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https://issues.apache.org/jira/browse/HADOOP-16214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16815780#comment-16815780
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Daryn Sharp commented on HADOOP-16214:
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We need to support the reporter's use case with no risk of compatibility issues.
The scope of the Jira is simply allow not just a/b@R but also a/b/c@R. The
scope is not to rewrite the parser to be complex, contextually sensitive,
return different results, or to involve a change however innocuous to
delegation tokens because you disagree with the behavior.
How to do this with _no risk of incompatibility_?
* Extend the existing regexp to accept not only 0-1 extra components:
{{service(/component)?}} but n-many components: {{service(/component)*}}.
* Restrict the DEFAULT rule to matching 1-2 components so using more components
requires specific configuration.
We cannot unilaterally disregard the conventions established long ago w/o
risking unintended consequences.
> Kerberos name implementation in Hadoop does not accept principals with more
> than two components
> -----------------------------------------------------------------------------------------------
>
> Key: HADOOP-16214
> URL: https://issues.apache.org/jira/browse/HADOOP-16214
> Project: Hadoop Common
> Issue Type: Bug
> Components: auth
> Reporter: Issac Buenrostro
> Priority: Major
> Attachments: HADOOP-16214.001.patch, HADOOP-16214.002.patch,
> HADOOP-16214.003.patch, HADOOP-16214.004.patch, HADOOP-16214.005.patch,
> HADOOP-16214.006.patch, HADOOP-16214.007.patch, HADOOP-16214.008.patch,
> HADOOP-16214.009.patch, HADOOP-16214.010.patch, HADOOP-16214.011.patch
>
>
> org.apache.hadoop.security.authentication.util.KerberosName is in charge of
> converting a Kerberos principal to a user name in Hadoop for all of the
> services requiring authentication.
> Although the Kerberos spec
> ([https://web.mit.edu/kerberos/krb5-1.5/krb5-1.5.4/doc/krb5-user/What-is-a-Kerberos-Principal_003f.html])
> allows for an arbitrary number of components in the principal, the Hadoop
> implementation will throw a "Malformed Kerberos name:" error if the principal
> has more than two components (because the regex can only read serviceName and
> hostName).
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