I use Hadoop2.2.0 to create a master node and a sub node,like follows:
Live Datanodes : 2
Node Transferring Address Last Contact Admin State Configured Capacity (GB)
Used(GB) Non DFS Used (GB) Remaining(GB) Used(%)
master 172.11.12.6:50010 1 In Service 16.15
0.00 2.76 13.39
0.00
node1 172.11.12.7:50010 0 In Service 16.15
0.00 2.75 13.40
0.00
Then I create a abc.txt file on master 172.11.12.6
[hadoop@master ~]$ pwd
/home/hadoop
[hadoop@master ~]$ echo "This is a test." >> abc.txt
[hadoop@master ~]$ hadoop dfs -copyFromLocal test.txt
[hadoop@master ~]$ hadoop dfs -ls
DEPRECATED: Use of this script to execute hdfs command is deprecated.
Instead use the hdfs command for it.
14/01/25 22:07:00 WARN util.NativeCodeLoader: Unable to load native-hadoop
library for your platform... using builtin-java classes where applicable
Found 1 items
-rw-r--r-- 2 hadoop supergroup 16 2014-01-25 21:36 abc.txt
[hadoop@master ~]$ rm abc.txt
[hadoop@master ~]$ hadoop dfs -cat abc.txt
This is a test.
My question is:
1. Is supergroup a directory? Where does it locate?
2. I search abc.txt on master 172.11.12.6 and node1 172.11.12.7 by following
command:
[hadoop@master ~]$ find / -name abc.txt
But I don't find abc.txt file. Where is the file abc.txt? After I erase it by
rm command, I still cat this file? Where is it? My OS is CentOS-5.8.
Thanks.
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