Zhijie Shen commented on YARN-3399:

Thanks, Vinod! This proposal sounds almost good to me, but I think we need to 
rethink what's the default cluster ID.  "default-$(RM-host-name)-cluster" may 
not work because "yarn.resourcemanager.hostname" is by default, such 
that different RMs may still use the same cluster ID. Even if we use IP address 
to lookup host name, it's likely to end up with the same "localhost".

> Consider having a Default cluster ID
> ------------------------------------
>                 Key: YARN-3399
>                 URL: https://issues.apache.org/jira/browse/YARN-3399
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>            Reporter: Zhijie Shen
>            Assignee: Brahma Reddy Battula
> In YARN-3040, timeline service will set the default cluster ID if users don't 
> provide one. RM HA's current behavior is a bit different when users don't 
> provide cluster ID. IllegalArgumentException will throw instead. Let's 
> continue the discussion if RM HA needs the default cluster ID or not here, 
> and what's the proper default cluster ID.

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