Karthik Kambatla commented on YARN-2194:

I haven't looked at it closely, but think Yarn doesn't pick the separator. If 
we could easily change the separator from within Yarn, that is without 
requiring any other environment changes by the admin, I ll be a +1 for that 
change. By the way, Linux allows anything but '/' and '%' for filenames. So, 
picking ':' or '|' is only less likely to cause issues in the future. Who would 
have thought they would use ', in a filename?

If we continue with the patch posted here, I think [~mjacobs]' suggestion makes 

> Cgroups cease to work in RHEL7
> ------------------------------
>                 Key: YARN-2194
>                 URL: https://issues.apache.org/jira/browse/YARN-2194
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>    Affects Versions: 2.7.0
>            Reporter: Wei Yan
>            Assignee: Wei Yan
>            Priority: Critical
>         Attachments: YARN-2194-1.patch, YARN-2194-2.patch, YARN-2194-3.patch
> In RHEL7, the CPU controller is named "cpu,cpuacct". The comma in the 
> controller name leads to container launch failure. 
> RHEL7 deprecates libcgroup and recommends the user of systemd. However, 
> systemd has certain shortcomings as identified in this JIRA (see comments). 
> This JIRA only fixes the failure, and doesn't try to use systemd.

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