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https://issues.apache.org/jira/browse/HDFS-4983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13839784#comment-13839784
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Yongjun Zhang commented on HDFS-4983:
-------------------------------------
Thanks all for the discussion and comments.
My 2 cents: If we simply change the default to support numerical user name but
without configurability, then for users who don't want to use numerical user
name (and want to treat numerical user name illegal), s/he doesn't have the
flexibility.
> 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
> Assignee: Yongjun Zhang
> Labels: patch
> Attachments: HDFS-4983.001.patch, HDFS-4983.002.patch,
> HDFS-4983.003.patch
>
>
> 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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