How to restart yarn on AWS EMR

Question

I am using Hadoop 2.6.0 (emr-4.2.0 image). I have made some changes in yarn-site.xml and want to restart yarn to bring the changes into effect.

Answer 1

For those who are gonna come from Google

In order to restart a service in EMR, perform the following actions:

• Find the name of the service by running the following command:

  initctl list
  

For example, the YARN Resource Manager service is named hadoop-yarn-resourcemanager.

• Stop the service by running the following command:

  sudo stop hadoop-yarn-resourcemanager
  

• Wait a few seconds, then start the service by running the following command:

  sudo start hadoop-yarn-resourcemanager
  

Note: Stop/start is required; do not use the restart command.

• Verify that the process is running by running the following command:

  sudo status hadoop-yarn-resourcemanager
  

Check for the process using ps, and then check the log file for any errors in the log directory /var/log/.

Source : https://aws.amazon.com/premiumsupport/knowledge-center/restart-service-emr/