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https://issues.apache.org/jira/browse/HADOOP-16214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16803018#comment-16803018
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Erik Krogen commented on HADOOP-16214:
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I see some discussion of Hadoop's handling of Kerberos names containing slashes
in HADOOP-12751 (starting
[here|https://issues.apache.org/jira/browse/HADOOP-12751?focusedCommentId=15124818&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15124818]).
It looks like eventually it was decided that it makes sense to allow Kerberos
identities which contain slashes in a way that don't confirm with Hadoop's
normal expectation of {{user/host@realm}} (see
[this|https://issues.apache.org/jira/browse/HADOOP-12751?focusedCommentId=15239016&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15239016]).
So it seems to me that it would be worthwhile to fix this issue.
Ping [~templedf], [~steve_l], [~daryn] who have been involved in previous
efforts in this area.
> 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
>
> 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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