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https://issues.apache.org/jira/browse/HADOOP-9296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13639468#comment-13639468
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Daryn Sharp commented on HADOOP-9296:
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I really don't think a new authentication method is needed for this "feature",
nor should the client have do any special logic. There's nothing special that
warrants contortions on the client to do simple gssapi/kerberos.
The root cause is the client "guesses" the principal for a remote NN based on
the principal of its default NN. This causes a number of problems which also
manifests in your cross-realm trust environment. In HADOOP-9421 I've suggested
the NN should provide the service of the token it wants, as well as the service
principal. Why not leverage that to solve your no cross-realm trust problem?
Ie. Have the NN return the principal in the user's realm. In this scenario, no
client changes are required, and no special authentication method is required.
> Authenticating users from different realm without a trust relationship
> ----------------------------------------------------------------------
>
> Key: HADOOP-9296
> URL: https://issues.apache.org/jira/browse/HADOOP-9296
> Project: Hadoop Common
> Issue Type: Improvement
> Components: security
> Reporter: Benoy Antony
> Assignee: Benoy Antony
> Attachments: HADOOP-9296-1.1.patch, multirealm.pdf
>
>
> Hadoop Masters (JobTracker and NameNode) and slaves (Data Node and
> TaskTracker) are part of the Hadoop domain, controlled by Hadoop Active
> Directory.
> The users belong to the CORP domain, controlled by the CORP Active Directory.
> In the absence of a one way trust from HADOOP DOMAIN to CORP DOMAIN, how will
> Hadoop Servers (JobTracker, NameNode) authenticate CORP users ?
> The solution and implementation details are in the attachement
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