Merge -c 1391929 from trunk to branch-2 to fix YARN-137. Change the default YARN scheduler to be the CapacityScheduler. Contributed by Siddharth Seth.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1391930 13f79535-47bb-0310-9956-ffa450edef68

hadoop-yarn-project/CHANGES.txt

@@ -48,6 +48,9 @@ Release 2.0.2-alpha - 2012-09-07
     YARN-80. Add support for delaying rack-local containers in
     CapacityScheduler. (acmurthy) 
 
+    YARN-137. Change the default YARN scheduler to be the CapacityScheduler. 
+    (sseth via acmurthy) 
+
   OPTIMIZATIONS
 
   BUG FIXES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/Priority.java

@@ -64,4 +64,8 @@ public abstract class Priority implements Comparable<Priority> {
     return this.getPriority() - other.getPriority();
   }
 
+  @Override
+  public String toString() {
+    return "{Priority: " + getPriority() + "}";
+  }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ResourceRequestPBImpl.java

@@ -162,5 +162,10 @@ public class ResourceRequestPBImpl extends  ResourceRequest {
   private ResourceProto convertToProtoFormat(Resource t) {
     return ((ResourcePBImpl)t).getProto();
   }
-
+  
-}  
+  @Override
+  public String toString() {
+    return "{Priority: " + getPriority() + ", Capability: " + getCapability()
+        + "}";
+  }
+}

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/test/java/org/apache/hadoop/yarn/applications/distributedshell/TestDistributedShell.java

@@ -31,6 +31,8 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.util.JarFinder;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.server.MiniYARNCluster;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceScheduler;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fifo.FifoScheduler;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.Test;
@@ -41,7 +43,7 @@ public class TestDistributedShell {
       LogFactory.getLog(TestDistributedShell.class);
 
   protected static MiniYARNCluster yarnCluster = null;
-  protected static Configuration conf = new Configuration();
+  protected static Configuration conf = new YarnConfiguration();
 
   protected static String APPMASTER_JAR = JarFinder.getJar(ApplicationMaster.class);
 
@@ -49,6 +51,8 @@ public class TestDistributedShell {
   public static void setup() throws InterruptedException, IOException {
     LOG.info("Starting up YARN cluster");
     conf.setInt(YarnConfiguration.RM_SCHEDULER_MINIMUM_ALLOCATION_MB, 128);
+    conf.setClass(YarnConfiguration.RM_SCHEDULER, 
+        FifoScheduler.class, ResourceScheduler.class);
     if (yarnCluster == null) {
       yarnCluster = new MiniYARNCluster(TestDistributedShell.class.getName(),
           1, 1, 1);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java

@@ -208,6 +208,8 @@ public class YarnConfiguration extends Configuration {
   public static final String RM_SCHEDULER = 
     RM_PREFIX + "scheduler.class";
  
+  public static final String DEFAULT_RM_SCHEDULER = 
+      "org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler";
 
   //Delegation token related keys
   public static final String  DELEGATION_KEY_UPDATE_INTERVAL_KEY = 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml

@@ -185,6 +185,7 @@
   <property>
     <description>The class to use as the resource scheduler.</description>
     <name>yarn.resourcemanager.scheduler.class</name>
+    <value>org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler</value>
   </property>
 
   <property>

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

@@ -64,7 +64,6 @@ import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeEventType;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.SchedulerEvent;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.SchedulerEventType;
-import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fifo.FifoScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.security.ApplicationTokenSecretManager;
 import org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer;
 import org.apache.hadoop.yarn.server.resourcemanager.security.RMContainerTokenSecretManager;
@@ -256,10 +255,22 @@ public class ResourceManager extends CompositeService implements Recoverable {
   }
 
