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https://issues.apache.org/jira/browse/HADOOP-13081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15507759#comment-15507759
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Sergey Shelukhin commented on HADOOP-13081:
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[~cnauroth] the concrete use case is where a service runs multiple pieces of
work on behalf of users; it can be set to log in as a particular user using
Kerberos, but the users can also add their own tokens.
We cannot add tokens to a single kerberos-based UGI because they will all mix;
we also cannot log in for every piece of work in most cases, as it would
overload the KDC.
Ideally, we should be able to reuse the kerberos login and create a separate
UGI with it for each user, adding the user-specific tokens.
> 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: Improvement
> Components: security
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Fix For: 2.8.0, 3.0.0-alpha1
>
> Attachments: HADOOP-13081.01.patch, HADOOP-13081.02.patch,
> HADOOP-13081.02.patch, HADOOP-13081.03.patch, HADOOP-13081.03.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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