YARN-7438. Additional changes to make SchedulingPlacementSet agnostic to ResourceRequest / placement algorithm. Contributed by Wangda Tan

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

@@ -31,6 +31,7 @@
 import org.apache.hadoop.yarn.api.records.Resource;
 import org.apache.hadoop.yarn.api.records.ResourceRequest;
 import org.apache.hadoop.yarn.event.EventHandler;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.ContainerRequest;
 import org.apache.hadoop.yarn.server.scheduler.SchedulerRequestKey;
 
 
@@ -87,7 +88,7 @@ public interface RMContainer extends EventHandler<RMContainerEvent>,
   
   boolean isAMContainer();
 
-  List<ResourceRequest> getResourceRequests();
+  ContainerRequest getContainerRequest();
 
   String getNodeHttpAddress();
   

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

@@ -52,6 +52,7 @@
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.event.RMAppAttemptContainerFinishedEvent;
 import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeCleanContainerEvent;
 import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeUpdateContainerEvent;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.ContainerRequest;
 import org.apache.hadoop.yarn.server.scheduler.SchedulerRequestKey;
 import org.apache.hadoop.yarn.state.InvalidStateTransitionException;
 import org.apache.hadoop.yarn.state.MultipleArcTransition;
@@ -178,7 +179,7 @@ RMContainerEventType.RESERVED, new ContainerReservedTransition())
   private long finishTime;
   private ContainerStatus finishedStatus;
   private boolean isAMContainer;
-  private List<ResourceRequest> resourceRequests;
+  private ContainerRequest containerRequestForRecovery;
 
   // Only used for container resource increase and decrease. This is the
   // resource to rollback to should container resource increase token expires.
@@ -233,7 +234,6 @@ public RMContainerImpl(Container container, SchedulerRequestKey schedulerKey,
     this.eventHandler = rmContext.getDispatcher().getEventHandler();
     this.containerAllocationExpirer = rmContext.getContainerAllocationExpirer();
     this.isAMContainer = false;
-    this.resourceRequests = null;
     this.nodeLabelExpression = nodeLabelExpression;
     this.lastConfirmedResource = container.getResource();
     this.isExternallyAllocated = isExternallyAllocated;
@@ -414,19 +414,19 @@ public ContainerState getContainerState() {
   }
 
   @Override
-  public List<ResourceRequest> getResourceRequests() {
+  public ContainerRequest getContainerRequest() {
     try {
       readLock.lock();
-      return resourceRequests;
+      return containerRequestForRecovery;
     } finally {
       readLock.unlock();
     }
   }
 
-  public void setResourceRequests(List<ResourceRequest> requests) {
-    try {
+  public void setContainerRequest(ContainerRequest request) {
     writeLock.lock();
-      this.resourceRequests = requests;
+    try {
+      this.containerRequestForRecovery = request;
     } finally {
       writeLock.unlock();
     }
@@ -576,7 +576,7 @@ private static final class AcquiredTransition extends BaseTransition {
     public void transition(RMContainerImpl container, RMContainerEvent event) {
       // Clear ResourceRequest stored in RMContainer, we don't need to remember
       // this anymore.
-      container.setResourceRequests(null);
+      container.setContainerRequest(null);
       
       // Register with containerAllocationExpirer.
       container.containerAllocationExpirer.register(

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

@@ -86,6 +86,7 @@
 import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeResourceUpdateEvent;
 import org.apache.hadoop.yarn.server.resourcemanager.rmnode.UpdatedContainerInfo;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.activities.ActivitiesManager;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.ContainerRequest;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.QueueEntitlement;
 
 
@@ -600,10 +601,10 @@ private RMContainer recoverAndCreateContainer(NMContainerStatus status,
    * @param rmContainer rmContainer
    */
   private void recoverResourceRequestForContainer(RMContainer rmContainer) {
-    List<ResourceRequest> requests = rmContainer.getResourceRequests();
+    ContainerRequest containerRequest = rmContainer.getContainerRequest();
 
     // If container state is moved to ACQUIRED, request will be empty.
-    if (requests == null) {
+    if (containerRequest == null) {
       return;
     }
 
@@ -618,7 +619,7 @@ private void recoverResourceRequestForContainer(RMContainer rmContainer) {
     SchedulerApplicationAttempt schedulerAttempt =
         getCurrentAttemptForContainer(rmContainer.getContainerId());
     if (schedulerAttempt != null) {
-      schedulerAttempt.recoverResourceRequestsForContainer(requests);
+      schedulerAttempt.recoverResourceRequestsForContainer(containerRequest);
     }
   }
 

