hdfs会为每一个用户创建一个回收站目录:/usr用户名/.Trash/,每一个用户在Shell命令行删除的文件/目录，会进入到对应的回收站目录中，在回收站中的数据都有一个生命周期，也就是说当回收站中的文件/目录在一段时间之内没有被用户恢复的话，HDFS就会自动将这个文件/目录彻底删除。
默认情况下hdfs的回收站是不开启的，需要通过配置来开启，位置core-site.xml,配置如下，value的单位是分钟，1440分钟代表的是一天的生命周期
<property>
<name>fs.trash.interval</name>
<value>1440</value>
</property>
1440代表的是一天。24*60=1440
修改配置需同步集群中其他节点信息，并重启集群
重启集群后尝试删除REDADME.txt文件[root@bigdata02 hadoop]# hdfs dfs -rm /README.txt 2021-04-03 10:56:08,152 INFO fs.TrashPolicyDefault: Moved: 'hdfs://bigdata02:9000/README.txt' to trash at: hdfs://bigdata02:9000/user/root/.Trash/Current/README.txt [root@bigdata02 hadoop]# hdfs dfs -ls /user/root/.Trash/Current Found 2 items -rw-r--r-- 2 root supergroup 1361 2021-04-03 10:14 /user/root/.Trash/Current/README.txt -rw-r--r-- 2 root supergroup 345625475 2021-04-03 09:53 /user/root/.Trash/Current/hadoop-3.2.0.tar.gz [root@bigdata02 hadoop]# hdfs dfs -rm -r /user/root/.Trash/Current/Current/hadoop-3.2.0.tar.gz rm: `/user/root/.Trash/Current/Current/hadoop-3.2.0.tar.gz': No such file or directory[root@bigdata02 hadoop]# hdfs dfs -rm -r -skipTrash /hadoop-3.2.0.tar.gz Deleted /hadoop-3.2.0.tar.gzHDFS安全模式
集群刚启动时HDFS会进入安全模式，此时无法执行操作。
[root@bigdata02 hadoop]# hdfs dfs -rm /README.txt 2021-04-03 10:55:41,520 WARN fs.TrashPolicyDefault: Can't create trash directory: hdfs://bigdata02:9000/user/root/.Trash/Current org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot create directory /user/root/.Trash/Current. Name node is in safe mode. The reported blocks 4 has reached the threshold 0.9990 of total blocks 4. The number of live datanodes 2 has reached the minimum number 0. In safe mode extension. Safe mode will be turned off automatically in 1 seconds. NamenodeHostName:bigdata02 at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.newSafemodeException(FSNamesystem.java:1469) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkNameNodeSafeMode(FSNamesystem.java:1456) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirs(FSNamesystem.java:3214) at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.mkdirs(NameNodeRpcServer.java:1127) at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.mkdirs(ClientNamenodeProtocolServerSideTranslatorPB.java:713) at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java) at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:524) at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1025) at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:876) at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:822) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:422) at org.apache.hadoop.security.UserGroup@R_772_404[email protected](UserGroup@R_772_404[email protected]:1730) at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2682)
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:121)
at org.apache.hadoop.ipc.remoteexception.unwrapremoteexception(remoteexception.java:88)
at org.apache.hadoop.hdfs.DFSClient.primitiveMkdir(DFSClient.java:2426)
at org.apache.hadoop.hdfs.DFSClient.mkdirs(DFSClient.java:2400)
at org.apache.hadoop.hdfs.distributedFileSystem$27.doCall(distributedFileSystem.java:1324)
at org.apache.hadoop.hdfs.distributedFileSystem$27.doCall(distributedFileSystem.java:1321)
at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
at org.apache.hadoop.hdfs.distributedFileSystem.mkdirsInternal(distributedFileSystem.java:1338)
at org.apache.hadoop.hdfs.distributedFileSystem.mkdirs(distributedFileSystem.java:1313)
at org.apache.hadoop.fs.TrashPolicyDefault.movetoTrash(TrashPolicyDefault.java:153)
at org.apache.hadoop.fs.Trash.movetoTrash(Trash.java:110)
at org.apache.hadoop.fs.Trash.movetoAppropriateTrash(Trash.java:96)
at org.apache.hadoop.fs.shell.Delete$Rm.movetoTrash(Delete.java:153)
