Steve Vaughan created HDFS-16686:
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             Summary: GetJournalEditServlet fails to authorize valid Kerberos 
request
                 Key: HDFS-16686
                 URL: https://issues.apache.org/jira/browse/HDFS-16686
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: journal-node
         Environment: Running in Kubernetes using Java 11 in an HA 
configuration.  JournalNodes run on separate pods and have their own Kerberos 
principal "jn/<hostname>@<realm>".
            Reporter: Steve Vaughan


GetJournalEditServlet uses request.getRemoteuser() to determine the 
remoteShortName for Kerberos authorization, which fails to match when the 
JournalNode uses its own Kerberos principal (e.g. jn/<hostname>@<realm>).

This can be fixed by using the UserGroupInformation provided by the base 
DfsServlet class using the getUGI(request, conf) call.



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