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

@@ -45,10 +45,11 @@
 import org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainer;
 import org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainerState;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.SchedulingMode;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.ContainerRequest;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.PendingAsk;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.placement.AppPlacementAllocator;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.placement.LocalityAppPlacementAllocator;
-import org.apache.hadoop.yarn.server.resourcemanager.scheduler.placement.ResourceRequestUpdateResult;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.placement.PendingAskUpdateResult;
 import org.apache.hadoop.yarn.server.scheduler.SchedulerRequestKey;
 import org.apache.hadoop.yarn.util.resource.Resources;
 /**
@@ -220,16 +221,14 @@ boolean addRequestToAppPlacement(
       }
 
       // Update AppPlacementAllocator
-      ResourceRequestUpdateResult pendingAmountChanges =
+      PendingAskUpdateResult pendingAmountChanges =
           schedulerKeyToAppPlacementAllocator.get(schedulerRequestKey)
-              .updateResourceRequests(
-                  entry.getValue().values(),
+              .updatePendingAsk(entry.getValue().values(),
                   recoverPreemptedRequestForAContainer);
 
       if (null != pendingAmountChanges) {
         updatePendingResources(
-            pendingAmountChanges.getLastAnyResourceRequest(),
-            pendingAmountChanges.getNewResourceRequest(), schedulerRequestKey,
+            pendingAmountChanges, schedulerRequestKey,
             queue.getMetrics());
         offswitchResourcesUpdated = true;
       }
@@ -237,12 +236,17 @@ boolean addRequestToAppPlacement(
     return offswitchResourcesUpdated;
   }
 
-  private void updatePendingResources(ResourceRequest lastRequest,
-      ResourceRequest request, SchedulerRequestKey schedulerKey,
-      QueueMetrics metrics) {
+  private void updatePendingResources(PendingAskUpdateResult updateResult,
+      SchedulerRequestKey schedulerKey, QueueMetrics metrics) {
+
+    PendingAsk lastPendingAsk = updateResult.getLastPendingAsk();
+    PendingAsk newPendingAsk = updateResult.getNewPendingAsk();
+    String lastNodePartition = updateResult.getLastNodePartition();
+    String newNodePartition = updateResult.getNewNodePartition();
+
     int lastRequestContainers =
-        (lastRequest != null) ? lastRequest.getNumContainers() : 0;
-    if (request.getNumContainers() <= 0) {
+        (lastPendingAsk != null) ? lastPendingAsk.getCount() : 0;
+    if (newPendingAsk.getCount() <= 0) {
       if (lastRequestContainers >= 0) {
         schedulerKeys.remove(schedulerKey);
         schedulerKeyToAppPlacementAllocator.remove(schedulerKey);
@@ -258,31 +262,23 @@ private void updatePendingResources(ResourceRequest lastRequest,
       }
     }
 
-    Resource lastRequestCapability =
-        lastRequest != null ? lastRequest.getCapability() : Resources.none();
-    metrics.incrPendingResources(request.getNodeLabelExpression(), user,
-        request.getNumContainers(), request.getCapability());
-
-    if(lastRequest != null) {
-      metrics.decrPendingResources(lastRequest.getNodeLabelExpression(), user,
-          lastRequestContainers, lastRequestCapability);
+    if (lastPendingAsk != null) {
+      // Deduct resources from metrics / pending resources of queue/app.
+      metrics.decrPendingResources(lastNodePartition, user,
+          lastPendingAsk.getCount(), lastPendingAsk.getPerAllocationResource());
+      Resource decreasedResource = Resources.multiply(
+          lastPendingAsk.getPerAllocationResource(), lastRequestContainers);
+      queue.decPendingResource(lastNodePartition, decreasedResource);
+      appResourceUsage.decPending(lastNodePartition, decreasedResource);
     }
 
