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https://issues.apache.org/jira/browse/YARN-723?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sandy Ryza resolved YARN-723.
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Resolution: Invalid
> 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: 2.3.0
>
>
> 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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