1.查看HDFS下目录结构及文件
dream361@ubuntu:~$ hdfs dfs -ls -R /
2.创建文件目录/tmp
dream361@ubuntu:~$ hdfs dfs -mkdir /tmp
3.复制当前目录下a.txts到HDFS文件系统
dream361@ubuntu:~$ hdfs dfs -put a.txt /inputFile
4.列出/tmp目录
dream361@ubuntu:~$ hdfs dfs -ls /tmp
5.查看/inputFile/a.txt文件内容
dream361@ubuntu:~$ hdfs dfs -cat /inputFile/a.txt Not Support zh_CN.UTF- cannot output Chinese LANGUAGE
6.删除/tmp目录
dream361@ubuntu:~$ hdfs dfs -rm /tmp rm: `/tmp': Is a directory dream361@ubuntu:~$ hdfs dfs -rm -r /tmp // :: INFO fs.TrashPolicyDefault: Namenode trash configuration: Deletion interval = minutes, Emptier interval = minutes. Deleted /tmp
7.查看HDFS状态
dream361@ubuntu:~$ hdfs dfsadmin -report Configured Capacity: (13.66 GB) Present Capacity: (7.01 GB) DFS Remaining: (7.01 GB) DFS Used: ( KB) DFS Used%: 0.00% Under replicated blocks: Blocks with corrupt replicas: Missing blocks: Missing blocks (with replication factor ): ------------------------------------------------- Live datanodes (): Name: (localhost) Hostname: localhost Decommission Status : Normal Configured Capacity: (13.66 GB) DFS Used: ( KB) Non DFS Used: (6.64 GB) DFS Remaining: (7.01 GB) DFS Used%: 0.00% DFS Remaining%: 51.36% Configured Cache Capacity: ( B) Cache Used: ( B) Cache Remaining: ( B) Cache Used%: 100.00% Cache Remaining%: 0.00% Xceivers: Last contact: Sat Feb :: PST
8.离开或进入安全模式
dream361@ubuntu:~$ hdfs dfsadmin -safemode leave Safe mode is OFF dream361@ubuntu:~$ hdfs dfsadmin -safemode enter Safe mode is ON