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From "Miklos Szegedi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-5849) Automatically create YARN control group for pre-mounted cgroups
Date Mon, 07 Nov 2016 21:29:58 GMT
Miklos Szegedi created YARN-5849:
------------------------------------

             Summary: 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: 3.0.0-alpha1, 2.7.3, 3.0.0-alpha2
            Reporter: Miklos Szegedi
            Assignee: Miklos Szegedi
            Priority: Minor


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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