YARN-3140. Improve locks in AbstractCSQueue/LeafQueue/ParentQueue. Contributed by Wangda Tan

(cherry picked from commit 2b66d9ec5b)

hadoop-yarn-project/hadoop-yarn/dev-support/findbugs-exclude.xml

@@ -537,4 +537,14 @@
     </Or>
     <Bug pattern="URF_UNREAD_PUBLIC_OR_PROTECTED_FIELD" />
   </Match>
+
+  <!-- Ignore VO_VOLATILE_INCREMENT, they will be protected by writeLock -->
+  <Match>
+    <Class name="org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.LeafQueue$User" />
+    <Or>
+      <Field name="pendingApplications" />
+      <Field name="activeApplications" />
+    </Or>
+    <Bug pattern="VO_VOLATILE_INCREMENT" />
+  </Match>
 </FindBugsFilter>

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

@@ -24,6 +24,7 @@ import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.Set;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
 
 import org.apache.commons.lang.StringUtils;
 import org.apache.commons.logging.Log;
@@ -60,25 +61,25 @@ import com.google.common.collect.Sets;
 
 public abstract class AbstractCSQueue implements CSQueue {
   private static final Log LOG = LogFactory.getLog(AbstractCSQueue.class);  
-  CSQueue parent;
+  volatile CSQueue parent;
   final String queueName;
   volatile int numContainers;
   
   final Resource minimumAllocation;
   volatile Resource maximumAllocation;
-  QueueState state;
+  volatile QueueState state;
   final CSQueueMetrics metrics;
   protected final PrivilegedEntity queueEntity;
 
   final ResourceCalculator resourceCalculator;
   Set<String> accessibleLabels;
-  RMNodeLabelsManager labelManager;
+  final RMNodeLabelsManager labelManager;
   String defaultLabelExpression;
   
   Map<AccessType, AccessControlList> acls = 
       new HashMap<AccessType, AccessControlList>();
   volatile boolean reservationsContinueLooking;
-  private boolean preemptionDisabled;
+  private volatile boolean preemptionDisabled;
 
   // Track resource usage-by-label like used-resource/pending-resource, etc.
   volatile ResourceUsage queueUsage;
@@ -94,6 +95,9 @@ public abstract class AbstractCSQueue implements CSQueue {
 
   protected ActivitiesManager activitiesManager;
 
+  protected ReentrantReadWriteLock.ReadLock readLock;
+  protected ReentrantReadWriteLock.WriteLock writeLock;
+
   public AbstractCSQueue(CapacitySchedulerContext cs,
       String queueName, CSQueue parent, CSQueue old) throws IOException {
     this.labelManager = cs.getRMContext().getNodeLabelManager();
@@ -117,6 +121,10 @@ public abstract class AbstractCSQueue implements CSQueue {
     
     // initialize QueueCapacities
     queueCapacities = new QueueCapacities(parent == null);
+
+    ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
+    readLock = lock.readLock();
+    writeLock = lock.writeLock();
   }
   
   protected void setupConfigurableCapacities() {
@@ -128,12 +136,12 @@ public abstract class AbstractCSQueue implements CSQueue {
   }
   
   @Override
-  public synchronized float getCapacity() {
+  public float getCapacity() {
     return queueCapacities.getCapacity();
   }
 
   @Override
-  public synchronized float getAbsoluteCapacity() {
+  public float getAbsoluteCapacity() {
     return queueCapacities.getAbsoluteCapacity();
   }
 
@@ -167,7 +175,7 @@ public abstract class AbstractCSQueue implements CSQueue {
   }
 
   @Override
-  public synchronized QueueState getState() {
+  public QueueState getState() {
     return state;
   }
   
@@ -187,13 +195,13 @@ public abstract class AbstractCSQueue implements CSQueue {
   }
 
   @Override
-  public synchronized CSQueue getParent() {
+  public CSQueue getParent() {
     return parent;
   }
 
