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From "Miklos Szegedi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6384) Add configuratin to set max cpu usage when strict-resource-usage is false with cgroups
Date Mon, 09 Oct 2017 16:41:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-6384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16197265#comment-16197265
] 

Miklos Szegedi commented on YARN-6384:
--------------------------------------

My opinion is that the distinction between strict and non-strict mode should be, whether cpu.cfs_quota_us
or cpu.shares is used. My view of non-strict mode is that there are no upper limits and the
scheduler shares the CPU resources based on the shares specified.

> Add configuratin to set max cpu usage when strict-resource-usage is false with cgroups
> --------------------------------------------------------------------------------------
>
>                 Key: YARN-6384
>                 URL: https://issues.apache.org/jira/browse/YARN-6384
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: dengkai
>         Attachments: YARN-6384-0.patch, YARN-6384-1.patch, YARN-6384-2.patch
>
>
> When using cgroups on yarn, if yarn.nodemanager.linux-container-executor.cgroups.strict-resource-usage
is false, user may get very more cpu time than expected based on the vcores. There should
be a upper limit even resource-usage is not strict, just like a percentage which user can
get more than promised by vcores. I think it's important in a shared cluster.



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