Decommissioning DataNodes

This section lists the steps to decommission DataNodes.

To decommission a DataNode from the HDFS cluster, perform the following steps:

Modify the dfs.exclude file as specified under the dfs.hosts.exclude value in hdfs-site.xml by adding the nodes to be decommissioned.
```
dfs.exclude file
<hostname1>
<hostname2>
```
Run the following command for the changes to take effect:
```
hdfs dfsadmin -refreshNodes
```
Monitor the decommissioning process by running the following command:
```
hdfs dfsadmin -report
```
Note: When the DataNode is DECOMMISSIONED, you can stop the DataNode.