YARN-3293. Track and display capacity scheduler health metrics in web

UI. Contributed by Varun Vasudev

hadoop-yarn-project/CHANGES.txt

@@ -104,6 +104,9 @@ Release 2.8.0 - UNRELEASED
     YARN-3294. Allow dumping of Capacity Scheduler debug logs via
     web UI for a fixed time period. (Varun Vasudev via xgong)
 
+    YARN-3293. Track and display capacity scheduler health metrics
+    in web UI. (Varun Vasudev via xgong)
+
   OPTIMIZATIONS
 
     YARN-3339. TestDockerContainerExecutor should pull a single image and not

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

@@ -552,4 +552,12 @@ public int getActiveApps() {
   public MetricsSystem getMetricsSystem() {
     return metricsSystem;
   }
+
+  public long getAggregateAllocatedContainers() {
+    return aggregateContainersAllocated.value();
+  }
+
+  public long getAggegatedReleasedContainers() {
+    return aggregateContainersReleased.value();
+  }
 }

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

@@ -0,0 +1,236 @@
+/**
+ * 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;
+
+import org.apache.hadoop.yarn.api.records.ContainerId;
+import org.apache.hadoop.yarn.api.records.NodeId;
+import org.apache.hadoop.yarn.api.records.Resource;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class SchedulerHealth {
+
+  static public class DetailedInformation {
+    long timestamp;
+    NodeId nodeId;
+    ContainerId containerId;
+    String queue;
+
+    public DetailedInformation(long timestamp, NodeId nodeId,
+        ContainerId containerId, String queue) {
+      this.timestamp = timestamp;
+      this.nodeId = nodeId;
+      this.containerId = containerId;
+      this.queue = queue;
+    }
+
+    public long getTimestamp() {
+      return timestamp;
+    }
+
+    public NodeId getNodeId() {
+      return nodeId;
+    }
+
+    public ContainerId getContainerId() {
+      return containerId;
+    }
+
+    public String getQueue() {
+      return queue;
+    }
+  }
+
+  enum Operation {
+    ALLOCATION, RELEASE, PREEMPTION, RESERVATION, FULFILLED_RESERVATION
+  }
+
+  long lastSchedulerRunTime;
+  Map<Operation, Resource> lastSchedulerRunDetails;
+  Map<Operation, DetailedInformation> schedulerHealthDetails;
+  Map<Operation, Long> schedulerOperationCounts;
+  // this is for counts since the RM started, never reset
+  Map<Operation, Long> schedulerOperationAggregateCounts;
+
+  public SchedulerHealth() {
+    lastSchedulerRunDetails = new ConcurrentHashMap<>();
+    schedulerHealthDetails = new ConcurrentHashMap<>();
+    schedulerOperationCounts = new ConcurrentHashMap<>();
+    schedulerOperationAggregateCounts = new ConcurrentHashMap<>();
+    for (Operation op : Operation.values()) {
+      lastSchedulerRunDetails.put(op, Resource.newInstance(0, 0));
+      schedulerOperationCounts.put(op, 0L);
+      schedulerHealthDetails.put(op, new DetailedInformation(0, null, null,
+        null));
+      schedulerOperationAggregateCounts.put(op, 0L);
+    }
+
+  }
+
+  public void updateAllocation(long timestamp, NodeId nodeId,
+      ContainerId containerId, String queue) {
+    DetailedInformation di =
+        new DetailedInformation(timestamp, nodeId, containerId, queue);
+    schedulerHealthDetails.put(Operation.ALLOCATION, di);
+  }
+
+  public void updateRelease(long timestamp, NodeId nodeId,
+      ContainerId containerId, String queue) {
+    DetailedInformation di =
+        new DetailedInformation(timestamp, nodeId, containerId, queue);
+    schedulerHealthDetails.put(Operation.RELEASE, di);
+  }
+
+  public void updatePreemption(long timestamp, NodeId nodeId,
+      ContainerId containerId, String queue) {
+    DetailedInformation di =
+        new DetailedInformation(timestamp, nodeId, containerId, queue);
+    schedulerHealthDetails.put(Operation.PREEMPTION, di);
+  }
+
+  public void updateReservation(long timestamp, NodeId nodeId,
+      ContainerId containerId, String queue) {
+    DetailedInformation di =
+        new DetailedInformation(timestamp, nodeId, containerId, queue);
+    schedulerHealthDetails.put(Operation.RESERVATION, di);
+  }
+
+  public void updateSchedulerRunDetails(long timestamp, Resource allocated,
+      Resource reserved) {
+    lastSchedulerRunTime = timestamp;
+    lastSchedulerRunDetails.put(Operation.ALLOCATION, allocated);
+    lastSchedulerRunDetails.put(Operation.RESERVATION, reserved);
+  }
+
+  public void updateSchedulerReleaseDetails(long timestamp, Resource released) {
+    lastSchedulerRunTime = timestamp;
+    lastSchedulerRunDetails.put(Operation.RELEASE, released);
+  }
+
+  public void updateSchedulerReleaseCounts(long count) {
+    updateCounts(Operation.RELEASE, count);
+  }
+
+  public void updateSchedulerAllocationCounts(long count) {
+    updateCounts(Operation.ALLOCATION, count);
+  }
+
+  public void updateSchedulerReservationCounts(long count) {
+    updateCounts(Operation.RESERVATION, count);
+  }
+
+  public void updateSchedulerFulfilledReservationCounts(long count) {
+    updateCounts(Operation.FULFILLED_RESERVATION, count);
+  }
+
+  public void updateSchedulerPreemptionCounts(long count) {
+    updateCounts(Operation.PREEMPTION, count);
+  }
+
+  private void updateCounts(Operation op, long count) {
+    schedulerOperationCounts.put(op, count);
+    Long tmp = schedulerOperationAggregateCounts.get(op);
+    schedulerOperationAggregateCounts.put(op, tmp + count);
+  }
+
+  public long getLastSchedulerRunTime() {
+    return lastSchedulerRunTime;
+  }
+
+  private Resource getResourceDetails(Operation op) {
+    return lastSchedulerRunDetails.get(op);
+  }
+
+  public Resource getResourcesAllocated() {
+    return getResourceDetails(Operation.ALLOCATION);
+  }
+
+  public Resource getResourcesReserved() {
+    return getResourceDetails(Operation.RESERVATION);
+  }
+
+  public Resource getResourcesReleased() {
+    return getResourceDetails(Operation.RELEASE);
+  }
+
+  private DetailedInformation getDetailedInformation(Operation op) {
+    return schedulerHealthDetails.get(op);
+  }
+
+  public DetailedInformation getLastAllocationDetails() {
+    return getDetailedInformation(Operation.ALLOCATION);
+  }
+
+  public DetailedInformation getLastReleaseDetails() {
+    return getDetailedInformation(Operation.RELEASE);
+  }
+
+  public DetailedInformation getLastReservationDetails() {
+    return getDetailedInformation(Operation.RESERVATION);
+  }
+
+  public DetailedInformation getLastPreemptionDetails() {
+    return getDetailedInformation(Operation.PREEMPTION);
+  }
+
+  private Long getOperationCount(Operation op) {
+    return schedulerOperationCounts.get(op);
+  }
+
+  public Long getAllocationCount() {
+    return getOperationCount(Operation.ALLOCATION);
+  }
+
+  public Long getReleaseCount() {
+    return getOperationCount(Operation.RELEASE);
+  }
+
+  public Long getReservationCount() {
+    return getOperationCount(Operation.RESERVATION);
+  }
+
+  public Long getPreemptionCount() {
+    return getOperationCount(Operation.PREEMPTION);
+  }
+
+  private Long getAggregateOperationCount(Operation op) {
+    return schedulerOperationAggregateCounts.get(op);
+  }
+
+  public Long getAggregateAllocationCount() {
+    return getAggregateOperationCount(Operation.ALLOCATION);
+  }
+
+  public Long getAggregateReleaseCount() {
+    return getAggregateOperationCount(Operation.RELEASE);
+  }
+
+  public Long getAggregateReservationCount() {
+    return getAggregateOperationCount(Operation.RESERVATION);
+  }
+
+  public Long getAggregatePreemptionCount() {
+    return getAggregateOperationCount(Operation.PREEMPTION);
+  }
+
+  public Long getAggregateFulFilledReservationsCount() {
+    return getAggregateOperationCount(Operation.FULFILLED_RESERVATION);
+  }
+}

