Administering HDFS

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Prerequisites to decommission slave nodes

Make sure the appropriate properties are defined in the hdfs-site.xml file and yarn-site.xml files.

Ensure that the following property is defined in your hdfs-site.xml file.
```
<property> 
 <name>dfs.hosts.exclude</name> 
 <value><HADOOP_CONF_DIR>/dfs.exclude</value>
 <final>true</final> 
 </property> 
```
where <HADOOP_CONF_DIR> is the directory for storing the Hadoop configuration files. For example, /etc/hadoop/conf.

Ensure that the following property is defined in your yarn-site.xml file.
```
<property> 
 <name>yarn.resourcemanager.nodes.exclude-path</name> 
 <value><HADOOP_CONF_DIR>/yarn.exclude</value>
 <final>true</final> 
</property>
```
where <HADOOP_CONF_DIR> is the directory for storing the Hadoop configuration files. For example, /etc/hadoop/conf.