Hadoop的HDFS操作

1. 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

2. ```
   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

   
   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

3. 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

5. ```
   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

   
   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

6. 将HDFS中的2.txt重命名为4.txt,并将4.txt复制到/demo/test4下

7. 

8. ```
   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

   
   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

9. 将HDFS上的4.txt文件复制到本地的/home/marry下。

10. 

11. ```
    root@master:/home/marry# hadoop fs -get /demo/test4/4.txt /home/marry

    
    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