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

@@ -22,40 +22,46 @@
 import org.apache.hadoop.yarn.api.records.Resource;
 import org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainer;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.NodeType;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.AssignmentInformation;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerApp;
-import org.apache.hadoop.yarn.util.resource.Resources;
 
 @Private
 @Unstable
 public class CSAssignment {
+
   final private Resource resource;
   private NodeType type;
   private final RMContainer excessReservation;
   private final FiCaSchedulerApp application;
   private final boolean skipped;
+  private boolean fulfilledReservation;
+  private final AssignmentInformation assignmentInformation;
 
   public CSAssignment(Resource resource, NodeType type) {
-    this.resource = resource;
+    this(resource, type, null, null, false, false);
-    this.type = type;
-    this.application = null;
-    this.excessReservation = null;
-    this.skipped = false;
   }
 
-  public CSAssignment(FiCaSchedulerApp application, RMContainer excessReservation) {
+  public CSAssignment(FiCaSchedulerApp application,
-    this.resource = excessReservation.getContainer().getResource();
+      RMContainer excessReservation) {
-    this.type = NodeType.NODE_LOCAL;
+    this(excessReservation.getContainer().getResource(), NodeType.NODE_LOCAL,
-    this.application = application;
+      excessReservation, application, false, false);
-    this.excessReservation = excessReservation;
-    this.skipped = false;
   }
 
   public CSAssignment(boolean skipped) {
-    this.resource = Resources.createResource(0, 0);
+    this(Resource.newInstance(0, 0), NodeType.NODE_LOCAL, null, null, skipped,
-    this.type = NodeType.NODE_LOCAL;
+      false);
-    this.application = null;
+  }
-    this.excessReservation = null;
+
+  public CSAssignment(Resource resource, NodeType type,
+      RMContainer excessReservation, FiCaSchedulerApp application,
+      boolean skipped, boolean fulfilledReservation) {
+    this.resource = resource;
+    this.type = type;
+    this.excessReservation = excessReservation;
+    this.application = application;
     this.skipped = skipped;
+    this.fulfilledReservation = fulfilledReservation;
+    this.assignmentInformation = new AssignmentInformation();
   }
 
   public Resource getResource() {
@@ -84,6 +90,35 @@ public boolean getSkipped() {
   
   @Override
   public String toString() {
-    return resource.getMemory() + ":" + type;
+    String ret = "resource:" + resource.toString();
+    ret += "; type:" + type;
+    ret += "; excessReservation:" + excessReservation;
+    ret +=
+        "; applicationid:"
+            + (application != null ? application.getApplicationId().toString()
+                : "null");
+    ret += "; skipped:" + skipped;
+    ret += "; fulfilled reservation:" + fulfilledReservation;
+    ret +=
+        "; allocations(count/resource):"
+            + assignmentInformation.getNumAllocations() + "/"
+            + assignmentInformation.getAllocated().toString();
+    ret +=
+        "; reservations(count/resource):"
+            + assignmentInformation.getNumReservations() + "/"
+            + assignmentInformation.getReserved().toString();
+    return ret;
+  }
+  
+  public void setFulfilledReservation(boolean fulfilledReservation) {
+    this.fulfilledReservation = fulfilledReservation;
+  }
+
+  public boolean isFulfilledReservation() {
+    return this.fulfilledReservation;
+  }
+  
+  public AssignmentInformation getAssignmentInformation() {
+    return this.assignmentInformation;
   }
 }

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

@@ -45,6 +45,7 @@
 import org.apache.hadoop.security.AccessControlException;
 import org.apache.hadoop.security.Groups;
 import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.util.Time;
 import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.api.records.Container;
@@ -84,6 +85,7 @@
 import org.apache.hadoop.yarn.server.resourcemanager.rmnode.UpdatedContainerInfo;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.AbstractYarnScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.Allocation;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.NodeType;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.PreemptableResourceScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.Queue;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.QueueMetrics;
@@ -91,9 +93,11 @@
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceLimits;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerApplication;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerDynamicEditException;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerHealth;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerUtils;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration.QueueMapping;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration.QueueMapping.MappingType;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.AssignmentInformation;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.QueueEntitlement;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerApp;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerNode;
@@ -213,7 +217,8 @@ public Configuration getConf() {
   private boolean scheduleAsynchronously;
   private AsyncScheduleThread asyncSchedulerThread;
   private RMNodeLabelsManager labelManager;
-  
+  private SchedulerHealth schedulerHealth = new SchedulerHealth();
+  long lastNodeUpdateTime;
   /**
    * EXPERT
    */
@@ -955,6 +960,8 @@ private synchronized void nodeUpdate(RMNode nm) {
       LOG.debug("nodeUpdate: " + nm + " clusterResources: " + clusterResource);
     }
 
+    Resource releaseResources = Resource.newInstance(0, 0);
+
     FiCaSchedulerNode node = getNode(nm.getNodeID());
     
     List<UpdatedContainerInfo> containerInfoList = nm.pullContainerUpdates();
@@ -971,12 +978,29 @@ private synchronized void nodeUpdate(RMNode nm) {
     }
 
     // Process completed containers
+    int releasedContainers = 0;
     for (ContainerStatus completedContainer : completedContainers) {
       ContainerId containerId = completedContainer.getContainerId();
+      RMContainer container = getRMContainer(containerId);
       LOG.debug("Container FINISHED: " + containerId);
-      completedContainer(getRMContainer(containerId), 
+      completedContainer(container, completedContainer,
-          completedContainer, RMContainerEventType.FINISHED);
+        RMContainerEventType.FINISHED);
+      if (container != null) {
+        releasedContainers++;
+        Resource rs = container.getAllocatedResource();
+        if (rs != null) {
+          Resources.addTo(releaseResources, rs);
         }
+        rs = container.getReservedResource();
+        if (rs != null) {
+          Resources.addTo(releaseResources, rs);
+        }
+      }
+    }
+
+    schedulerHealth.updateSchedulerReleaseDetails(lastNodeUpdateTime,
+      releaseResources);
+    schedulerHealth.updateSchedulerReleaseCounts(releasedContainers);
 
     // Now node data structures are upto date and ready for scheduling.
     if(LOG.isDebugEnabled()) {
@@ -1040,11 +1064,47 @@ private synchronized void updateLabelsOnNode(NodeId nodeId,
     node.updateLabels(newLabels);
   }
 
+  private void updateSchedulerHealth(long now, FiCaSchedulerNode node,
+      CSAssignment assignment) {
+
+    NodeId nodeId = node.getNodeID();
+    List<AssignmentInformation.AssignmentDetails> allocations =
+        assignment.getAssignmentInformation().getAllocationDetails();
+    List<AssignmentInformation.AssignmentDetails> reservations =
+        assignment.getAssignmentInformation().getReservationDetails();
+    if (!allocations.isEmpty()) {
+      ContainerId allocatedContainerId =
+          allocations.get(allocations.size() - 1).containerId;
+      String allocatedQueue = allocations.get(allocations.size() - 1).queue;
+      schedulerHealth.updateAllocation(now, nodeId, allocatedContainerId,
+        allocatedQueue);
+    }
+    if (!reservations.isEmpty()) {
+      ContainerId reservedContainerId =
+          reservations.get(reservations.size() - 1).containerId;
+      String reservedQueue = reservations.get(reservations.size() - 1).queue;
+      schedulerHealth.updateReservation(now, nodeId, reservedContainerId,
+        reservedQueue);
+    }
+    schedulerHealth.updateSchedulerReservationCounts(assignment
+      .getAssignmentInformation().getNumReservations());
+    schedulerHealth.updateSchedulerAllocationCounts(assignment
+      .getAssignmentInformation().getNumAllocations());
+    schedulerHealth.updateSchedulerRunDetails(now, assignment
+      .getAssignmentInformation().getAllocated(), assignment
+      .getAssignmentInformation().getReserved());
+ }
+
   private synchronized void allocateContainersToNode(FiCaSchedulerNode node) {
     if (rmContext.isWorkPreservingRecoveryEnabled()
         && !rmContext.isSchedulerReadyForAllocatingContainers()) {
       return;
     }
+    // reset allocation and reservation stats before we start doing any work
+    updateSchedulerHealth(lastNodeUpdateTime, node,
+      new CSAssignment(Resources.none(), NodeType.NODE_LOCAL));
+
+    CSAssignment assignment;
 
