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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-2677) registry punycoding of usernames doesn't fix all usernames to be DNS-valid
Date Fri, 10 Oct 2014 19:44:34 GMT
Steve Loughran created YARN-2677:
------------------------------------

             Summary: registry punycoding of usernames doesn't fix all usernames to be DNS-valid
                 Key: YARN-2677
                 URL: https://issues.apache.org/jira/browse/YARN-2677
             Project: Hadoop YARN
          Issue Type: Sub-task
    Affects Versions: 2.6.0
            Reporter: Steve Loughran
            Assignee: Steve Loughran


The registry has a restriction "DNS-valid names only" to retain the future option of DNS exporting
of the registry.

to handle complex usernames, it punycodes the username first, using Java's {{java.net.IDN}}
class.

This turns out to only map high unicode-> ASCII, and does nothing for ascii-but-invalid-hostname
chars, so stopping users with DNS-illegal names (e.g. with an underscore in them) from being
able to register



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