[jira] [Commented] (HDFS-4983) Numeric usernames do not work with WebHDFS FS

["Kousuke Saruta (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-4983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13712115#comment-13712115 ] 

Kousuke Saruta commented on HDFS-4983:
--------------------------------------

Hi Harsh,
I think the reason is that USER_PATTERN_DEFAULT field in UserProvider is set to "^[A-Za-z_][A-Za-z0-9._-]*[$]?$".
But some authentication systems like shadow allow less restricted user name.
                
> Numeric usernames do not work with WebHDFS FS
> ---------------------------------------------
>
>                 Key: HDFS-4983
>                 URL: https://issues.apache.org/jira/browse/HDFS-4983
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: webhdfs
>    Affects Versions: 2.0.0-alpha
>            Reporter: Harsh J
>
> Per the file hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/web/resources/UserParam.java, the DOMAIN pattern is set to: {{^[A-Za-z_][A-Za-z0-9._-]*[$]?$}}.
> Given this, using a username such as "123" seems to fail for some reason (tried on insecure setup):
> {code}
> [123@host-1 ~]$ whoami
> 123
> [123@host-1 ~]$ hadoop fs -fs webhdfs://host-2.domain.com -ls /
> -ls: Invalid value: "123" does not belong to the domain ^[A-Za-z_][A-Za-z0-9._-]*[$]?$
> Usage: hadoop fs [generic options] -ls [-d] [-h] [-R] [<path> ...]
> {code}

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