     // Assign new containers...
     // 1. Check for reserved applications
@@ -1061,14 +1121,25 @@ private synchronized void allocateContainersToNode(FiCaSchedulerNode node) {
           node.getNodeID());
       
       LeafQueue queue = ((LeafQueue)reservedApplication.getQueue());
-      CSAssignment assignment =
+      assignment = queue.assignContainers(
-          queue.assignContainers(
               clusterResource,
               node,
               // TODO, now we only consider limits for parent for non-labeled
               // resources, should consider labeled resources as well.
               new ResourceLimits(labelManager.getResourceByLabel(
                   RMNodeLabelsManager.NO_LABEL, clusterResource)));
+      if (assignment.isFulfilledReservation()) {
+        CSAssignment tmp =
+            new CSAssignment(reservedContainer.getReservedResource(),
+              assignment.getType());
+        Resources.addTo(assignment.getAssignmentInformation().getAllocated(),
+          reservedContainer.getReservedResource());
+        tmp.getAssignmentInformation().addAllocationDetails(
+          reservedContainer.getContainerId(), queue.getQueuePath());
+        tmp.getAssignmentInformation().incrAllocations();
+        updateSchedulerHealth(lastNodeUpdateTime, node, tmp);
+        schedulerHealth.updateSchedulerFulfilledReservationCounts(1);
+      }
 
       RMContainer excessReservation = assignment.getExcessReservation();
       if (excessReservation != null) {
@@ -1092,13 +1163,14 @@ private synchronized void allocateContainersToNode(FiCaSchedulerNode node) {
           LOG.debug("Trying to schedule on node: " + node.getNodeName() +
               ", available: " + node.getAvailableResource());
         }
-        root.assignContainers(
+        assignment = root.assignContainers(
             clusterResource,
             node,
             // TODO, now we only consider limits for parent for non-labeled
             // resources, should consider labeled resources as well.
             new ResourceLimits(labelManager.getResourceByLabel(
                 RMNodeLabelsManager.NO_LABEL, clusterResource)));
+        updateSchedulerHealth(lastNodeUpdateTime, node, assignment);
       }
     } else {
       LOG.info("Skipping scheduling since node " + node.getNodeID() + 
@@ -1151,6 +1223,7 @@ public void handle(SchedulerEvent event) {
     {
       NodeUpdateSchedulerEvent nodeUpdatedEvent = (NodeUpdateSchedulerEvent)event;
       RMNode node = nodeUpdatedEvent.getRMNode();
+      setLastNodeUpdateTime(Time.now());
       nodeUpdate(node);
       if (!scheduleAsynchronously) {
         allocateContainersToNode(getNode(node.getNodeID()));
@@ -1319,6 +1392,14 @@ protected synchronized void completedContainer(RMContainer rmContainer,
     LOG.info("Application attempt " + application.getApplicationAttemptId()
         + " released container " + container.getId() + " on node: " + node
         + " with event: " + event);
+    if (containerStatus.getExitStatus() == ContainerExitStatus.PREEMPTED) {
+      schedulerHealth.updatePreemption(Time.now(), container.getNodeId(),
+        container.getId(), queue.getQueuePath());
+      schedulerHealth.updateSchedulerPreemptionCounts(1);
+    } else {
+      schedulerHealth.updateRelease(lastNodeUpdateTime, container.getNodeId(),
+        container.getId(), queue.getQueuePath());
+    }
   }
 
   @Lock(Lock.NoLock.class)
@@ -1648,4 +1729,12 @@ public Set<String> getPlanQueues() {
     }
     return ret;
   }
+
+  public SchedulerHealth getSchedulerHealth() {
+    return this.schedulerHealth;
+  }
+
+  private synchronized void setLastNodeUpdateTime(long time) {
+    this.lastNodeUpdateTime = time;
+  }
 }

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

@@ -913,12 +913,17 @@ private synchronized CSAssignment assignReservedContainer(
     }
 
     // Try to assign if we have sufficient resources
+    CSAssignment tmp =
         assignContainersOnNode(clusterResource, node, application, priority,
           rmContainer);
     
     // Doesn't matter... since it's already charged for at time of reservation
     // "re-reservation" is *free*
-    return new CSAssignment(Resources.none(), NodeType.NODE_LOCAL);
+    CSAssignment ret = new CSAssignment(Resources.none(), NodeType.NODE_LOCAL);
+    if (tmp.getAssignmentInformation().getNumAllocations() > 0) {
+      ret.setFulfilledReservation(true);
+    }
+    return ret;
   }
   
   protected Resource getHeadroom(User user, Resource queueCurrentLimit,
@@ -1172,7 +1177,8 @@ resourceCalculator, required, getMaximumAllocation()
   private CSAssignment assignContainersOnNode(Resource clusterResource,
       FiCaSchedulerNode node, FiCaSchedulerApp application, Priority priority,
       RMContainer reservedContainer) {
-    Resource assigned = Resources.none();
+
+    CSAssignment assigned;
 
     NodeType requestType = null;
     MutableObject allocatedContainer = new MutableObject();
@@ -1186,14 +1192,15 @@ private CSAssignment assignContainersOnNode(Resource clusterResource,
             node, application, priority, reservedContainer,
             allocatedContainer);
       if (Resources.greaterThan(resourceCalculator, clusterResource,
-          assigned, Resources.none())) {
+        assigned.getResource(), Resources.none())) {
 
         //update locality statistics
         if (allocatedContainer.getValue() != null) {
           application.incNumAllocatedContainers(NodeType.NODE_LOCAL,
             requestType);
         }
-        return new CSAssignment(assigned, NodeType.NODE_LOCAL);
+        assigned.setType(NodeType.NODE_LOCAL);
+        return assigned;
       }
     }
 
@@ -1214,14 +1221,15 @@ private CSAssignment assignContainersOnNode(Resource clusterResource,
             node, application, priority, reservedContainer,
             allocatedContainer);
       if (Resources.greaterThan(resourceCalculator, clusterResource,
-          assigned, Resources.none())) {
+        assigned.getResource(), Resources.none())) {
 
         //update locality statistics
         if (allocatedContainer.getValue() != null) {
           application.incNumAllocatedContainers(NodeType.RACK_LOCAL,
             requestType);
         }
-        return new CSAssignment(assigned, NodeType.RACK_LOCAL);
+        assigned.setType(NodeType.RACK_LOCAL);
+        return assigned;
       }
     }
     
@@ -1246,7 +1254,8 @@ private CSAssignment assignContainersOnNode(Resource clusterResource,
       if (allocatedContainer.getValue() != null) {
         application.incNumAllocatedContainers(NodeType.OFF_SWITCH, requestType);
       }
-      return new CSAssignment(assigned, NodeType.OFF_SWITCH);
+      assigned.setType(NodeType.OFF_SWITCH);
+      return assigned;
     }
     
     return SKIP_ASSIGNMENT;
@@ -1255,10 +1264,9 @@ private CSAssignment assignContainersOnNode(Resource clusterResource,
   private Resource getMinimumResourceNeedUnreserved(Resource askedResource) {
     // First we need to get minimum resource we need unreserve
     // minimum-resource-need-unreserve = used + asked - limit
-    Resource minimumUnreservedResource =
+    return Resources.subtract(
-        Resources.subtract(Resources.add(queueUsage.getUsed(), askedResource),
+      Resources.add(queueUsage.getUsed(), askedResource),
       currentResourceLimits.getLimit());
-    return minimumUnreservedResource;
   }
 
