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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, 27 Mar 2017 17:40:41 GMT

    [ https://issues.apache.org/jira/browse/YARN-6384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15943704#comment-15943704
] 

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

bq. This may be confused, the yarn.nodemanager.resource.percentage-physical-cpu-limit can
limit sum of cpu-usage of all containers, but there has no upper limit for each container.

If you look at CGroupsCpuResourceHandlerImpl.preStart it does exactly what you are missing,
a limit per each container:
{code}
      if (strictResourceUsageMode) {
        if (nodeVCores != containerVCores) {
          float containerCPU =
              (containerVCores * yarnProcessors) / (float) nodeVCores;
          int[] limits = getOverallLimits(containerCPU);
          cGroupsHandler.updateCGroupParam(CPU, cgroupId,
              CGroupsHandler.CGROUP_CPU_PERIOD_US, String.valueOf(limits[0]));
          cGroupsHandler.updateCGroupParam(CPU, cgroupId,
              CGroupsHandler.CGROUP_CPU_QUOTA_US, String.valueOf(limits[1]));
        }
      }
{code}

> 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
>
> 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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