YARN-6845. Variable scheduler of FSLeafQueue duplicates the one of its parent FSQueue.

(Contributed by Yufei Gu via Daniel Templeton)

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

@@ -52,7 +52,6 @@ public class FSLeafQueue extends FSQueue {
   private static final Log LOG = LogFactory.getLog(FSLeafQueue.class.getName());
   private static final List<FSQueue> EMPTY_LIST = Collections.emptyList();
 
-  private FairScheduler scheduler;
   private FSContext context;
 
   // apps that are runnable
@@ -76,7 +75,6 @@ public class FSLeafQueue extends FSQueue {
   public FSLeafQueue(String name, FairScheduler scheduler,
       FSParentQueue parent) {
     super(name, scheduler, parent);
-    this.scheduler = scheduler;
     this.context = scheduler.getContext();
     this.lastTimeAtMinShare = scheduler.getClock().getTime();
     activeUsersManager = new ActiveUsersManager(getMetrics());