   protected ResourceScheduler createScheduler() {
-    return ReflectionUtils.newInstance(this.conf.getClass(
+    String schedulerClassName = conf.get(YarnConfiguration.RM_SCHEDULER,
-        YarnConfiguration.RM_SCHEDULER, FifoScheduler.class,
+        YarnConfiguration.DEFAULT_RM_SCHEDULER);
-        ResourceScheduler.class), this.conf);
+    LOG.info("Using Scheduler: " + schedulerClassName);
-  }
+    try {
+      Class<?> schedulerClazz = Class.forName(schedulerClassName);
+      if (ResourceScheduler.class.isAssignableFrom(schedulerClazz)) {
+        return (ResourceScheduler) ReflectionUtils.newInstance(schedulerClazz,
+            this.conf);
+      } else {
+        throw new YarnException("Class: " + schedulerClassName
+            + " not instance of " + ResourceScheduler.class.getCanonicalName());
+      }
+    } catch (ClassNotFoundException e) {
+      throw new YarnException("Could not instantiate Scheduler: "
+          + schedulerClassName, e);
+    }  }
 
   protected ApplicationMasterLauncher createAMLauncher() {
     return new ApplicationMasterLauncher(this.clientToAMSecretManager,

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/MockAM.java

@@ -112,7 +112,7 @@ public class MockAM {
       ResourceRequest hostReq = createResourceReq(host, memory, priority,
           containers);
       reqs.add(hostReq);
-      ResourceRequest rackReq = createResourceReq("default-rack", memory,
+      ResourceRequest rackReq = createResourceReq("/default-rack", memory,
           priority, containers);
       reqs.add(rackReq);
     }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/MockRM.java

@@ -36,6 +36,7 @@ import org.apache.hadoop.yarn.api.records.ContainerLaunchContext;
 import org.apache.hadoop.yarn.api.records.NodeId;
 import org.apache.hadoop.yarn.api.records.Resource;
 import org.apache.hadoop.yarn.api.records.NodeState;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.server.resourcemanager.amlauncher.AMLauncherEvent;
 import org.apache.hadoop.yarn.server.resourcemanager.amlauncher.ApplicationMasterLauncher;
 import org.apache.hadoop.yarn.server.resourcemanager.recovery.StoreFactory;
@@ -58,12 +59,12 @@ import org.apache.log4j.Logger;
 public class MockRM extends ResourceManager {
 
   public MockRM() {
-    this(new Configuration());
+    this(new YarnConfiguration());
   }
 
   public MockRM(Configuration conf) {
-    super(StoreFactory.getStore(conf));
+    super(StoreFactory.getStore(conf));    
-    init(conf);
+    init(conf instanceof YarnConfiguration ? conf : new YarnConfiguration(conf));
     Logger rootLogger = LogManager.getRootLogger();
     rootLogger.setLevel(Level.DEBUG);
   }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestFifoScheduler.java

@@ -52,18 +52,27 @@ import org.apache.hadoop.yarn.util.BuilderUtils;
 import org.apache.log4j.Level;
 import org.apache.log4j.LogManager;
 import org.apache.log4j.Logger;
+import org.junit.BeforeClass;
 import org.junit.Test;
 
 public class TestFifoScheduler {
   private static final Log LOG = LogFactory.getLog(TestFifoScheduler.class);
   
   private final int GB = 1024;
+  private static YarnConfiguration conf;
+  
+  @BeforeClass
+  public static void setup() {
+    conf = new YarnConfiguration();
+    conf.setClass(YarnConfiguration.RM_SCHEDULER, 
+        FifoScheduler.class, ResourceScheduler.class);
+  }
   
   @Test
   public void test() throws Exception {
     Logger rootLogger = LogManager.getRootLogger();
     rootLogger.setLevel(Level.DEBUG);
-    MockRM rm = new MockRM();
+    MockRM rm = new MockRM(conf);
     rm.start();
     MockNM nm1 = rm.registerNode("h1:1234", 6 * GB);
     MockNM nm2 = rm.registerNode("h2:5678", 4 * GB);
@@ -178,7 +187,7 @@ public class TestFifoScheduler {
   public void testDefaultMinimumAllocation() throws Exception {
     // Test with something lesser than default
     testMinimumAllocation(
-        new YarnConfiguration(),
+        new YarnConfiguration(TestFifoScheduler.conf),
         YarnConfiguration.DEFAULT_RM_SCHEDULER_MINIMUM_ALLOCATION_MB / 2);
   }
 
