YARN-2393. FairScheduler: Add the notion of steady fair share. (Wei Yan via kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1619845 13f79535-47bb-0310-9956-ffa450edef68

hadoop-yarn-project/CHANGES.txt

@@ -55,6 +55,9 @@ Release 2.6.0 - UNRELEASED
     YARN-2174. Enable HTTPs for the writer REST API of TimelineServer.
     (Zhijie Shen via jianhe)
 
+    YARN-2393. FairScheduler: Add the notion of steady fair share. 
+    (Wei Yan via kasha)
+
   IMPROVEMENTS
 
     YARN-2197. Add a link to YARN CHANGES.txt in the left side of doc

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

@@ -717,12 +717,6 @@ public void setFairShare(Resource fairShare) {
     this.fairShare = fairShare;
   }
 
-  @Override
-  public boolean isActive() {
-    return true;
-  }
-
-
   @Override
   public void updateDemand() {
     demand = Resources.createResource(0);

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

@@ -35,7 +35,6 @@
 import org.apache.hadoop.yarn.api.records.Resource;
 import org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainer;
 import org.apache.hadoop.yarn.util.resource.Resources;
-import org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainer;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ActiveUsersManager;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerApplicationAttempt;
 
@@ -68,6 +67,16 @@ public void recomputeShares() {
     }
   }
 
+  public void recomputeSteadyShares() {
+    policy.computeSteadyShares(childQueues, getSteadyFairShare());
+    for (FSQueue childQueue : childQueues) {
+      childQueue.getMetrics().setSteadyFairShare(childQueue.getSteadyFairShare());
+      if (childQueue instanceof FSParentQueue) {
+        ((FSParentQueue) childQueue).recomputeSteadyShares();
+      }
+    }
+  }
+
   @Override
   public Resource getDemand() {
     return demand;

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

@@ -41,6 +41,7 @@
 @Unstable
 public abstract class FSQueue implements Queue, Schedulable {
   private Resource fairShare = Resources.createResource(0, 0);
+  private Resource steadyFairShare = Resources.createResource(0, 0);
   private final String name;
   protected final FairScheduler scheduler;
   private final FSQueueMetrics metrics;
@@ -152,6 +153,16 @@ public void setFairShare(Resource fairShare) {
     metrics.setFairShare(fairShare);
   }
 
+  /** Get the steady fair share assigned to this Schedulable. */
+  public Resource getSteadyFairShare() {
+    return steadyFairShare;
+  }
+
+  public void setSteadyFairShare(Resource steadyFairShare) {
+    this.steadyFairShare = steadyFairShare;
+    metrics.setSteadyFairShare(steadyFairShare);
+  }
+
   public boolean hasAccess(QueueACL acl, UserGroupInformation user) {
     return scheduler.getAllocationConfiguration().hasAccess(name, acl, user);
   }
@@ -194,7 +205,9 @@ protected boolean assignContainerPreCheck(FSSchedulerNode node) {
     return true;
   }
 
-  @Override
+  /**
+   * Returns true if queue has at least one app running.
+   */
   public boolean isActive() {
     return getNumRunnableApps() > 0;
   }

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

@@ -33,6 +33,8 @@ public class FSQueueMetrics extends QueueMetrics {
 
   @Metric("Fair share of memory in MB") MutableGaugeInt fairShareMB;
   @Metric("Fair share of CPU in vcores") MutableGaugeInt fairShareVCores;
+  @Metric("Steady fair share of memory in MB") MutableGaugeInt steadyFairShareMB;
+  @Metric("Steady fair share of CPU in vcores") MutableGaugeInt steadyFairShareVCores;
   @Metric("Minimum share of memory in MB") MutableGaugeInt minShareMB;
   @Metric("Minimum share of CPU in vcores") MutableGaugeInt minShareVCores;
   @Metric("Maximum share of memory in MB") MutableGaugeInt maxShareMB;
@@ -56,6 +58,19 @@ public int getFairShareVirtualCores() {
     return fairShareVCores.value();
   }
 
