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Date: Thu, 27 Mar 2008 10:27:28 -0700 (PDT)
From: "Allen Wittenauer (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-3098) dfs -chown does not like "_"
 underscore in user name
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    [ https://issues.apache.org/jira/browse/HADOOP-3098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12582743#action_12582743 ] 

Allen Wittenauer commented on HADOOP-3098:
------------------------------------------

I'm not sure why period (.) would be an issue.  chown and chgrp use colons(:) for user and group separation.  Periods aren't recommended for usage due to how mail servers may interpret them, but I don't know of any standard UNIX commands that choke on it.


> dfs -chown does not like "_" underscore in user name
> ----------------------------------------------------
>
>                 Key: HADOOP-3098
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3098
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.16.0, 0.16.1
>            Reporter: Koji Noguchi
>            Assignee: Raghu Angadi
>            Priority: Blocker
>             Fix For: 0.16.2
>
>         Attachments: HADOOP-3098.patch
>
>
> :~$ hadoop dfs -chown aaa_bbb  /user/knoguchi/test.txt
> chown: 'aaa_bbb' does not match expected pattern for [owner][:group].
> in 0.16.1, only alphabets and numbers are allowed.  Shouldn't '_' be allowed?
> I couldn't find any standard, but in Solaris10, it's defined as 
> http://docs.sun.com/app/docs/doc/816-5174/6mbb98uhg?a=view
> bq. The login (login) and role (role) fields accept a string of no more than eight bytes consisting of characters from the set of alphabetic characters, numeric characters, period (.), underscore (_), and hyphen (-). The first character should be alphabetic and the field should contain at least one lower case alphabetic character. A warning message is displayed if these restrictions are not met.

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