   @Override
-  public synchronized void setParent(CSQueue newParentQueue) {
+  public void setParent(CSQueue newParentQueue) {
-    this.parent = (ParentQueue)newParentQueue;
+    this.parent = newParentQueue;
   }
   
   public Set<String> getAccessibleNodeLabels() {
@@ -221,18 +229,22 @@ public abstract class AbstractCSQueue implements CSQueue {
    * Set maximum capacity - used only for testing.
    * @param maximumCapacity new max capacity
    */
-  synchronized void setMaxCapacity(float maximumCapacity) {
+  void setMaxCapacity(float maximumCapacity) {
-    // Sanity check
+    try {
-    CSQueueUtils.checkMaxCapacity(getQueueName(),
+      writeLock.lock();
-        queueCapacities.getCapacity(), maximumCapacity);
+      // Sanity check
-    float absMaxCapacity =
+      CSQueueUtils.checkMaxCapacity(getQueueName(),
-        CSQueueUtils.computeAbsoluteMaximumCapacity(maximumCapacity, parent);
+          queueCapacities.getCapacity(), maximumCapacity);
-    CSQueueUtils.checkAbsoluteCapacity(getQueueName(),
+      float absMaxCapacity = CSQueueUtils.computeAbsoluteMaximumCapacity(
-        queueCapacities.getAbsoluteCapacity(),
+          maximumCapacity, parent);
-        absMaxCapacity);
+      CSQueueUtils.checkAbsoluteCapacity(getQueueName(),
+          queueCapacities.getAbsoluteCapacity(), absMaxCapacity);
 
-    queueCapacities.setMaximumCapacity(maximumCapacity);
+      queueCapacities.setMaximumCapacity(maximumCapacity);
-    queueCapacities.setAbsoluteMaximumCapacity(absMaxCapacity);
+      queueCapacities.setAbsoluteMaximumCapacity(absMaxCapacity);
+    } finally {
+      writeLock.unlock();
+    }
   }
 
   @Override
@@ -240,70 +252,82 @@ public abstract class AbstractCSQueue implements CSQueue {
     return defaultLabelExpression;
   }
   
-  synchronized void setupQueueConfigs(Resource clusterResource)
+  void setupQueueConfigs(Resource clusterResource)
       throws IOException {
-    // get labels
+    try {
-    this.accessibleLabels =
+      writeLock.lock();
-        csContext.getConfiguration().getAccessibleNodeLabels(getQueuePath());
+      // get labels
-    this.defaultLabelExpression = csContext.getConfiguration()
+      this.accessibleLabels =
-        .getDefaultNodeLabelExpression(getQueuePath());
+          csContext.getConfiguration().getAccessibleNodeLabels(getQueuePath());
+      this.defaultLabelExpression =
+          csContext.getConfiguration().getDefaultNodeLabelExpression(
+              getQueuePath());
 
-    // inherit from parent if labels not set
+      // inherit from parent if labels not set
-    if (this.accessibleLabels == null && parent != null) {
+      if (this.accessibleLabels == null && parent != null) {
-      this.accessibleLabels = parent.getAccessibleNodeLabels();
+        this.accessibleLabels = parent.getAccessibleNodeLabels();
-    }
+      }
 
-    // inherit from parent if labels not set
+      // inherit from parent if labels not set
-    if (this.defaultLabelExpression == null && parent != null
+      if (this.defaultLabelExpression == null && parent != null
-        && this.accessibleLabels.containsAll(parent.getAccessibleNodeLabels())) {
+          && this.accessibleLabels.containsAll(
-      this.defaultLabelExpression = parent.getDefaultNodeLabelExpression();
+          parent.getAccessibleNodeLabels())) {
-    }
+        this.defaultLabelExpression = parent.getDefaultNodeLabelExpression();
+      }
 
-    // After we setup labels, we can setup capacities
+      // After we setup labels, we can setup capacities
-    setupConfigurableCapacities();
+      setupConfigurableCapacities();
 
-    this.maximumAllocation =
+      this.maximumAllocation =
-        csContext.getConfiguration().getMaximumAllocationPerQueue(
+          csContext.getConfiguration().getMaximumAllocationPerQueue(
-            getQueuePath());
+              getQueuePath());
 
-    authorizer = YarnAuthorizationProvider.getInstance(csContext.getConf());
+      authorizer = YarnAuthorizationProvider.getInstance(csContext.getConf());
 