+  public void setSteadyFairShare(Resource resource) {
+    steadyFairShareMB.set(resource.getMemory());
+    steadyFairShareVCores.set(resource.getVirtualCores());
+  }
+
+  public int getSteadyFairShareMB() {
+    return steadyFairShareMB.value();
+  }
+
+  public int getSteadyFairShareVCores() {
+    return steadyFairShareVCores.value();
+  }
+
   public void setMinShare(Resource resource) {
     minShareMB.set(resource.getMemory());
     minShareVCores.set(resource.getVirtualCores());

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

@@ -851,6 +851,8 @@ private synchronized void addNode(RMNode node) {
     Resources.addTo(clusterResource, node.getTotalCapability());
     updateRootQueueMetrics();
 
+    queueMgr.getRootQueue().setSteadyFairShare(clusterResource);
+    queueMgr.getRootQueue().recomputeSteadyShares();
     LOG.info("Added node " + node.getNodeAddress() +
         " cluster capacity: " + clusterResource);
   }
@@ -885,6 +887,8 @@ private synchronized void removeNode(RMNode rmNode) {
     }
 
     nodes.remove(rmNode.getNodeID());
+    queueMgr.getRootQueue().setSteadyFairShare(clusterResource);
+    queueMgr.getRootQueue().recomputeSteadyShares();
     LOG.info("Removed node " + rmNode.getNodeAddress() +
         " cluster capacity: " + clusterResource);
   }

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

@@ -118,6 +118,11 @@ private FSQueue getQueue(String name, boolean create, FSQueueType queueType) {
       if (queue == null && create) {
         // if the queue doesn't exist,create it and return
         queue = createQueue(name, queueType);
+
+        // Update steady fair share for all queues
+        if (queue != null) {
+          rootQueue.recomputeSteadyShares();
+        }
       }
       return queue;
     }
@@ -376,5 +381,8 @@ public void updateAllocationConfiguration(AllocationConfiguration queueConf) {
             + queue.getName(), ex);
       }
     }
+
+    // Update steady fair shares for all queues
+    rootQueue.recomputeSteadyShares();
   }
 }

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

@@ -24,7 +24,6 @@
 import org.apache.hadoop.yarn.api.records.Resource;
 import org.apache.hadoop.yarn.server.resourcemanager.resource.ResourceWeights;
 import org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainer;
-import org.apache.hadoop.yarn.util.resource.Resources;
 
 /**
  * A Schedulable represents an entity that can be scheduled such as an
@@ -102,10 +101,4 @@ public interface Schedulable {
 
   /** Assign a fair share to this Schedulable. */
   public void setFairShare(Resource fairShare);
-
-  /**
-   * Returns true if queue has atleast one app running. Always returns true for
-   * AppSchedulables.
-   */
-  public boolean isActive();
 }

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

@@ -17,10 +17,6 @@
  */
 package org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair;
 
-import java.util.Collection;
-import java.util.Comparator;
-import java.util.concurrent.ConcurrentHashMap;
-
 import org.apache.hadoop.classification.InterfaceAudience.Public;
 import org.apache.hadoop.classification.InterfaceStability.Evolving;
 import org.apache.hadoop.util.ReflectionUtils;
@@ -29,6 +25,10 @@
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.policies.FairSharePolicy;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.policies.FifoPolicy;
 
+import java.util.Collection;
+import java.util.Comparator;
+import java.util.concurrent.ConcurrentHashMap;
+
 @Public
 @Evolving
 public abstract class SchedulingPolicy {
@@ -131,8 +131,10 @@ public static boolean isApplicableTo(SchedulingPolicy policy, byte depth) {
   public abstract Comparator<Schedulable> getComparator();
 
   /**
-   * Computes and updates the shares of {@link Schedulable}s as per the
+   * Computes and updates the shares of {@link Schedulable}s as per
-   * {@link SchedulingPolicy}, to be used later at schedule time.
+   * the {@link SchedulingPolicy}, to be used later for scheduling decisions.
+   * The shares computed are instantaneous and only consider queues with
+   * running applications.
    * 
    * @param schedulables {@link Schedulable}s whose shares are to be updated
    * @param totalResources Total {@link Resource}s in the cluster
@@ -140,6 +142,19 @@ public static boolean isApplicableTo(SchedulingPolicy policy, byte depth) {
   public abstract void computeShares(
       Collection<? extends Schedulable> schedulables, Resource totalResources);
 
