diff --git a/hadoop-yarn-project/CHANGES.txt b/hadoop-yarn-project/CHANGES.txt
index b5e850e4637..bcbf445787f 100644
--- a/hadoop-yarn-project/CHANGES.txt
+++ b/hadoop-yarn-project/CHANGES.txt
@@ -27,6 +27,9 @@ Release 2.8.0 - UNRELEASED
     YARN-3361. CapacityScheduler side changes to support non-exclusive node
     labels. (Wangda Tan via jianhe)
 
+    YARN-3318. Create Initial OrderingPolicy Framework and FifoOrderingPolicy.
+    (Craig Welch via wangda)
+
   IMPROVEMENTS
 
     YARN-1880. Cleanup TestApplicationClientProtocolOnHA
diff --git a/hadoop-yarn-project/hadoop-yarn/dev-support/findbugs-exclude.xml b/hadoop-yarn-project/hadoop-yarn/dev-support/findbugs-exclude.xml
index 375d19c1c2d..4b01a4d5448 100644
--- a/hadoop-yarn-project/hadoop-yarn/dev-support/findbugs-exclude.xml
+++ b/hadoop-yarn-project/hadoop-yarn/dev-support/findbugs-exclude.xml
@@ -140,6 +140,10 @@
   <Match>
     <Class name="org.apache.hadoop.yarn.server.resourcemanager.resource.Priority$Comparator" />
     <Bug pattern="SE_COMPARATOR_SHOULD_BE_SERIALIZABLE" />
+  </Match>
+    <Match>
+    <Class name="org.apache.hadoop.yarn.server.resourcemanager.scheduler.policy.FifoComparator" />
+    <Bug pattern="SE_COMPARATOR_SHOULD_BE_SERIALIZABLE" />
   </Match>
   <!-- Ignore some irrelevant class name warning -->
   <Match>
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/ResourceUsage.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/ResourceUsage.java
index 5169b78dd58..2f7e19dd2cb 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/ResourceUsage.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/ResourceUsage.java
@@ -57,7 +57,10 @@ public class ResourceUsage {
 
   // Usage enum here to make implement cleaner
   private enum ResourceType {
-    USED(0), PENDING(1), AMUSED(2), RESERVED(3);
+    //CACHED_USED and CACHED_PENDING may be read by anyone, but must only
+    //be written by ordering policies
+    USED(0), PENDING(1), AMUSED(2), RESERVED(3), CACHED_USED(4),
+      CACHED_PENDING(5);
 
     private int idx;
 
@@ -102,6 +105,14 @@ public class ResourceUsage {
   public Resource getUsed(String label) {
     return _get(label, ResourceType.USED);
   }
+  
+  public Resource getCachedUsed(String label) {
+    return _get(label, ResourceType.CACHED_USED);
+  }
+  
+  public Resource getCachedPending(String label) {
+    return _get(label, ResourceType.CACHED_PENDING);
+  }
 
   public void incUsed(String label, Resource res) {
     _inc(label, ResourceType.USED, res);
@@ -137,6 +148,14 @@ public class ResourceUsage {
   public void setUsed(String label, Resource res) {
     _set(label, ResourceType.USED, res);
   }
+  
+  public void setCachedUsed(String label, Resource res) {
+    _set(label, ResourceType.CACHED_USED, res);
+  }
+  
+  public void setCachedPending(String label, Resource res) {
+    _set(label, ResourceType.CACHED_PENDING, res);
+  }
 
   /*
    * Pending
@@ -266,6 +285,28 @@ public class ResourceUsage {
       readLock.unlock();
     }
   }
+  
+  private Resource _getAll(ResourceType type) {
+    try {
+      readLock.lock();
+      Resource allOfType = Resources.createResource(0);
+      for (Map.Entry<String, UsageByLabel> usageEntry : usages.entrySet()) {
+        //all usages types are initialized
+        Resources.addTo(allOfType, usageEntry.getValue().resArr[type.idx]);
+      }
+      return allOfType;
+    } finally {
+      readLock.unlock();
+    }
+  }
+  
+  public Resource getAllPending() {
+    return _getAll(ResourceType.PENDING);
+  }
+  
+  public Resource getAllUsed() {
+    return _getAll(ResourceType.USED);
+  }
 
   private UsageByLabel getAndAddIfMissing(String label) {
     if (label == null) {
@@ -309,6 +350,18 @@ public class ResourceUsage {
       writeLock.unlock();
     }
   }
+
+  public Resource getCachedDemand(String label) {
+    try {
+      readLock.lock();
+      Resource demand = Resources.createResource(0);
+      Resources.addTo(demand, getCachedUsed(label));
+      Resources.addTo(demand, getCachedPending(label));
+      return demand;
+    } finally {
+      readLock.unlock();
+    }
+  }
   
