How to remove Datanode from the recovery Hadoop cluster

Sometimes it may be necessary to remove Datanode from the Hadoop cluster because of a temporary adjustment, as follows:

First add the machine name of the node you want to delete in/etc/hadoop/conf/dfs.exclude

In the console page, you see a dead datanodes

To refresh node information using commands:

[HDFS@HMC ~]$ Hadoop dfsadmin-refreshnodes

To view HDFs usage reports: [HDFS@HMC ~]$ hadoop dfsadmin-report Red font status indicates node exit

name:192.168.100.210:50010

Decommission status:decommissioned

Configured capacity:0 (0 KB)

DFS used:0 (0 KB)

Non DFS used:0 (0 KB)

DFS remaining:0 (0 KB)

DFS used%: 100%

DFS remaining%: 0%

Last Contact:thu 07:00:00 CST 1970

Login http://192.168.100.200:50030/jobtracker.jsp View node or there are 11