-    // update queue:
-    Resource increasedResource =
-        Resources.multiply(request.getCapability(), request.getNumContainers());
-    queue.incPendingResource(request.getNodeLabelExpression(),
-        increasedResource);
-    appResourceUsage.incPending(request.getNodeLabelExpression(),
-        increasedResource);
-    if (lastRequest != null) {
-      Resource decreasedResource =
-          Resources.multiply(lastRequestCapability, lastRequestContainers);
-      queue.decPendingResource(lastRequest.getNodeLabelExpression(),
-          decreasedResource);
-      appResourceUsage.decPending(lastRequest.getNodeLabelExpression(),
-          decreasedResource);
-    }
+    // Increase resources to metrics / pending resources of queue/app.
+    metrics.incrPendingResources(newNodePartition, user,
+        newPendingAsk.getCount(), newPendingAsk.getPerAllocationResource());
+    Resource increasedResource = Resources.multiply(
+        newPendingAsk.getPerAllocationResource(), newPendingAsk.getCount());
+    queue.incPendingResource(newNodePartition, increasedResource);
+    appResourceUsage.incPending(newNodePartition, increasedResource);
   }
 
   public void addRequestedPartition(String partition) {
@@ -417,7 +413,7 @@ public boolean isPlaceBlacklisted(String resourceName,
     }
   }
 
-  public List<ResourceRequest> allocate(NodeType type,
+  public ContainerRequest allocate(NodeType type,
       SchedulerNode node, SchedulerRequestKey schedulerKey,
       Container containerAllocated) {
     try {

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

@@ -34,6 +34,7 @@
 import org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainer;
 import org.apache.hadoop.yarn.server.resourcemanager.rmcontainer
     .RMContainerImpl;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.PendingAsk;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.placement.AppPlacementAllocator;
 import org.apache.hadoop.yarn.server.scheduler.SchedulerRequestKey;
 import org.apache.hadoop.yarn.util.resource.Resources;
@@ -155,16 +156,16 @@ private void cancelPreviousRequest(SchedulerNode schedulerNode,
     AppPlacementAllocator<SchedulerNode> appPlacementAllocator =
         appSchedulingInfo.getAppPlacementAllocator(schedulerKey);
     if (appPlacementAllocator != null) {
-      Map<String, ResourceRequest> resourceRequests = appPlacementAllocator
-          .getResourceRequests();
-      ResourceRequest prevReq = resourceRequests.get(ResourceRequest.ANY);
+      PendingAsk pendingAsk = appPlacementAllocator.getPendingAsk(
+          ResourceRequest.ANY);
       // Decrement the pending using a dummy RR with
       // resource = prev update req capability
-      if (prevReq != null) {
+      if (pendingAsk != null && pendingAsk.getCount() > 0) {
         appSchedulingInfo.allocate(NodeType.OFF_SWITCH, schedulerNode,
             schedulerKey, Container.newInstance(UNDEFINED,
                 schedulerNode.getNodeID(), "host:port",
-                prevReq.getCapability(), schedulerKey.getPriority(), null));
+                pendingAsk.getPerAllocationResource(),
+                schedulerKey.getPriority(), null));
       }
     }
   }

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

@@ -76,6 +76,7 @@
 import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeCleanContainerEvent;
 import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeUpdateContainerEvent;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.SchedulingMode;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.ContainerRequest;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.PendingAsk;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.placement.AppPlacementAllocator;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.policy.SchedulableEntity;
@@ -449,11 +450,12 @@ public boolean updateResourceRequests(
   }
   
   public void recoverResourceRequestsForContainer(
-      List<ResourceRequest> requests) {
+      ContainerRequest containerRequest) {
     try {
       writeLock.lock();
       if (!isStopped) {
-        appSchedulingInfo.updateResourceRequests(requests, true);
+        appSchedulingInfo.updateResourceRequests(
+            containerRequest.getResourceRequests(), true);
       }
     } finally {
       writeLock.unlock();
@@ -913,7 +915,7 @@ private List<Container> pullNewlyUpdatedContainers(
         RMContainer c = tempIter.next();
         // Mark container for release (set RRs to null, so RM does not think
         // it is a recoverable container)
-        ((RMContainerImpl) c).setResourceRequests(null);
+        ((RMContainerImpl) c).setContainerRequest(null);
 
