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From "Joep Rottinghuis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5378) Accomodate app-id->cluster mapping
Date Thu, 14 Jul 2016 19:43:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-5378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15378224#comment-15378224
] 

Joep Rottinghuis commented on YARN-5378:
----------------------------------------

Yeah, either flowName!cluster1@dc2:foo@daily_hive_report or cluster1@dc2!flowName:foo@daily_hive_report,
except that our current model doesn't really allow for that prefix. From the key layout the
cluster would be better.
On the other hand, how many clusters will we have? We can still either provide the cluster
in the query and pull a few columns back or not and pull all back.
Given the volume I don't think that the column names will make much difference.

> Accomodate 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: Joep Rottinghuis
>
> 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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