+  /**
+   * Computes and updates the steady shares of {@link FSQueue}s as per the
+   * {@link SchedulingPolicy}. The steady share does not differentiate
+   * between queues with and without running applications under them. The
+   * steady share is not used for scheduling, it is displayed on the Web UI
+   * for better visibility.
+   *
+   * @param queues {@link FSQueue}s whose shares are to be updated
+   * @param totalResources Total {@link Resource}s in the cluster
+   */
+  public abstract void computeSteadyShares(
+      Collection<? extends FSQueue> queues, Resource totalResources);
+
   /**
    * Check if the resource usage is over the fair share under this policy
    *

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

@@ -22,6 +22,7 @@
 
 import org.apache.hadoop.yarn.api.records.Resource;
 import org.apache.hadoop.yarn.server.resourcemanager.resource.ResourceType;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSQueue;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.Schedulable;
 
 /**
@@ -49,14 +50,29 @@ public static void computeShares(
       ResourceType type) {
     Collection<Schedulable> activeSchedulables = new ArrayList<Schedulable>();
     for (Schedulable sched : schedulables) {
-      if (sched.isActive()) {
+      if ((sched instanceof FSQueue) && !((FSQueue) sched).isActive()) {
-        activeSchedulables.add(sched);
-      } else {
         setResourceValue(0, sched.getFairShare(), type);
+      } else {
+        activeSchedulables.add(sched);
       }
     }
 
-    computeSharesInternal(activeSchedulables, totalResources, type);
+    computeSharesInternal(activeSchedulables, totalResources, type, false);
+  }
+
+  /**
+   * Compute the steady fair share of the given queues. The steady fair
+   * share is an allocation of shares considering all queues, i.e.,
+   * active and inactive.
+   *
+   * @param queues
+   * @param totalResources
+   * @param type
+   */
+  public static void computeSteadyShares(
+      Collection<? extends FSQueue> queues, Resource totalResources,
+      ResourceType type) {
+    computeSharesInternal(queues, totalResources, type, true);
   }
 
   /**
@@ -102,7 +118,7 @@ public static void computeShares(
    */
   private static void computeSharesInternal(
       Collection<? extends Schedulable> schedulables, Resource totalResources,
-      ResourceType type) {
+      ResourceType type, boolean isSteadyShare) {
     if (schedulables.isEmpty()) {
       return;
     }
@@ -145,7 +161,13 @@ private static void computeSharesInternal(
     }
     // Set the fair shares based on the value of R we've converged to
     for (Schedulable sched : schedulables) {
-      setResourceValue(computeShare(sched, right, type), sched.getFairShare(), type);
+      if (isSteadyShare) {
+        setResourceValue(computeShare(sched, right, type),
+            ((FSQueue) sched).getSteadyFairShare(), type);
+      } else {
+        setResourceValue(
+            computeShare(sched, right, type), sched.getFairShare(), type);
+      }
     }
   }
 

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

@@ -26,6 +26,7 @@
 import org.apache.hadoop.yarn.api.records.Resource;
 import org.apache.hadoop.yarn.server.resourcemanager.resource.ResourceType;
 import org.apache.hadoop.yarn.server.resourcemanager.resource.ResourceWeights;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSQueue;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.Schedulable;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.SchedulingPolicy;
 import org.apache.hadoop.yarn.util.resource.Resources;
@@ -69,6 +70,14 @@ public void computeShares(Collection<? extends Schedulable> schedulables,
     }
   }
 
+  @Override
+  public void computeSteadyShares(Collection<? extends FSQueue> queues,
+      Resource totalResources) {
+    for (ResourceType type : ResourceType.values()) {
+      ComputeFairShares.computeSteadyShares(queues, totalResources, type);
+    }
+  }
+  
   @Override
   public boolean checkIfUsageOverFairShare(Resource usage, Resource fairShare) {
     return !Resources.fitsIn(usage, fairShare);

