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https://issues.apache.org/jira/browse/YARN-5561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15446353#comment-15446353
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Varun Saxena commented on YARN-5561:
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Copying my comment over from YARN-5571.
If we have to support fetching all the apps within a cluster, upto a limit,
this currently is not advisable in HBase implementation as it would lead to a
full table scan or a very large scan. Because the API guarantees returning
entities in a descending order by created time. This would mean that we will go
through each row to determine the result set.
It is about taking one of the choices. Do we want to drill down to apps via
flows or list all the apps in a cluster.
We can discuss further in the team on this, depending on the use case. And see
if we can have some workaround.
> [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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