The CapacityScheduler is designed to run Hadoop applications as a shared, multi-tenant cluster in an operator-friendly manner while maximizing the throughput and the utilization of the cluster.

The CapacityScheduler is designed to allow sharing a large cluster while giving each organization a minimum capacity guarantee

To configure the ResourceManager to use the CapacityScheduler, set the following property in the conf/yarn-site.xml:

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

Each child queue is tied to its parent queue with the yarn.scheduler.capacity.<queue-path>.queues configuration property in the capacity-scheduler.xml file

<property>
<name>yarn.scheduler.capacity.root.queues</name>
<value>default</value>
<description>
The queues at the this level (root is the root queue).
</description>

<property>

The Capacity Scheduler reads this file when starting,when you modifies the capacity-scheduler.xml file you have to reloads the settings by running the following command:

yarn rmadmin -refreshQueues

After successful completion of the above command, you may verify if the queues are setup using below  command:

-bash-4.1$ hadoop queue -list
DEPRECATED: Use of this script to execute mapred command is deprecated.
Instead use the mapred command for it.

15/08/14 16:31:20 INFO client.RMProxy: Connecting to ResourceManager at sphdmst03.dev.bmocm.com/192.168.68.131:8032
======================
Queue Name : default
Queue State : running
Scheduling Info : Capacity: 100.0, MaximumCapacity: 100.0, CurrentCapacity: 0.0

use the below command to identify the queue names on which you could submit your jobs.

-bash-4.1$ hadoop queue -showacls
DEPRECATED: Use of this script to execute mapred command is deprecated.
Instead use the mapred command for it.

15/08/14 16:35:11 INFO client.RMProxy: Connecting to ResourceManager at sphdmst03.dev.bmocm.com/192.168.68.131:8032
Queue acls for user :  gpadmin

Queue  Operations
=====================
root  ADMINISTER_QUEUE,SUBMIT_APPLICATIONS
default  ADMINISTER_QUEUE,SUBMIT_APPLICATIONS