Hadoop之HDFS(概述和Shell操作)

HDFS

HDFS组成架构

HDFS文件块大小

HDFSShell）

1

bin/hadoop fs

dfsfs实现

2．命令

$ bin/hadoop fs  [-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] <localsrc> ... <dst>]         [-copyToLocal [-p] [-ignoreCrc] [-crc] <src> ... <localdst>]         [-count [-q] <path> ...]         [-cp [-f] [-p] <src> ... <dst>]         [-createSnapshot <snapshotDir> [<snapshotName>]]         [-deleteSnapshot <snapshotDir> <snapshotName>]         [-df [-h] [<path> ...]]         [-du [-s] [-h] <path> ...]         [-expunge]         [-get [-p] [-ignoreCrc] [-crc] <src> ... <localdst>]         [-getfacl [-R] <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] <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>]]         [-setrep [-R] [-w] <rep> <path> ...]         [-stat [format] <path> ...]         [-tail [-f] <file>]         [-test -[defsz] <path>]         [-text [-ignoreCrc] <src> ...]         [-touchz <path> ...]         [-usage [cmd ...]]

3实操

0Hadoop

$ sbin/start-dfs.sh $ sbin/start-yarn.sh

1-help

$ hadoop fs -help rm

2-ls:

$ hadoop fs -ls /

3-mkdirHDFS上创建目录

$ hadoop fs -mkdir -p /sanguo/shuguo

4-moveFromLocalHDFS

$ touch kongming.txt  $ hadoop fs  -moveFromLocal  ./kongming.txt  /sanguo/shuguo

5-appendToFile

$ touch liubei.txt $ vi liubei.txt 输入 san gu mao lu $ hadoop fs -appendToFile liubei.txt /sanguo/shuguo/kongming.txt

6-cat

$ hadoop fs -cat /sanguo/shuguo/kongming.txt

（7-chgrp -chmod-chownLinux

$ hadoop fs  -chmod  666  /sanguo/shuguo/kongming.txt $ hadoop fs  -chown  atguigu:atguigu   /sanguo/shuguo/kongming.txt

（8-copyFromLocalHDFS路径去

$ hadoop fs -copyFromLocal README.txt /

（9-copyToLocalHDFS拷贝到本地

$ hadoop fs -copyToLocal /sanguo/shuguo/kongming.txt ./

10-cp HDFS的一个路径拷贝到HDFS的另一个路径

$ hadoop fs -cp /sanguo/shuguo/kongming.txt /zhuge.txt

11-mvHDFS目录中移动文件

$ hadoop fs -mv /zhuge.txt /sanguo/shuguo/

12-getcopyToLocalHDFS下载文件到本地

$ hadoop fs -get /sanguo/shuguo/kongming.txt ./

13-getmergeHDFS /user/atguigu/test:log.1, log.2,log.3,...

$ hadoop fs -getmerge /user/atguigu/test/* ./zaiyiqi.txt

14-putcopyFromLocal

$ hadoop fs -put ./zaiyiqi.txt /user/atguigu/test/

（15-tail

$ hadoop fs -tail /sanguo/shuguo/kongming.txt

16-rm

$ hadoop fs -rm /user/atguigu/test/jinlian2.txt

17-rmdir

$ hadoop fs -mkdir /test $ hadoop fs -rmdir /test

18-du

$ hadoop fs -du -s -h /user/atguigu/test 2.7 K  /user/atguigu/test   $ hadoop fs -du  -h /user/atguigu/test  1.3 K  /user/atguigu/test/README.txt 15     /user/atguigu/test/jinlian.txt 1.4 K  /user/atguigu/test/zaiyiqi.txt

19-setrepHDFS中文件的副本数量

$ hadoop fs -setrep 10 /sanguo/shuguo/kongming.txt

　　　　　　　　　　　　　　　　　　　　图

这里设置NameNodeDataNode

3台310台时副本10

来源: https://www.cnblogs.com/Diyo/p/11355689.html