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https://issues.apache.org/jira/browse/HDFS-4236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13526036#comment-13526036
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Suresh Srinivas commented on HDFS-4236:
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+1 for the change Alejandro. Thank you for making this change.
> 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
> Assignee: Alejandro Abdelnur
> Priority: Blocker
> Labels: regression
> Attachments: HDFS-4171.patch
>
>
> 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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