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https://issues.apache.org/jira/browse/HDFS-4236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13512064#comment-13512064
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Alejandro Abdelnur commented on HDFS-4236:
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Suresh, without HDFS-4171 usernames containing '_', '-' & '.' don't work. I
think that is a bigger issue than the length limitation. I'd say it would be
more common to have one of those chars in the username than a username with
length greater than 31. Your opinion is against a config option. I'll take care
of adding the release notes incompatible changes today or tomorrow. Sounds good?
> 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
> Priority: Blocker
> 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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