@@ -186,7 +195,7 @@ public class TestFifoScheduler {
   public void testNonDefaultMinimumAllocation() throws Exception {
     // Set custom min-alloc to test tweaking it
     int allocMB = 512;
-    YarnConfiguration conf = new YarnConfiguration();
+    YarnConfiguration conf = new YarnConfiguration(TestFifoScheduler.conf);
     conf.setInt(YarnConfiguration.RM_SCHEDULER_MINIMUM_ALLOCATION_MB, allocMB);
     // Test for something lesser than this.
     testMinimumAllocation(conf, allocMB / 2);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestResourceManager.java

@@ -30,6 +30,7 @@ import org.apache.hadoop.net.NetworkTopology;
 import org.apache.hadoop.yarn.api.records.NodeHealthStatus;
 import org.apache.hadoop.yarn.api.records.Priority;
 import org.apache.hadoop.yarn.api.records.Resource;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.server.resourcemanager.recovery.Store;
 import org.apache.hadoop.yarn.server.resourcemanager.recovery.StoreFactory;
 import org.apache.hadoop.yarn.server.resourcemanager.resource.Resources;
@@ -45,7 +46,7 @@ public class TestResourceManager {
   
   @Before
   public void setUp() throws Exception {
-    Configuration conf = new Configuration();
+    Configuration conf = new YarnConfiguration();
     Store store = StoreFactory.getStore(conf);
     resourceManager = new ResourceManager(store);
     resourceManager.init(conf);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestResourceTrackerService.java

@@ -342,10 +342,12 @@ public class TestResourceTrackerService {
     MockNM nm2 = rm.registerNode("host2:5678", 5120);
     nm1.nodeHeartbeat(true);
     nm2.nodeHeartbeat(false);
+    dispatcher.await();
     checkUnealthyNMCount(rm, nm2, true, 1);
     final int expectedNMs = ClusterMetrics.getMetrics().getNumActiveNMs();
     QueueMetrics metrics = rm.getResourceScheduler().getRootQueueMetrics();
-    Assert.assertEquals(5120 + 5120, metrics.getAvailableMB());
+    // TODO Metrics incorrect in case of the FifoScheduler
+    Assert.assertEquals(5120, metrics.getAvailableMB());
 
     // reconnect of healthy node
     nm1 = rm.registerNode("host1:1234", 5120);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/TestFairScheduler.java

@@ -52,6 +52,7 @@ import org.apache.hadoop.yarn.server.resourcemanager.recovery.StoreFactory;
 import org.apache.hadoop.yarn.server.resourcemanager.resource.Resources;
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptState;
 import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNode;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.AppAddedSchedulerEvent;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.AppRemovedSchedulerEvent;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.NodeAddedSchedulerEvent;
@@ -93,7 +94,7 @@ public class TestFairScheduler {
   @Before
   public void setUp() throws IOException {
     scheduler = new FairScheduler();
-    Configuration conf = new Configuration();
+    Configuration conf = createConfiguration();
     // All tests assume only one assignment per node update
     conf.set(FairSchedulerConfiguration.ASSIGN_MULTIPLE, "false");
     Store store = StoreFactory.getStore(conf);
@@ -109,6 +110,13 @@ public class TestFairScheduler {
     resourceManager = null;
   }
 
+  private Configuration createConfiguration() {
+    Configuration conf = new YarnConfiguration();
+    conf.setClass(YarnConfiguration.RM_SCHEDULER, FairScheduler.class,
+        ResourceScheduler.class);
+    return conf;
+  }
+
   private ApplicationAttemptId createAppAttemptId(int appId, int attemptId) {
     ApplicationAttemptId attId = recordFactory.newRecordInstance(ApplicationAttemptId.class);
     ApplicationId appIdImpl = recordFactory.newRecordInstance(ApplicationId.class);
@@ -278,7 +286,7 @@ public class TestFairScheduler {
 
