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https://issues.apache.org/jira/browse/HADOOP-8809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13456360#comment-13456360
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Steve Loughran commented on HADOOP-8809:
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+1, removes confusion.
I need to look at what BT does first, as I've been having UID grief downstream.
Clearly it's not from the hadoop-core RPM
> RPMs should skip useradds if the users already exist
> ----------------------------------------------------
>
> Key: HADOOP-8809
> URL: https://issues.apache.org/jira/browse/HADOOP-8809
> Project: Hadoop Common
> Issue Type: Bug
> Components: scripts
> Affects Versions: 1.0.3
> Reporter: Steve Loughran
> Priority: Minor
>
> The hadoop.spec preinstall script creates users -but it does this even if
> they already exist. This may causes problems if the installation has already
> got those users with different uids. A check with {{id}} can avoid this.
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