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From "Rohith Sharma K S (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5378) Accommodate app-id->cluster mapping
Date Tue, 17 Jan 2017 09:36:26 GMT

    [ https://issues.apache.org/jira/browse/YARN-5378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15825716#comment-15825716
] 

Rohith Sharma K S commented on YARN-5378:
-----------------------------------------

[~varun_saxena] I think  you misunderstood the use case. In cloud, clusters are arbitrarily
spin up and destroyed. Each cluster has its own Id which UI never knows about it. To all those
newly spin up cluster, same UI is being used. Admin can select the clusterId and navigate
to any pages. So, it is worth to list ClusterId's from ATS rather than going with configuration
model. 

> 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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