   @Override
   public String toString() {
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/AbstractComparatorOrderingPolicy.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/AbstractComparatorOrderingPolicy.java
new file mode 100644
index 00000000000..5b32b3dee8d
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/AbstractComparatorOrderingPolicy.java
@@ -0,0 +1,119 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.yarn.server.resourcemanager.scheduler.policy;
+
+import java.util.*;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainer;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.*;
+import org.apache.hadoop.yarn.nodelabels.CommonNodeLabelsManager;
+import com.google.common.annotations.VisibleForTesting;
+
+
+/**
+ * An OrderingPolicy which can serve as a baseclass for policies which can be
+ * expressed in terms of comparators
+ */
+public abstract class AbstractComparatorOrderingPolicy<S extends SchedulableEntity> implements OrderingPolicy<S> {
+  
+  private static final Log LOG = LogFactory.getLog(OrderingPolicy.class);
+                                            
+  protected TreeSet<S> schedulableEntities;
+  protected Comparator<SchedulableEntity> comparator;
+  
+  public AbstractComparatorOrderingPolicy() { }
+  
+  @Override
+  public Collection<S> getSchedulableEntities() {
+    return schedulableEntities;
+  }
+  
+  @Override
+  public Iterator<S> getAssignmentIterator() {
+    return schedulableEntities.iterator();
+  }
+  
+  @Override
+  public Iterator<S> getPreemptionIterator() {
+    return schedulableEntities.descendingIterator();
+  }
+  
+  public static void updateSchedulingResourceUsage(ResourceUsage ru) {
+    ru.setCachedUsed(CommonNodeLabelsManager.ANY, ru.getAllUsed());
+    ru.setCachedPending(CommonNodeLabelsManager.ANY, ru.getAllPending());
+  }
+  
+  protected void reorderSchedulableEntity(S schedulableEntity) {
+    //remove, update comparable data, and reinsert to update position in order
+    schedulableEntities.remove(schedulableEntity);
+    updateSchedulingResourceUsage(
+      schedulableEntity.getSchedulingResourceUsage());
+    schedulableEntities.add(schedulableEntity);
+  }
+  
+  public void setComparator(Comparator<SchedulableEntity> comparator) {
+    this.comparator = comparator;
+    TreeSet<S> schedulableEntities = new TreeSet<S>(comparator);
+    if (this.schedulableEntities != null) {
+      schedulableEntities.addAll(this.schedulableEntities);
+    }
+    this.schedulableEntities = schedulableEntities;
+  }
+  
+  @VisibleForTesting
+  public Comparator<SchedulableEntity> getComparator() {
+    return comparator; 
+  }
+  
+  @Override
+  public void addSchedulableEntity(S s) {
+    schedulableEntities.add(s); 
+  }
+  
+  @Override
+  public boolean removeSchedulableEntity(S s) {
+    return schedulableEntities.remove(s); 
+  }
+  
+  @Override
+  public void addAllSchedulableEntities(Collection<S> sc) {
+    schedulableEntities.addAll(sc);
+  }
+  
+  @Override
+  public int getNumSchedulableEntities() {
+    return schedulableEntities.size(); 
+  }
+  
+  @Override
+  public abstract void configure(String conf);
+  
+  @Override
+  public abstract void containerAllocated(S schedulableEntity, 
+    RMContainer r);
+  
+  @Override
+  public abstract void containerReleased(S schedulableEntity, 
+    RMContainer r);
+  
+  @Override
+  public abstract String getStatusMessage();
+  
+}
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/FifoComparator.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/FifoComparator.java
new file mode 100644
index 00000000000..b92b2644c28
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/FifoComparator.java
@@ -0,0 +1,37 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.yarn.server.resourcemanager.scheduler.policy;
+
+import java.util.*;
+import org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainer;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.*;
+
+/**
+ * A Comparator which orders SchedulableEntities by input order
+ */
+public class FifoComparator 
+    implements Comparator<SchedulableEntity> {
+      
+    @Override
+    public int compare(SchedulableEntity r1, SchedulableEntity r2) {
+      int res = r1.compareInputOrderTo(r2);
+      return res;
+    }
+}
+
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/FifoOrderingPolicy.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/FifoOrderingPolicy.java
new file mode 100644
index 00000000000..8a2f5ba11ed
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/FifoOrderingPolicy.java
@@ -0,0 +1,54 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.yarn.server.resourcemanager.scheduler.policy;
+
+import java.util.*;
