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https://issues.apache.org/jira/browse/HADOOP-9778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13721039#comment-13721039
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Daryn Sharp commented on HADOOP-9778:
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If we are *nix shell expanding usernames, that definitely needs to be fixed. I
personally agree with the original premise of let the OS decide but I suppose
you could make the pattern ".*" if that's what you want.
> Support configurable user name and group name validation patterns in chown
> and chgrp shell commands.
> ----------------------------------------------------------------------------------------------------
>
> Key: HADOOP-9778
> URL: https://issues.apache.org/jira/browse/HADOOP-9778
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs
> Affects Versions: 3.0.0, 2.3.0
> Reporter: Chris Nauroth
> Priority: Minor
>
> The chown and chgrp shell commands enforce a valid set of characters for user
> names and group names. The validation rules for user names and group names
> vary across different OSes, so this is a portability problem and a
> maintenance burden. It requires us to change the code every time we discover
> a difference in the rules. I propose that we remove this validation logic
> and instead pass through input user names and group names to the OS. We can
> handle error reporting by catching errors returned from the OS.
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