Viraj Jasani created HADOOP-16672:

             Summary: missing null check for UserGroupInformation while during 
IOSteam setup
                 Key: HADOOP-16672
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 3.3.0
            Reporter: Viraj Jasani

While setting up IOStreams, we might end up with NPE if UserGroupInformation is 
null resulting from getTicket() call. Similar to other operations, we should 
add null check for ticket.doAs() call.

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