Wei Yan commented on YARN-2194:

[~sidharta-s], thanks for the advice. Use a different separator LGTM. In that 
way, we can trust the "cpu" controller, and can also help avoid doing 
OS-specific changes.
Comments? [~kasha], [~vinodkv], [~mjacobs].

And for the new CGroupsHandlerImpl, didn't find any problem when I checked the 
patch. [~vvasudev], please correct me if I missed anything. 

> 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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