Steve Loughran created YARN-2677:
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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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