         // Release this container async-ly so as to prevent
         // 'LeafQueue::completedContainer()' from trying to acquire a lock
@@ -1383,13 +1385,6 @@ public <N extends SchedulerNode> AppPlacementAllocator<N> getAppPlacementAllocat
       SchedulerRequestKey schedulerRequestKey) {
     return appSchedulingInfo.getAppPlacementAllocator(schedulerRequestKey);
   }
-
-  public Map<String, ResourceRequest> getResourceRequests(
-      SchedulerRequestKey schedulerRequestKey) {
-    return appSchedulingInfo.getAppPlacementAllocator(schedulerRequestKey)
-        .getResourceRequests();
-  }
-
   public void incUnconfirmedRes(Resource res) {
     unconfirmedAllocatedMem.addAndGet(res.getMemorySize());
     unconfirmedAllocatedVcores.addAndGet(res.getVirtualCores());

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/allocator/RegularContainerAllocator.java

@@ -299,7 +299,8 @@ private boolean canAssign(SchedulerRequestKey schedulerKey,
       }
       // If we have only ANY requests for this schedulerKey, we should not
       // delay its scheduling.
-      if (application.getResourceRequests(schedulerKey).size() == 1) {
+      if (application.getAppPlacementAllocator(schedulerKey)
+          .getUniqueLocationAsks() == 1) {
         return true;
       }
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/common/ContainerRequest.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.common;
+
+import org.apache.hadoop.yarn.api.records.ResourceRequest;
+
+import java.util.List;
+
+/**
+ * ContainerRequest is a class to capture resource requests associated with a
+ * Container, this will be used by scheduler to recover resource requests if the
+ * container preempted or cancelled before AM acquire the container.
+ *
+ * It should include deducted resource requests when the container allocated.
+ *
+ * Lifecycle of the ContainerRequest is:
+ *
+ * <pre>
+ * 1) It is instantiated when container created.
+ * 2) It will be set to ContainerImpl by scheduler.
+ * 3) When container preempted or cancelled because of whatever reason before
+ *    container acquired by AM. ContainerRequest will be added back to pending
+ *    request pool.
+ * 4) It will be cleared from ContainerImpl if the container already acquired by
+ *    AM.
+ * </pre>
+ */
+public class ContainerRequest {
+  private List<ResourceRequest> requests;
+
+  public ContainerRequest(List<ResourceRequest> requests) {
+    this.requests = requests;
+  }
+
+  public List<ResourceRequest> getResourceRequests() {
+    return requests;
+  }
+}

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/common/fica/FiCaSchedulerApp.java

@@ -73,6 +73,7 @@
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.allocator.AbstractContainerAllocator;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.allocator.ContainerAllocator;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.ContainerAllocationProposal;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.ContainerRequest;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.PendingAsk;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.ResourceCommitRequest;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.SchedulerContainer;
@@ -369,7 +370,7 @@ private boolean commonCheckContainerAllocation(
 
   public boolean accept(Resource cluster,
       ResourceCommitRequest<FiCaSchedulerApp, FiCaSchedulerNode> request) {
-    List<ResourceRequest> resourceRequests = null;
+    ContainerRequest containerRequest = null;
     boolean reReservation = false;
 
     try {
@@ -397,8 +398,8 @@ public boolean accept(Resource cluster,
 
         if (schedulerContainer.isAllocated()) {
           // When allocate a new container
-          resourceRequests =
-              schedulerContainer.getRmContainer().getResourceRequests();
+          containerRequest =
+              schedulerContainer.getRmContainer().getContainerRequest();
 
           // Check pending resource request
           if (!appSchedulingInfo.checkAllocation(allocation.getAllocationLocalityType(),
@@ -471,8 +472,8 @@ public boolean accept(Resource cluster,
     }
 
     // When rejected, recover resource requests for this app
-    if (!accepted && resourceRequests != null) {
-      recoverResourceRequestsForContainer(resourceRequests);
+    if (!accepted && containerRequest != null) {
+      recoverResourceRequestsForContainer(containerRequest);
     }
 
     return accepted;
@@ -524,12 +525,12 @@ public void apply(Resource cluster,
           liveContainers.put(containerId, rmContainer);
 
           // Deduct pending resource requests
-          List<ResourceRequest> requests = appSchedulingInfo.allocate(
+          ContainerRequest containerRequest = appSchedulingInfo.allocate(
               allocation.getAllocationLocalityType(),
               schedulerContainer.getSchedulerNode(),
               schedulerContainer.getSchedulerRequestKey(),
               schedulerContainer.getRmContainer().getContainer());
-          ((RMContainerImpl) rmContainer).setResourceRequests(requests);
+          ((RMContainerImpl) rmContainer).setContainerRequest(containerRequest);
 
           attemptResourceUsage.incUsed(schedulerContainer.getNodePartition(),
               allocation.getAllocatedOrReservedResource());

