错误

log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Exception in thread "main" org.apache.hadoop.security.AccessControlException: Permission denied: user=12275, access=ALL, inode="/output":root:supergroup:drwxr-xr-xat org.apache.hadoop.hdfs.server.namenode.DefaultAuthorizationProvider.checkFsPermission(DefaultAuthorizationProvider.java:279)at org.apache.hadoop.hdfs.server.namenode.DefaultAuthorizationProvider.check(DefaultAuthorizationProvider.java:260)at org.apache.hadoop.hdfs.server.namenode.DefaultAuthorizationProvider.checkSubAccess(DefaultAuthorizationProvider.java:223)at org.apache.hadoop.hdfs.server.namenode.DefaultAuthorizationProvider.checkPermission(DefaultAuthorizationProvider.java:171)at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkPermission(FSPermissionChecker.java:152)at org.apache.hadoop.hdfs.server.namenode.FSDirectory.checkPermission(FSDirectory.java:3877)at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkPermission(FSNamesystem.java:6797)at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.deleteInternal(FSNamesystem.java:4231)at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.deleteInt(FSNamesystem.java:4186)at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.delete(FSNamesystem.java:4170)at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.delete(NameNodeRpcServer.java:854)at org.apache.hadoop.hdfs.server.namenode.AuthorizationProviderProxyClientProtocol.delete(AuthorizationProviderProxyClientProtocol.java:311)at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.delete(ClientNamenodeProtocolServerSideTranslatorPB.java:625)at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:617)at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1073)at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2281)at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2277)at java.security.AccessController.doPrivileged(Native Method)at javax.security.auth.Subject.doAs(Subject.java:422)at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1920)at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2275)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.ipc.RemoteException.instantiateException(RemoteException.java:106)at org.apache.hadoop.ipc.RemoteException.unwrapRemoteException(RemoteException.java:73)at org.apache.hadoop.hdfs.DFSClient.delete(DFSClient.java:1931)at org.apache.hadoop.hdfs.DistributedFileSystem$12.doCall(DistributedFileSystem.java:638)at org.apache.hadoop.hdfs.DistributedFileSystem$12.doCall(DistributedFileSystem.java:634)at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)at org.apache.hadoop.hdfs.DistributedFileSystem.delete(DistributedFileSystem.java:634)at nj.zb.demo1.WordCountDriver.main(WordCountDriver.java:40)
Caused by: org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.AccessControlException): Permission denied: user=12275, access=ALL, inode="/output":root:supergroup:drwxr-xr-xat org.apache.hadoop.hdfs.server.namenode.DefaultAuthorizationProvider.checkFsPermission(DefaultAuthorizationProvider.java:279)at org.apache.hadoop.hdfs.server.namenode.DefaultAuthorizationProvider.check(DefaultAuthorizationProvider.java:260)at org.apache.hadoop.hdfs.server.namenode.DefaultAuthorizationProvider.checkSubAccess(DefaultAuthorizationProvider.java:223)at org.apache.hadoop.hdfs.server.namenode.DefaultAuthorizationProvider.checkPermission(DefaultAuthorizationProvider.java:171)at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkPermission(FSPermissionChecker.java:152)at org.apache.hadoop.hdfs.server.namenode.FSDirectory.checkPermission(FSDirectory.java:3877)at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkPermission(FSNamesystem.java:6797)at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.deleteInternal(FSNamesystem.java:4231)at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.deleteInt(FSNamesystem.java:4186)at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.delete(FSNamesystem.java:4170)at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.delete(NameNodeRpcServer.java:854)at org.apache.hadoop.hdfs.server.namenode.AuthorizationProviderProxyClientProtocol.delete(AuthorizationProviderProxyClientProtocol.java:311)at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.delete(ClientNamenodeProtocolServerSideTranslatorPB.java:625)at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:617)at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1073)at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2281)at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2277)at java.security.AccessController.doPrivileged(Native Method)at javax.security.auth.Subject.doAs(Subject.java:422)at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1920)at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2275)at org.apache.hadoop.ipc.Client.call(Client.java:1468)at org.apache.hadoop.ipc.Client.call(Client.java:1399)at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:232)at com.sun.proxy.$Proxy9.delete(Unknown Source)at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.delete(ClientNamenodeProtocolTranslatorPB.java:521)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:187)at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)at com.sun.proxy.$Proxy10.delete(Unknown Source)at org.apache.hadoop.hdfs.DFSClient.delete(DFSClient.java:1929)... 5 moreProcess finished with exit code 1

原因：没有权限
解决方法

[root@mihaoyu151 opt]# hdfs dfs -ls /
21/10/27 15:47:46 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Found 3 items
drwxrwxrwx   - root supergroup          0 2021-10-27 18:23 /input
drwxr-xr-x   - root supergroup          0 2021-10-27 15:33 /output
drwxrwxrwx   - root supergroup          0 2021-10-27 18:04 /tmp
[root@mihaoyu151 opt]# hdfs dfs -chmod -R 777 /
21/10/27 15:48:01 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
[root@mihaoyu151 opt]# hdfs dfs -ls /
21/10/27 15:48:06 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Found 3 items
drwxrwxrwx   - root supergroup          0 2021-10-27 18:23 /input
drwxrwxrwx   - root supergroup          0 2021-10-27 15:33 /output
drwxrwxrwx   - root supergroup          0 2021-10-27 18:04 /tmp
[root@mihaoyu151 opt]# 

再次执行

成功