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https://issues.apache.org/jira/browse/HADOOP-3098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12582719#action_12582719
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Raghu Angadi commented on HADOOP-3098:
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> If we're going to fix this, why don't we just go ahead and do / and @ for
> Kerberos now rather than require another patch later?
true. I was not sure if these _may_ be required or _will_ be required.
Do we really want dot(.)? Unlike HDFS, we don't use system call to for LocalFS.
So it still goes through shell command.. so '.' will still be treated as
separation between username and group.. just adds to user confusion. If we do
include dot, I need to update the documentation a little bit more.
> 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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