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https://issues.apache.org/jira/browse/YARN-8924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16667291#comment-16667291
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Zhankun Tang commented on YARN-8924:
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Thanks for the review. [[email protected]]
> Refine the document or code related to legacy CPU isolation/enforcement
> -----------------------------------------------------------------------
>
> Key: YARN-8924
> URL: https://issues.apache.org/jira/browse/YARN-8924
> Project: Hadoop YARN
> Issue Type: Improvement
> Reporter: Zhankun Tang
> Assignee: Zhankun Tang
> Priority: Minor
>
> This is to re-think the legacy configuration/code of CPU resource isolation.
> In YARN-3542, we involve _CGroupsCpuResourceHandlerImpl_ based on new
> _ResourceHandler_ mechanism but leaves the configuration
> "yarn.nodemanager.linux-container-executor.resources-handler.class" there for
> a long time. Now it seems confusing to the end user.
> Check YARN-6729, one sets "_DefaultLCEResourcesHandler_" and found that give
> "percentage-physical-cpu-limit" a value less than "100" doesn't work.
> As far as I know, internally, the _CgroupsLCEResourcesHandler_ and
> _DefaultLCEResourcesHandler are_ both deprecated. YARN won't use them anymore.
> Instead, YARN uses _CGroupsCpuResourceHandlerImpl_ to do CPU isolation and
> only in LCE. If we want to enforce CPU usage, we must set LCE and
> CgroupsLCEResourceHandler like this:
> {noformat}
> <property>
> <description>who will execute(launch) the containers.</description>
> <name>yarn.nodemanager.container-executor.class</name>
>
> <value>org.apache.hadoop.yarn.server.nodemanager.LinuxContainerExecutor</value>
> </property>
> <property>
> <description>The class which should help the LCE handle
> resources.</description>
>
> <name>yarn.nodemanager.linux-container-executor.resources-handler.class</name>
>
> <value>org.apache.hadoop.yarn.server.nodemanager.util.CgroupsLCEResourcesHandler<value>
> </property>{noformat}
> Based on above settings can the CPU related settings like
> "percentage-physical-cpu-limit" works as expected.
> To avoid confusing like YARN-6729, we can do two things:
> # More clear document about how should user configure CPU
> isolation/enforcement in "NodeManagerCgroups.md"
> # Make "ResourceHandlerModuler" stable and remove legacy code and update the
> document to recommend new setting "yarn.nodemanager.resource.cpu.enabled"
> Thoughts? [~leftnoteasy], [~vinodkv], [~vvasudev]
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