-    this.state = csContext.getConfiguration().getState(getQueuePath());
+      this.state = csContext.getConfiguration().getState(getQueuePath());
-    this.acls = csContext.getConfiguration().getAcls(getQueuePath());
+      this.acls = csContext.getConfiguration().getAcls(getQueuePath());
 
-    // Update metrics
+      // Update metrics
-    CSQueueUtils.updateQueueStatistics(resourceCalculator, clusterResource,
+      CSQueueUtils.updateQueueStatistics(resourceCalculator, clusterResource,
-        minimumAllocation, this, labelManager, null);
+          minimumAllocation, this, labelManager, null);
 
-    // Check if labels of this queue is a subset of parent queue, only do this
+      // Check if labels of this queue is a subset of parent queue, only do this
-    // when we not root
+      // when we not root
-    if (parent != null && parent.getParent() != null) {
+      if (parent != null && parent.getParent() != null) {
-      if (parent.getAccessibleNodeLabels() != null
+        if (parent.getAccessibleNodeLabels() != null && !parent
-          && !parent.getAccessibleNodeLabels().contains(RMNodeLabelsManager.ANY)) {
+            .getAccessibleNodeLabels().contains(RMNodeLabelsManager.ANY)) {
-        // if parent isn't "*", child shouldn't be "*" too
+          // if parent isn't "*", child shouldn't be "*" too
-        if (this.getAccessibleNodeLabels().contains(RMNodeLabelsManager.ANY)) {
+          if (this.getAccessibleNodeLabels().contains(
-          throw new IOException("Parent's accessible queue is not ANY(*), "
+              RMNodeLabelsManager.ANY)) {
-              + "but child's accessible queue is *");
+            throw new IOException("Parent's accessible queue is not ANY(*), "
-        } else {
+                + "but child's accessible queue is *");
-          Set<String> diff =
+          } else{
-              Sets.difference(this.getAccessibleNodeLabels(),
+            Set<String> diff = Sets.difference(this.getAccessibleNodeLabels(),
-                  parent.getAccessibleNodeLabels());
+                parent.getAccessibleNodeLabels());
-          if (!diff.isEmpty()) {
+            if (!diff.isEmpty()) {
-            throw new IOException("Some labels of child queue is not a subset "
+              throw new IOException(
-                + "of parent queue, these labels=["
+                  "Some labels of child queue is not a subset "
-                + StringUtils.join(diff, ",") + "]");
+                      + "of parent queue, these labels=[" + StringUtils
+                      .join(diff, ",") + "]");
+            }
           }
         }
       }
+
+      this.reservationsContinueLooking =
+          csContext.getConfiguration().getReservationContinueLook();
+
+      this.preemptionDisabled = isQueueHierarchyPreemptionDisabled(this);
+    } finally {
+      writeLock.unlock();
     }
-
-    this.reservationsContinueLooking = csContext.getConfiguration()
-        .getReservationContinueLook();
-
-    this.preemptionDisabled = isQueueHierarchyPreemptionDisabled(this);
   }
 
   protected QueueInfo getQueueInfo() {
+    // Deliberately doesn't use lock here, because this method will be invoked
+    // from schedulerApplicationAttempt, to avoid deadlock, sacrifice
+    // consistency here.
+    // TODO, improve this
     QueueInfo queueInfo = recordFactory.newRecordInstance(QueueInfo.class);
     queueInfo.setQueueName(queueName);
     queueInfo.setAccessibleNodeLabels(accessibleLabels);
@@ -318,8 +342,12 @@ public abstract class AbstractCSQueue implements CSQueue {
   }
 
   public QueueStatistics getQueueStatistics() {
-    QueueStatistics stats =
+    // Deliberately doesn't use lock here, because this method will be invoked
-        recordFactory.newRecordInstance(QueueStatistics.class);
+    // from schedulerApplicationAttempt, to avoid deadlock, sacrifice
+    // consistency here.
+    // TODO, improve this
+    QueueStatistics stats = recordFactory.newRecordInstance(
+        QueueStatistics.class);
     stats.setNumAppsSubmitted(getMetrics().getAppsSubmitted());
     stats.setNumAppsRunning(getMetrics().getAppsRunning());
     stats.setNumAppsPending(getMetrics().getAppsPending());
@@ -351,26 +379,36 @@ public abstract class AbstractCSQueue implements CSQueue {
     return minimumAllocation;
   }
   
