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https://issues.apache.org/jira/browse/HDFS-4171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13506185#comment-13506185
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Allen Wittenauer commented on HDFS-4171:
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I've opened HDFS-4236 to fix this regression.
> WebHDFS and HttpFs should accept only valid Unix user names
> -----------------------------------------------------------
>
> Key: HDFS-4171
> URL: https://issues.apache.org/jira/browse/HDFS-4171
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.0.2-alpha
> Reporter: Harsh J
> Assignee: Alejandro Abdelnur
> Fix For: 2.0.3-alpha
>
> Attachments: HDFS-4171.patch, HDFS-4171.patch, HDFS-4171.patch,
> HDFS-4171.patch
>
>
> 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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