2. Add Properties to core-site.xml

Stop HDFS using the instructions on this page.

Add the following properties to core-site.xml:

<property>
<name>topology.script.file.name</name> 
<value>/etc/hadoop/conf/rack-topology.sh</value>
</property>

<property> 
<name>topology.script.number.args</name> 
<value>1</value>
</property>