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

@@ -25,6 +25,7 @@
 import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.yarn.api.records.Resource;
 import org.apache.hadoop.yarn.server.resourcemanager.resource.ResourceType;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSQueue;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.Schedulable;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.SchedulingPolicy;
 import org.apache.hadoop.yarn.util.resource.DefaultResourceCalculator;
@@ -119,6 +120,13 @@ public void computeShares(Collection<? extends Schedulable> schedulables,
     ComputeFairShares.computeShares(schedulables, totalResources, ResourceType.MEMORY);
   }
 
+  @Override
+  public void computeSteadyShares(Collection<? extends FSQueue> queues,
+      Resource totalResources) {
+    ComputeFairShares.computeSteadyShares(queues, totalResources,
+        ResourceType.MEMORY);
+  }
+
   @Override
   public boolean checkIfUsageOverFairShare(Resource usage, Resource fairShare) {
     return Resources.greaterThan(RESOURCE_CALCULATOR, null, usage, fairShare);

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

@@ -24,6 +24,7 @@
 import org.apache.hadoop.classification.InterfaceAudience.Private;
 import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.yarn.api.records.Resource;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSQueue;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.Schedulable;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.SchedulingPolicy;
 import org.apache.hadoop.yarn.util.resource.Resources;
@@ -87,6 +88,13 @@ public void computeShares(Collection<? extends Schedulable> schedulables,
     earliest.setFairShare(Resources.clone(totalResources));
   }
 
+  @Override
+  public void computeSteadyShares(Collection<? extends FSQueue> queues,
+      Resource totalResources) {
+    // Nothing needs to do, as leaf queue doesn't have to calculate steady
+    // fair shares for applications.
+  }
+
   @Override
   public boolean checkIfUsageOverFairShare(Resource usage, Resource fairShare) {
     throw new UnsupportedOperationException(

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

@@ -100,11 +100,6 @@ public void setFairShare(Resource fairShare) {
     this.fairShare = fairShare;
   }
 
-  @Override
-  public boolean isActive() {
-    return true;
-  }
-
   @Override
   public Resource getDemand() {
     return null;

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

@@ -292,14 +292,19 @@ public void testSimpleFairShareCalculation() throws IOException {
     createSchedulingRequest(10 * 1024, "root.default", "user1");
 
     scheduler.update();
+    scheduler.getQueueManager().getRootQueue()
+        .setSteadyFairShare(scheduler.getClusterResource());
+    scheduler.getQueueManager().getRootQueue().recomputeSteadyShares();
 
     Collection<FSLeafQueue> queues = scheduler.getQueueManager().getLeafQueues();
     assertEquals(3, queues.size());
     
-    // Divided three ways - betwen the two queues and the default queue
+    // Divided three ways - between the two queues and the default queue
     for (FSLeafQueue p : queues) {
       assertEquals(3414, p.getFairShare().getMemory());
       assertEquals(3414, p.getMetrics().getFairShareMB());
+      assertEquals(3414, p.getSteadyFairShare().getMemory());
+      assertEquals(3414, p.getMetrics().getSteadyFairShareMB());
     }
   }
   
@@ -323,6 +328,9 @@ public void testSimpleHierarchicalFairShareCalculation() throws IOException {
     createSchedulingRequest(10 * 1024, "root.default", "user1");
 
     scheduler.update();
+    scheduler.getQueueManager().getRootQueue()
+        .setSteadyFairShare(scheduler.getClusterResource());
+    scheduler.getQueueManager().getRootQueue().recomputeSteadyShares();
 
     QueueManager queueManager = scheduler.getQueueManager();
     Collection<FSLeafQueue> queues = queueManager.getLeafQueues();
@@ -333,10 +341,16 @@ public void testSimpleHierarchicalFairShareCalculation() throws IOException {
     FSLeafQueue queue3 = queueManager.getLeafQueue("parent.queue3", true);
     assertEquals(capacity / 2, queue1.getFairShare().getMemory());
     assertEquals(capacity / 2, queue1.getMetrics().getFairShareMB());
+    assertEquals(capacity / 2, queue1.getSteadyFairShare().getMemory());
+    assertEquals(capacity / 2, queue1.getMetrics().getSteadyFairShareMB());
     assertEquals(capacity / 4, queue2.getFairShare().getMemory());
     assertEquals(capacity / 4, queue2.getMetrics().getFairShareMB());
+    assertEquals(capacity / 4, queue2.getSteadyFairShare().getMemory());
+    assertEquals(capacity / 4, queue2.getMetrics().getSteadyFairShareMB());
     assertEquals(capacity / 4, queue3.getFairShare().getMemory());
     assertEquals(capacity / 4, queue3.getMetrics().getFairShareMB());
+    assertEquals(capacity / 4, queue3.getSteadyFairShare().getMemory());
+    assertEquals(capacity / 4, queue3.getMetrics().getSteadyFairShareMB());
   }
 
