Varun Saxena commented on YARN-5561:

A small nit again in javadoc. Sorry for nitpicking.
"Return a set of containers belongs to given application attempt id" should be 
"Return a set of container entities belonging to given application attempt id"

Other than that +1 from my side too.

> [Atsv2] : Support for ability to retrieve apps/app-attempt/containers and 
> entities via REST
> -------------------------------------------------------------------------------------------
>                 Key: YARN-5561
>                 URL: https://issues.apache.org/jira/browse/YARN-5561
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelinereader
>            Reporter: Rohith Sharma K S
>            Assignee: Rohith Sharma K S
>         Attachments: 0001-YARN-5561.YARN-5355.patch, YARN-5561.02.patch, 
> YARN-5561.03.patch, YARN-5561.04.patch, YARN-5561.patch, YARN-5561.v0.patch
> ATSv2 model lacks retrieval of {{list-of-all-apps}}, 
> {{list-of-all-app-attempts}} and {{list-of-all-containers-per-attempt}} via 
> REST API's. And also it is required to know about all the entities in an 
> applications.
> It is pretty much highly required these URLs for Web  UI.
> New REST URL would be 
> # GET {{/ws/v2/timeline/apps}}
> # GET {{/ws/v2/timeline/apps/\{app-id\}/appattempts}}.
> # GET 
> {{/ws/v2/timeline/apps/\{app-id\}/appattempts/\{attempt-id\}/containers}}
> # GET {{/ws/v2/timeline/apps/\{app id\}/entities}} should display list of 
> entities that can be queried.  

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