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https://issues.apache.org/jira/browse/HADOOP-13627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15511291#comment-15511291
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Xiao Chen commented on HADOOP-13627:
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Thanks again for creating this Steve. Pasting your comment earlier:
bq. Bear in mind we are all scared of the code and changes breaking things; 
keep the diffs minimal, and don't change the text messages we have today. Not 
because they are good, but because they are searchable in existing JIRAs and 
Stack Overflow topics

> 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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