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https://issues.apache.org/jira/browse/HADOOP-12566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15070277#comment-15070277
]
Hudson commented on HADOOP-12566:
---------------------------------
FAILURE: Integrated in Hadoop-trunk-Commit #9020 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/9020/])
HADOOP-12566. Add NullGroupMapping. (Daniel Templeton via kasha) (kasha: rev
8b1837fcd1f01d881deacd72b4e548ec2bdcb7ad)
* hadoop-common-project/hadoop-common/CHANGES.txt
*
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/NullGroupsMapping.java
*
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestNullGroupsMapping.java
> 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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