Daniel Templeton reassigned YARN-4353:

    Assignee: Daniel Templeton

> Provide short circuit user group mapping for NM/AM
> --------------------------------------------------
>                 Key: YARN-4353
>                 URL: https://issues.apache.org/jira/browse/YARN-4353
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: nodemanager
>    Affects Versions: 2.7.1
>            Reporter: Daniel Templeton
>            Assignee: Daniel Templeton
> When the NM launches an AM, the {{ContainerLocalizer}} gets the current user 
> from {{UserGroupInformation}}, which triggers user group mapping, even though 
> the user groups are never accessed.  If secure LDAP is configured for group 
> mapping, then there are some additional complications created by the 
> unnecessary group resolution.  Additionally, it adds unnecessary latency to 
> the container launch time.
> To address the issue, before getting the current user, the 
> {{ContainerLocalizer}} should configure {{UserGroupInformation}} with a null 
> group mapping service that quickly and quietly returns an empty group list 
> for all users.

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