-  synchronized void allocateResource(Resource clusterResource,
+  void allocateResource(Resource clusterResource,
       Resource resource, String nodePartition, boolean changeContainerResource) {
-    queueUsage.incUsed(nodePartition, resource);
+    try {
+      writeLock.lock();
+      queueUsage.incUsed(nodePartition, resource);
 
-    if (!changeContainerResource) {
+      if (!changeContainerResource) {
-      ++numContainers;
+        ++numContainers;
+      }
+      CSQueueUtils.updateQueueStatistics(resourceCalculator, clusterResource,
+          minimumAllocation, this, labelManager, nodePartition);
+    } finally {
+      writeLock.unlock();
     }
-    CSQueueUtils.updateQueueStatistics(resourceCalculator, clusterResource,
-        minimumAllocation, this, labelManager, nodePartition);
   }
   
-  protected synchronized void releaseResource(Resource clusterResource,
+  protected void releaseResource(Resource clusterResource,
       Resource resource, String nodePartition, boolean changeContainerResource) {
-    queueUsage.decUsed(nodePartition, resource);
+    try {
+      writeLock.lock();
+      queueUsage.decUsed(nodePartition, resource);
 
-    CSQueueUtils.updateQueueStatistics(resourceCalculator, clusterResource,
+      CSQueueUtils.updateQueueStatistics(resourceCalculator, clusterResource,
-        minimumAllocation, this, labelManager, nodePartition);
+          minimumAllocation, this, labelManager, nodePartition);
 
-    if (!changeContainerResource) {
+      if (!changeContainerResource) {
-      --numContainers;
+        --numContainers;
+      }
+    } finally {
+      writeLock.unlock();
     }
   }
   
@@ -381,7 +419,13 @@ public abstract class AbstractCSQueue implements CSQueue {
   
   @Private
   public Map<AccessType, AccessControlList> getACLs() {
-    return acls;
+    try {
+      readLock.lock();
+      return acls;
+    } finally {
+      readLock.unlock();
+    }
+
   }
 
   @Private
@@ -464,86 +508,88 @@ public abstract class AbstractCSQueue implements CSQueue {
         minimumAllocation);
   }
 
-  synchronized boolean canAssignToThisQueue(Resource clusterResource,
+  boolean canAssignToThisQueue(Resource clusterResource,
       String nodePartition, ResourceLimits currentResourceLimits,
       Resource resourceCouldBeUnreserved, SchedulingMode schedulingMode) {
-    // Get current limited resource: 
+    try {
-    // - When doing RESPECT_PARTITION_EXCLUSIVITY allocation, we will respect
+      readLock.lock();
-    // queues' max capacity.
+      // Get current limited resource:
-    // - When doing IGNORE_PARTITION_EXCLUSIVITY allocation, we will not respect
+      // - When doing RESPECT_PARTITION_EXCLUSIVITY allocation, we will respect
-    // queue's max capacity, queue's max capacity on the partition will be
+      // queues' max capacity.
-    // considered to be 100%. Which is a queue can use all resource in the
+      // - When doing IGNORE_PARTITION_EXCLUSIVITY allocation, we will not respect
-    // partition. 
+      // queue's max capacity, queue's max capacity on the partition will be
-    // Doing this because: for non-exclusive allocation, we make sure there's
+      // considered to be 100%. Which is a queue can use all resource in the
-    // idle resource on the partition, to avoid wastage, such resource will be
+      // partition.
-    // leveraged as much as we can, and preemption policy will reclaim it back
+      // Doing this because: for non-exclusive allocation, we make sure there's
-    // when partitoned-resource-request comes back.  
+      // idle resource on the partition, to avoid wastage, such resource will be
-    Resource currentLimitResource =
+      // leveraged as much as we can, and preemption policy will reclaim it back
-        getCurrentLimitResource(nodePartition, clusterResource,
+      // when partitoned-resource-request comes back.
-            currentResourceLimits, schedulingMode);
+      Resource currentLimitResource = getCurrentLimitResource(nodePartition,
+          clusterResource, currentResourceLimits, schedulingMode);
 
