Alejandro Abdelnur commented on YARN-2424:

I think I did, if I'm reading correctly you are stating that is better for 
troubleshooting, specially in multi-tenant scenarios: 

bq. It's also worth pointing out that one of the key benefits of running tasks 
as the user who submitted them is that it makes troubleshooting much easier. 
When one hops on a node, it is evident as to which user's tasks one is looking 
at it, even if those tasks aren't validated as "that" user. This is especially 
important in heavy multi-tenant scenarios.

> 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
>              Labels: regression
>         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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