Hadoop的HDFS操作
在本地创建目录 /home/marry ,并在该目录下创建三个空文件,文件名分别为1.txt,2.txt,3.txt
``` root@master:/home# mkdir marry root@master:/home# cd marry root@master:/home/marry# touch 1.txt root@master:/home/marry# touch 2.txt root@master:/home/marry# touch 3.txt
代码语言:javascript复制3. 在HDFS上创建目录 /demo/test; /demo/test1 /demo/test2 /demo/test3 /demo/test4
4. ![](https://strongwillpro.oss-cn-beijing.aliyuncs.com/img/实验四2.PNG)
5. ```
root@master:/home/marry# hadoop fs -mkdir -p /demo/test
root@master:/home/marry# hadoop fs -mkdir /demo/test1
root@master:/home/marry# hadoop fs -mkdir /demo/test2
root@master:/home/marry# hadoop fs -mkdir /demo/test3
root@master:/home/marry# hadoop fs -mkdir /demo/test4
将本地的 1.txt 上传到 HDFS 的 /demo/test1 下,将 2.txt 和 3.txt 上传到 /demo/test 下
``` root@master:/home/marry# hadoop fs -put /home/marry/1.txt /demo/test1 root@master:/home/marry# hadoop fs -put /home/marry/2.txt /home/marry/3.txt /demo/test
代码语言:javascript复制9. ![](https://strongwillpro.oss-cn-beijing.aliyuncs.com/img/实验四3.PNG)
10. ![](https://strongwillpro.oss-cn-beijing.aliyuncs.com/img/实验四4.PNG)
11. ![](https://strongwillpro.oss-cn-beijing.aliyuncs.com/img/实验四5.PNG)
12. ![](https://strongwillpro.oss-cn-beijing.aliyuncs.com/img/实验四6.PNG)
13. 将hello world写入到本地的1.txt文件中,再将其内容追加到HDFS的1.txt中,并查看是否追加成功
14. ![](https://strongwillpro.oss-cn-beijing.aliyuncs.com/img/20221011211422.png)
15. ```
root@master:/home/marry# echo hello world > 1.txt
root@master:/home/marry# hadoop fs -appendToFile 1.txt /demo/test1/1.txt
root@master:/home/marry# hadoop fs -cat /demo/test1/1.txt
将HDFS中的2.txt重命名为4.txt,并将4.txt复制到/demo/test4下
``` root@master:/home/marry# hadoop fs -mv /demo/test/2.txt /demo/test/4.txt root@master:/home/marry# hadoop fs -cp /demo/test/4.txt /demo/test4
代码语言:javascript复制19. 将HDFS中的3.txt移动到/demo/test3下,文件名为33.txt
20. ![](https://strongwillpro.oss-cn-beijing.aliyuncs.com/img/20221011212341.png)
21. ```
root@master:/home/marry# hadoop fs -mv /demo/test/3.txt /demo/test3/33.txt
将HDFS上的4.txt文件复制到本地的/home/marry下。
``` root@master:/home/marry# hadoop fs -get /demo/test4/4.txt /home/marry
代码语言:javascript复制25. 删除HDFS上的4.txt文件。
26. ![](https://strongwillpro.oss-cn-beijing.aliyuncs.com/img/20221011212717.png)
27. ```
root@master:/home/marry# hadoop fs -rm /demo/test4/4.txt