   @Private
@@ -1334,7 +1342,7 @@ protected boolean checkLimitsToReserve(Resource clusterResource,
   }
 
 
-  private Resource assignNodeLocalContainers(Resource clusterResource,
+  private CSAssignment assignNodeLocalContainers(Resource clusterResource,
       ResourceRequest nodeLocalResourceRequest, FiCaSchedulerNode node,
       FiCaSchedulerApp application, Priority priority,
       RMContainer reservedContainer, MutableObject allocatedContainer) {
@@ -1345,10 +1353,10 @@ private Resource assignNodeLocalContainers(Resource clusterResource,
           allocatedContainer);
     }
 
-    return Resources.none();
+    return new CSAssignment(Resources.none(), NodeType.NODE_LOCAL);
   }
 
-  private Resource assignRackLocalContainers(Resource clusterResource,
+  private CSAssignment assignRackLocalContainers(Resource clusterResource,
       ResourceRequest rackLocalResourceRequest, FiCaSchedulerNode node,
       FiCaSchedulerApp application, Priority priority,
       RMContainer reservedContainer, MutableObject allocatedContainer) {
@@ -1359,10 +1367,10 @@ private Resource assignRackLocalContainers(Resource clusterResource,
           allocatedContainer);
     }
 
-    return Resources.none();
+    return new CSAssignment(Resources.none(), NodeType.RACK_LOCAL);
   }
 
-  private Resource assignOffSwitchContainers(Resource clusterResource,
+  private CSAssignment assignOffSwitchContainers(Resource clusterResource,
       ResourceRequest offSwitchResourceRequest, FiCaSchedulerNode node,
       FiCaSchedulerApp application, Priority priority,
       RMContainer reservedContainer, MutableObject allocatedContainer) {
@@ -1373,7 +1381,7 @@ private Resource assignOffSwitchContainers(Resource clusterResource,
           allocatedContainer);
     }
     
-    return Resources.none();
+    return new CSAssignment(Resources.none(), NodeType.OFF_SWITCH);
   }
 
   boolean canAssign(FiCaSchedulerApp application, Priority priority, 
@@ -1443,15 +1451,13 @@ Container createContainer(FiCaSchedulerApp application, FiCaSchedulerNode node,
         .getApplicationAttemptId(), application.getNewContainerId());
   
     // Create the container
-    Container container =
+    return BuilderUtils.newContainer(containerId, nodeId, node.getRMNode()
-        BuilderUtils.newContainer(containerId, nodeId, node.getRMNode()
       .getHttpAddress(), capability, priority, null);
 
-    return container;
   }
 
 
-  private Resource assignContainer(Resource clusterResource, FiCaSchedulerNode node, 
+  private CSAssignment assignContainer(Resource clusterResource, FiCaSchedulerNode node,
       FiCaSchedulerApp application, Priority priority, 
       ResourceRequest request, NodeType type, RMContainer rmContainer,
       MutableObject createdContainer) {
@@ -1472,7 +1478,7 @@ private Resource assignContainer(Resource clusterResource, FiCaSchedulerNode nod
       if (rmContainer != null) {
         unreserve(application, priority, node, rmContainer);
       }
-      return Resources.none();
+      return new CSAssignment(Resources.none(), type);
     }
     
     Resource capability = request.getCapability();
@@ -1484,7 +1490,7 @@ private Resource assignContainer(Resource clusterResource, FiCaSchedulerNode nod
       LOG.warn("Node : " + node.getNodeID()
           + " does not have sufficient resource for request : " + request
           + " node total capability : " + node.getTotalResource());
-      return Resources.none();
+      return new CSAssignment(Resources.none(), type);
     }
 
     assert Resources.greaterThan(
@@ -1497,7 +1503,7 @@ private Resource assignContainer(Resource clusterResource, FiCaSchedulerNode nod
     // something went wrong getting/creating the container 
     if (container == null) {
       LOG.warn("Couldn't get container for allocation!");
-      return Resources.none();
+      return new CSAssignment(Resources.none(), type);
     }
     
     boolean shouldAllocOrReserveNewContainer = shouldAllocOrReserveNewContainer(
@@ -1529,7 +1535,7 @@ private Resource assignContainer(Resource clusterResource, FiCaSchedulerNode nod
           // container (That means we *have to* unreserve some resource to
           // continue)). If we failed to unreserve some resource,
           if (!containerUnreserved) {
-            return Resources.none();
+            return new CSAssignment(Resources.none(), type);
           }
         }
       }
@@ -1540,7 +1546,7 @@ private Resource assignContainer(Resource clusterResource, FiCaSchedulerNode nod
 
       // Does the application need this resource?
       if (allocatedContainer == null) {
-        return Resources.none();
+        return new CSAssignment(Resources.none(), type);
       }
 
       // Inform the node
@@ -1552,7 +1558,13 @@ private Resource assignContainer(Resource clusterResource, FiCaSchedulerNode nod
           " queue=" + this + 
           " clusterResource=" + clusterResource);
       createdContainer.setValue(allocatedContainer);
-      return container.getResource();
+      CSAssignment assignment = new CSAssignment(container.getResource(), type);
+      assignment.getAssignmentInformation().addAllocationDetails(
+        container.getId(), getQueuePath());
+      assignment.getAssignmentInformation().incrAllocations();
+      Resources.addTo(assignment.getAssignmentInformation().getAllocated(),
+        container.getResource());
+      return assignment;
     } else {
       // if we are allowed to allocate but this node doesn't have space, reserve it or
       // if this was an already a reserved container, reserve it again
@@ -1566,7 +1578,7 @@ private Resource assignContainer(Resource clusterResource, FiCaSchedulerNode nod
           // reserve the new container
           if (!checkLimitsToReserve(clusterResource, 
               application, capability)) {
-            return Resources.none();
+            return new CSAssignment(Resources.none(), type);
           }
         }
 
@@ -1581,10 +1593,16 @@ private Resource assignContainer(Resource clusterResource, FiCaSchedulerNode nod
             " absoluteUsedCapacity=" + getAbsoluteUsedCapacity() + 
             " used=" + queueUsage.getUsed() +
             " cluster=" + clusterResource);
-
+        CSAssignment assignment =
-        return request.getCapability();
+            new CSAssignment(request.getCapability(), type);
+        assignment.getAssignmentInformation().addReservationDetails(
+          container.getId(), getQueuePath());
+        assignment.getAssignmentInformation().incrReservations();
+        Resources.addTo(assignment.getAssignmentInformation().getReserved(),
+          request.getCapability());
+        return assignment;
       }
-      return Resources.none();
+      return new CSAssignment(Resources.none(), type);
     }
   }
 

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

@@ -57,6 +57,7 @@
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceLimits;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerApplicationAttempt;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerUtils;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.AssignmentInformation;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerApp;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerNode;
 import org.apache.hadoop.yarn.util.resource.Resources;
@@ -415,7 +416,27 @@ public synchronized CSAssignment assignContainers(Resource clusterResource,
             nodeLabels);
         
         // Track resource utilization in this pass of the scheduler
-        Resources.addTo(assignment.getResource(), assignedToChild.getResource());
+        Resources
+          .addTo(assignment.getResource(), assignedToChild.getResource());
+        Resources.addTo(assignment.getAssignmentInformation().getAllocated(),
+          assignedToChild.getAssignmentInformation().getAllocated());
+        Resources.addTo(assignment.getAssignmentInformation().getReserved(),
+            assignedToChild.getAssignmentInformation().getReserved());
+        assignment.getAssignmentInformation().incrAllocations(
+          assignedToChild.getAssignmentInformation().getNumAllocations());
+        assignment.getAssignmentInformation().incrReservations(
+          assignedToChild.getAssignmentInformation().getNumReservations());
+        assignment
+          .getAssignmentInformation()
+          .getAllocationDetails()
+          .addAll(
+              assignedToChild.getAssignmentInformation().getAllocationDetails());
+        assignment
+          .getAssignmentInformation()
+          .getReservationDetails()
+          .addAll(
+              assignedToChild.getAssignmentInformation()
+                  .getReservationDetails());
         
