Guard against NPE when calling UGI.isLoginKeytabBased()
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Key: HADOOP-6912
URL: https://issues.apache.org/jira/browse/HADOOP-6912
Project: Hadoop Common
Issue Type: Bug
Components: security
Reporter: Kan Zhang
Assignee: Kan Zhang
NPE can happen when isLoginKeytabBased() is called before a login is performed. See MAPREDUCE-1992
for an example.
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