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https://issues.apache.org/jira/browse/HADOOP-12566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15006342#comment-15006342
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Tsuyoshi Ozawa commented on HADOOP-12566:
-----------------------------------------
[~d....@gmx.net] thank you for taking this issue. I've not looked at the patch
deeper, but could you fix javac warnings?
{quote}
[WARNING]
/testptch/hadoop/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestNullGroupsMapping.java:
/testptch/hadoop/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestNullGroupsMapping.java
uses unchecked or unsafe operations.
[WARNING]
/testptch/hadoop/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestNullGroupsMapping.java:
Recompile with -Xlint:unchecked for details.
{quote}
> 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
>
>
> 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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