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https://issues.apache.org/jira/browse/YARN-2424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14100134#comment-14100134
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Alejandro Abdelnur commented on YARN-2424:
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please refer to yarn-1253 comments, it was stated there that the old behavior 
had security issues.

> 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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