at org.apache.hadoop.fs.shell.Delete$Rm.processpath(Delete.java:118)
at org.apache.hadoop.fs.shell.Command.processpathInternal(Command.java:367)
at org.apache.hadoop.fs.shell.Command.processpaths(Command.java:331)
at org.apache.hadoop.fs.shell.Command.processpathArgument(Command.java:304)
at org.apache.hadoop.fs.shell.Command.processArgument(Command.java:286)
at org.apache.hadoop.fs.shell.Command.processArguments(Command.java:270)
at org.apache.hadoop.fs.shell.FsCommand.processRawArguments(FsCommand.java:120)
at org.apache.hadoop.fs.shell.Command.run(Command.java:177)
at org.apache.hadoop.fs.FsShell.run(FsShell.java:327)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:90)
at org.apache.hadoop.fs.FsShell.main(FsShell.java:390)
Caused by: org.apache.hadoop.ipc.remoteexception(org.apache.hadoop.hdfs.server.namenode.SafeModeException): Cannot create directory /user/root/.Trash/Current. Name node is in safe mode.
The reported blocks 4 has reached the threshold 0.9990 of total blocks 4. The number of live datanodes 2 has reached the minimum number 0. In safe mode extension. Safe mode will be turned off automatically in 1 seconds. NamenodeHostName:bigdata02
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.newSafemodeException(FSNamesystem.java:1469)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkNameNodeSafeMode(FSNamesystem.java:1456)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirs(FSNamesystem.java:3214)
at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.mkdirs(NameNodeRpcServer.java:1127)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.mkdirs(ClientNamenodeProtocolServerSideTranslatorPB.java:713)
at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos\(ClientNamenodeProtocol\)2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
at org.apache.hadoop.ipc.ProtobufRpcEngine\(Server\)ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:524)
at org.apache.hadoop.ipc.RPC\(Server.call(RPC.java:1025)
at org.apache.hadoop.ipc.Server\)RpcCall.run(Server.java:876)
at org.apache.hadoop.ipc.Server\(RpcCall.run(Server.java:822)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroup@R_772_404[email protected](UserGroup@R_772_404[email protected]:1730)
at org.apache.hadoop.ipc.Server\)Handler.run(Server.java:2682)
at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1511)
at org.apache.hadoop.ipc.Client.call(Client.java:1457)
at org.apache.hadoop.ipc.Client.call(Client.java:1367)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:228)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:116)
at com.sun.proxy.$Proxy9.mkdirs(UnkNown Source)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.mkdirs(ClientNamenodeProtocolTranslatorPB.java:656)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:422)
at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:165)
at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:157)
at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:95)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:359)
at com.sun.proxy.$Proxy10.mkdirs(UnkNown Source)
at org.apache.hadoop.hdfs.DFSClient.primitiveMkdir(DFSClient.java:2424)
... 22 more
rm: Failed to move to trash: hdfs://bigdata02:9000/README.txt: Cannot create directory /user/root/.Trash/Current. Name node is in safe mode.
[root@bigdata02 hadoop]# hdfs dfs -rm /README.txt
2021-04-03 10:56:08,152 INFO fs.TrashPolicyDefault: Moved: 'hdfs://bigdata02:9000/README.txt' to trash at: hdfs://bigdata02:9000/user/root/.Trash/Current/README.txt
查看安全模式
[root@bigdata02 hadoop]# hdfs dfsadmin -safemode get
Safe mode is OFF
离开安全模式
[root@bigdata02 hadoop]# hdfs dfsadmin -safemode leave
Safe mode is OFF
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