   @Test
@@ -771,6 +785,9 @@ public void testFairShareAndWeightsInNestedUserQueueRule() throws Exception {
     createSchedulingRequest(10 * 1024, "root.default", "user3");
 
     scheduler.update();
+    scheduler.getQueueManager().getRootQueue()
+        .setSteadyFairShare(scheduler.getClusterResource());
+    scheduler.getQueueManager().getRootQueue().recomputeSteadyShares();
 
     Collection<FSLeafQueue> leafQueues = scheduler.getQueueManager()
         .getLeafQueues();
@@ -780,12 +797,128 @@ public void testFairShareAndWeightsInNestedUserQueueRule() throws Exception {
           || leaf.getName().equals("root.parentq.user2")) {
         // assert that the fair share is 1/4th node1's capacity
         assertEquals(capacity / 4, leaf.getFairShare().getMemory());
+        // assert that the steady fair share is 1/4th node1's capacity
+        assertEquals(capacity / 4, leaf.getSteadyFairShare().getMemory());
         // assert weights are equal for both the user queues
         assertEquals(1.0, leaf.getWeights().getWeight(ResourceType.MEMORY), 0);
       }
     }
   }
 
+  @Test
+  public void testSteadyFairShareWithReloadAndNodeAddRemove() throws Exception {
+    conf.set(FairSchedulerConfiguration.ALLOCATION_FILE, ALLOC_FILE);
+
+    PrintWriter out = new PrintWriter(new FileWriter(ALLOC_FILE));
+    out.println("<?xml version=\"1.0\"?>");
+    out.println("<allocations>");
+    out.println("<defaultQueueSchedulingPolicy>fair</defaultQueueSchedulingPolicy>");
+    out.println("<queue name=\"root\">");
+    out.println("  <schedulingPolicy>drf</schedulingPolicy>");
+    out.println("  <queue name=\"child1\">");
+    out.println("    <weight>1</weight>");
+    out.println("  </queue>");
+    out.println("  <queue name=\"child2\">");
+    out.println("    <weight>1</weight>");
+    out.println("  </queue>");
+    out.println("</queue>");
+    out.println("</allocations>");
+    out.close();
+
+    scheduler.init(conf);
+    scheduler.start();
+    scheduler.reinitialize(conf, resourceManager.getRMContext());
+
+    // The steady fair share for all queues should be 0
+    QueueManager queueManager = scheduler.getQueueManager();
+    assertEquals(0, queueManager.getLeafQueue("child1", false)
+        .getSteadyFairShare().getMemory());
+    assertEquals(0, queueManager.getLeafQueue("child2", false)
+        .getSteadyFairShare().getMemory());
+
+    // Add one node
+    RMNode node1 =
+        MockNodes
+            .newNodeInfo(1, Resources.createResource(6144), 1, "127.0.0.1");
+    NodeAddedSchedulerEvent nodeEvent1 = new NodeAddedSchedulerEvent(node1);
+    scheduler.handle(nodeEvent1);
+    assertEquals(6144, scheduler.getClusterResource().getMemory());
+
+    // The steady fair shares for all queues should be updated
+    assertEquals(2048, queueManager.getLeafQueue("child1", false)
+        .getSteadyFairShare().getMemory());
+    assertEquals(2048, queueManager.getLeafQueue("child2", false)
+        .getSteadyFairShare().getMemory());
+
+    // Reload the allocation configuration file
+    out = new PrintWriter(new FileWriter(ALLOC_FILE));
+    out.println("<?xml version=\"1.0\"?>");
+    out.println("<allocations>");
+    out.println("<defaultQueueSchedulingPolicy>fair</defaultQueueSchedulingPolicy>");
+    out.println("<queue name=\"root\">");
+    out.println("  <schedulingPolicy>drf</schedulingPolicy>");
+    out.println("  <queue name=\"child1\">");
+    out.println("    <weight>1</weight>");
+    out.println("  </queue>");
+    out.println("  <queue name=\"child2\">");
