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https://issues.apache.org/jira/browse/HADOOP-8152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13250168#comment-13250168
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Aaron T. Myers commented on HADOOP-8152:
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bq. The basic problem is that the UGI code assumes there is only one keytab in
play so when there are two or more, calling reloginFromKeytab (amongst other
routines) can have unpredictable results.
Makes sense. Thanks for the explanation. Would you mind filing a JIRA
describing the issue? Even if you don't intend to work on it, having the
problem described will be helpful to facilitate discussion.
bq. What we've been hypothesizing is changing it such that it requires saying
which keytab you actually want to relogin from... which means there is a good
chance that backward compatibility isn't going to be possible.
Sounds like backward compatibility could perhaps be achieved for the
single-keytab case by retaining the no-arg routines, checking how many keytabs
are in play, and throwing an error if a no-arg routine is called when there's
more than one keytab.
> Expand public APIs for security library classes
> -----------------------------------------------
>
> Key: HADOOP-8152
> URL: https://issues.apache.org/jira/browse/HADOOP-8152
> Project: Hadoop Common
> Issue Type: Improvement
> Components: security
> Affects Versions: 2.0.0
> Reporter: Aaron T. Myers
> Assignee: Aaron T. Myers
> Attachments: HADOOP-8152.patch, HADOOP-8152.patch
>
>
> Currently projects like Hive and HBase use UserGroupInformation and
> SecurityUtil methods. Both of these classes are marked
> LimitedPrivate(HDFS,MR) but should probably be marked more generally public.
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