         LOG.info("assignedContainer" +
             " queue=" + getQueueName() + 

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

@@ -0,0 +1,120 @@
+/**
+ * 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.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.yarn.api.records.ContainerId;
+import org.apache.hadoop.yarn.api.records.Resource;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@InterfaceAudience.Private
+@InterfaceStability.Unstable
+public class AssignmentInformation {
+
+  public enum Operation {
+    ALLOCATION, RESERVATION
+  }
+
+  public static class AssignmentDetails {
+    public ContainerId containerId;
+    public String queue;
+
+    public AssignmentDetails(ContainerId containerId, String queue) {
+      this.containerId = containerId;
+      this.queue = queue;
+    }
+  }
+
+  private final Map<Operation, Integer> operationCounts;
+  private final Map<Operation, Resource> operationResources;
+  private final Map<Operation, List<AssignmentDetails>> operationDetails;
+
+  public AssignmentInformation() {
+    this.operationCounts = new HashMap<>();
+    this.operationResources = new HashMap<>();
+    this.operationDetails = new HashMap<>();
+    for (Operation op : Operation.values()) {
+      operationCounts.put(op, 0);
+      operationResources.put(op, Resource.newInstance(0, 0));
+      operationDetails.put(op, new ArrayList<AssignmentDetails>());
+    }
+  }
+
+  public int getNumAllocations() {
+    return operationCounts.get(Operation.ALLOCATION);
+  }
+
+  public void incrAllocations() {
+    increment(Operation.ALLOCATION, 1);
+  }
+
+  public void incrAllocations(int by) {
+    increment(Operation.ALLOCATION, by);
+  }
+
+  public int getNumReservations() {
+    return operationCounts.get(Operation.RESERVATION);
+  }
+
+  public void incrReservations() {
+    increment(Operation.RESERVATION, 1);
+  }
+
+  public void incrReservations(int by) {
+    increment(Operation.RESERVATION, by);
+  }
+
+  private void increment(Operation op, int by) {
+    operationCounts.put(op, operationCounts.get(op) + by);
+  }
+
+  public Resource getAllocated() {
+    return operationResources.get(Operation.ALLOCATION);
+  }
+
+  public Resource getReserved() {
+    return operationResources.get(Operation.RESERVATION);
+  }
+
+  private void addAssignmentDetails(Operation op, ContainerId containerId,
+      String queue) {
+    operationDetails.get(op).add(new AssignmentDetails(containerId, queue));
+  }
+
+  public void addAllocationDetails(ContainerId containerId, String queue) {
+    addAssignmentDetails(Operation.ALLOCATION, containerId, queue);
+  }
+
+  public void addReservationDetails(ContainerId containerId, String queue) {
+    addAssignmentDetails(Operation.RESERVATION, containerId, queue);
+  }
+
+  public List<AssignmentDetails> getAllocationDetails() {
+    return operationDetails.get(Operation.ALLOCATION);
+  }
+
+  public List<AssignmentDetails> getReservationDetails() {
+    return operationDetails.get(Operation.RESERVATION);
+  }
+}

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

@@ -21,17 +21,19 @@
 import static org.apache.hadoop.yarn.util.StringHelper.join;
 
 import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
 
 import org.apache.hadoop.util.StringUtils;
 import org.apache.hadoop.yarn.server.resourcemanager.ResourceManager;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerHealth;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CSQueue;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.UserInfo;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.CapacitySchedulerInfo;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.CapacitySchedulerLeafQueueInfo;
 import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.CapacitySchedulerQueueInfo;
-import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.ResourceInfo;
+import org.apache.hadoop.yarn.util.Times;
-import org.apache.hadoop.yarn.server.webapp.AppsBlock;
 import org.apache.hadoop.yarn.webapp.ResponseInfo;
 import org.apache.hadoop.yarn.webapp.SubView;
 import org.apache.hadoop.yarn.webapp.hamlet.Hamlet;
@@ -244,7 +246,7 @@ public void render(Block html) {
               span(".q", "default")._()._();
       } else {
         CSQueue root = cs.getRootQueue();
-        CapacitySchedulerInfo sinfo = new CapacitySchedulerInfo(root);
+        CapacitySchedulerInfo sinfo = new CapacitySchedulerInfo(root, cs);
         csqinfo.csinfo = sinfo;
         csqinfo.qinfo = null;
 
@@ -274,6 +276,95 @@ public void render(Block html) {
       script().$type("text/javascript").
           _("$('#cs').hide();")._()._().
       _(RMAppsBlock.class);
+      html._(HealthBlock.class);
+    }
+  }
+
+  public static class HealthBlock extends HtmlBlock {
+
+    final CapacityScheduler cs;
+
+    @Inject
+    HealthBlock(ResourceManager rm) {
+      cs = (CapacityScheduler) rm.getResourceScheduler();
+    }
+
+    @Override
+    public void render(HtmlBlock.Block html) {
+      SchedulerHealth healthInfo = cs.getSchedulerHealth();
+      DIV<Hamlet> div = html.div("#health");
+      div.h4("Aggregate scheduler counts");
+      TBODY<TABLE<DIV<Hamlet>>> tbody =
+          div.table("#lastrun").thead().$class("ui-widget-header").tr().th()
+            .$class("ui-state-default")._("Total Container Allocations(count)")
+            ._().th().$class("ui-state-default")
+            ._("Total Container Releases(count)")._().th()
+            .$class("ui-state-default")
+            ._("Total Fulfilled Reservations(count)")._().th()
+            .$class("ui-state-default")._("Total Container Preemptions(count)")
+            ._()._()._().tbody();
+      tbody
+        .$class("ui-widget-content")
+        .tr()
+        .td(
+          String.valueOf(cs.getRootQueueMetrics()
+            .getAggregateAllocatedContainers()))
+        .td(
+          String.valueOf(cs.getRootQueueMetrics()
+            .getAggegatedReleasedContainers()))
+        .td(healthInfo.getAggregateFulFilledReservationsCount().toString())
+        .td(healthInfo.getAggregatePreemptionCount().toString())._()._()._();
+      div.h4("Last scheduler run");
+      tbody =
+          div.table("#lastrun").thead().$class("ui-widget-header").tr().th()
+            .$class("ui-state-default")._("Time")._().th()
+            .$class("ui-state-default")._("Allocations(count - resources)")._()
+            .th().$class("ui-state-default")._("Reservations(count - resources)")
+            ._().th().$class("ui-state-default")._("Releases(count - resources)")
+            ._()._()._().tbody();
+      tbody
+        .$class("ui-widget-content")
+        .tr()
+        .td(Times.format(healthInfo.getLastSchedulerRunTime()))
+        .td(
+          healthInfo.getAllocationCount().toString() + " - "
+              + healthInfo.getResourcesAllocated().toString())
+        .td(
+          healthInfo.getReservationCount().toString() + " - "
+              + healthInfo.getResourcesReserved().toString())
+        .td(
+          healthInfo.getReleaseCount().toString() + " - "
+              + healthInfo.getResourcesReleased().toString())._()._()._();
+      Map<String, SchedulerHealth.DetailedInformation> info = new HashMap<>();
+      info.put("Allocation", healthInfo.getLastAllocationDetails());
+      info.put("Reservation", healthInfo.getLastReservationDetails());
+      info.put("Release", healthInfo.getLastReleaseDetails());
+      info.put("Preemption", healthInfo.getLastPreemptionDetails());
+
+      for (Map.Entry<String, SchedulerHealth.DetailedInformation> entry : info
+        .entrySet()) {
+        String containerId = "N/A";
+        String nodeId = "N/A";
+        String queue = "N/A";
+        String table = "#" + entry.getKey();
+        div.h4("Last " + entry.getKey());
+        tbody =
+            div.table(table).thead().$class("ui-widget-header").tr().th()
+              .$class("ui-state-default")._("Time")._().th()
+              .$class("ui-state-default")._("Container Id")._().th()
+              .$class("ui-state-default")._("Node Id")._().th()
+              .$class("ui-state-default")._("Queue")._()._()._().tbody();
+        SchedulerHealth.DetailedInformation di = entry.getValue();
+        if (di.getTimestamp() != 0) {
+          containerId = di.getContainerId().toString();
+          nodeId = di.getNodeId().toString();
+          queue = di.getQueue();
+        }
+        tbody.$class("ui-widget-content").tr()
+          .td(Times.format(di.getTimestamp())).td(containerId).td(nodeId)
+          .td(queue)._()._()._();
+      }
+      div._();
     }
   }
 

