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https://issues.apache.org/jira/browse/HADOOP-7603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13095736#comment-13095736
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Eli Collins commented on HADOOP-7603:
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What if these users already exist on the system?
> Set default hdfs, mapred uid, and hadoop group gid for RPM packages
> -------------------------------------------------------------------
>
> Key: HADOOP-7603
> URL: https://issues.apache.org/jira/browse/HADOOP-7603
> Project: Hadoop Common
> Issue Type: Bug
> Environment: Java, Redhat EL, Ubuntu
> Reporter: Eric Yang
> Assignee: Eric Yang
>
> Hadoop rpm package creates hdfs, mapped users, and hadoop group for
> automatically setting up pid directory and log directory with proper
> permission. The default headless users should have a fixed uid, and gid
> numbers defined.
> Searched through the standard uid and gid on both Redhat and Debian distro.
> It looks like:
> {noformat}
> uid: 201 for hdfs
> uid: 202 for mapred
> gid: 49 for hadoop
> {noformat}
> would be free for use.
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