Github user herval commented on the pull request:
https://github.com/apache/zeppelin/commit/e1f0a3205eb5aede0b2d80c9d3de59b3f47b699c#commitcomment-23016062
This caused a regression:
https://github.com/apache/zeppelin/blame/master/jdbc/src/main/java/org/apache/zeppelin/jdbc/JDBCInterpreter.java#L212
Leads to:
```
java.lang.NoClassDefFoundError:
org/apache/hadoop/security/UserGroupInformation$AuthenticationMethod
at
org.apache.zeppelin.jdbc.security.JDBCSecurityImpl.getAuthtype(JDBCSecurityImpl.java:64)
at
org.apache.zeppelin.jdbc.JDBCInterpreter.isKerboseEnabled(JDBCInterpreter.java:213)
at
org.apache.zeppelin.interpreter.KerberosInterpreter.open(KerberosInterpreter.java:64)
at
org.apache.zeppelin.jdbc.JDBCInterpreter.open(JDBCInterpreter.java:173)
at
org.apache.zeppelin.interpreter.LazyOpenInterpreter.open(LazyOpenInterpreter.java:69)
at
org.apache.zeppelin.interpreter.remote.RemoteInterpreterServer$InterpretJob.jobRun(RemoteInterpreterServer.java:499)
at org.apache.zeppelin.scheduler.Job.run(Job.java:181)
at
org.apache.zeppelin.scheduler.ParallelScheduler$JobRunner.run(ParallelScheduler.java:162)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
```
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