1. Prerequisites

  • Ensure that the following property is defined in your hdfs-site.xml file.

    <property>         
       <name>dfs.hosts.exclude</name>        
       <value>$HADOOP_CONF_DIR/excludes</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 mapred-site.xml file.

    <property>         
       <name>mapred.hosts.exclude </name>        
       <value>$HADOOP_CONF_DIR/excludes</value>
       <final>true</final>   
    </property>                 
                

    where $HADOOP_CONF_DIR is the directory for storing the Hadoop configuration files. For example, /etc/hadoop/conf.


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