Steve Loughran created HADOOP-13627:
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             Summary: Have an explicit KerberosAuthException for UGI to throw, 
text from public constants
                 Key: HADOOP-13627
                 URL: https://issues.apache.org/jira/browse/HADOOP-13627
             Project: Hadoop Common
          Issue Type: Sub-task
          Components: security
    Affects Versions: 2.7.3
            Reporter: Steve Loughran
            Assignee: Xiao Chen


UGI creates simple IOEs on failure, making it impossible to catch them, ignore 
them, have smart retry logic around them, etc.

# Have an explicit exception like {{KerberosAuthException extends IOException}} 
to raise instead. We can't use {{AuthenticationException}} as that doesn't 
extend IOE.
# move {{UGI}}, {{SecurityUtil}} and things related off simple IOEs and into 
the new one
# review exceptions raised and consider if they can provide more information
# for the strings that get created, put them as public static constants, so 
that tests can look for them explicitly —tests that don't break if the text is 
changed.
# maybe, {{getUGIFromTicketCache}} to throw this rather than an RTE if no login 
principals were found (it throws IOEs on login failures, after all)
# keep KDiag in sync with this



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