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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4512) Provide a knob to turn on over-allocation
Date Mon, 11 Jan 2016 02:23:39 GMT

    [ https://issues.apache.org/jira/browse/YARN-4512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15091339#comment-15091339

Karthik Kambatla commented on YARN-4512:

bq. Regarding the overallocation vs oversubscription, I'm more concerned about consistency,
an example is {{Context}} in the NM:
Fair point. Will fix them up in the next iteration.

bq. I'd say the RM should know what the NM is doing, otherwise, after a container preemption,
the RM may try to keep doing the same and the NM preempting again.
When the NM preempts a container, it needs to provide that information to the RM anyway so
the container is allocated elsewhere. The threshold itself is inconsequential here, no? The
RM might be able to use the preemptionThreshold as a lookahead, but I wonder if it defeats
the purpose of having two configs in the first place. 

> Provide a knob to turn on over-allocation
> -----------------------------------------
>                 Key: YARN-4512
>                 URL: https://issues.apache.org/jira/browse/YARN-4512
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: nodemanager
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>         Attachments: YARN-4512-YARN-1011.001.patch, yarn-4512-yarn-1011.002.patch

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