Daryn Sharp created HADOOP-9317:
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             Summary: User cannot specify a kerberos keytab for commands
                 Key: HADOOP-9317
                 URL: https://issues.apache.org/jira/browse/HADOOP-9317
             Project: Hadoop Common
          Issue Type: Bug
          Components: security
    Affects Versions: 2.0.0-alpha, 0.23.0, 3.0.0
            Reporter: Daryn Sharp
            Assignee: Daryn Sharp
            Priority: Critical


{{UserGroupInformation}} only allows kerberos users to be logged in via the 
ticket cache when running hadoop commands.  {{UGI}} allows a keytab to be used, 
but it's only exposed programatically.  This forces keytab-based users running 
hadoop commands to periodically issue a kinit from the keytab.  A race 
condition exists during the kinit when the ticket cache is deleted and 
re-created.  Hadoop commands will fail when the ticket cache does not 
momentarily exist.

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