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FSAppAttempt.java

@@ -55,6 +55,7 @@
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerApplicationAttempt;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerNode;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerUtils;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.ContainerRequest;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.PendingAsk;
 import org.apache.hadoop.yarn.server.scheduler.SchedulerRequestKey;
 import org.apache.hadoop.yarn.server.utils.BuilderUtils;
@@ -460,13 +461,13 @@ public RMContainer allocate(NodeType type, FSSchedulerNode node,
       liveContainers.put(container.getId(), rmContainer);
 
       // Update consumption and track allocations
-      List<ResourceRequest> resourceRequestList = appSchedulingInfo.allocate(
+      ContainerRequest containerRequest = appSchedulingInfo.allocate(
           type, node, schedulerKey, container);
       this.attemptResourceUsage.incUsed(container.getResource());
       getQueue().incUsedResource(container.getResource());
 
       // Update resource requests related to "request" and store in RMContainer
-      ((RMContainerImpl) rmContainer).setResourceRequests(resourceRequestList);
+      ((RMContainerImpl) rmContainer).setContainerRequest(containerRequest);
 
       // Inform the container
       rmContainer.handle(

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

@@ -33,6 +33,7 @@
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ActiveUsersManager;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.NodeType;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.Queue;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.ContainerRequest;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerApp;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerNode;
 
@@ -80,14 +81,14 @@ public RMContainer allocate(NodeType type, FiCaSchedulerNode node,
       liveContainers.put(containerId, rmContainer);
 
       // Update consumption and track allocations
-      List<ResourceRequest> resourceRequestList = appSchedulingInfo.allocate(
+      ContainerRequest containerRequest = appSchedulingInfo.allocate(
           type, node, schedulerKey, container);
 
       attemptResourceUsage.incUsed(node.getPartition(),
           container.getResource());
 
       // Update resource requests related to "request" and store in RMContainer
-      ((RMContainerImpl) rmContainer).setResourceRequests(resourceRequestList);
+      ((RMContainerImpl) rmContainer).setContainerRequest(containerRequest);
 
       // Inform the container
       rmContainer.handle(

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/placement/AppPlacementAllocator.java

@@ -22,6 +22,7 @@
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.NodeType;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerNode;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.SchedulingMode;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.ContainerRequest;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.PendingAsk;
 import org.apache.hadoop.yarn.server.scheduler.SchedulerRequestKey;
 
@@ -57,14 +58,14 @@ public interface AppPlacementAllocator<N extends SchedulerNode> {
   Iterator<N> getPreferredNodeIterator(CandidateNodeSet<N> candidateNodeSet);
 
   /**
-   * Replace existing ResourceRequest by the new requests
+   * Replace existing pending asks by the new requests
    *
-   * @param requests new ResourceRequests
+   * @param requests new asks
    * @param recoverPreemptedRequestForAContainer if we're recovering resource
    * requests for preempted container
    * @return true if total pending resource changed
    */
-  ResourceRequestUpdateResult updateResourceRequests(
+  PendingAskUpdateResult updatePendingAsk(
       Collection<ResourceRequest> requests,
       boolean recoverPreemptedRequestForAContainer);
 
@@ -97,17 +98,13 @@ ResourceRequestUpdateResult updateResourceRequests(
    * @param schedulerKey SchedulerRequestKey for this ResourceRequest
    * @param type Type of the allocation
    * @param node Which node this container allocated on
-   * @return list of ResourceRequests deducted
+   * @return ContainerRequest which include resource requests associated with
+   *         the container. This will be used by scheduler to recover requests.
+   *         Please refer to {@link ContainerRequest} for more details.
    */
-  List<ResourceRequest> allocate(SchedulerRequestKey schedulerKey,
+  ContainerRequest allocate(SchedulerRequestKey schedulerKey,
       NodeType type, SchedulerNode node);
 
-  /**
-   * Returns list of accepted resourceNames.
-   * @return Iterator of accepted resourceNames
-   */
-  Iterator<String> getAcceptedResouceNames();
-
   /**
    * We can still have pending requirement for a given NodeType and node
    * @param type Locality Type

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/placement/LocalityAppPlacementAllocator.java