   @Test
   public void testUserAsDefaultQueue() throws Exception {
-    Configuration conf = new Configuration();
+    Configuration conf = createConfiguration();
     conf.set(FairSchedulerConfiguration.USER_AS_DEFAULT_QUEUE, "true");
     scheduler.reinitialize(conf, resourceManager.getRMContext());
     AppAddedSchedulerEvent appAddedEvent = new AppAddedSchedulerEvent(
@@ -299,7 +307,7 @@ public class TestFairScheduler {
 
   @Test
   public void testFairShareWithMinAlloc() throws Exception {
-    Configuration conf = new Configuration();
+    Configuration conf = createConfiguration();
     conf.set(FairSchedulerConfiguration.ALLOCATION_FILE, ALLOC_FILE);
     scheduler.reinitialize(conf, resourceManager.getRMContext());
 
@@ -405,7 +413,7 @@ public class TestFairScheduler {
 
   @Test
   public void testAllocationFileParsing() throws Exception {
-    Configuration conf = new Configuration();
+    Configuration conf = createConfiguration();
     conf.set(FairSchedulerConfiguration.ALLOCATION_FILE, ALLOC_FILE);
     scheduler.reinitialize(conf, resourceManager.getRMContext());
 
@@ -508,7 +516,7 @@ public class TestFairScheduler {
 
   @Test
   public void testBackwardsCompatibleAllocationFileParsing() throws Exception {
-    Configuration conf = new Configuration();
+    Configuration conf = createConfiguration();
     conf.set(FairSchedulerConfiguration.ALLOCATION_FILE, ALLOC_FILE);
     scheduler.reinitialize(conf, resourceManager.getRMContext());
 
@@ -611,7 +619,7 @@ public class TestFairScheduler {
 
   @Test
   public void testIsStarvedForMinShare() throws Exception {
-    Configuration conf = new Configuration();
+    Configuration conf = createConfiguration();
     conf.set(FairSchedulerConfiguration.ALLOCATION_FILE, ALLOC_FILE);
     scheduler.reinitialize(conf, resourceManager.getRMContext());
 
@@ -670,7 +678,7 @@ public class TestFairScheduler {
 
   @Test
   public void testIsStarvedForFairShare() throws Exception {
-    Configuration conf = new Configuration();
+    Configuration conf = createConfiguration();
     conf.set(FairSchedulerConfiguration.ALLOCATION_FILE, ALLOC_FILE);
     scheduler.reinitialize(conf, resourceManager.getRMContext());
 
@@ -734,7 +742,7 @@ public class TestFairScheduler {
    * now this means decreasing order of priority.
    */
   public void testChoiceOfPreemptedContainers() throws Exception {
-    Configuration conf = new Configuration();
+    Configuration conf = createConfiguration();
     conf.set(FairSchedulerConfiguration.ALLOCATION_FILE + ".allocation.file", ALLOC_FILE);
     scheduler.reinitialize(conf, resourceManager.getRMContext());
 
@@ -867,7 +875,7 @@ public class TestFairScheduler {
    * Tests the timing of decision to preempt tasks.
    */
   public void testPreemptionDecision() throws Exception {
-    Configuration conf = new Configuration();
+    Configuration conf = createConfiguration();
     conf.set(FairSchedulerConfiguration.ALLOCATION_FILE, ALLOC_FILE);
     MockClock clock = new MockClock();
     scheduler.setClock(clock);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fifo/TestFifoScheduler.java