+    out.println("    <weight>2</weight>");
+    out.println("  </queue>");
+    out.println("  <queue name=\"child3\">");
+    out.println("    <weight>2</weight>");
+    out.println("  </queue>");
+    out.println("</queue>");
+    out.println("</allocations>");
+    out.close();
+    scheduler.reinitialize(conf, resourceManager.getRMContext());
+
+    // The steady fair shares for all queues should be updated
+    assertEquals(1024, queueManager.getLeafQueue("child1", false)
+        .getSteadyFairShare().getMemory());
+    assertEquals(2048, queueManager.getLeafQueue("child2", false)
+        .getSteadyFairShare().getMemory());
+    assertEquals(2048, queueManager.getLeafQueue("child3", false)
+        .getSteadyFairShare().getMemory());
+
+    // Remove the node, steady fair shares should back to 0
+    NodeRemovedSchedulerEvent nodeEvent2 = new NodeRemovedSchedulerEvent(node1);
+    scheduler.handle(nodeEvent2);
+    assertEquals(0, scheduler.getClusterResource().getMemory());
+    assertEquals(0, queueManager.getLeafQueue("child1", false)
+        .getSteadyFairShare().getMemory());
+    assertEquals(0, queueManager.getLeafQueue("child2", false)
+        .getSteadyFairShare().getMemory());
+  }
+
+  @Test
+  public void testSteadyFairShareWithQueueCreatedRuntime() throws Exception {
+    conf.setClass(CommonConfigurationKeys.HADOOP_SECURITY_GROUP_MAPPING,
+        SimpleGroupsMapping.class, GroupMappingServiceProvider.class);
+    conf.set(FairSchedulerConfiguration.USER_AS_DEFAULT_QUEUE, "true");
+    scheduler.init(conf);
+    scheduler.start();
+    scheduler.reinitialize(conf, resourceManager.getRMContext());
+
+    // Add one node
+    RMNode node1 =
+        MockNodes
+            .newNodeInfo(1, Resources.createResource(6144), 1, "127.0.0.1");
+    NodeAddedSchedulerEvent nodeEvent1 = new NodeAddedSchedulerEvent(node1);
+    scheduler.handle(nodeEvent1);
+    assertEquals(6144, scheduler.getClusterResource().getMemory());
+    assertEquals(6144, scheduler.getQueueManager().getRootQueue()
+        .getSteadyFairShare().getMemory());
+    assertEquals(6144, scheduler.getQueueManager()
+        .getLeafQueue("default", false).getSteadyFairShare().getMemory());
+
+    // Submit one application
+    ApplicationAttemptId appAttemptId1 = createAppAttemptId(1, 1);
+    createApplicationWithAMResource(appAttemptId1, "default", "user1", null);
+    assertEquals(3072, scheduler.getQueueManager()
+        .getLeafQueue("default", false).getSteadyFairShare().getMemory());
+    assertEquals(3072, scheduler.getQueueManager()
+        .getLeafQueue("user1", false).getSteadyFairShare().getMemory());
+  }
+
   /**
    * Make allocation requests and ensure they are reflected in queue demand.
    */

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

@@ -109,13 +109,15 @@ public void testFairShareNoAppsRunning() throws IOException {
 
     for (FSLeafQueue leaf : leafQueues) {
       if (leaf.getName().startsWith("root.parentA")) {
-        assertEquals(0, (double) leaf.getFairShare().getMemory() / nodeCapacity
+        assertEquals(0, (double) leaf.getFairShare().getMemory() / nodeCapacity,
-            * 100, 0);
+            0);
       } else if (leaf.getName().startsWith("root.parentB")) {
-        assertEquals(0, (double) leaf.getFairShare().getMemory() / nodeCapacity
+        assertEquals(0, (double) leaf.getFairShare().getMemory() / nodeCapacity,
-            * 100, 0.1);
+            0);
       }
     }
+
+    verifySteadyFairShareMemory(leafQueues, nodeCapacity);
   }
 
