YARN-9329. updatePriority is blocked when using FairScheduler. Contributed by Jiandan Yang.

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FairScheduler.java

@@ -21,6 +21,7 @@ package org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair;
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Preconditions;
 import com.google.common.collect.Lists;
+import com.google.common.util.concurrent.SettableFuture;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience.LimitedPrivate;
@@ -43,6 +44,7 @@ import org.apache.hadoop.yarn.api.records.Resource;
 import org.apache.hadoop.yarn.api.records.ResourceOption;
 import org.apache.hadoop.yarn.api.records.ResourceRequest;
 import org.apache.hadoop.yarn.api.records.SchedulingRequest;
+import org.apache.hadoop.yarn.api.records.Priority;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.exceptions
         .SchedulerInvalidResoureRequestException;
@@ -2009,4 +2011,13 @@ public class FairScheduler extends
     // Lifetime is the application lifetime by default.
     return lifetime;
   }
+
+  @Override
+  public Priority updateApplicationPriority(Priority newPriority,
+      ApplicationId applicationId, SettableFuture<Object> future,
+      UserGroupInformation user)
+      throws YarnException {
+    throw new YarnException(
+        "Update application priority is not supported in Fair Scheduler");
+  }
 }