATSv2 reader side REST interface to conform to current REST APIs' 
> in YARN
> ------------------------------------------------------------------------------------
>                 Key: YARN-4224
>                 URL: https://issues.apache.org/jira/browse/YARN-4224
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: YARN-2928
>            Reporter: Varun Saxena
>            Assignee: Varun Saxena
>              Labels: yarn-2928-1st-milestone
>         Attachments: YARN-4224-YARN-2928.01.patch, 
> YARN-4224-feature-YARN-2928.wip.02.patch

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