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Posted to yarn-issues@hadoop.apache.org by "Alejandro Abdelnur (JIRA)" <ji...@apache.org> on 2013/05/23 21:33:22 UTC

[jira] [Commented] (YARN-723) Yarn default value of physical cpu cores to virtual core is 2

    [ https://issues.apache.org/jira/browse/YARN-723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13665529#comment-13665529 ] 

Alejandro Abdelnur commented on YARN-723:
-----------------------------------------

Bikas, where are the implicit MR assumptions on CPUs you are referring to?
                
> Yarn default value of physical cpu cores to virtual core is 2
> -------------------------------------------------------------
>
>                 Key: YARN-723
>                 URL: https://issues.apache.org/jira/browse/YARN-723
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.0.4-alpha
>            Reporter: Bikas Saha
>             Fix For: 2.0.5-beta
>
>
> The default virtual core allocation in the RM is 1. That means every container will get 1 virtual core == 1/2 a physical core. Not sure if this breaks implicit MR assumptions of maps/reduces getting at least 1 physical cpu.

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