Hello Cloudera community,    Could you please help me about Yarn issue below ? I'm new in Hadoop and I don't know very well hadoop cluster. 21/01/04 11:21:41 INFO client.ConfiguredRMFailoverProxyProvider: Failing over to rm16 21/01/04 11:21:41 WARN security.UserGroupInformation: PriviledgedActionException as:user/server (auth:KERBEROS) cause:org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.token.SecretManager$InvalidToken): token (RM_DELEGATION_TOKEN owner=cabhbwg, renewer=yarn, realUser=user/server, issueDate=1608236528130, maxDate=1608841328130, sequenceNumber=288, masterKeyId=735) can't be found in cache 21/01/04 11:21:41 WARN ipc.Client: Exception encountered while connecting to the server : org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.token.SecretManager$InvalidToken): token (RM_DELEGATION_TOKEN owner=cabhbwg, renewer=yarn, realUser=user/server, issueDate=1608236528130, maxDate=1608841328130, sequenceNumber=288, masterKeyId=735) can't be found in cache 21/01/04 11:21:41 WARN security.UserGroupInformation: PriviledgedActionException as:user/server (auth:KERBEROS) cause:org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.token.SecretManager$InvalidToken): token (RM_DELEGATION_TOKEN owner=cabhbwg, renewer=yarn, realUser=user/server, issueDate=1608236528130, maxDate=1608841328130, sequenceNumber=288, masterKeyId=735) can't be found in cache Unable to get ApplicationState. Attempting to fetch logs directly from the filesystem. 21/01/04 11:21:41 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable 21/01/04 11:21:41 WARN shortcircuit.DomainSocketFactory: The short-circuit local reads feature cannot be used because libhadoop cannot be loaded. 21/01/04 11:21:41 WARN security.UserGroupInformation: PriviledgedActionException as:user/server (auth:KERBEROS) cause:org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.StandbyException): Operation category READ is not supported in state standby. Visit https://s.apache.org/sbnn-error 21/01/04 11:21:41 WARN ipc.Client: Exception encountered while connecting to the server : org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.StandbyException): Operation category READ is not supported in state standby. Visit https://s.apache.org/sbnn-error 21/01/04 11:21:41 WARN security.UserGroupInformation: PriviledgedActionException as:user/server (auth:KERBEROS) cause:org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.StandbyException): Operation category READ is not supported in state standby. Visit https://s.apache.org/sbnn-error 21/01/04 11:21:41 WARN security.UserGroupInformation: PriviledgedActionException as:user/server (auth:KERBEROS) cause:org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.token.SecretManager$InvalidToken): token (token for cabhbwg: HDFS_DELEGATION_TOKEN owner=cabhbwg, renewer=yarn, realUser=user/server, issueDate=1608236528002, maxDate=1608841328002, sequenceNumber=32002, masterKeyId=1523) can't be found in cache 21/01/04 11:21:41 WARN ipc.Client: Exception encountered while connecting to the server : org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.token.SecretManager$InvalidToken): token (token for cabhbwg: HDFS_DELEGATION_TOKEN owner=cabhbwg, renewer=yarn, realUser=user/server, issueDate=1608236528002, maxDate=1608841328002, sequenceNumber=32002, masterKeyId=1523) can't be found in cache 21/01/04 11:21:41 WARN security.UserGroupInformation: PriviledgedActionException as:user/server (auth:KERBEROS) cause:org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.token.SecretManager$InvalidToken): token (token for cabhbwg: HDFS_DELEGATION_TOKEN owner=cabhbwg, renewer=yarn, realUser=user/server, issueDate=1608236528002, maxDate=1608841328002, sequenceNumber=32002, masterKeyId=1523) can't be found in cache Exception in thread "main" org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.token.SecretManager$InvalidToken): token (token for cabhbwg: HDFS_DELEGATION_TOKEN owner=cabhbwg, renewer=yarn, realUser=user/server, issueDate=1608236528002, maxDate=1608841328002, sequenceNumber=32002, masterKeyId=1523) can't be found in cache at org.apache.hadoop.ipc.Client.call(Client.java:1504) at org.apache.hadoop.ipc.Client.call(Client.java:1441) at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:230) at com.sun.proxy.$Proxy15.getListing(Unknown Source) at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getListing(ClientNamenodeProtocolTranslatorPB.java:588) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:258) at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:104) at com.sun.proxy.$Proxy16.getListing(Unknown Source) at org.apache.hadoop.hdfs.DFSClient.listPaths(DFSClient.java:2145) at org.apache.hadoop.fs.Hdfs$DirListingIterator.<init>(Hdfs.java:211) at org.apache.hadoop.fs.Hdfs$DirListingIterator.<init>(Hdfs.java:198) at org.apache.hadoop.fs.Hdfs$2.<init>(Hdfs.java:180) at org.apache.hadoop.fs.Hdfs.listStatusIterator(Hdfs.java:180) at org.apache.hadoop.fs.FileContext$21.next(FileContext.java:1468) at org.apache.hadoop.fs.FileContext$21.next(FileContext.java:1463) at org.apache.hadoop.fs.FSLinkResolver.resolve(FSLinkResolver.java:90) at org.apache.hadoop.fs.FileContext.listStatus(FileContext.java:1463) at org.apache.hadoop.yarn.logaggregation.LogCLIHelpers.dumpAllContainersLogs(LogCLIHelpers.java:156) at org.apache.hadoop.yarn.client.cli.LogsCLI.run(LogsCLI.java:133) at org.apache.hadoop.yarn.client.cli.LogsCLI.main(LogsCLI.java:186)   Thank you very much in advance.  ... 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