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https://issues.apache.org/jira/browse/HADOOP-13081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15392755#comment-15392755
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Chris Nauroth commented on HADOOP-13081:
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Hello [~sershe]. Some feedback on the current patch:
# On 6/11, I commented asking if it's feasible to add a unit test to
{{TestUserGroupInformation}}. What are your thoughts?
# FindBugs flagged that it's a method named {{clone}}, but it doesn't implement
{{Cloneable}} and doesn't follow the traditional recipe for a {{clone}} method
(e.g. calling the superclass). Maybe rename the method to something like
{{copySubject}}?
# Could you add to the JavaDocs describing the intent of this method? You
could describe how it supports adding different credentials to different UGI
instances without forcing them all to re-authenticate through Kerberos.
# Checkstyle flagged that there were a few lines longer than 80 characters.
> add the ability to create multiple UGIs/subjects from one kerberos login
> ------------------------------------------------------------------------
>
> Key: HADOOP-13081
> URL: https://issues.apache.org/jira/browse/HADOOP-13081
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HADOOP-13081.01.patch, HADOOP-13081.patch
>
>
> We have a scenario where we log in with kerberos as a certain user for some
> tasks, but also want to add tokens to the resulting UGI that would be
> specific to each task. We don't want to authenticate with kerberos for every
> task.
> I am not sure how this can be accomplished with the existing UGI interface.
> Perhaps some clone method would be helpful, similar to createProxyUser minus
> the proxy stuff; or it could just relogin anew from ticket cache.
> getUGIFromTicketCache seems like the best option in existing code, but there
> doesn't appear to be a consistent way of handling ticket cache location - the
> above method, that I only see called in test, is using a config setting that
> is not used anywhere else, and the env variable for the location that is used
> in the main ticket cache related methods is not set uniformly on all paths -
> therefore, trying to find the correct ticket cache and passing it via the
> config setting to getUGIFromTicketCache seems even hackier than doing the
> clone via reflection ;) Moreover, getUGIFromTicketCache ignores the user
> parameter on the main path - it logs a warning for multiple principals and
> then logs in with first available.
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