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Date: Sun, 2 Dec 2012 21:57:58 +0000 (UTC)
From: "Suresh Srinivas (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-4236) Regression: HDFS-4171 puts
 artificial limit on username length
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    [ https://issues.apache.org/jira/browse/HDFS-4236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13508376#comment-13508376 ] 

Suresh Srinivas commented on HDFS-4236:
---------------------------------------

I marked this jira as a blocker for 2.0.3, to ensure it gets picked up for the release.
                
> Regression: HDFS-4171 puts artificial limit on username length
> --------------------------------------------------------------
>
>                 Key: HDFS-4236
>                 URL: https://issues.apache.org/jira/browse/HDFS-4236
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.0.3-alpha
>            Reporter: Allen Wittenauer
>              Labels: regression
>
> HDFS-4171 made the invalid assumption that there is a common limit on user names at the UNIX level.  Almost all modern systems, when running under a 64-bit kernel, use a pointer instead of a char array in the passwd struct.  This makes usernames essentially unlimited.
> Additionally, IIRC, the only places where HDFS and the OS interact where the username is touched is during group lookup.
> This limit is artificial and should be removed.  There is a very high risk that we will break users, especially service accounts used for automated processes.

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