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https://issues.apache.org/jira/browse/MAPREDUCE-2376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13005838#comment-13005838
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Allen Wittenauer commented on MAPREDUCE-2376:
---------------------------------------------
IIRC, the history behind this was that on most UNIX and UNIX-like systems (OS X
being a big exception) assigns valid user accounts uid > 1000 when using their
utilities. So this check was a safety to prevent accounts with special
privileges from executing it.
> test-task-controller fails if run as a userid < 1000
> ----------------------------------------------------
>
> Key: MAPREDUCE-2376
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2376
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 0.22.0
> Reporter: Todd Lipcon
> Fix For: 0.22.0
>
>
> test-task-controller tries to verify that the task-controller won't run on
> behalf of users with uid < 1000. This makes the test fail when running in
> some test environments - eg our hudson jobs internally run as a system user
> with uid 101.
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