Rohith Sharma K S created YARN-5561:
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             Summary: [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: Bug
          Components: timelinereader
            Reporter: Rohith Sharma K S
            Assignee: Rohith Sharma K S


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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