1.卸载相应的Kerberos 组件：
centos/redhat:
yum remove krb5-libs krb5-workstation
或者(ubuntu)：
sudo apt-get remove krb5-user libpam-krb5 libpam-ccreds auth-client-config
2.查看自己本地$HADOOP_HOME/etc/hadoop ，$SPARK_HOME/conf ， $LIVY_HOME/conf，HIVE_HOME/conf 等软件下面配置文件目录是否存在 远程Kerberos 集群相关的配置 Hadoop相关的 core-site.xml,hdfs-site.xml等*.xml文件，全部进行删除。否则会报如下错误：
原因：SPARK_HOME/conf下面存在之前livy提交远程任务放置的hdfs-site.xml，core-site.xml等 *.xml文件，导致排查好久，重装系统仍未解决
解决方法：移除该目录的hdfs-site.xml，core-site.xml等 *.xml文件
py4j.protocol.Py4JJavaError: An error occurred while calling o76.getContentSummary.
: java.io.IOException: Failed on local exception: java.io.IOException: Server asks us to fall back to SIMPLE auth, but this client is configured to only allow secure connections.; Host Details : local host is: "jerry/10.111.23.70"; destination host is: "10.111.32.87":8020;
at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:776)
at org.apache.hadoop.ipc.Client.call(Client.java:1479)
at org.apache.hadoop.ipc.Client.call(Client.java:1412)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:229)
at com.sun.proxy.$Proxy17.getContentSummary(Unknown Source)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getContentSummary(ClientNamenodeProtocolTranslatorPB.java:801)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:191)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
at com.sun.proxy.$Proxy18.getContentSummary(Unknown Source)
at org.apache.hadoop.hdfs.DFSClient.getContentSummary(DFSClient.java:3026)
at org.apache.hadoop.hdfs.DistributedFileSystem$15.doCall(DistributedFileSystem.java:725)
at org.apache.hadoop.hdfs.DistributedFileSystem$15.doCall(DistributedFileSystem.java:721)
at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
at org.apache.hadoop.hdfs.DistributedFileSystem.getContentSummary(DistributedFileSystem.java:732)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)
at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
at py4j.Gateway.invoke(Gateway.java:282)
at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
at py4j.commands.CallCommand.execute(CallCommand.java:79)
at py4j.GatewayConnection.run(GatewayConnection.java:214)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.IOException: Server asks us to fall back to SIMPLE auth, but this client is configured to only allow secure connections.
at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:754)
at org.apache.hadoop.ipc.Client$Connection.access$2900(Client.java:375)
at org.apache.hadoop.ipc.Client.getConnection(Client.java:1528)
at org.apache.hadoop.ipc.Client.call(Client.java:1451)
