Enable the Capacity Scheduler

You must configure the yarn.resourcemanager.scheduler.class property in yarn-site.xml to enable the Capacity Scheduler.

• To enable the Capacity Scheduler, set the following property in the /etc/hadoop/conf/yarn-site.xml file on the ResourceManager host:

  <property>
   <name>yarn.resourcemanager.scheduler.class</name>
   <value>
   org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler
   </value>
  </property>

• The settings for the Capacity Scheduler are contained in the /etc/hadoop/conf/capacity-scheduler.xml file on the ResourceManager host. The Capacity Scheduler reads this file when starting, and also when an administrator modifies the capacity- scheduler.xml file and then reloads the settings by running the following command:

  yarn rmadmin -refreshQueues

  This command can only be run by cluster administrators. Administrator privileges are configured with the yarn.admin.acl property on the ResourceManager.