Zhankun Tang created YARN-8924:
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Summary: 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
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.
Thoughts? [~leftnoteasy], [~vinodkv]
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