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https://issues.apache.org/jira/browse/HADOOP-4429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12640542#action_12640542
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Owen O'Malley commented on HADOOP-4429:
---------------------------------------

+1 for the return of DrWho !

Historical background:

Hadoop used to default to "Dr Who" as the user id, if it couldn't figure out 
your username from the system properties. It was removed because of the space 
and the assertion that it never happened. Introduced in HADOOP-52 and removed 
by HADOOP-2833.

> Misconfigured UNIX Groups Break Hadoop
> --------------------------------------
>
>                 Key: HADOOP-4429
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4429
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>         Environment: UNIX, Linux
>            Reporter: Alex Loddengaard
>            Priority: Minor
>
> If a UNIX user has misconfigured groups, either locally or through LDAP, then 
> Hadoop will not be able to start.

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