Junping Du commented on YARN-3399:

I would also suggest to deprecate existing "yarn.resourcemanager.cluster-id" 
and rename to "yarn.cluster.id" because cluster ID now is a broader concept 
than just for election of RMs.

> Default cluster ID for RM HA
> ----------------------------
>                 Key: YARN-3399
>                 URL: https://issues.apache.org/jira/browse/YARN-3399
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>            Reporter: Zhijie Shen
> 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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