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https://issues.apache.org/jira/browse/HADOOP-12566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15007587#comment-15007587
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Daniel Templeton commented on HADOOP-12566:
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Unit test failure is unrelated.
> 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
> 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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