@@ -31,6 +31,7 @@ import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.api.records.Priority;
 import org.apache.hadoop.yarn.api.records.QueueInfo;
 import org.apache.hadoop.yarn.api.records.Resource;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.event.AsyncDispatcher;
 import org.apache.hadoop.yarn.server.resourcemanager.Application;
 import org.apache.hadoop.yarn.server.resourcemanager.RMContext;
@@ -43,6 +44,7 @@ import org.apache.hadoop.yarn.server.resourcemanager.resource.Resources;
 import org.apache.hadoop.yarn.server.resourcemanager.resourcetracker.InlineDispatcher;
 import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNode;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.QueueMetrics;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.AppAddedSchedulerEvent;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.SchedulerEvent;
 import org.apache.hadoop.yarn.util.BuilderUtils;
@@ -59,7 +61,10 @@ public class TestFifoScheduler {
   public void setUp() throws Exception {
     Store store = StoreFactory.getStore(new Configuration());
     resourceManager = new ResourceManager(store);
-    resourceManager.init(new Configuration());
+    Configuration conf = new Configuration();
+    conf.setClass(YarnConfiguration.RM_SCHEDULER, 
+        FifoScheduler.class, ResourceScheduler.class);
+    resourceManager.init(conf);
   }
 
   @After

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServices.java

@@ -38,6 +38,7 @@ import org.apache.hadoop.yarn.server.resourcemanager.RMContext;
 import org.apache.hadoop.yarn.server.resourcemanager.ResourceManager;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.QueueMetrics;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceScheduler;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fifo.FifoScheduler;
 import org.apache.hadoop.yarn.server.security.ApplicationACLsManager;
 import org.apache.hadoop.yarn.service.Service.STATE;
 import org.apache.hadoop.yarn.util.YarnVersionInfo;
@@ -74,7 +75,10 @@ public class TestRMWebServices extends JerseyTest {
       bind(JAXBContextResolver.class);
       bind(RMWebServices.class);
       bind(GenericExceptionHandler.class);
-      rm = new MockRM(new Configuration());
+      Configuration conf = new Configuration();
+      conf.setClass(YarnConfiguration.RM_SCHEDULER, FifoScheduler.class,
+          ResourceScheduler.class);
+      rm = new MockRM(conf);
       bind(ResourceManager.class).toInstance(rm);
       bind(RMContext.class).toInstance(rm.getRMContext());
       bind(ApplicationACLsManager.class).toInstance(

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServicesApps.java

@@ -45,6 +45,8 @@ import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppEventType;
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppFailedAttemptEvent;
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppState;
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttempt;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceScheduler;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fifo.FifoScheduler;
 import org.apache.hadoop.yarn.server.security.ApplicationACLsManager;
 import org.apache.hadoop.yarn.webapp.GenericExceptionHandler;
 import org.apache.hadoop.yarn.webapp.WebServicesTestUtils;
@@ -82,6 +84,8 @@ public class TestRMWebServicesApps extends JerseyTest {
       bind(GenericExceptionHandler.class);
       Configuration conf = new Configuration();
       conf.setInt(YarnConfiguration.RM_AM_MAX_RETRIES, 2);
+      conf.setClass(YarnConfiguration.RM_SCHEDULER, FifoScheduler.class,
+          ResourceScheduler.class);
       rm = new MockRM(conf);
       bind(ResourceManager.class).toInstance(rm);
       bind(RMContext.class).toInstance(rm.getRMContext());

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-tests/src/test/java/org/apache/hadoop/yarn/server/MiniYARNCluster.java

@@ -102,6 +102,12 @@ public class MiniYARNCluster extends CompositeService {
       nodeManagers[index] = new CustomNodeManager();
     }
   }
+  
+  @Override
+  public void init(Configuration conf) {
+    super.init(conf instanceof YarnConfiguration ? conf
+        : new YarnConfiguration(conf));
+  }
 
   public File getTestWorkDir() {
     return testWorkDir;
@@ -201,7 +207,7 @@ public class MiniYARNCluster extends CompositeService {
     }
 
     public synchronized void init(Configuration conf) {                          
-      Configuration config = new Configuration(conf);                            
+      Configuration config = new YarnConfiguration(conf);                            
       super.init(config);                                                        
     }