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https://issues.apache.org/jira/browse/HADOOP-9070?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13554460#comment-13554460
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Daryn Sharp commented on HADOOP-9070:
-------------------------------------

Yes, I believe HADOOP-8999 is where the change (or bulk of it) was made.  My 
memory is fuzzy, but I think there was an existing case where a malformed 
protobuf exception was generated when the client wasn't reading a final 
response.  The change is largely intended to support PLAIN and/or other future 
SASL mechanisms, but it's definitely a bug that the client and server cannot be 
sure that SASL has completed.
                
> Kerberos SASL server cannot find kerberos key
> ---------------------------------------------
>
>                 Key: HADOOP-9070
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9070
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ipc
>    Affects Versions: 3.0.0, 2.0.3-alpha
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Blocker
>             Fix For: 2.0.3-alpha
>
>         Attachments: HADOOP-9070.patch, HADOOP-9070.patch, HADOOP-9070.patch
>
>
> HADOOP-9015 inadvertently removed a {{doAs}} block around instantiation of 
> the sasl server which renders a server incapable of accepting kerberized 
> connections.

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