Junping Du commented on YARN-3461:

I would agree most of comments in YARN-3391. Like I proposed in that jira, can 
we have a configurable policy to group applications into flow by default if 
user doesn't specify flow name for application? 
For example, assume we have 3 policies can be configured (no matter what is 
default policy): 1. group applications into flow by application name; 2. group 
each applications into isolated flows; 3. group each applications into a single 
default flow (more like test purpose). Developers/users in future can 
choose/extend these policies to meet their scenarios more closely. Thoughts?

> Consolidate flow name/version/run defaults
> ------------------------------------------
>                 Key: YARN-3461
>                 URL: https://issues.apache.org/jira/browse/YARN-3461
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Zhijie Shen
>            Assignee: Zhijie Shen
> In YARN-3391, it's not resolved what should be the defaults for flow 
> name/version/run. Let's continue the discussion here and unblock YARN-3391 
> from moving forward.

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