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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.
Is there a command using which I can do this?
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You must use the start command and not restart . The following fetches the status for hadoop-hdfs-namenode . You can use the status command to verify that the process has stopped or started.
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
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