I am using a Kerberized cluster for CDSW. When launching spark2-shell from a terminal, the shell launches fine. However, when I launch a workbench session in CDSW (using Scala engine kernel), I get the following exception. I have already selected to use Kerberos in ths CDSW settings for "Hadoop Authentication". Please let me know what  I am missing. Thanks.   ==   Exception in thread "main" org.apache.hadoop.security.AccessControlException: SIMPLE authentication is not enabled. Available:[TOKEN, KERBEROS] at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at org.apache.hadoop.yarn.ipc.RPCUtil.instantiateException(RPCUtil.java:53) at org.apache.hadoop.yarn.ipc.RPCUtil.unwrapAndThrowException(RPCUtil.java:104) at org.apache.hadoop.yarn.api.impl.pb.client.ApplicationClientProtocolPBClientImpl.getNewApplication(ApplicationClientProtocolPBClientImpl.java:220) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:258) at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:104) at com.sun.proxy.$Proxy22.getNewApplication(Unknown Source) at org.apache.hadoop.yarn.client.api.impl.YarnClientImpl.getNewApplication(YarnClientImpl.java:206) at org.apache.hadoop.yarn.client.api.impl.YarnClientImpl.createApplication(YarnClientImpl.java:214) at org.apache.spark.deploy.yarn.Client.submitApplication(Client.scala:161) at org.apache.spark.scheduler.cluster.YarnClientSchedulerBackend.start(YarnClientSchedulerBackend.scala:56) at org.apache.spark.scheduler.TaskSchedulerImpl.start(TaskSchedulerImpl.scala:165) at org.apache.spark.SparkContext.<init>(SparkContext.scala:512) at org.apache.spark.SparkContext$.getOrCreate(SparkContext.scala:2511) at org.apache.spark.sql.SparkSession$Builder$$anonfun$6.apply(SparkSession.scala:909) at org.apache.spark.sql.SparkSession$Builder$$anonfun$6.apply(SparkSession.scala:901) at scala.Option.getOrElse(Option.scala:121) at org.apache.spark.sql.SparkSession$Builder.getOrCreate(SparkSession.scala:901) at org.apache.toree.kernel.api.Kernel.createSparkContext(Kernel.scala:354) at org.apache.toree.kernel.api.Kernel.createSparkContext(Kernel.scala:373) at org.apache.toree.boot.layer.StandardComponentInitialization$class.initializeSparkContext(ComponentInitialization.scala:103) at org.apache.toree.Main$$anon$1.initializeSparkContext(Main.scala:35) at org.apache.toree.boot.layer.StandardComponentInitialization$class.initializeComponents(ComponentInitialization.scala:86) at org.apache.toree.Main$$anon$1.initializeComponents(Main.scala:35) at org.apache.toree.boot.KernelBootstrap.initialize(KernelBootstrap.scala:100) at org.apache.toree.Main$.delayedEndpoint$org$apache$toree$Main$1(Main.scala:40) at org.apache.toree.Main$delayedInit$body.apply(Main.scala:24) at scala.Function0$class.apply$mcV$sp(Function0.scala:34) at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12) at scala.App$$anonfun$main$1.apply(App.scala:76) at scala.App$$anonfun$main$1.apply(App.scala:76) at scala.collection.immutable.List.foreach(List.scala:381) at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35) at scala.App$class.main(App.scala:76) at org.apache.toree.Main$.main(Main.scala:24) at org.apache.toree.Main.main(Main.scala) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:755) at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:180) at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:205) at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:119) at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)         ... View more