Unable to change Storm scheduler by adding 'storm.scheduler' setting into storm.yaml file.

[#1]

I tried modifying the 'storm.scheduler' setting in /etc/storm/conf/storm.yaml because I need the resource aware scheduler (http://storm.apache.org/releases/current/Resource_Aware_Scheduler_overview.html) so that I can dedicate cores for executors.

I have two nimbuses and one supervisor and three zookeeper. I made the changes to the storm yaml file on the nimbus and supervisor machines. After I restart all components I checked all the storm yaml files but they no longer have my changes. This setting cannot be found listed in the Ambari UI so I cannot use the UI to address the issue.

[#2]

This is an Ambari "feature". Every time you restart the service Ambari overrides the configuration with the configuration defined in Ambari.

To enable RAS you should go to Storm / Configuration / Custom storm-site then click on "Add property ...".

Then you'll be able to add your desired RAS setting:

storm.scheduler: “org.apache.storm.scheduler.resource.ResourceAwareScheduler”

After setting the param you should restart all the Storm services.