YARN-8948. PlacementRule interface should be for all YarnSchedulers. Contributed by Bibin A Chundatt.

(cherry picked from commit a68d766e876631d7ee2e1a6504d4120ba628d178)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/placement/AppNameMappingPlacementRule.java

@@ -20,11 +20,12 @@ package org.apache.hadoop.yarn.server.resourcemanager.placement;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.api.records.ApplicationSubmissionContext;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.exceptions.YarnException;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CSQueue;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerContext;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerQueueManager;
@@ -61,8 +62,15 @@ public class AppNameMappingPlacementRule extends PlacementRule {
   }
 
   @Override
-  public boolean initialize(CapacitySchedulerContext schedulerContext)
+  public boolean initialize(ResourceScheduler scheduler)
       throws IOException {
+    if (!(scheduler instanceof CapacityScheduler)) {
+      throw new IOException(
+          "AppNameMappingPlacementRule can be configured only for "
+              + "CapacityScheduler");
+    }
+    CapacitySchedulerContext schedulerContext =
+        (CapacitySchedulerContext) scheduler;
     CapacitySchedulerConfiguration conf = schedulerContext.getConfiguration();
     boolean overrideWithQueueMappings = conf.getOverrideWithQueueMappings();
     LOG.info(

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/placement/PlacementRule.java

@@ -22,7 +22,7 @@ import java.io.IOException;
 
 import org.apache.hadoop.yarn.api.records.ApplicationSubmissionContext;
 import org.apache.hadoop.yarn.exceptions.YarnException;
-import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerContext;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceScheduler;
 
 public abstract class PlacementRule {
 
@@ -31,7 +31,7 @@ public abstract class PlacementRule {
   }
 
   public abstract boolean initialize(
-      CapacitySchedulerContext schedulerContext) throws IOException;
+      ResourceScheduler scheduler) throws IOException;
 
   /**
    * Get queue for a given application

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/placement/UserGroupMappingPlacementRule.java

@@ -34,8 +34,10 @@ import org.apache.hadoop.yarn.exceptions.YarnException;
 import org.apache.hadoop.yarn.server.resourcemanager.placement.UserGroupMappingPlacementRule.QueueMapping.MappingType;
 
 import com.google.common.annotations.VisibleForTesting;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.AutoCreatedLeafQueue;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CSQueue;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerContext;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerQueueManager;
@@ -230,8 +232,15 @@ public class UserGroupMappingPlacementRule extends PlacementRule {
 
   @VisibleForTesting
   @Override
-  public boolean initialize(CapacitySchedulerContext schedulerContext)
+  public boolean initialize(ResourceScheduler scheduler)
       throws IOException {
+    if (!(scheduler instanceof CapacityScheduler)) {
+      throw new IOException(
+          "UserGroupMappingPlacementRule can be configured only for "
+              + "CapacityScheduler");
+    }
+    CapacitySchedulerContext schedulerContext =
+        (CapacitySchedulerContext) scheduler;
     CapacitySchedulerConfiguration conf = schedulerContext.getConfiguration();
     boolean overrideWithQueueMappings = conf.getOverrideWithQueueMappings();
     LOG.info(