Hi,    I have tried the same steps in Ambari.  I am using HDP 3.1.0.0-78. Here is what I have done: Step 1:  Went to 'Yarn -> Configs -> Advanced -> Scheduler' and set the properties that you have given.  Step 2: Restarted all the affected components in Yarn. However, I am getting an error  java.io.IOException: Failed to initialize FairScheduler Caused by: org.xml.sax.SAXParseException; lineNumber: 19; columnNumber: 1; XML document structures must start and end within the same entity.   Also, in "Scheduler" component in Yarn, I am only getting "Capacity Scheduler" related parameters. If I add "fair-scheduler.xml" in the same folder as that of "yarn-site.xml" and specify parameters only for "default" queue (Here I am not adding any new queue) only to change its scheduling mode to Fair, how to do it?    Can you please guide me? ... View more