-    Resource nowTotalUsed = queueUsage.getUsed(nodePartition);
+      Resource nowTotalUsed = queueUsage.getUsed(nodePartition);
 
-    // Set headroom for currentResourceLimits:
+      // Set headroom for currentResourceLimits:
-    // When queue is a parent queue: Headroom = limit - used + killable
+      // When queue is a parent queue: Headroom = limit - used + killable
-    // When queue is a leaf queue: Headroom = limit - used (leaf queue cannot preempt itself)
+      // When queue is a leaf queue: Headroom = limit - used (leaf queue cannot preempt itself)
-    Resource usedExceptKillable = nowTotalUsed;
+      Resource usedExceptKillable = nowTotalUsed;
-    if (null != getChildQueues() && !getChildQueues().isEmpty()) {
+      if (null != getChildQueues() && !getChildQueues().isEmpty()) {
-      usedExceptKillable = Resources.subtract(nowTotalUsed,
+        usedExceptKillable = Resources.subtract(nowTotalUsed,
-          getTotalKillableResource(nodePartition));
+            getTotalKillableResource(nodePartition));
-    }
+      }
-    currentResourceLimits.setHeadroom(
+      currentResourceLimits.setHeadroom(
-        Resources.subtract(currentLimitResource, usedExceptKillable));
+          Resources.subtract(currentLimitResource, usedExceptKillable));
 
-    if (Resources.greaterThanOrEqual(resourceCalculator, clusterResource,
+      if (Resources.greaterThanOrEqual(resourceCalculator, clusterResource,
-        usedExceptKillable, currentLimitResource)) {
+          usedExceptKillable, currentLimitResource)) {
 
-      // if reservation continous looking enabled, check to see if could we
+        // if reservation continous looking enabled, check to see if could we
-      // potentially use this node instead of a reserved node if the application
+        // potentially use this node instead of a reserved node if the application
-      // has reserved containers.
+        // has reserved containers.
-      // TODO, now only consider reservation cases when the node has no label
+        // TODO, now only consider reservation cases when the node has no label
-      if (this.reservationsContinueLooking
+        if (this.reservationsContinueLooking && nodePartition.equals(
-          && nodePartition.equals(RMNodeLabelsManager.NO_LABEL)
+            RMNodeLabelsManager.NO_LABEL) && Resources.greaterThan(
-          && Resources.greaterThan(resourceCalculator, clusterResource,
+            resourceCalculator, clusterResource, resourceCouldBeUnreserved,
-              resourceCouldBeUnreserved, Resources.none())) {
+            Resources.none())) {
-        // resource-without-reserved = used - reserved
+          // resource-without-reserved = used - reserved
-        Resource newTotalWithoutReservedResource =
+          Resource newTotalWithoutReservedResource = Resources.subtract(
-            Resources.subtract(usedExceptKillable, resourceCouldBeUnreserved);
+              usedExceptKillable, resourceCouldBeUnreserved);
 