+import org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainer;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.*;
+
+/**
+ * An OrderingPolicy which orders SchedulableEntities by input order
+ */
+public class FifoOrderingPolicy<S extends SchedulableEntity> extends AbstractComparatorOrderingPolicy<S> {
+  
+  public FifoOrderingPolicy() {
+    setComparator(new FifoComparator());
+  }
+  
+  @Override
+  public void configure(String conf) {
+    
+  }
+  
+  @Override
+  public void containerAllocated(S schedulableEntity, 
+    RMContainer r) {
+    }
+
+  @Override
+  public void containerReleased(S schedulableEntity, 
+    RMContainer r) {
+    }
+  
+  @Override
+  public String getStatusMessage() {
+    return "FifoOrderingPolicy";
+  }
+  
+}
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/OrderingPolicy.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/OrderingPolicy.java
new file mode 100644
index 00000000000..f907cea2001
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/OrderingPolicy.java
@@ -0,0 +1,109 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.yarn.server.resourcemanager.scheduler.policy;
+
+import java.util.*;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainer;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.*;
+
+
+/**
+ * OrderingPolicy is used by the scheduler to order SchedulableEntities for
+ * container assignment and preemption
+ */
+public interface OrderingPolicy<S extends SchedulableEntity> {
+  /*
+   * Note: OrderingPolicy depends upon external
+   * synchronization of all use of the SchedulableEntity Collection and
+   * Iterators for correctness and to avoid concurrent modification issues
+   */
+  
+  /**
+   * Get the collection of SchedulableEntities which are managed by this
+   * OrderingPolicy - should include processes returned by the Assignment and
+   * Preemption iterator with no guarantees regarding order
+   */
+  public Collection<S> getSchedulableEntities();
+  
+  /**
+   * Return an iterator over the collection of SchedulableEntities which orders
+   * them for container assignment
+   */
+  public Iterator<S> getAssignmentIterator();
+  
+  /**
+   * Return an iterator over the collection of SchedulableEntities which orders
+   * them for preemption
+   */
+  public Iterator<S> getPreemptionIterator();
+  
+  /**
+   * Add a SchedulableEntity to be managed for allocation and preemption 
+   * ordering
+   */
+  public void addSchedulableEntity(S s);
+  
+  /**
+   * Remove a SchedulableEntity from management for allocation and preemption 
+   * ordering
+   */
+  public boolean removeSchedulableEntity(S s);
+  
+  /**
+   * Add a collection of SchedulableEntities to be managed for allocation 
+   * and preemption ordering
+   */
+  public void addAllSchedulableEntities(Collection<S> sc);
+  
+  /**
+   * Get the number of SchedulableEntities managed for allocation and
+   * preemption ordering
+   */
+  public int getNumSchedulableEntities();
+  
+  /**
+   * Provides configuration information for the policy from the scheduler
+   * configuration
+   */
+  public void configure(String conf);
+  
+  /**
+   * The passed SchedulableEntity has been allocated the passed Container,
+   * take appropriate action (depending on comparator, a reordering of the
+   * SchedulableEntity may be required)
+   */
+  public void containerAllocated(S schedulableEntity, 
+    RMContainer r);
+  
+  /**
+   * The passed SchedulableEntity has released the passed Container,
+   * take appropriate action (depending on comparator, a reordering of the
+   * SchedulableEntity may be required)
+   */
+  public void containerReleased(S schedulableEntity, 
+    RMContainer r);
+  
+  /**
+   * Display information regarding configuration & status
+   */
+  public String getStatusMessage();
+  
+}
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/SchedulableEntity.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/SchedulableEntity.java
new file mode 100644
index 00000000000..9b9d73d920c
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/SchedulableEntity.java
@@ -0,0 +1,51 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.yarn.server.resourcemanager.scheduler.policy;
+
+import java.util.*;
+
+import org.apache.hadoop.yarn.api.records.Priority;
+import org.apache.hadoop.yarn.api.records.Resource;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceUsage;
+
+
+/**
+ * A SchedulableEntity is a process to be scheduled, 
+ * for example, an application / application attempt
+ */
+public interface SchedulableEntity {
+  
+  /**
+   * Id - each entity must have a unique id
+   */
+  public String getId();
+  
+  /**
+   * Compare the passed SchedulableEntity to this one for input order.