@@ -28,6 +28,7 @@
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerNode;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.SchedulingMode;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.ContainerRequest;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.PendingAsk;
 import org.apache.hadoop.yarn.server.scheduler.SchedulerRequestKey;
 
@@ -44,7 +45,7 @@
  * into account locality preferences (node, rack, any) when allocating
  * containers.
  */
-public class LocalityAppPlacementAllocator<N extends SchedulerNode>
+public class LocalityAppPlacementAllocator <N extends SchedulerNode>
     implements AppPlacementAllocator<N> {
   private static final Log LOG =
       LogFactory.getLog(LocalityAppPlacementAllocator.class);
@@ -122,13 +123,13 @@ private void updateNodeLabels(ResourceRequest request) {
   }
 
   @Override
-  public ResourceRequestUpdateResult updateResourceRequests(
+  public PendingAskUpdateResult updatePendingAsk(
       Collection<ResourceRequest> requests,
       boolean recoverPreemptedRequestForAContainer) {
     try {
       this.writeLock.lock();
 
-      ResourceRequestUpdateResult updateResult = null;
+      PendingAskUpdateResult updateResult = null;
 
       // Update resource requests
       for (ResourceRequest request : requests) {
@@ -156,7 +157,16 @@ public ResourceRequestUpdateResult updateResourceRequests(
           //update the applications requested labels set
           appSchedulingInfo.addRequestedPartition(partition);
 
-          updateResult = new ResourceRequestUpdateResult(lastRequest, request);
+          PendingAsk lastPendingAsk =
+              lastRequest == null ? null : new PendingAsk(
+                  lastRequest.getCapability(), lastRequest.getNumContainers());
+          String lastRequestedNodePartition =
+              lastRequest == null ? null : lastRequest.getNodeLabelExpression();
+
+          updateResult = new PendingAskUpdateResult(lastPendingAsk,
+              new PendingAsk(request.getCapability(),
+                  request.getNumContainers()), lastRequestedNodePartition,
+              request.getNodeLabelExpression());
         }
       }
       return updateResult;
@@ -380,7 +390,7 @@ public void showRequests() {
   }
 
   @Override
-  public List<ResourceRequest> allocate(SchedulerRequestKey schedulerKey,
+  public ContainerRequest allocate(SchedulerRequestKey schedulerKey,
       NodeType type, SchedulerNode node) {
     try {
       writeLock.lock();
@@ -404,19 +414,9 @@ public List<ResourceRequest> allocate(SchedulerRequestKey schedulerKey,
         allocateOffSwitch(schedulerKey, request, resourceRequests);
       }
 
-      return resourceRequests;
+      return new ContainerRequest(resourceRequests);
     } finally {
       writeLock.unlock();
     }
   }
-
-  @Override
-  public Iterator<String> getAcceptedResouceNames() {
-    try {
-      readLock.lock();
-      return resourceRequestMap.keySet().iterator();
-    } finally {
-      readLock.unlock();
-    }
-  }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/placement/PendingAskUpdateResult.java

@@ -0,0 +1,65 @@
+/**
+ * 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.placement;
+
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.PendingAsk;
+
+/**
+ * Result of a resource-request update. This will be used by
+ * {@link org.apache.hadoop.yarn.server.resourcemanager.scheduler.AppSchedulingInfo}
+ * to update queue metrics and application/queue's overall pending resources.
+ * And this is per-scheduler-key.
+ *
+ * Following fields will be set if pending ask changed for a given scheduler key
+ * - lastPendingAsk: how many resource asked before.
+ * - newPendingAsk: how many resource asked now.
+ * - lastNodePartition: what's the node partition before.
+ * - newNodePartition: what's the node partition now.
+ */
+public class PendingAskUpdateResult {
+  private final PendingAsk lastPendingAsk;
+  private final String lastNodePartition;
+  private final PendingAsk newPendingAsk;
+  private final String newNodePartition;
+
+  public PendingAskUpdateResult(PendingAsk lastPendingAsk,
+      PendingAsk newPendingAsk, String lastNodePartition,
+      String newNodePartition) {
+    this.lastPendingAsk = lastPendingAsk;
+    this.newPendingAsk = newPendingAsk;
+    this.lastNodePartition = lastNodePartition;
+    this.newNodePartition = newNodePartition;
+  }
+
+  public PendingAsk getLastPendingAsk() {
+    return lastPendingAsk;
+  }
+
+  public PendingAsk getNewPendingAsk() {
+    return newPendingAsk;
+  }
+
+  public String getLastNodePartition() {
+    return lastNodePartition;
+  }
+
+  public String getNewNodePartition() {
+    return newNodePartition;
+  }
+}