-        // when total-used-without-reserved-resource < currentLimit, we still
+          // when total-used-without-reserved-resource < currentLimit, we still
-        // have chance to allocate on this node by unreserving some containers
+          // have chance to allocate on this node by unreserving some containers
-        if (Resources.lessThan(resourceCalculator, clusterResource,
+          if (Resources.lessThan(resourceCalculator, clusterResource,
-            newTotalWithoutReservedResource, currentLimitResource)) {
+              newTotalWithoutReservedResource, currentLimitResource)) {
-          if (LOG.isDebugEnabled()) {
+            if (LOG.isDebugEnabled()) {
-            LOG.debug("try to use reserved: " + getQueueName()
+              LOG.debug(
-                + " usedResources: " + queueUsage.getUsed()
+                  "try to use reserved: " + getQueueName() + " usedResources: "
-                + ", clusterResources: " + clusterResource
+                      + queueUsage.getUsed() + ", clusterResources: "
-                + ", reservedResources: " + resourceCouldBeUnreserved
+                      + clusterResource + ", reservedResources: "
-                + ", capacity-without-reserved: "
+                      + resourceCouldBeUnreserved
-                + newTotalWithoutReservedResource + ", maxLimitCapacity: "
+                      + ", capacity-without-reserved: "
-                + currentLimitResource);
+                      + newTotalWithoutReservedResource + ", maxLimitCapacity: "
+                      + currentLimitResource);
+            }
+            return true;
           }
-          return true;
         }
+        if (LOG.isDebugEnabled()) {
+          LOG.debug(getQueueName() + "Check assign to queue, nodePartition="
+              + nodePartition + " usedResources: " + queueUsage
+              .getUsed(nodePartition) + " clusterResources: " + clusterResource
+              + " currentUsedCapacity " + Resources
+              .divide(resourceCalculator, clusterResource,
+                  queueUsage.getUsed(nodePartition), labelManager
+                      .getResourceByLabel(nodePartition, clusterResource))
+              + " max-capacity: " + queueCapacities
+              .getAbsoluteMaximumCapacity(nodePartition) + ")");
+        }
+        return false;
       }
-      if (LOG.isDebugEnabled()) {
+      return true;
-        LOG.debug(getQueueName()
+    } finally {
-            + "Check assign to queue, nodePartition="
+      readLock.unlock();
-            + nodePartition
-            + " usedResources: "
-            + queueUsage.getUsed(nodePartition)
-            + " clusterResources: "
-            + clusterResource
-            + " currentUsedCapacity "
-            + Resources.divide(resourceCalculator, clusterResource,
-                queueUsage.getUsed(nodePartition),
-                labelManager.getResourceByLabel(nodePartition, clusterResource))
-            + " max-capacity: "
-            + queueCapacities.getAbsoluteMaximumCapacity(nodePartition) + ")");
-      }
-      return false;
     }
-    return true;
+
   }
 
   @Override

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

@@ -79,76 +79,98 @@ public class PlanQueue extends ParentQueue {
   }
 
   @Override
-  public synchronized void reinitialize(CSQueue newlyParsedQueue,
+  public void reinitialize(CSQueue newlyParsedQueue,
       Resource clusterResource) throws IOException {
-    // Sanity check
+    try {
-    if (!(newlyParsedQueue instanceof PlanQueue)
+      writeLock.lock();
-        || !newlyParsedQueue.getQueuePath().equals(getQueuePath())) {
+      // Sanity check
-      throw new IOException("Trying to reinitialize " + getQueuePath()
+      if (!(newlyParsedQueue instanceof PlanQueue) || !newlyParsedQueue
-          + " from " + newlyParsedQueue.getQueuePath());
+          .getQueuePath().equals(getQueuePath())) {
-    }
+        throw new IOException(
+            "Trying to reinitialize " + getQueuePath() + " from "
+                + newlyParsedQueue.getQueuePath());
+      }
 
-    PlanQueue newlyParsedParentQueue = (PlanQueue) newlyParsedQueue;
+      PlanQueue newlyParsedParentQueue = (PlanQueue) newlyParsedQueue;
 
-    if (newlyParsedParentQueue.getChildQueues().size() > 0) {
+      if (newlyParsedParentQueue.getChildQueues().size() > 0) {
-      throw new IOException(
+        throw new IOException(
-          "Reservable Queue should not have sub-queues in the"
+            "Reservable Queue should not have sub-queues in the"
-              + "configuration");
+                + "configuration");
-    }
+      }
 
-    // Set new configs
+      // Set new configs
-    setupQueueConfigs(clusterResource);
+      setupQueueConfigs(clusterResource);
 
-    updateQuotas(newlyParsedParentQueue.userLimit,
+      updateQuotas(newlyParsedParentQueue.userLimit,
-        newlyParsedParentQueue.userLimitFactor,
+          newlyParsedParentQueue.userLimitFactor,
-        newlyParsedParentQueue.maxAppsForReservation,
+          newlyParsedParentQueue.maxAppsForReservation,
-        newlyParsedParentQueue.maxAppsPerUserForReservation);
+          newlyParsedParentQueue.maxAppsPerUserForReservation);
 
