[ 
https://issues.apache.org/jira/browse/HADOOP-13965?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Yiqun Lin updated HADOOP-13965:
-------------------------------
    Description: 
{code:title=Groups.java}
      public Groups(Configuration conf, final Timer timer) {
       impl = 
      ReflectionUtils.newInstance(
          conf.getClass(CommonConfigurationKeys.HADOOP_SECURITY_GROUP_MAPPING, 
                        ShellBasedUnixGroupsMapping.class, 
                        GroupMappingServiceProvider.class), 
          conf);
      ...
}
{code}
The default value of setting {{hadoop.security.group.mapping}} is different in 
code and config file. In file {{core-default.xml}}, it uses the class 
{{JniBasedUnixGroupsMappingWithFallback}} and this should be the true value.

  was:
{code:title=Groups.java}
      public Groups(Configuration conf, final Timer timer) {
       impl = 
      ReflectionUtils.newInstance(
          conf.getClass(CommonConfigurationKeys.HADOOP_SECURITY_GROUP_MAPPING, 
                        ShellBasedUnixGroupsMapping.class, 
                        GroupMappingServiceProvider.class), 
          conf);
      ...
}
{code}
The default value of setting {{hadoop.security.group.mapping}} is different in 
code and config file. In the core-default.xml, it uses the class 
{{JniBasedUnixGroupsMappingWithFallback}} and this should be a true.


> Groups should be consistent in using group mapping class
> --------------------------------------------------------
>
>                 Key: HADOOP-13965
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13965
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Yiqun Lin
>            Assignee: Yiqun Lin
>            Priority: Minor
>
> {code:title=Groups.java}
>       public Groups(Configuration conf, final Timer timer) {
>        impl = 
>       ReflectionUtils.newInstance(
>           
> conf.getClass(CommonConfigurationKeys.HADOOP_SECURITY_GROUP_MAPPING, 
>                         ShellBasedUnixGroupsMapping.class, 
>                         GroupMappingServiceProvider.class), 
>           conf);
>       ...
> }
> {code}
> The default value of setting {{hadoop.security.group.mapping}} is different 
> in code and config file. In file {{core-default.xml}}, it uses the class 
> {{JniBasedUnixGroupsMappingWithFallback}} and this should be the true value.



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