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https://issues.apache.org/jira/browse/HADOOP-9023?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13494197#comment-13494197
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Alejandro Abdelnur commented on HADOOP-9023:
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In a secure setup the user names must match a Unix user name.
[a-z_][a-z0-9_-]*[$] with a min/max of 1/31
The correct thing to do would be the USER_PATTERN to enforce the same pattern
as UNIX, both in HttpFS and in WebHDFS
> HttpFs is too restrictive on usernames
> --------------------------------------
>
> Key: HADOOP-9023
> URL: https://issues.apache.org/jira/browse/HADOOP-9023
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Harsh J
>
> HttpFs tries to use UserProfile.USER_PATTERN to match all usernames before a
> doAs impersonation function. This regex is too strict for most usernames, as
> it disallows any special character at all. We should relax it more or ditch
> needing to match things there.
> WebHDFS currently has no such limitations.
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