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/placement/ResourceRequestUpdateResult.java

@@ -1,43 +0,0 @@
-/**
- * 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.placement;
-
-import org.apache.hadoop.yarn.api.records.ResourceRequest;
-
-/**
- * Result of ResourceRequest update
- */
-public class ResourceRequestUpdateResult {
-  private final ResourceRequest lastAnyResourceRequest;
-  private final ResourceRequest newResourceRequest;
-
-  public ResourceRequestUpdateResult(ResourceRequest lastAnyResourceRequest,
-      ResourceRequest newResourceRequest) {
-    this.lastAnyResourceRequest = lastAnyResourceRequest;
-    this.newResourceRequest = newResourceRequest;
-  }
-
-  public ResourceRequest getLastAnyResourceRequest() {
-    return lastAnyResourceRequest;
-  }
-
-  public ResourceRequest getNewResourceRequest() {
-    return newResourceRequest;
-  }
-}

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

@@ -431,7 +431,7 @@ private void updateResourceRequests(Map<String, ResourceRequest> requests,
     if (type == NodeType.NODE_LOCAL) {
       for (String host : task.getHosts()) {
         if(LOG.isDebugEnabled()) {
-          LOG.debug("updateResourceRequests:" + " application=" + applicationId
+          LOG.debug("updatePendingAsk:" + " application=" + applicationId
             + " type=" + type + " host=" + host
             + " request=" + ((requests == null) ? "null" : requests.get(host)));
         }
@@ -442,7 +442,7 @@ private void updateResourceRequests(Map<String, ResourceRequest> requests,
     if (type == NodeType.NODE_LOCAL || type == NodeType.RACK_LOCAL) {
       for (String rack : task.getRacks()) {
         if(LOG.isDebugEnabled()) {
-          LOG.debug("updateResourceRequests:" + " application=" + applicationId
+          LOG.debug("updatePendingAsk:" + " application=" + applicationId
             + " type=" + type + " rack=" + rack
             + " request=" + ((requests == null) ? "null" : requests.get(rack)));
         }
@@ -453,7 +453,7 @@ private void updateResourceRequests(Map<String, ResourceRequest> requests,
     updateResourceRequest(requests.get(ResourceRequest.ANY));
     
     if(LOG.isDebugEnabled()) {
-      LOG.debug("updateResourceRequests:" + " application=" + applicationId
+      LOG.debug("updatePendingAsk:" + " application=" + applicationId
         + " #asks=" + ask.size());
     }
   }

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

@@ -278,8 +278,8 @@ public void testExistenceOfResourceRequestInRMContainer() throws Exception {
 
     // Verify whether list of ResourceRequest is present in RMContainer
     // while moving to ALLOCATED state
-    Assert.assertNotNull(scheduler.getRMContainer(containerId2)
-        .getResourceRequests());
+    Assert.assertNotNull(
+        scheduler.getRMContainer(containerId2).getContainerRequest());
 
     // Allocate container
     am1.allocate(new ArrayList<ResourceRequest>(), new ArrayList<ContainerId>())
@@ -288,8 +288,8 @@ public void testExistenceOfResourceRequestInRMContainer() throws Exception {
 
     // After RMContainer moving to ACQUIRED state, list of ResourceRequest will
     // be empty
-    Assert.assertNull(scheduler.getRMContainer(containerId2)
-        .getResourceRequests());
+    Assert.assertNull(
+        scheduler.getRMContainer(containerId2).getContainerRequest());
   }
 
   @Test (timeout = 180000)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/TestCapacityScheduler.java

@@ -1696,7 +1696,8 @@ public void testRecoverRequestAfterPreemption() throws Exception {
     rm1.waitForState(nm1, containerId1, RMContainerState.ALLOCATED);
 
     RMContainer rmContainer = cs.getRMContainer(containerId1);
-    List<ResourceRequest> requests = rmContainer.getResourceRequests();
+    List<ResourceRequest> requests =
+        rmContainer.getContainerRequest().getResourceRequests();
     FiCaSchedulerApp app = cs.getApplicationAttempt(am1
         .getApplicationAttemptId());