diff --git a/hadoop-mapreduce-project/CHANGES.txt b/hadoop-mapreduce-project/CHANGES.txt
index e4f023e03c7..1e3ae4f5bb6 100644
--- a/hadoop-mapreduce-project/CHANGES.txt
+++ b/hadoop-mapreduce-project/CHANGES.txt
@@ -9,6 +9,9 @@ Release 2.0.3-alpha - Unreleased
 
   NEW FEATURES
 
+    MAPREDUCE-4520. Added support for MapReduce applications to request for
+    CPU cores along-with memory post YARN-2. (acmurthy)
+
   IMPROVEMENTS
 
     MAPREDUCE-3678. The Map tasks logs should have the value of input
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/JobImpl.java b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/JobImpl.java
index b20457f862d..7306cda792b 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/JobImpl.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/JobImpl.java
@@ -1050,6 +1050,10 @@ public class JobImpl implements org.apache.hadoop.mapreduce.v2.app.job.Job,
         conf.getInt(MRJobConfig.MR_AM_VMEM_MB,
             MRJobConfig.DEFAULT_MR_AM_VMEM_MB);
 
+    long sysCPUSizeForUberSlot =
+        conf.getInt(MRJobConfig.MR_AM_CPU_VCORES,
+            MRJobConfig.DEFAULT_MR_AM_CPU_VCORES);
+
     boolean uberEnabled =
         conf.getBoolean(MRJobConfig.JOB_UBERTASK_ENABLE, false);
     boolean smallNumMapTasks = (numMapTasks <= sysMaxMaps);
@@ -1061,6 +1065,13 @@ public class JobImpl implements org.apache.hadoop.mapreduce.v2.app.job.Job,
             conf.getLong(MRJobConfig.REDUCE_MEMORY_MB, 0))
             <= sysMemSizeForUberSlot)
             || (sysMemSizeForUberSlot == JobConf.DISABLED_MEMORY_LIMIT));
+    boolean smallCpu =
+        (
+            Math.max(
+                conf.getInt(MRJobConfig.MAP_CPU_VCORES, 1), 
+                conf.getInt(MRJobConfig.REDUCE_CPU_VCORES, 1)) < 
+             sysCPUSizeForUberSlot
+        );
     boolean notChainJob = !isChainJob(conf);
 
     // User has overall veto power over uberization, or user can modify
@@ -1071,7 +1082,8 @@ public class JobImpl implements org.apache.hadoop.mapreduce.v2.app.job.Job,
     // while "uber-AM" (MR AM + LocalContainerLauncher) loops over tasks
     // and thus requires sequential execution.
     isUber = uberEnabled && smallNumMapTasks && smallNumReduceTasks
-        && smallInput && smallMemory && notChainJob && isValidUberMaxReduces;
+        && smallInput && smallMemory && smallCpu 
+        && notChainJob && isValidUberMaxReduces;
 
     if (isUber) {
       LOG.info("Uberizing job " + jobId + ": " + numMapTasks + "m+"
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TaskAttemptImpl.java b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TaskAttemptImpl.java
index f7aedbbed9f..31ea2f2ac1a 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TaskAttemptImpl.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TaskAttemptImpl.java
@@ -527,7 +527,10 @@ public abstract class TaskAttemptImpl implements
 
     //TODO:create the resource reqt for this Task attempt
     this.resourceCapability = recordFactory.newRecordInstance(Resource.class);
-    this.resourceCapability.setMemory(getMemoryRequired(conf, taskId.getTaskType()));
+    this.resourceCapability.setMemory(
+        getMemoryRequired(conf, taskId.getTaskType()));
+    this.resourceCapability.setVirtualCores(
+        getCpuRequired(conf, taskId.getTaskType()));
     this.dataLocalHosts = dataLocalHosts;
     RackResolver.init(conf);
 
@@ -551,6 +554,21 @@ public abstract class TaskAttemptImpl implements
     return memory;
   }
 
+  private int getCpuRequired(Configuration conf, TaskType taskType) {
+    int vcores = 1;
+    if (taskType == TaskType.MAP)  {
+      vcores =
+          conf.getInt(MRJobConfig.MAP_CPU_VCORES,
+              MRJobConfig.DEFAULT_MAP_CPU_VCORES);
+    } else if (taskType == TaskType.REDUCE) {
+      vcores =
+          conf.getInt(MRJobConfig.REDUCE_CPU_VCORES,
+              MRJobConfig.DEFAULT_REDUCE_CPU_VCORES);
+    }
+    
+    return vcores;
+  }
+
   /**
    * Create a {@link LocalResource} record with all the given parameters.
    */
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/MRJobConfig.java b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/MRJobConfig.java
index cfc50af6d25..cb11711356b 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/MRJobConfig.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/MRJobConfig.java
@@ -181,7 +181,8 @@ public interface MRJobConfig {
   public static final String MAP_MEMORY_MB = "mapreduce.map.memory.mb";
   public static final int DEFAULT_MAP_MEMORY_MB = 1024;
 
