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https://issues.apache.org/jira/browse/YARN-5378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15825563#comment-15825563
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Rohith Sharma K S commented on YARN-5378:
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Thanks Sangjin for the patch.. +1 LGTM for the patch.
> Accommodate app-id->cluster mapping
> -----------------------------------
>
> Key: YARN-5378
> URL: https://issues.apache.org/jira/browse/YARN-5378
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: timelineserver
> Reporter: Joep Rottinghuis
> Assignee: Sangjin Lee
> Labels: yarn-5355-merge-blocker
> Attachments: YARN-5378-YARN-5355.01.patch,
> YARN-5378-YARN-5355.02.patch, YARN-5378-YARN-5355.03.patch
>
>
> In discussion with [~sjlee0], [~vrushalic], [~subru], and [~curino] a
> use-case came up to be able to map from application-id to cluster-id in
> context of federation for Yarn.
> What happens is that a "random" cluster in the federation is asked to
> generate an app-id and then potentially a different cluster can be the "home"
> cluster for the AM. Furthermore, tasks can then run in yet other clusters.
> In order to be able to pull up the logical home cluster on which the
> application ran, there needs to be a mapping from application-id to
> cluster-id. This mapping is available in the federated Yarn case only during
> the active live of the application.
> A similar situation is common in our larger production environment. Somebody
> will complain about a slow job, some failure or whatever. If we're lucky we
> have an application-id. When we ask the user which cluster they ran on,
> they'll typically answer with the machine from where they launched the job
> (many users are unaware of the underlying physical clusters). This leaves us
> to spelunk through various RM ui's to find a matching epoch in the
> application ID.
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