+   * Input order is implementation defined and should reflect the 
+   * correct ordering for first-in first-out processing
+   */
+  public int compareInputOrderTo(SchedulableEntity other);
+  
+  /**
+   * View of Resources wanted and consumed by the entity
+   */
+  public ResourceUsage getSchedulingResourceUsage();
+  
+}
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/MockSchedulableEntity.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/MockSchedulableEntity.java
new file mode 100644
index 00000000000..fe8c455cdf8
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/MockSchedulableEntity.java
@@ -0,0 +1,78 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.yarn.server.resourcemanager.scheduler.policy;
+
+import java.util.*;
+
+import org.apache.hadoop.yarn.api.records.Priority;
+import org.apache.hadoop.yarn.api.records.Resource;
+import org.apache.hadoop.yarn.util.resource.Resources;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceUsage;
+import org.apache.hadoop.yarn.nodelabels.CommonNodeLabelsManager;
+
+
+public class MockSchedulableEntity implements SchedulableEntity {
+  
+  private String id;
+  private long serial = 0;
+  
+  public MockSchedulableEntity() { }
+  
+  public void setId(String id) {
+    this.id = id;
+  }
+
+  public String getId() {
+    return id;
+  }
+  
+  public void setSerial(long serial) {
+    this.serial = serial;
+  }
+  
+  public long getSerial() {
+    return serial; 
+  }
+  
+  public void setUsed(Resource value) {
+    schedulingResourceUsage.setUsed(CommonNodeLabelsManager.ANY, value);
+  }
+  
+  public void setPending(Resource value) {
+    schedulingResourceUsage.setPending(CommonNodeLabelsManager.ANY, value);
+  }
+  
+  private ResourceUsage schedulingResourceUsage = new ResourceUsage();
+  
+  @Override
+  public ResourceUsage getSchedulingResourceUsage() {
+    return schedulingResourceUsage;
+  }
+  
+  @Override
+  public int compareInputOrderTo(SchedulableEntity other) {
+    if (other instanceof MockSchedulableEntity) {
+      MockSchedulableEntity r2 = (MockSchedulableEntity) other;
+      int res = (int) Math.signum(getSerial() - r2.getSerial());
+      return res;
+    }
+    return 1;//let other types go before this, if any
+  }
+  
+}
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/TestFifoOrderingPolicy.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/TestFifoOrderingPolicy.java
new file mode 100644
index 00000000000..e05ef261024
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/policy/TestFifoOrderingPolicy.java
@@ -0,0 +1,83 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.yarn.server.resourcemanager.scheduler.policy;
+
+import java.util.*;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import org.apache.hadoop.yarn.api.records.Priority;
+import org.apache.hadoop.yarn.api.records.Resource;
+import org.apache.hadoop.yarn.util.resource.Resources;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration;
+
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerApp;
+
+public class TestFifoOrderingPolicy {
+  
+  @Test
+  public void testFifoOrderingPolicy() {
+    FifoOrderingPolicy<MockSchedulableEntity> policy = 
+      new FifoOrderingPolicy<MockSchedulableEntity>();
+    MockSchedulableEntity r1 = new MockSchedulableEntity();
+    MockSchedulableEntity r2 = new MockSchedulableEntity();
+    
+    Assert.assertEquals(policy.getComparator().compare(r1, r2), 0);
+    
+    r1.setSerial(1);
+    Assert.assertEquals(policy.getComparator().compare(r1, r2), 1);
+    
+    r2.setSerial(2);
+    Assert.assertEquals(policy.getComparator().compare(r1, r2), -1);
+  }
+  
+  @Test
+  public void testIterators() {
+    OrderingPolicy<MockSchedulableEntity> schedOrder =
+     new FifoOrderingPolicy<MockSchedulableEntity>();
+    
+    MockSchedulableEntity msp1 = new MockSchedulableEntity();
+    MockSchedulableEntity msp2 = new MockSchedulableEntity();
+    MockSchedulableEntity msp3 = new MockSchedulableEntity();
+    
+    msp1.setSerial(3);
+    msp2.setSerial(2);
+    msp3.setSerial(1);
+    
+    schedOrder.addSchedulableEntity(msp1);
+    schedOrder.addSchedulableEntity(msp2);
+    schedOrder.addSchedulableEntity(msp3);
+    
+    //Assignment, oldest to youngest
+    checkSerials(schedOrder.getAssignmentIterator(), new long[]{1, 2, 3});
+    
+    //Preemption, youngest to oldest
+    checkSerials(schedOrder.getPreemptionIterator(), new long[]{3, 2, 1});
+  }
+  
+  public void checkSerials(Iterator<MockSchedulableEntity> si, 
+      long[] serials) {
+    for (int i = 0;i < serials.length;i++) {
+      Assert.assertEquals(si.next().getSerial(), 
+        serials[i]);
+    }
+  }
+  
+}