<configuration>
    <property>
        <name>mapred.jobtracker.nodegroup.aware</name>
        <value>true</value>
        <description>Identify if jobtracker is aware of nodegroup layer.</description>
    </property>
    <property>
        <name>mapred.task.cache.levels</name>
        <value>3</value>
        <description>This is the max level of the task cache. For example, if the level is 2, the tasks cached are at the host level and at the rack level.</description>
    </property>
    <property>
        <name>mapred.jobtracker.jobSchedulable</name>
        <value>org.apache.hadoop.mapred.JobSchedulableWithNodeGroup</value>
        <description>The class responsible for an entity in FairScheduler that can launch tasks.</description>
    </property>
</configuration>