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From "Tsuyoshi Ozawa (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12566) Add NullGroupMapping
Date Mon, 16 Nov 2015 08:35:11 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15006342#comment-15006342
] 

Tsuyoshi Ozawa commented on HADOOP-12566:
-----------------------------------------

[~d.m.t@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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