MAPREDUCE-4008. ResourceManager throws MetricsException on start up saying QueueMetrics MBean already exists (Devaraj K via tgraves)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1326707 13f79535-47bb-0310-9956-ffa450edef68

hadoop-mapreduce-project/CHANGES.txt

@@ -241,6 +241,9 @@ Release 2.0.0 - UNRELEASED
     MAPREDUCE-4147. YARN should not have a compile-time dependency on HDFS.
     (tomwhite)
 
+    MAPREDUCE-4008. ResourceManager throws MetricsException on start up 
+    saying QueueMetrics MBean already exists (Devaraj K via tgraves)
+
 Release 0.23.3 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fifo/FifoScheduler.java

@@ -185,8 +185,6 @@ public class FifoScheduler implements ResourceScheduler, Configurable {
   @Override
   public synchronized void setConf(Configuration conf) {
     this.conf = conf;
-    metrics = QueueMetrics.forQueue(DEFAULT_QUEUE_NAME, null, false, conf);
-    activeUsersManager = new ActiveUsersManager(metrics);
   }
   
   @Override
@@ -223,6 +221,9 @@ public class FifoScheduler implements ResourceScheduler, Configurable {
         Resources.createResource(conf.getInt(MINIMUM_ALLOCATION, MINIMUM_MEMORY));
       this.maximumAllocation = 
         Resources.createResource(conf.getInt(MAXIMUM_ALLOCATION, MAXIMUM_MEMORY));
+      this.metrics = QueueMetrics.forQueue(DEFAULT_QUEUE_NAME, null, false,
+          conf);
+      this.activeUsersManager = new ActiveUsersManager(metrics);
       this.initialized = true;
     }
   }