diff --git a/hadoop-mapreduce-project/CHANGES.txt b/hadoop-mapreduce-project/CHANGES.txt
index da29131aff..e316a6bc21 100644
--- a/hadoop-mapreduce-project/CHANGES.txt
+++ b/hadoop-mapreduce-project/CHANGES.txt
@@ -40,9 +40,9 @@ Trunk (unreleased changes)
     MAPREDUCE-3415. improve MiniMRYarnCluster & DistributedShell JAR resolution.
     (tucu)
 
-		HADOOP-7862   MR changes to work with HADOOP 7862: 
-									Move the support for multiple protocols to lower layer so that Writable,
-								  PB and Avro can all use it (Sanjay)
+    HADOOP-7862   MR changes to work with HADOOP 7862: 
+    Move the support for multiple protocols to lower layer so that Writable,
+    PB and Avro can all use it (Sanjay)
 
   BUG FIXES
     MAPREDUCE-3412. Fix 'ant docs'. (amarrk)
@@ -249,6 +249,9 @@ Release 0.23.1 - Unreleased
     MAPREDUCE-3496. Fixed client to print queue acls in consistent order.
     (Jonathan Eagles via acmurthy) 
 
+    MAPREDUCE-3147. Handle leaf queues with the same name properly. (Ravi Prakash via
+    mahadev)
+
 Release 0.23.0 - 2011-11-01 
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/CapacityScheduler.java b/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/CapacityScheduler.java
index 16cdbae771..5f080f8364 100644
--- a/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/CapacityScheduler.java
+++ b/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/CapacityScheduler.java
@@ -214,7 +214,8 @@ public CSQueue hook(CSQueue queue) {
   private static final QueueHook noop = new QueueHook();
   
   @Lock(CapacityScheduler.class)
-  private void initializeQueues(CapacitySchedulerConfiguration conf) {
+  private void initializeQueues(CapacitySchedulerConfiguration conf)
+    throws IOException {
     root = 
         parseQueue(this, conf, null, ROOT, queues, queues, 
             queueComparator, applicationComparator, noop);
@@ -283,7 +284,7 @@ static CSQueue parseQueue(
       Map<String, CSQueue> oldQueues, 
       Comparator<CSQueue> queueComparator,
       Comparator<SchedulerApp> applicationComparator,
-      QueueHook hook) {
+      QueueHook hook) throws IOException {
     CSQueue queue;
     String[] childQueueNames = 
       conf.getQueues((parent == null) ? 
@@ -316,6 +317,11 @@ static CSQueue parseQueue(
       parentQueue.setChildQueues(childQueues);
     }
 
+    if(queue instanceof LeafQueue == true && queues.containsKey(queueName)
+      && queues.get(queueName) instanceof LeafQueue == true) {
+      throw new IOException("Two leaf queues were named " + queueName
+        + ". Leaf queue names must be distinct");
+    }
     queues.put(queueName, queue);
 
     LOG.info("Initialized queue: " + queue);
diff --git a/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestApplicationLimits.java b/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestApplicationLimits.java
index 32d8d97215..3db772c498 100644
--- a/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestApplicationLimits.java
+++ b/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestApplicationLimits.java
@@ -20,6 +20,7 @@
 import static org.junit.Assert.*;
 import static org.mockito.Mockito.*;
 
+import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -44,7 +45,7 @@ public class TestApplicationLimits {
   LeafQueue queue;
   
   @Before
-  public void setUp() {
+  public void setUp() throws IOException {
     CapacitySchedulerConfiguration csConf = 
         new CapacitySchedulerConfiguration();
     setupQueueConfiguration(csConf);
diff --git a/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestCapacityScheduler.java b/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestCapacityScheduler.java
index 3c110b2130..a43ea51c3f 100644
--- a/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestCapacityScheduler.java
+++ b/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestCapacityScheduler.java
@@ -240,4 +240,21 @@ private void checkNodeResourceUsage(int expected,
     node.checkResourceUsage();
   }
 
+  /** Test that parseQueue throws an exception when two leaf queues have the
+   *  same name
+ * @throws IOException
+   */
+  @Test(expected=IOException.class)
+  public void testParseQueue() throws IOException {
+    CapacityScheduler cs = new CapacityScheduler();
+
+    CapacitySchedulerConfiguration conf = new CapacitySchedulerConfiguration();
+    setupQueueConfiguration(conf);
+    conf.setQueues(CapacityScheduler.ROOT + ".a.a1", new String[] {"b1"} );
+    conf.setCapacity(CapacityScheduler.ROOT + ".a.a1.b1", 100);
+    conf.setUserLimitFactor(CapacityScheduler.ROOT + ".a.a1.b1", 100.0f);
+
+    cs.reinitialize(conf, null, null);
+  }
+
 }