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

@@ -53,7 +53,7 @@ public JAXBContextResolver() throws Exception {
             NodesInfo.class, RemoteExceptionData.class,
             CapacitySchedulerQueueInfoList.class, ResourceInfo.class,
             UsersInfo.class, UserInfo.class, ApplicationStatisticsInfo.class,
-            StatisticsItemInfo.class };
+            StatisticsItemInfo.class, CapacitySchedulerHealthInfo.class };
     // these dao classes need root unwrapping
     final Class[] rootUnwrappedTypes =
         { NewApplication.class, ApplicationSubmissionContextInfo.class,

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

@@ -228,7 +228,7 @@ public SchedulerTypeInfo getSchedulerInfo() {
     if (rs instanceof CapacityScheduler) {
       CapacityScheduler cs = (CapacityScheduler) rs;
       CSQueue root = cs.getRootQueue();
-      sinfo = new CapacitySchedulerInfo(root);
+      sinfo = new CapacitySchedulerInfo(root, cs);
     } else if (rs instanceof FairScheduler) {
       FairScheduler fs = (FairScheduler) rs;
       sinfo = new FairSchedulerInfo(fs);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/dao/CapacitySchedulerHealthInfo.java

@@ -0,0 +1,125 @@
+/**
+ * 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.webapp.dao;
+
+import org.apache.hadoop.yarn.api.records.Resource;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerHealth;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@XmlAccessorType(XmlAccessType.FIELD)
+public class CapacitySchedulerHealthInfo {
+
+  @XmlAccessorType(XmlAccessType.FIELD)
+  public static class OperationInformation {
+    String nodeId;
+    String containerId;
+    String queue;
+
+    OperationInformation() {
+    }
+
+    OperationInformation(SchedulerHealth.DetailedInformation di) {
+      this.nodeId = di.getNodeId() == null ? "N/A" : di.getNodeId().toString();
+      this.containerId =
+          di.getContainerId() == null ? "N/A" : di.getContainerId().toString();
+      this.queue = di.getQueue() == null ? "N/A" : di.getQueue();
+    }
+
+    public String getNodeId() {
+      return nodeId;
+    }
+
+    public String getContainerId() {
+      return containerId;
+    }
+
+    public String getQueue() {
+      return queue;
+    }
+  }
+
+  @XmlAccessorType(XmlAccessType.FIELD)
+  public static class LastRunDetails {
+    String operation;
+    long count;
+    ResourceInfo resources;
+
+    LastRunDetails() {
+    }
+
+    LastRunDetails(String operation, long count, Resource resource) {
+      this.operation = operation;
+      this.count = count;
+      this.resources = new ResourceInfo(resource);
+    }
+
+    public String getOperation() {
+      return operation;
+    }
+
+    public long getCount() {
+      return count;
+    }
+
+    public ResourceInfo getResources() {
+      return resources;
+    }
+  }
+
+  long lastrun;
+  Map<String, OperationInformation> operationsInfo;
+  List<LastRunDetails> lastRunDetails;
+
+  CapacitySchedulerHealthInfo() {
+  }
+
+  public long getLastrun() {
+    return lastrun;
+  }
+
+  CapacitySchedulerHealthInfo(CapacityScheduler cs) {
+    SchedulerHealth ht = cs.getSchedulerHealth();
+    lastrun = ht.getLastSchedulerRunTime();
+    operationsInfo = new HashMap<>();
+    operationsInfo.put("last-allocation",
+      new OperationInformation(ht.getLastAllocationDetails()));
+    operationsInfo.put("last-release",
+      new OperationInformation(ht.getLastReleaseDetails()));
+    operationsInfo.put("last-preemption",
+      new OperationInformation(ht.getLastPreemptionDetails()));
+    operationsInfo.put("last-reservation",
+      new OperationInformation(ht.getLastReservationDetails()));
+
+    lastRunDetails = new ArrayList<>();
+    lastRunDetails.add(new LastRunDetails("releases", ht.getReleaseCount(), ht
+      .getResourcesReleased()));
+    lastRunDetails.add(new LastRunDetails("allocations", ht
+      .getAllocationCount(), ht.getResourcesAllocated()));
+    lastRunDetails.add(new LastRunDetails("reservations", ht
+      .getReservationCount(), ht.getResourcesReserved()));
+
+  }
+}

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/dao/CapacitySchedulerInfo.java

@@ -25,6 +25,7 @@
 import javax.xml.bind.annotation.XmlType;
 
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CSQueue;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.LeafQueue;
 
 @XmlRootElement(name = "capacityScheduler")
@@ -37,6 +38,7 @@ public class CapacitySchedulerInfo extends SchedulerInfo {
   protected float maxCapacity;
   protected String queueName;
   protected CapacitySchedulerQueueInfoList queues;
+  protected CapacitySchedulerHealthInfo health;
 
   @XmlTransient
   static final float EPSILON = 1e-8f;
@@ -44,7 +46,7 @@ public class CapacitySchedulerInfo extends SchedulerInfo {
   public CapacitySchedulerInfo() {
   } // JAXB needs this
 
-  public CapacitySchedulerInfo(CSQueue parent) {
+  public CapacitySchedulerInfo(CSQueue parent, CapacityScheduler cs) {
     this.queueName = parent.getQueueName();
     this.usedCapacity = parent.getUsedCapacity() * 100;
     this.capacity = parent.getCapacity() * 100;
@@ -54,6 +56,7 @@ public CapacitySchedulerInfo(CSQueue parent) {
     this.maxCapacity = max * 100;
 
     queues = getQueues(parent);
+    health = new CapacitySchedulerHealthInfo(cs);
   }
 
