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HDFS使用

developer 2022年06月12日 大数据 189 0
一 HDFS命令行操作演示
[root@localhost ~]# hadoop fs -ls /
Warning: $HADOOP_HOME is deprecated.
 
Found 1 items
drwxr-xr-x - root supergroup 0 2017-08-20 11:23 /hadoop
 
[root@localhost ~]# hadoop fs -ls /hadoop
Warning: $HADOOP_HOME is deprecated.
 
Found 1 items
drwxr-xr-x - root supergroup 0 2017-08-20 11:40 /hadoop/mapred
[root@localhost ~]# hadoop fs -mkdir input
Warning: $HADOOP_HOME is deprecated.
 
[root@localhost ~]# hadoop fs -ls
Warning: $HADOOP_HOME is deprecated.
 
Found 1 items
drwxr-xr-x - root supergroup 0 2017-08-20 12:40 /user/root/input
 
[root@localhost ~]# hadoop fs -ls /
Warning: $HADOOP_HOME is deprecated.
 
Found 2 items
drwxr-xr-x - root supergroup 0 2017-08-20 11:23 /hadoop
drwxr-xr-x - root supergroup 0 2017-08-20 12:40 /user
[root@localhost ~]# hadoop fs -put a.av input/
[root@localhost ~]# hadoop fs -ls /user/root/input
Warning: $HADOOP_HOME is deprecated.
 
Found 1 items
-rw-r--r-- 3 root supergroup 0 2017-08-20 12:44 /user/root/input/a.av
[root@localhost ~]# hadoop fs -cat input/a.av
Warning: $HADOOP_HOME is deprecated.
 
[root@localhost ~]# hadoop fs -get input/a.av aa.av
Warning: $HADOOP_HOME is deprecated.
 
[root@localhost ~]# ls
123 cangls fping-4.0 monitor_man shell16.sh system_man.sh
aa.av canyls fping-4.0.tar.gz monitor_man.sh shell5.sh Templates
a.av ChangeLog-2.6.0 hping-master Music student.txt test
 
[root@localhost ~]# hadoop dfsadmin -report
Warning: $HADOOP_HOME is deprecated.
 
Configured Capacity: 21464350720 (19.99 GB)
Present Capacity: 21046108160 (19.6 GB)
DFS Remaining: 21046083584 (19.6 GB)
DFS Used: 24576 (24 KB)
DFS Used%: 0%
Under replicated blocks: 1
Blocks with corrupt replicas: 0
Missing blocks: 0
 
-------------------------------------------------
Datanodes available: 1 (1 total, 0 dead)
 
Name: 127.0.0.1:50010
Decommission Status : Normal
Configured Capacity: 21464350720 (19.99 GB)
DFS Used: 24576 (24 KB)
Non DFS Used: 418242560 (398.87 MB)
DFS Remaining: 21046083584(19.6 GB)
DFS Used%: 0%
DFS Remaining%: 98.05%
Last contact: Sun Aug 20 12:56:33 CST 2017

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HDFS特点