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https://issues.apache.org/jira/browse/YARN-782?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sandy Ryza updated YARN-782:
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Attachment: YARN-782-1.patch
> vcores-pcores ratio functions differently from vmem-pmem ratio in misleading
> way
> ---------------------------------------------------------------------------------
>
> Key: YARN-782
> URL: https://issues.apache.org/jira/browse/YARN-782
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: nodemanager
> Affects Versions: 2.0.4-alpha
> Reporter: Sandy Ryza
> Assignee: Sandy Ryza
> Priority: Critical
> Attachments: YARN-782-1.patch, YARN-782.patch
>
>
> The vcores-pcores ratio functions differently from the vmem-pmem ratio in the
> sense that the vcores-pcores ratio has an impact on allocations and the
> vmem-pmem ratio does not.
> If I double my vmem-pmem ratio, the only change that occurs is that my
> containers, after being scheduled, are less likely to be killed for using too
> much virtual memory. But if I double my vcore-pcore ratio, my nodes will
> appear to the ResourceManager to contain double the amount of CPU space,
> which will affect scheduling decisions.
> The lack of consistency will exacerbate the already difficult problem of
> resource configuration.
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