Hadoop操作命令
查看所有命令：hdfs dfs
查看目錄：hdfs dfs -ls /
查看目錄及子目錄：hdfs dfs -ls -R /
創建文件夾：hdfs dfs -mkdir /HDFS目錄
刪除目錄和子目錄：hdfs dfs -rmr /HDFS目錄
上傳：hdfs dfs -put 本地路徑 HDFS目錄
從本地複製：hdfs dfs -copyFromLocal 本地路徑 /HDFS目錄
從本地剪切：hdfs dfs -moveFromLocal 本地路徑 /HDFS目錄
下載：hdfs dfs -get /HDFS目錄 本地路徑
合併：hdfs dfs -getmerge /HDFS目錄 本地路徑
計數，顯示文件夾、文件個數、文件總的大小：hdfs dfs -count /HDFS目錄
顯示文件夾和每個文件大小：hdfs dfs -du /HDFS目錄
實現datanode數據存儲均衡：hdfs balancer
目錄和文件名支持*通配符
附全部命令：
[-appendToFile <localsrc> ... <dst>]
[-cat [-ignoreCrc] <src> ...]
[-checksum <src> ...]
[-chgrp [-R] GROUP PATH...]
[-chmod [-R] <MODE[,MODE]... | OCTALMODE> PATH...]
[-chown [-R] [OWNER][:[GROUP]] PATH...]
[-copyFromLocal [-f] [-p] [-l] <localsrc> ... <dst>]
[-copyToLocal [-p] [-ignoreCrc] [-crc] <src> ... <localdst>]
[-count [-q] [-h] <path> ...]
[-cp [-f] [-p | -p[topax]] <src> ... <dst>]
[-createSnapshot <snapshotDir> [<snapshotName>]]
[-deleteSnapshot <snapshotDir> <snapshotName>]
[-df [-h] [<path> ...]]
[-du [-s] [-h] <path> ...]
[-expunge]
[-find <path> ... <expression> ...]
[-get [-p] [-ignoreCrc] [-crc] <src> ... <localdst>]
[-getfacl [-R] <path>]
[-getfattr [-R] {-n name | -d} [-e en] <path>]
[-getmerge [-nl] <src> <localdst>]
[-help [cmd ...]]
[-ls [-d] [-h] [-R] [<path> ...]]
[-mkdir [-p] <path> ...]
[-moveFromLocal <localsrc> ... <dst>]
[-moveToLocal <src> <localdst>]
[-mv <src> ... <dst>]
[-put [-f] [-p] [-l] <localsrc> ... <dst>]
[-renameSnapshot <snapshotDir> <oldName> <newName>]
[-rm [-f] [-r|-R] [-skipTrash] <src> ...]
[-rmdir [--ignore-fail-on-non-empty] <dir> ...]
[-setfacl [-R] [{-b|-k} {-m|-x <acl_spec>} <path>]|[--set <acl_spec> <path>]]
[-setfattr {-n name [-v value] | -x name} <path>]
[-setrep [-R] [-w] <rep> <path> ...]
[-stat [format] <path> ...]
[-tail [-f] <file>]
[-test -[defsz] <path>]
[-text [-ignoreCrc] <src> ...]
[-touchz <path> ...]
[-truncate [-w] <length> <path> ...]
[-usage [cmd ...]]
Hadoop管理員命令
查看所有命令：hdfs dfsadmin
打印報告：hdfs dfsadmin -report
獲取當前安全模式狀態：hdfs dfsadmin -safemode get
手動進入安全模式：hdfs dfsadmin -safemode enter
手動離開安全模式：hdfs dfsadmin -safemode leave
快照命令：
使用快照：hdfs dfsadmin -allowSnapshot 快照目錄
禁用快照：hdfs dfsadmin -disallowSnapshot 快照目錄
Quota 配額：
名稱配額 數量
[-setQuota <quota> <dirname>...<dirname>]
[-clrQuota <dirname>...<dirname>]
空間配額 空間大小
[-setSpaceQuota <quota> [-storageType <storagetype>] <dirname>...<dirname>]
[-clrSpaceQuota [-storageType <storagetype>] <dirname>...<dirname>]
附全部命令：
[-report [-live] [-dead] [-decommissioning]]
[-safemode <enter | leave | get | wait>]
[-saveNamespace]
[-rollEdits]
[-restoreFailedStorage true|false|check]
[-refreshNodes]
[-setQuota <quota> <dirname>...<dirname>]
[-clrQuota <dirname>...<dirname>]
[-setSpaceQuota <quota> [-storageType <storagetype>] <dirname>...<dirname>]
[-clrSpaceQuota [-storageType <storagetype>] <dirname>...<dirname>]
[-finalizeUpgrade]
[-rollingUpgrade [<query|prepare|finalize>]]
[-refreshServiceAcl]
[-refreshUserToGroupsMappings]
[-refreshSuperUserGroupsConfiguration]
[-refreshCallQueue]
[-refresh <host:ipc_port> <key> [arg1..argn]
[-reconfig <datanode|...> <host:ipc_port> <start|status>]
[-printTopology]
[-refreshNamenodes datanode_host:ipc_port]
[-deleteBlockPool datanode_host:ipc_port blockpoolId [force]]
[-setBalancerBandwidth <bandwidth in bytes per second>]
[-fetchImage <local directory>]
[-allowSnapshot <snapshotDir>]
[-disallowSnapshot <snapshotDir>]
[-shutdownDatanode <datanode_host:ipc_port> [upgrade]]
[-getDatanodeInfo <datanode_host:ipc_port>]
[-metasave filename]
[-triggerBlockReport [-incremental] <datanode_host:ipc_port>]
