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https://issues.apache.org/jira/browse/HADOOP-6457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12792623#action_12792623
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Philip Zeyliger commented on HADOOP-6457:
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Do note that users can be in more than one group, so hadoop.group.name should
probably be hadoop.group.names, and be comma-delimited.
> Set Hadoop User/Group by System properties or environment variables
> -------------------------------------------------------------------
>
> Key: HADOOP-6457
> URL: https://issues.apache.org/jira/browse/HADOOP-6457
> Project: Hadoop Common
> Issue Type: New Feature
> Components: security
> Reporter: issei yoshida
> Attachments: 6457.patch
>
>
> Hadoop User/Group can be set by System properties or environment variables.
> For example, in environment variables,
> export HADOOP_USER=test
> export HADOOP_GROUP=user
> or in your MapReduce,
> System.setProperty("hadoop.user.name", "test");
> System.setProperty("hadoop.group.name", "user");
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