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https://issues.apache.org/jira/browse/YARN-6105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15834350#comment-15834350
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Rohith Sharma K S commented on YARN-6105:
-----------------------------------------

In cloud, it is not guaranteed that only one cluster can run at given point of 
time. I discussed with cloud team today, constant clusterId or storing it 
separately as info does not work for them. Every cluster has its own Id to 
identify uniqueness. There could be 'N' clusterIds but those are independent 
and unique.
So, */clusterids*(with daterange and pagination support) will become more 
important for shared services such as YARN web UI, Tez Web UI or Spar Web UI or 
MR Web UI.

> Support for new REST end point /clusterids
> ------------------------------------------
>
>                 Key: YARN-6105
>                 URL: https://issues.apache.org/jira/browse/YARN-6105
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Rohith Sharma K S
>
> As discussed in YARN-5378 and YARN-6095, it is required to have */clusterids* 
> that returns list of clusterids that back end has is useful. 
> Use case : In cloud, clusters are arbitrarily spin up and destroyed. Each 
> cluster has its own clusterId which UI never knows about it. To all those 
> newly spin up cluster, same ATS server has been used. And sam web UI has been 
> used. Admin can select the clusterId and navigate to any pages. So, it is 
> worth to list ClusterId's from ATS



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