-    // run reinitialize on each existing queue, to trigger absolute cap
+      // run reinitialize on each existing queue, to trigger absolute cap
-    // recomputations
+      // recomputations
-    for (CSQueue res : this.getChildQueues()) {
+      for (CSQueue res : this.getChildQueues()) {
-      res.reinitialize(res, clusterResource);
+        res.reinitialize(res, clusterResource);
-    }
+      }
-    showReservationsAsQueues = newlyParsedParentQueue.showReservationsAsQueues;
+      showReservationsAsQueues =
-  }
+          newlyParsedParentQueue.showReservationsAsQueues;
-
+    } finally {
-  synchronized void addChildQueue(CSQueue newQueue)
+      writeLock.unlock();
-      throws SchedulerDynamicEditException {
-    if (newQueue.getCapacity() > 0) {
-      throw new SchedulerDynamicEditException("Queue " + newQueue
-          + " being added has non zero capacity.");
-    }
-    boolean added = this.childQueues.add(newQueue);
-    if (LOG.isDebugEnabled()) {
-      LOG.debug("updateChildQueues (action: add queue): " + added + " "
-          + getChildQueuesToPrint());
     }
   }
 
-  synchronized void removeChildQueue(CSQueue remQueue)
+  void addChildQueue(CSQueue newQueue)
       throws SchedulerDynamicEditException {
-    if (remQueue.getCapacity() > 0) {
+    try {
-      throw new SchedulerDynamicEditException("Queue " + remQueue
+      writeLock.lock();
-          + " being removed has non zero capacity.");
+      if (newQueue.getCapacity() > 0) {
+        throw new SchedulerDynamicEditException(
+            "Queue " + newQueue + " being added has non zero capacity.");
+      }
+      boolean added = this.childQueues.add(newQueue);
+      if (LOG.isDebugEnabled()) {
+        LOG.debug("updateChildQueues (action: add queue): " + added + " "
+            + getChildQueuesToPrint());
+      }
+    } finally {
+      writeLock.unlock();
     }
-    Iterator<CSQueue> qiter = childQueues.iterator();
+  }
-    while (qiter.hasNext()) {
+
-      CSQueue cs = qiter.next();
+  void removeChildQueue(CSQueue remQueue)
-      if (cs.equals(remQueue)) {
+      throws SchedulerDynamicEditException {
-        qiter.remove();
+    try {
-        if (LOG.isDebugEnabled()) {
+      writeLock.lock();
-          LOG.debug("Removed child queue: {}", cs.getQueueName());
+      if (remQueue.getCapacity() > 0) {
+        throw new SchedulerDynamicEditException(
+            "Queue " + remQueue + " being removed has non zero capacity.");
+      }
+      Iterator<CSQueue> qiter = childQueues.iterator();
+      while (qiter.hasNext()) {
+        CSQueue cs = qiter.next();
+        if (cs.equals(remQueue)) {
+          qiter.remove();
+          if (LOG.isDebugEnabled()) {
+            LOG.debug("Removed child queue: {}", cs.getQueueName());
+          }
         }
       }
+    } finally {
+      writeLock.unlock();
     }
   }
 
-  protected synchronized float sumOfChildCapacities() {
+  protected float sumOfChildCapacities() {
-    float ret = 0;
+    try {
-    for (CSQueue l : childQueues) {
+      writeLock.lock();
-      ret += l.getCapacity();
+      float ret = 0;
+      for (CSQueue l : childQueues) {
+        ret += l.getCapacity();
+      }
+      return ret;
+    } finally {
+      writeLock.unlock();
     }
-    return ret;
   }
 
