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https://issues.apache.org/jira/browse/YARN-5849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15646642#comment-15646642
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Bibin A Chundatt commented on YARN-5849:
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Thank you [[email protected]] for patch
Patch helps in debugging with detailed logging.
# As per current implementation we do we support 'deferred' mounting of
specific controllers.But when enable mount is false we try to create
{{cGroupPrefix}} for all {{CGroupController}}.
# {{if (!FileUtil.canWrite(yarnHierarchy))}} check should be in else case rt?
> Automatically create YARN control group for pre-mounted cgroups
> ---------------------------------------------------------------
>
> Key: YARN-5849
> URL: https://issues.apache.org/jira/browse/YARN-5849
> Project: Hadoop YARN
> Issue Type: Improvement
> Affects Versions: 2.7.3, 3.0.0-alpha1, 3.0.0-alpha2
> Reporter: Miklos Szegedi
> Assignee: Miklos Szegedi
> Priority: Minor
> Attachments: YARN-5849.000.patch, YARN-5849.001.patch
>
>
> Yarn can be launched with linux-container-executor.cgroups.mount set to
> false. It will search for the cgroup mount paths set up by the administrator
> parsing the /etc/mtab file. You can also specify
> resource.percentage-physical-cpu-limit to limit the CPU resources assigned to
> containers.
> linux-container-executor.cgroups.hierarchy is the root of the settings of all
> YARN containers. If this is specified but not created YARN will fail at
> startup:
> Caused by: java.io.FileNotFoundException:
> /cgroups/cpu/hadoop-yarn/cpu.cfs_period_us (Permission denied)
> org.apache.hadoop.yarn.server.nodemanager.util.CgroupsLCEResourcesHandler.updateCgroup(CgroupsLCEResourcesHandler.java:263)
> This JIRA is about automatically creating YARN control group in the case
> above. It reduces the cost of administration.
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