Know the disk space of data nodes in hadoop?

Question

Is there a way or any command using which I can come to know the disk space of each datanode or the total cluster disk space?

I tried the command

dfs -du -h /

but it seems that I do not have permission to execute it for many directories and hence cannot get the actual disk space.

Answer 1

From UI:

http://namenode:50070/dfshealth.html#tab-datanode

---> which will give you all the details about datanode.

From command line:

To get disk space of each datanode:

sudo -u hdfs hdfs dfsadmin -report

---> which will give you the details of entire HDFS and the individual datanodes OR

sudo -u hdfs hdfs dfs -du -h /

---> which will give you the total disk usage of each folder under root / directory