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.
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