-  public static final String MAP_MEMORY_PHYSICAL_MB = "mapreduce.map.memory.physical.mb";
+  public static final String MAP_CPU_VCORES = "mapreduce.map.cpu.vcores";
+  public static final int DEFAULT_MAP_CPU_VCORES = 1;
 
   public static final String MAP_ENV = "mapreduce.map.env";
 
@@ -225,11 +226,12 @@ public interface MRJobConfig {
 
   public static final String REDUCE_MARKRESET_BUFFER_SIZE = "mapreduce.reduce.markreset.buffer.size";
 
-  public static final String REDUCE_MEMORY_PHYSICAL_MB = "mapreduce.reduce.memory.physical.mb";
-
   public static final String REDUCE_MEMORY_MB = "mapreduce.reduce.memory.mb";
   public static final int DEFAULT_REDUCE_MEMORY_MB = 1024;
 
+  public static final String REDUCE_CPU_VCORES = "mapreduce.reduce.cpu.vcores";
+  public static final int DEFAULT_REDUCE_CPU_VCORES = 1;
+
   public static final String REDUCE_MEMORY_TOTAL_BYTES = "mapreduce.reduce.memory.totalbytes";
 
   public static final String SHUFFLE_INPUT_BUFFER_PERCENT = "mapreduce.reduce.shuffle.input.buffer.percent";
@@ -350,6 +352,11 @@ public interface MRJobConfig {
     MR_AM_PREFIX+"resource.mb";
   public static final int DEFAULT_MR_AM_VMEM_MB = 1536;
 
+  /** The number of virtual cores the MR app master needs.*/
+  public static final String MR_AM_CPU_VCORES =
+    MR_AM_PREFIX+"resource.cpu-vcores";
+  public static final int DEFAULT_MR_AM_CPU_VCORES = 1;
+
   /** Command line arguments passed to the MR app master.*/
   public static final String MR_AM_COMMAND_OPTS =
     MR_AM_PREFIX+"command-opts";
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml
index 34e8330038c..dd52b80ad42 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml
@@ -474,6 +474,22 @@
   </description>
 </property>
 
+<property>
+  <name>mapreduce.map.cpu.vcores</name>
+  <value>1</value>
+  <description>
+      The number of virtual cores required for each map task.
+  </description>
+</property>
+
+<property>
+  <name>mapreduce.reduce.cpu.vcores</name>
+  <value>1</value>
+  <description>
+      The number of virtual cores required for each reduce task.
+  </description>
+</property>
+
 <property>
   <name>mapreduce.reduce.merge.inmem.threshold</name>
   <value>1000</value>
@@ -1340,6 +1356,14 @@
   <description>The amount of memory the MR AppMaster needs.</description>
 </property>
 
+<property>
+  <name>yarn.app.mapreduce.am.resource.cpu-vcores</name>
+  <value>1</value>
+  <description>
+      The number of virtual CPU cores the MR AppMaster needs.
+  </description>
+</property>
+
 <property>
   <description>CLASSPATH for MR applications. A comma-separated list
   of CLASSPATH entries</description>
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/main/java/org/apache/hadoop/mapred/YARNRunner.java b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/main/java/org/apache/hadoop/mapred/YARNRunner.java
index 1b684364f51..c3f6b75b756 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/main/java/org/apache/hadoop/mapred/YARNRunner.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/main/java/org/apache/hadoop/mapred/YARNRunner.java
@@ -324,8 +324,16 @@ public class YARNRunner implements ClientProtocol {
 
     // Setup resource requirements
     Resource capability = recordFactory.newRecordInstance(Resource.class);
-    capability.setMemory(conf.getInt(MRJobConfig.MR_AM_VMEM_MB,
-        MRJobConfig.DEFAULT_MR_AM_VMEM_MB));
+    capability.setMemory(
+        conf.getInt(
+            MRJobConfig.MR_AM_VMEM_MB, MRJobConfig.DEFAULT_MR_AM_VMEM_MB
+            )
+        );
+    capability.setVirtualCores(
+        conf.getInt(
+            MRJobConfig.MR_AM_CPU_VCORES, MRJobConfig.DEFAULT_MR_AM_CPU_VCORES
+            )
+        );
     LOG.debug("AppMaster capability = " + capability);
 
     // Setup LocalResources