Alejandro Abdelnur commented on YARN-2424:

I disagree in me being rude (or very rude) just for disagreeing with something. 
IMO security fixes trump backwards compatibility.

Anyway, I'm -0 with the patch if the WARNs are printed in in the RM at startup 
as Owen suggests. I insists that the WARN should be in the stderr/stdout of 
every container. Otherwise this will go completely unnoticed to users running 
apps. It should be obvious to them that they are exposed.

> LCE should support non-cgroups, non-secure mode
> -----------------------------------------------
>                 Key: YARN-2424
>                 URL: https://issues.apache.org/jira/browse/YARN-2424
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>    Affects Versions: 2.3.0, 2.4.0, 2.5.0, 2.4.1
>            Reporter: Allen Wittenauer
>            Priority: Blocker
>         Attachments: YARN-2424.patch
> After YARN-1253, LCE no longer works for non-secure, non-cgroup scenarios.  
> This is a fairly serious regression, as turning on LCE prior to turning on 
> full-blown security is a fairly standard procedure.

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