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Posted to common-issues@hadoop.apache.org by "Karthik Kambatla (JIRA)" <ji...@apache.org> on 2015/12/23 23:40:46 UTC

[jira] [Updated] (HADOOP-12566) Add NullGroupMapping

     [ https://issues.apache.org/jira/browse/HADOOP-12566?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Karthik Kambatla updated HADOOP-12566:
--------------------------------------
       Resolution: Fixed
     Hadoop Flags: Reviewed
    Fix Version/s: 2.9.0
           Status: Resolved  (was: Patch Available)

Just committed this to trunk and branch-2. 

> Add NullGroupMapping
> --------------------
>
>                 Key: HADOOP-12566
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12566
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Daniel Templeton
>            Assignee: Daniel Templeton
>             Fix For: 2.9.0
>
>         Attachments: HADOOP-12566.001.patch, HADOOP-12566.002.patch
>
>
> Add a {{NullGroupMapping}} for cases where user groups are not used.  {{ShellBasedUnixGroupMapping}} can be used in places where latency is not important.  In places like starting a container, it's worth in to avoid the extra fork and exec.



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