   @Test
@@ -135,14 +137,15 @@ public void testFairShareOneAppRunning() throws IOException {
         100,
         (double) scheduler.getQueueManager()
             .getLeafQueue("root.parentA.childA1", false).getFairShare()
-            .getMemory()
+            .getMemory() / nodeCapacity * 100, 0.1);
-            / nodeCapacity * 100, 0.1);
     assertEquals(
         0,
         (double) scheduler.getQueueManager()
             .getLeafQueue("root.parentA.childA2", false).getFairShare()
-            .getMemory()
+            .getMemory() / nodeCapacity, 0.1);
-            / nodeCapacity * 100, 0.1);
+
+    verifySteadyFairShareMemory(scheduler.getQueueManager().getLeafQueues(),
+        nodeCapacity);
   }
 
   @Test
@@ -167,6 +170,9 @@ public void testFairShareMultipleActiveQueuesUnderSameParent()
               .getMemory()
               / nodeCapacity * 100, .9);
     }
+
+    verifySteadyFairShareMemory(scheduler.getQueueManager().getLeafQueues(),
+        nodeCapacity);
   }
 
   @Test
@@ -206,6 +212,9 @@ public void testFairShareMultipleActiveQueuesUnderDifferentParent()
             .getLeafQueue("root.parentB.childB1", false).getFairShare()
             .getMemory()
             / nodeCapacity * 100, .9);
+
+    verifySteadyFairShareMemory(scheduler.getQueueManager().getLeafQueues(),
+        nodeCapacity);
   }
 
   @Test
@@ -253,6 +262,9 @@ public void testFairShareResetsToZeroWhenAppsComplete() throws IOException {
             .getLeafQueue("root.parentA.childA2", false).getFairShare()
             .getMemory()
             / nodeCapacity * 100, 0.1);
+
+    verifySteadyFairShareMemory(scheduler.getQueueManager().getLeafQueues(),
+        nodeCapacity);
   }
 
   @Test
@@ -304,5 +316,45 @@ public void testFairShareWithDRFMultipleActiveQueuesUnderDifferentParent()
             .getLeafQueue("root.parentB.childB1", false).getFairShare()
             .getVirtualCores()
             / nodeVCores * 100, .9);
+    Collection<FSLeafQueue> leafQueues = scheduler.getQueueManager()
+        .getLeafQueues();
+
+    for (FSLeafQueue leaf : leafQueues) {
+      if (leaf.getName().startsWith("root.parentA")) {
+        assertEquals(0.2,
+            (double) leaf.getSteadyFairShare().getMemory() / nodeMem, 0.001);
+        assertEquals(0.2,
+            (double) leaf.getSteadyFairShare().getVirtualCores() / nodeVCores,
+            0.001);
+      } else if (leaf.getName().startsWith("root.parentB")) {
+        assertEquals(0.05,
+            (double) leaf.getSteadyFairShare().getMemory() / nodeMem, 0.001);
+        assertEquals(0.1,
+            (double) leaf.getSteadyFairShare().getVirtualCores() / nodeVCores,
+            0.001);
+      }
+    }
+  }
+
+  /**
+   * Verify whether steady fair shares for all leaf queues still follow
+   * their weight, not related to active/inactive status.
+   *
+   * @param leafQueues
+   * @param nodeCapacity
+   */
+  private void verifySteadyFairShareMemory(Collection<FSLeafQueue> leafQueues,
+      int nodeCapacity) {
+    for (FSLeafQueue leaf : leafQueues) {
+      if (leaf.getName().startsWith("root.parentA")) {
+        assertEquals(0.2,
+            (double) leaf.getSteadyFairShare().getMemory() / nodeCapacity,
+            0.001);
+      } else if (leaf.getName().startsWith("root.parentB")) {
+        assertEquals(0.05,
+            (double) leaf.getSteadyFairShare().getMemory() / nodeCapacity,
+            0.001);
+      }
+    }
   }
 }