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https://issues.apache.org/jira/browse/YARN-2677?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran updated YARN-2677:
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Attachment: YARN-2677-002.patch
Updated patch which also converts usernames to lower case (english locale).
This handles names like {{Administrator}} which you can see on windows
> 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
> Components: api, resourcemanager
> Affects Versions: 2.6.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Attachments: YARN-2677-001.patch, YARN-2677-002.patch
>
>
> 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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