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

Edit (10/26/2017): A more detailed Knowledge Center article on how to do this has been published here by AWS officially - https://aws.amazon.com/premiumsupport/knowledge-center/restart-service-emr/.

You can ssh into the master node of your EMR cluster and run -

"sudo /sbin/stop hadoop-yarn-resourcemanager"
"sudo /sbin/start hadoop-yarn-resourcemanager"

commands to restart the Yarn resource manager. EMR AMI 4.x.x uses upstart - /sbin/{start,stop,restart} are all symlinks to /sbin/initctl, which is part of upstart. See the initctl man page for more information.

Alternatively, you can follow the instructions here to propagate your changes to yarn-site.xml - yarn-change-configuration-on-yarn-site-xml