HDFS常用命令整理
简介:
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- HDFS 文件系统提供了相当多的shell 操作命令,大大方便了程序员和系统管理人员查看、修改HDFS 上的文件。进一步,HDFS 的操作命令和Unix/Linux 的命令名称和格式相当一致,因而学习HDFS 命令的成本也大为缩小。
1.命令帮助
[hadoop@hadoop000 ~]$ hdfs dfs
Usage: hadoop fs [generic options]
[-appendToFile ... ]
[-cat [-ignoreCrc] ...]
[-checksum ...]
[-chgrp [-R] GROUP PATH...]
[-chmod [-R] PATH...]
[-chown [-R] [OWNER][:[GROUP]] PATH...]
[-copyFromLocal [-f] [-p] [-l] [-d] ... ]
[-copyToLocal [-f] [-p] [-ignoreCrc] [-crc] ... ]
[-count [-q] [-h] [-v] [-t []] [-u] [-x] ...]
[-cp [-f] [-p | -p[topax]] [-d] ... ]
[-createSnapshot []]
[-deleteSnapshot ]
[-df [-h] [ ...]]
[-du [-s] [-h] [-x] ...]
[-expunge]
[-find ... ...]
[-get [-f] [-p] [-ignoreCrc] [-crc] ... ]
[-getfacl [-R] ]
[-getfattr [-R] {-n name | -d} [-e en] ]
[-getmerge [-nl] [-skip-empty-file] ]
[-help [cmd ...]]
[-ls [-C] [-d] [-h] [-q] [-R] [-t] [-S] [-r] [-u] [ ...]]
[-mkdir [-p] ...]
[-moveFromLocal ... ]
[-moveToLocal ]
[-mv ... ]
[-put [-f] [-p] [-l] [-d] ... ]
[-renameSnapshot ]
[-rm [-f] [-r|-R] [-skipTrash] [-safely] ...]
[-rmdir [--ignore-fail-on-non-empty] ...]
[-setfacl [-R] [{-b|-k} {-m|-x } ]|[--set ]]
[-setfattr {-n name [-v value] | -x name} ]
[-setrep [-R] [-w] ...]
[-stat [format] ...]
[-tail [-f] ]
[-test -[defsz] ]
[-text [-ignoreCrc] ...]
[-touchz ...]
[-truncate [-w] ...]
[-usage [cmd ...]]
# 注:hdfs dfs等同于hadoop fs
2.文件操作命令案例
hdfs dfs -copyFromLocal /local/data /hdfs/data:将本地文件上传到 hdfs 上(原路径只能是一个文件)
hdfs dfs -put /tmp/ /hdfs/ :和 copyFromLocal 区别是,put 原路径可以是文件夹等
hadoop fs -ls / :查看根目录文件
hadoop fs -ls /tmp/data:查看/tmp/data目录
hadoop fs -cat /tmp/a.txt :查看 a.txt,与 -text 一样
hadoop fs -mkdir dir:创建目录dir
hadoop fs -get /aaa/jdk.tar.gz :等同于copyToLocal,就是从hdfs下载文件到本地
hadoop fs -df -h / :统计文件系统的可用空间信息
hadoop fs -cp /aaa/jdk.tar.gz /bbb/jdk.tar.gz.2 :从hdfs的一个路径拷贝hdfs的另一个路径
hadoop fs -mv /aaa/jdk.tar.gz / :在hdfs目录中移动文件
hadoop fs -du -s -h /aaa/* :统计文件夹的大小信息
hadoop fs -rm -r /aaa/bbb/ :删除文件或文件夹
hadoop fs -rmdir /aaa/bbb/ccc :删除目录
hadoop fs -tail /weblog/access_log.1 :显示一个文件的末尾
3.管理命令
# 命令帮助
[hadoop@hadoop000 ~]$ hdfs dfsadmin
Usage: hdfs dfsadmin
Note: Administrative commands can only be run as the HDFS superuser.
[-report [-live] [-dead] [-decommissioning]]
[-safemode ]
[-saveNamespace]
[-rollEdits]
[-restoreFailedStorage true|false|check]
[-refreshNodes]
[-setQuota ...]
[-clrQuota ...]
[-setSpaceQuota [-storageType ] ...]
[-clrSpaceQuota [-storageType ] ...]
[-finalizeUpgrade]
[-rollingUpgrade []]
[-refreshServiceAcl]
[-refreshUserToGroupsMappings]
[-refreshSuperUserGroupsConfiguration]
[-refreshCallQueue]
[-refresh [arg1..argn]
[-reconfig ]
[-printTopology]
[-refreshNamenodes datanode_host:ipc_port]
[-deleteBlockPool datanode_host:ipc_port blockpoolId [force]]
[-setBalancerBandwidth ]
[-getBalancerBandwidth ]
[-fetchImage ]
[-allowSnapshot ]
[-disallowSnapshot ]
[-shutdownDatanode [upgrade]]
[-evictWriters ]
[-getDatanodeInfo ]
[-metasave filename]
[-triggerBlockReport [-incremental] ]
[-help [cmd]]
hdfs dfsadmin -report :显示所有dataNode
hdfs dfsadmin -safemode leave :离开安全模式
文章题目:HDFS常用命令整理
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