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https://issues.apache.org/jira/browse/YARN-3864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14940551#comment-14940551
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Varun Saxena commented on YARN-3864:
------------------------------------

Yeah but this is similar to what we do while querying entity. 
These optional params, if provided can preclude the need to look up flow 
context from app to flow mapping table. 
And user id would be required anyways because it cannot be retrieved from app 
to flow mapping table.

> Implement support for querying single app and all apps for a flow run
> ---------------------------------------------------------------------
>
>                 Key: YARN-3864
>                 URL: https://issues.apache.org/jira/browse/YARN-3864
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: YARN-2928
>            Reporter: Varun Saxena
>            Assignee: Varun Saxena
>            Priority: Blocker
>         Attachments: YARN-3864-YARN-2928.01.patch
>
>
> This JIRA will handle support for querying all apps for a flow run in HBase 
> reader implementation.
> And also REST API implementation for single app and multiple apps.



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