Miklos Szegedi created YARN-6433:
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             Summary: Only accessible cgroup mount directories should be 
selected for a controller
                 Key: YARN-6433
                 URL: https://issues.apache.org/jira/browse/YARN-6433
             Project: Hadoop YARN
          Issue Type: Bug
          Components: nodemanager
    Affects Versions: 3.0.0-alpha3
            Reporter: Miklos Szegedi
            Assignee: Miklos Szegedi


I have a Ubuntu16 box that returns the following error with pre-mounted cgroups 
on the latest trunk:
{code}
2017-04-03 19:42:18,511 WARN 
org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.resources.CGroupsHandlerImpl:
 Cgroups not accessible /run/lxcfs/controllers/cpu,cpuacct
{code}
The version is:
{code}
$ uname -a
Linux mybox 4.4.0-24-generic #43-Ubuntu SMP Wed Jun 8 19:27:37 UTC 2016 x86_64 
x86_64 x86_64 GNU/Linux
{code}
The following cpu cgroup filesystems are mounted:
{code}
$ grep cpuacct /etc/mtab
cgroup /sys/fs/cgroup/cpu,cpuacct cgroup 
rw,nosuid,nodev,noexec,relatime,cpu,cpuacct,nsroot=/ 0 0
cpu,cpuacct /run/lxcfs/controllers/cpu,cpuacct cgroup 
rw,relatime,cpu,cpuacct,nsroot=/ 0 0
{code}
/sys/fs/cgroup is accessible to my yarn user, so it should be selected instead 
of /run/lxcfs/controllers



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