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azkaban.security.commons.HadoopSecurityManagerException: Failed to get hadoop tokens! nullnull	at azkaban.security.HadoopSecurityManager_H_1_0.prefetchToken(HadoopSecurityManager_H_1_0.java:318)	at azkaban.jobtype.HadoopPigJob.getHadoopTokens(HadoopPigJob.java:166)	at azkaban.jobtype.HadoopPigJob.run(HadoopPigJob.java:102)	at azkaban.execapp.JobRunner.runJob(JobRunner.java:379)	at azkaban.execapp.JobRunner.run(JobRunner.java:280)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)	at java.util.concurrent.FutureTask.run(FutureTask.java:138)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)	at java.lang.Thread.run(Thread.java:662)