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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4225) Add preemption status to yarn queue -status for capacity scheduler
Date Thu, 03 Dec 2015 17:50:11 GMT

    [ https://issues.apache.org/jira/browse/YARN-4225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15038195#comment-15038195
] 

Jason Lowe commented on YARN-4225:
----------------------------------

With deployments of multiple clusters it's easy to get into situations where newer clients
end up talking to older clusters.  Clusters are rarely upgraded at the same time, and remote
access of one cluster for a job's input is not rare at least in our setups.  That's a perfect
example of a newer client talking to an older server.  It may not be officially supported,
but it's not going to be a rare occurrence (for HDFS, at least).

For this specific case I think the need for the feature would be rare, hence my hedging about
whether we really need it.  It's not that the new client completely breaks talking to the
older server, it just would be capable of returning misleading information about the preemption
status.  I'm OK if we decide this scenario isn't worth supporting.  (It's not hard to do so,
just tedious and a bit messy with the API.)  But in general there will be cases where breaking
compatibility between a newer client and an older server is going to be problematic even if
it isn't officially supported because of the multiple cluster scenarios.

> Add preemption status to yarn queue -status for capacity scheduler
> ------------------------------------------------------------------
>
>                 Key: YARN-4225
>                 URL: https://issues.apache.org/jira/browse/YARN-4225
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacity scheduler, yarn
>    Affects Versions: 2.7.1
>            Reporter: Eric Payne
>            Assignee: Eric Payne
>            Priority: Minor
>         Attachments: YARN-4225.001.patch, YARN-4225.002.patch, YARN-4225.003.patch
>
>




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