   public float getCapacity() {

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

@@ -0,0 +1,351 @@
+/**
+ * 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;
+
+import org.apache.hadoop.net.NetworkTopology;
+import org.apache.hadoop.util.Time;
+import org.apache.hadoop.yarn.api.records.ContainerId;
+import org.apache.hadoop.yarn.api.records.NodeId;
+import org.apache.hadoop.yarn.api.records.Priority;
+import org.apache.hadoop.yarn.api.records.Resource;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
+import org.apache.hadoop.yarn.event.AsyncDispatcher;
+import org.apache.hadoop.yarn.exceptions.YarnException;
+import org.apache.hadoop.yarn.server.resourcemanager.NodeManager;
+import org.apache.hadoop.yarn.server.resourcemanager.Application;
+import org.apache.hadoop.yarn.server.resourcemanager.ResourceManager;
+import org.apache.hadoop.yarn.server.resourcemanager.Task;
+import org.apache.hadoop.yarn.server.resourcemanager.nodelabels.NullRMNodeLabelsManager;
+import org.apache.hadoop.yarn.server.resourcemanager.nodelabels.RMNodeLabelsManager;
+import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNode;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.NodeAddedSchedulerEvent;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.NodeUpdateSchedulerEvent;
+import org.apache.hadoop.yarn.util.resource.Resources;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.io.IOException;
+
+import static org.junit.Assume.assumeTrue;
+
+public class TestSchedulerHealth {
+
+  private ResourceManager resourceManager;
+
+  public void setup() {
+    resourceManager = new ResourceManager() {
+      @Override
+      protected RMNodeLabelsManager createNodeLabelManager() {
+        RMNodeLabelsManager mgr = new NullRMNodeLabelsManager();
+        mgr.init(getConfig());
+        return mgr;
+      }
+    };
+
+    YarnConfiguration conf = new YarnConfiguration();
+    conf.setClass(YarnConfiguration.RM_SCHEDULER, CapacityScheduler.class,
+      ResourceScheduler.class);
+    resourceManager.init(conf);
+    resourceManager.getRMContext().getContainerTokenSecretManager()
+      .rollMasterKey();
+    resourceManager.getRMContext().getNMTokenSecretManager().rollMasterKey();
+    ((AsyncDispatcher) resourceManager.getRMContext().getDispatcher()).start();
+  }
+
+  @Test
+  public void testCounts() {
+
+    SchedulerHealth sh = new SchedulerHealth();
+    int value = 1;
+    for (int i = 0; i < 2; ++i) {
+      sh.updateSchedulerPreemptionCounts(value);
+      sh.updateSchedulerAllocationCounts(value);
+      sh.updateSchedulerReservationCounts(value);
+      sh.updateSchedulerReleaseCounts(value);
+
+      Assert.assertEquals(value, sh.getAllocationCount().longValue());
+      Assert.assertEquals(value, sh.getReleaseCount().longValue());
+      Assert.assertEquals(value, sh.getReservationCount().longValue());
+      Assert.assertEquals(value, sh.getPreemptionCount().longValue());
+
+      Assert.assertEquals(value * (i + 1), sh.getAggregateAllocationCount()
+        .longValue());
+      Assert.assertEquals(value * (i + 1), sh.getAggregateReleaseCount()
+        .longValue());
+      Assert.assertEquals(value * (i + 1), sh.getAggregateReservationCount()
+        .longValue());
+      Assert.assertEquals(value * (i + 1), sh.getAggregatePreemptionCount()
+        .longValue());
+
+    }
+  }
+
+  @Test
+  public void testOperationDetails() {
+
+    SchedulerHealth sh = new SchedulerHealth();
+    long now = Time.now();
+    sh.updateRelease(now, NodeId.newInstance("testhost", 1234),
+      ContainerId.fromString("container_1427562107907_0002_01_000001"),
+      "testqueue");
+    Assert.assertEquals("container_1427562107907_0002_01_000001", sh
+      .getLastReleaseDetails().getContainerId().toString());
+    Assert.assertEquals("testhost:1234", sh.getLastReleaseDetails().getNodeId()
+      .toString());
+    Assert.assertEquals("testqueue", sh.getLastReleaseDetails().getQueue());
+    Assert.assertEquals(now, sh.getLastReleaseDetails().getTimestamp());
+    Assert.assertEquals(0, sh.getLastSchedulerRunTime());
+
+    now = Time.now();
+    sh.updateReservation(now, NodeId.newInstance("testhost1", 1234),
+      ContainerId.fromString("container_1427562107907_0003_01_000001"),
+      "testqueue1");
+    Assert.assertEquals("container_1427562107907_0003_01_000001", sh
+      .getLastReservationDetails().getContainerId().toString());
+    Assert.assertEquals("testhost1:1234", sh.getLastReservationDetails()
+      .getNodeId().toString());
+    Assert
+      .assertEquals("testqueue1", sh.getLastReservationDetails().getQueue());
+    Assert.assertEquals(now, sh.getLastReservationDetails().getTimestamp());
+    Assert.assertEquals(0, sh.getLastSchedulerRunTime());
+
+    now = Time.now();
+    sh.updateAllocation(now, NodeId.newInstance("testhost2", 1234),
+      ContainerId.fromString("container_1427562107907_0004_01_000001"),
+      "testqueue2");
+    Assert.assertEquals("container_1427562107907_0004_01_000001", sh
+      .getLastAllocationDetails().getContainerId().toString());
+    Assert.assertEquals("testhost2:1234", sh.getLastAllocationDetails()
+      .getNodeId().toString());
+    Assert.assertEquals("testqueue2", sh.getLastAllocationDetails().getQueue());
+    Assert.assertEquals(now, sh.getLastAllocationDetails().getTimestamp());
+    Assert.assertEquals(0, sh.getLastSchedulerRunTime());
+
+    now = Time.now();
+    sh.updatePreemption(now, NodeId.newInstance("testhost3", 1234),
+      ContainerId.fromString("container_1427562107907_0005_01_000001"),
+      "testqueue3");
+    Assert.assertEquals("container_1427562107907_0005_01_000001", sh
+      .getLastPreemptionDetails().getContainerId().toString());
+    Assert.assertEquals("testhost3:1234", sh.getLastPreemptionDetails()
+      .getNodeId().toString());
+    Assert.assertEquals("testqueue3", sh.getLastPreemptionDetails().getQueue());
+    Assert.assertEquals(now, sh.getLastPreemptionDetails().getTimestamp());
+    Assert.assertEquals(0, sh.getLastSchedulerRunTime());
+  }
+
+  @Test
+  public void testResourceUpdate() {
+    SchedulerHealth sh = new SchedulerHealth();
+    long now = Time.now();
+    sh.updateSchedulerRunDetails(now, Resource.newInstance(1024, 1),
+      Resource.newInstance(2048, 1));
+    Assert.assertEquals(now, sh.getLastSchedulerRunTime());
+    Assert.assertEquals(Resource.newInstance(1024, 1),
+      sh.getResourcesAllocated());
+    Assert.assertEquals(Resource.newInstance(2048, 1),
+      sh.getResourcesReserved());
+    now = Time.now();
+    sh.updateSchedulerReleaseDetails(now, Resource.newInstance(3072, 1));
+    Assert.assertEquals(now, sh.getLastSchedulerRunTime());
+    Assert.assertEquals(Resource.newInstance(3072, 1),
+      sh.getResourcesReleased());
+  }
+
+  private NodeManager registerNode(String hostName, int containerManagerPort,
+      int httpPort, String rackName, Resource capability) throws IOException,
+      YarnException {
+    NodeManager nm =
+        new NodeManager(hostName, containerManagerPort, httpPort, rackName,
+          capability, resourceManager);
+    NodeAddedSchedulerEvent nodeAddEvent1 =
+        new NodeAddedSchedulerEvent(resourceManager.getRMContext().getRMNodes()
+          .get(nm.getNodeId()));
+    resourceManager.getResourceScheduler().handle(nodeAddEvent1);
+    return nm;
+  }
+
+  private void nodeUpdate(NodeManager nm) {
+    RMNode node =
+        resourceManager.getRMContext().getRMNodes().get(nm.getNodeId());
+    // Send a heartbeat to kick the tires on the Scheduler
+    NodeUpdateSchedulerEvent nodeUpdate = new NodeUpdateSchedulerEvent(node);
+    resourceManager.getResourceScheduler().handle(nodeUpdate);
+  }
+
+  @Test
+  public void testCapacitySchedulerAllocation() throws Exception {
+
+    setup();
+
+    boolean isCapacityScheduler =
+        resourceManager.getResourceScheduler() instanceof CapacityScheduler;
+    assumeTrue("This test is only supported on Capacity Scheduler",
+      isCapacityScheduler);
+
+    // Register node1
+    String host_0 = "host_0";
+    NodeManager nm_0 =
+        registerNode(host_0, 1234, 2345, NetworkTopology.DEFAULT_RACK,
+          Resources.createResource(5 * 1024, 1));
+
+    // ResourceRequest priorities
+    Priority priority_0 =
+        org.apache.hadoop.yarn.server.resourcemanager.resource.Priority
+          .create(0);
+    Priority priority_1 =
+        org.apache.hadoop.yarn.server.resourcemanager.resource.Priority
+          .create(1);
+
+    // Submit an application
+    Application application_0 =
+        new Application("user_0", "default", resourceManager);
+    application_0.submit();
+
+    application_0.addNodeManager(host_0, 1234, nm_0);
+
+    Resource capability_0_0 = Resources.createResource(1024, 1);
+    application_0.addResourceRequestSpec(priority_1, capability_0_0);
+
+    Resource capability_0_1 = Resources.createResource(2 * 1024, 1);
+    application_0.addResourceRequestSpec(priority_0, capability_0_1);
+
+    Task task_0_0 =
+        new Task(application_0, priority_1, new String[] { host_0 });
+    application_0.addTask(task_0_0);
+    Task task_0_1 =
+        new Task(application_0, priority_0, new String[] { host_0 });
+    application_0.addTask(task_0_1);
+
+    // Send resource requests to the scheduler
+    application_0.schedule();
+
+    // Send a heartbeat to kick the tires on the Scheduler
+    nodeUpdate(nm_0);
+    SchedulerHealth sh =
+        ((CapacityScheduler) resourceManager.getResourceScheduler())
+          .getSchedulerHealth();
+    Assert.assertEquals(2, sh.getAllocationCount().longValue());
+    Assert.assertEquals(Resource.newInstance(3 * 1024, 2),
+      sh.getResourcesAllocated());
+    Assert.assertEquals(2, sh.getAggregateAllocationCount().longValue());
+    Assert.assertEquals("host_0:1234", sh.getLastAllocationDetails()
+      .getNodeId().toString());
+    Assert.assertEquals("root.default", sh.getLastAllocationDetails()
+      .getQueue());
+
+    Task task_0_2 =
+        new Task(application_0, priority_0, new String[] { host_0 });
+    application_0.addTask(task_0_2);
+    application_0.schedule();
+
+    nodeUpdate(nm_0);
+    Assert.assertEquals(1, sh.getAllocationCount().longValue());
+    Assert.assertEquals(Resource.newInstance(2 * 1024, 1),
+      sh.getResourcesAllocated());
+    Assert.assertEquals(3, sh.getAggregateAllocationCount().longValue());
+    Assert.assertEquals("host_0:1234", sh.getLastAllocationDetails()
+      .getNodeId().toString());
+    Assert.assertEquals("root.default", sh.getLastAllocationDetails()
+      .getQueue());
+  }
+
+  @Test
+  public void testCapacitySchedulerReservation() throws Exception {
+
+    setup();
+
+    boolean isCapacityScheduler =
+        resourceManager.getResourceScheduler() instanceof CapacityScheduler;
+    assumeTrue("This test is only supported on Capacity Scheduler",
+      isCapacityScheduler);
+
+    // Register nodes
+    String host_0 = "host_0";
+    NodeManager nm_0 =
+        registerNode(host_0, 1234, 2345, NetworkTopology.DEFAULT_RACK,
+          Resources.createResource(2 * 1024, 1));
+    String host_1 = "host_1";
+    NodeManager nm_1 =
+        registerNode(host_1, 1234, 2345, NetworkTopology.DEFAULT_RACK,
+          Resources.createResource(5 * 1024, 1));
+    nodeUpdate(nm_0);
+    nodeUpdate(nm_1);
+
+    // ResourceRequest priorities
+    Priority priority_0 =
+        org.apache.hadoop.yarn.server.resourcemanager.resource.Priority
+          .create(0);
+    Priority priority_1 =
+        org.apache.hadoop.yarn.server.resourcemanager.resource.Priority
+          .create(1);
+
+    // Submit an application
+    Application application_0 =
+        new Application("user_0", "default", resourceManager);
+    application_0.submit();
+
+    application_0.addNodeManager(host_0, 1234, nm_0);
+    application_0.addNodeManager(host_1, 1234, nm_1);
+
+    Resource capability_0_0 = Resources.createResource(1024, 1);
+    application_0.addResourceRequestSpec(priority_1, capability_0_0);
+
+    Resource capability_0_1 = Resources.createResource(2 * 1024, 1);
+    application_0.addResourceRequestSpec(priority_0, capability_0_1);
+
+    Task task_0_0 =
+        new Task(application_0, priority_1, new String[] { host_0 });
+    application_0.addTask(task_0_0);
+
+    // Send resource requests to the scheduler
+    application_0.schedule();
+
+    // Send a heartbeat to kick the tires on the Scheduler
+    nodeUpdate(nm_0);
+    SchedulerHealth sh =
+        ((CapacityScheduler) resourceManager.getResourceScheduler())
+          .getSchedulerHealth();
+    Assert.assertEquals(1, sh.getAllocationCount().longValue());
+    Assert.assertEquals(Resource.newInstance(1024, 1),
+      sh.getResourcesAllocated());
+    Assert.assertEquals(1, sh.getAggregateAllocationCount().longValue());
+    Assert.assertEquals("host_0:1234", sh.getLastAllocationDetails()
+      .getNodeId().toString());
+    Assert.assertEquals("root.default", sh.getLastAllocationDetails()
+      .getQueue());
+
+    Task task_0_1 =
+        new Task(application_0, priority_0, new String[] { host_0 });
+    application_0.addTask(task_0_1);
+    application_0.schedule();
+
+    nodeUpdate(nm_0);
+    Assert.assertEquals(0, sh.getAllocationCount().longValue());
+    Assert.assertEquals(1, sh.getReservationCount().longValue());
+    Assert.assertEquals(Resource.newInstance(2 * 1024, 1),
+      sh.getResourcesReserved());
+    Assert.assertEquals(1, sh.getAggregateAllocationCount().longValue());
+    Assert.assertEquals("host_0:1234", sh.getLastAllocationDetails()
+      .getNodeId().toString());
+    Assert.assertEquals("root.default", sh.getLastAllocationDetails()
+      .getQueue());
+  }
+}

