YARN-4090. Make Collections.sort() more efficient by caching resource usage. (Contributed by Yufei Gu, Shilong Zhang and Xianyin Xin)

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

@@ -48,6 +48,7 @@
 import org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainerEventType;
 import org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainerFinishedEvent;
 import org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainerImpl;
+import org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainerState;
 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.QueueMetrics;
@@ -167,6 +168,7 @@ void containerCompleted(RMContainer rmContainer,
           rmContainer.getNodeLabelExpression(),
           getUser(), 1, containerResource);
       this.attemptResourceUsage.decUsed(containerResource);
+      getQueue().decUsedResource(containerResource);
 
       // Clear resource utilization metrics cache.
       lastMemoryAggregateAllocationUpdateTime = -1;
@@ -461,6 +463,7 @@ public RMContainer allocate(NodeType type, FSSchedulerNode node,
       List<ResourceRequest> resourceRequestList = 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);
@@ -644,6 +647,22 @@ private Container createContainer(FSSchedulerNode node, Resource capability,
         schedulerKey.getAllocationRequestId());
   }
 
+  @Override
+  public synchronized void recoverContainer(SchedulerNode node,
+      RMContainer rmContainer) {
+    try {
+      writeLock.lock();
+
+      super.recoverContainer(node, rmContainer);
+
+      if (!rmContainer.getState().equals(RMContainerState.COMPLETED)) {
+        getQueue().incUsedResource(rmContainer.getContainer().getResource());
+      }
+    } finally {
+      writeLock.unlock();
+    }
+  }
+
   /**
    * Reserve a spot for {@code container} on this {@code node}. If
    * the container is {@code alreadyReserved} on the node, simply

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

@@ -89,6 +89,7 @@ void addApp(FSAppAttempt app, boolean runnable) {
       } else {
         nonRunnableApps.add(app);
       }
+      incUsedResource(app.getResourceUsage());
     } finally {
       writeLock.unlock();
     }
@@ -123,6 +124,7 @@ boolean removeApp(FSAppAttempt app) {
       getMetrics().setAMResourceUsage(amResourceUsage);
     }
 
+    decUsedResource(app.getResourceUsage());
     return runnable;
   }
 
@@ -292,23 +294,6 @@ public Resource getDemand() {
     return demand;
   }
 
-  @Override
-  public Resource getResourceUsage() {
-    Resource usage = Resources.createResource(0);
-    readLock.lock();
-    try {
-      for (FSAppAttempt app : runnableApps) {
-        Resources.addTo(usage, app.getResourceUsage());
-      }
-      for (FSAppAttempt app : nonRunnableApps) {
-        Resources.addTo(usage, app.getResourceUsage());
-      }
-    } finally {
-      readLock.unlock();
-    }
-    return usage;
-  }
-
   Resource getAmResourceUsage() {
     return amResourceUsage;
   }

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

@@ -118,20 +118,6 @@ public Resource getDemand() {
     }
   }
 
-  @Override
-  public Resource getResourceUsage() {
-    Resource usage = Resources.createResource(0);
-    readLock.lock();
-    try {
-      for (FSQueue child : childQueues) {
-        Resources.addTo(usage, child.getResourceUsage());
-      }
-    } finally {
-      readLock.unlock();
-    }
-    return usage;
-  }
-
   @Override
   public void updateDemand() {
     // Compute demand by iterating through apps in the queue

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

@@ -57,6 +57,7 @@ public abstract class FSQueue implements Queue, Schedulable {
   private Resource fairShare = Resources.createResource(0, 0);
   private Resource steadyFairShare = Resources.createResource(0, 0);
   private Resource reservedResource = Resources.createResource(0, 0);
+  private final Resource resourceUsage = Resource.newInstance(0, 0);
   private final String name;
   protected final FairScheduler scheduler;
   private final YarnAuthorizationProvider authorizer;
@@ -478,6 +479,39 @@ public void incReservedResource(String nodeLabel, Resource resourceToInc) {
   public void decReservedResource(String nodeLabel, Resource resourceToDec) {
   }
 
+  @Override
+  public Resource getResourceUsage() {
+    return resourceUsage;
+  }
+
+  /**
+   * Increase resource usage for this queue and all parent queues.
+   *
+   * @param res the resource to increase
+   */
+  protected void incUsedResource(Resource res) {
+    synchronized (resourceUsage) {
+      Resources.addTo(resourceUsage, res);
+      if (parent != null) {
+        parent.incUsedResource(res);
+      }
+    }
+  }
+
+  /**
+   * Decrease resource usage for this queue and all parent queues.
+   *
+   * @param res the resource to decrease
+   */
+  protected void decUsedResource(Resource res) {
+    synchronized (resourceUsage) {
+      Resources.subtractFrom(resourceUsage, res);
+      if (parent != null) {
+        parent.decUsedResource(res);
+      }
+    }
+  }
+
   @Override
   public Priority getDefaultApplicationPriority() {
     // TODO add implementation for FSParentQueue

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

@@ -4586,6 +4586,43 @@ public void testAddAndRemoveAppFromFairScheduler() throws Exception {
       scheduler.getSchedulerApplications(), scheduler, "default");
   }
 
+  @Test
+  public void testResourceUsageByMoveApp() throws Exception {
+    scheduler.init(conf);
+    scheduler.start();
+    scheduler.reinitialize(conf, resourceManager.getRMContext());
+
+    RMNode node1 = MockNodes.newNodeInfo(
+        1, Resources.createResource(1 * GB, 4), 1, "127.0.0.1");
+    NodeAddedSchedulerEvent nodeEvent1 = new NodeAddedSchedulerEvent(node1);
+    scheduler.handle(nodeEvent1);
+
+    ApplicationAttemptId appAttId =
+        createSchedulingRequest(1 * GB, 2, "parent1.queue1", "user1", 2);
+    scheduler.update();
+
+    NodeUpdateSchedulerEvent updateEvent = new NodeUpdateSchedulerEvent(node1);
+    scheduler.handle(updateEvent);
+
+    QueueManager queueMgr = scheduler.getQueueManager();
+    FSQueue parent1 = queueMgr.getParentQueue("parent1", true);
+    FSQueue parent2 = queueMgr.getParentQueue("parent2", true);
+    FSQueue queue2 = queueMgr.getLeafQueue("parent2.queue2", true);
+    FSQueue queue1 = queueMgr.getLeafQueue("parent1.queue1", true);
+
+    Assert.assertEquals(parent2.getResourceUsage().getMemorySize(), 0);
+    Assert.assertEquals(queue2.getResourceUsage().getMemorySize(), 0);
+    Assert.assertEquals(parent1.getResourceUsage().getMemorySize(), 1 * GB);
+    Assert.assertEquals(queue1.getResourceUsage().getMemorySize(), 1 * GB);
+
+    scheduler.moveApplication(appAttId.getApplicationId(), "parent2.queue2");
+
+    Assert.assertEquals(parent2.getResourceUsage().getMemorySize(), 1 * GB);
+    Assert.assertEquals(queue2.getResourceUsage().getMemorySize(), 1 * GB);
+    Assert.assertEquals(parent1.getResourceUsage().getMemorySize(), 0);
+    Assert.assertEquals(queue1.getResourceUsage().getMemorySize(), 0);
+  }
+    
   @Test (expected = YarnException.class)
   public void testMoveWouldViolateMaxAppsConstraints() throws Exception {
     scheduler.init(conf);