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    java.lang.NullPointerException
        at org.apache.hadoop.security.SecurityUtil.setTokenService(SecurityUtil.java:246)
        at org.apache.hadoop.hdfs.DFSClient.getDelegationToken(DFSClient.java:408)
        at org.apache.hadoop.hdfs.DistributedFileSystem.getDelegationToken(DistributedFileSystem.java:571)
        at azkaban.security.HadoopSecurityManager_H_1_0$2.getToken(HadoopSecurityManager_H_1_0.java:268)
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