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

@@ -1660,7 +1660,7 @@ public void testMoveAppQueueMetricsCheck() throws Exception {
     CapacityScheduler cs =
         (CapacityScheduler) resourceManager.getResourceScheduler();
     CSQueue origRootQ = cs.getRootQueue();
-    CapacitySchedulerInfo oldInfo = new CapacitySchedulerInfo(origRootQ);
+    CapacitySchedulerInfo oldInfo = new CapacitySchedulerInfo(origRootQ, cs);
     int origNumAppsA = getNumAppsInQueue("a", origRootQ.getChildQueues());
     int origNumAppsRoot = origRootQ.getNumApplications();
 
@@ -1669,7 +1669,7 @@ public void testMoveAppQueueMetricsCheck() throws Exception {
     CSQueue newRootQ = cs.getRootQueue();
     int newNumAppsA = getNumAppsInQueue("a", newRootQ.getChildQueues());
     int newNumAppsRoot = newRootQ.getNumApplications();
-    CapacitySchedulerInfo newInfo = new CapacitySchedulerInfo(newRootQ);
+    CapacitySchedulerInfo newInfo = new CapacitySchedulerInfo(newRootQ, cs);
     CapacitySchedulerLeafQueueInfo origOldA1 =
         (CapacitySchedulerLeafQueueInfo) getQueueInfo("a1", oldInfo.getQueues());
     CapacitySchedulerLeafQueueInfo origNewA1 =

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

@@ -19,6 +19,7 @@
 package org.apache.hadoop.yarn.server.resourcemanager.webapp;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 
 import java.io.StringReader;
@@ -314,11 +315,14 @@ private void verifyClusterScheduler(JSONObject json) throws JSONException,
     JSONObject info = json.getJSONObject("scheduler");
     assertEquals("incorrect number of elements", 1, info.length());
     info = info.getJSONObject("schedulerInfo");
-    assertEquals("incorrect number of elements", 6, info.length());
+    assertEquals("incorrect number of elements", 7, info.length());
     verifyClusterSchedulerGeneric(info.getString("type"),
         (float) info.getDouble("usedCapacity"),
         (float) info.getDouble("capacity"),
         (float) info.getDouble("maxCapacity"), info.getString("queueName"));
+    JSONObject health = info.getJSONObject("health");
+    assertNotNull(health);
+    assertEquals("incorrect number of elements", 3, health.length());
 
     JSONArray arr = info.getJSONObject("queues").getJSONArray("queue");
     assertEquals("incorrect number of elements", 2, arr.length());