   private void updateQuotas(int userLimit, float userLimitFactor,

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

@@ -51,22 +51,28 @@ public class ReservationQueue extends LeafQueue {
   }
 
   @Override
-  public synchronized void reinitialize(CSQueue newlyParsedQueue,
+  public void reinitialize(CSQueue newlyParsedQueue,
       Resource clusterResource) throws IOException {
-    // Sanity check
+    try {
-    if (!(newlyParsedQueue instanceof ReservationQueue)
+      writeLock.lock();
-        || !newlyParsedQueue.getQueuePath().equals(getQueuePath())) {
+      // Sanity check
-      throw new IOException("Trying to reinitialize " + getQueuePath()
+      if (!(newlyParsedQueue instanceof ReservationQueue) || !newlyParsedQueue
-          + " from " + newlyParsedQueue.getQueuePath());
+          .getQueuePath().equals(getQueuePath())) {
-    }
+        throw new IOException(
-    super.reinitialize(newlyParsedQueue, clusterResource);
+            "Trying to reinitialize " + getQueuePath() + " from "
-    CSQueueUtils.updateQueueStatistics(resourceCalculator, clusterResource,
+                + newlyParsedQueue.getQueuePath());
-        minimumAllocation, this, labelManager, null);
+      }
+      super.reinitialize(newlyParsedQueue, clusterResource);
+      CSQueueUtils.updateQueueStatistics(resourceCalculator, clusterResource,
+          minimumAllocation, this, labelManager, null);
 
-    updateQuotas(parent.getUserLimitForReservation(),
+      updateQuotas(parent.getUserLimitForReservation(),
-        parent.getUserLimitFactor(),
+          parent.getUserLimitFactor(),
-        parent.getMaxApplicationsForReservations(),
+          parent.getMaxApplicationsForReservations(),
-        parent.getMaxApplicationsPerUserForReservation());
+          parent.getMaxApplicationsPerUserForReservation());
+    } finally {
+      writeLock.unlock();
+    }
   }
 
   /**
@@ -77,21 +83,26 @@ public class ReservationQueue extends LeafQueue {
    *          maxCapacity, etc..)
    * @throws SchedulerDynamicEditException
    */
-  public synchronized void setEntitlement(QueueEntitlement entitlement)
+  public void setEntitlement(QueueEntitlement entitlement)
       throws SchedulerDynamicEditException {
-    float capacity = entitlement.getCapacity();
+    try {
-    if (capacity < 0 || capacity > 1.0f) {
+      writeLock.lock();
-      throw new SchedulerDynamicEditException(
+      float capacity = entitlement.getCapacity();
-          "Capacity demand is not in the [0,1] range: " + capacity);
+      if (capacity < 0 || capacity > 1.0f) {
-    }
+        throw new SchedulerDynamicEditException(
-    setCapacity(capacity);
+            "Capacity demand is not in the [0,1] range: " + capacity);
-    setAbsoluteCapacity(getParent().getAbsoluteCapacity() * getCapacity());
+      }
-    // note: we currently set maxCapacity to capacity
+      setCapacity(capacity);
-    // this might be revised later
+      setAbsoluteCapacity(getParent().getAbsoluteCapacity() * getCapacity());
-    setMaxCapacity(entitlement.getMaxCapacity());
+      // note: we currently set maxCapacity to capacity
-    if (LOG.isDebugEnabled()) {
+      // this might be revised later
-      LOG.debug("successfully changed to " + capacity + " for queue "
+      setMaxCapacity(entitlement.getMaxCapacity());
-          + this.getQueueName());
+      if (LOG.isDebugEnabled()) {
+        LOG.debug("successfully changed to " + capacity + " for queue " + this
+            .getQueueName());
+      }
+    } finally {
+      writeLock.unlock();
     }
   }
 

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

@@ -828,8 +828,8 @@ public class TestContainerResizing {
         app.getAppAttemptResourceUsage().getPending().getMemorySize());
     // Queue/user/application's usage will be updated
     checkUsedResource(rm1, "default", 0 * GB, null);
-    Assert.assertEquals(0 * GB, ((LeafQueue) cs.getQueue("default"))
+    // User will be removed
-        .getUser("user").getUsed().getMemorySize());
+    Assert.assertNull(((LeafQueue) cs.getQueue("default")).getUser("user"));
     Assert.assertEquals(0 * GB,
         app.getAppAttemptResourceUsage().getReserved().getMemorySize());
     Assert.assertEquals(0 * GB,