Li Lu commented on YARN-3864:

This issue becomes a major blocker for the web UI POC since we cannot list 
applications within one flowrun. Meanwhile, could anyone remind me where did we 
store this information in the HBase storage? 

As a big picture I assume there is an "applications" section in our flowrun 
endpoint's return value, which can be similar to the "flowruns" section in our 
/flows endpoint, but let's make sure we do have that information first (and 
hopefully do not need to set up coprocessors). 

> 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
> 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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