Rohith Sharma K S commented on YARN-5561:

During weekly sync up, we had discussion regarding for providing new REST URL 
i.e */ws/v2/applicationhistory*. One of the point discussed is what is the 
advantage is having separate REST end points which returns is *Report format? 
It will become a another version existing data with different format. But ATSv2 
TimelineEntity is super set of all where in user might required information 
which are not in *Report. So, if required information are published under first 
class entity info level like YARN-5699 doing, then it is more than sufficient. 

The consensus are
# we publish the yarn entities important information at first class  entity 
info level so that user can make use of these information to query using 
# We will be going ahead with adding new REST end points(patch already attached 
i.e YARN-5561.03.patch) which are enhancement of existing getEntities. 

> [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.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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