Zhijie Shen commented on YARN-3040:

bq.  if cluster-id is set, and if not, generate one like 
cluster-<rm-start-timestamp> without having a default value per se?

I originally propose this way, but it turns out to be difficult to coordinate 
<rm-start-timestamp> among multiple RMs and over RM restarting. IAC, let's file 
a separate Jira to continue the discussion of default cluster ID for RM HA: 

> [Data Model] Make putEntities operation be aware of the app's context
> ---------------------------------------------------------------------
>                 Key: YARN-3040
>                 URL: https://issues.apache.org/jira/browse/YARN-3040
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Sangjin Lee
>            Assignee: Zhijie Shen
>         Attachments: YARN-3040.1.patch, YARN-3040.2.patch, YARN-3040.3.patch, 
> YARN-3040.4.patch, YARN-3040.5.patch
> Per design in YARN-2928, implement client-side API for handling *flows*. 
> Frameworks should be able to define and pass in all attributes of flows and 
> flow runs to YARN, and they should be passed into ATS writers.
> YARN tags were discussed as a way to handle this piece of information.

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