YARN-2978. Fixed potential NPE while getting queue info. Contributed by Varun Saxena

(cherry picked from commit dd57c2047bfd21910acc38c98153eedf1db75169)

hadoop-yarn-project/CHANGES.txt

@@ -287,6 +287,9 @@ Release 2.7.0 - UNRELEASED
     YARN-2958. Made RMStateStore not update the last sequence number when updating the
     delegation token. (Varun Saxena via zjshen)
 
+    YARN-2978. Fixed potential NPE while getting queue info. (Varun Saxena via
+    jianhe)
+
 Release 2.6.0 - 2014-11-18
 
   INCOMPATIBLE CHANGES

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

@@ -65,7 +65,6 @@ public abstract class AbstractCSQueue implements CSQueue {
   RMNodeLabelsManager labelManager;
   String defaultLabelExpression;
   Resource usedResources = Resources.createResource(0, 0);
-  QueueInfo queueInfo;
   Map<String, Float> absoluteCapacityByNodeLabels;
   Map<String, Float> capacitiyByNodeLabels;
   Map<String, Resource> usedResourcesByNodeLabels = new HashMap<String, Resource>();
@@ -87,7 +86,6 @@ public abstract class AbstractCSQueue implements CSQueue {
     this.parent = parent;
     this.queueName = queueName;
     this.resourceCalculator = cs.getResourceCalculator();
-    this.queueInfo = recordFactory.newRecordInstance(QueueInfo.class);
     
     // must be called after parent and queueName is set
     this.metrics = old != null ? old.getMetrics() :
@@ -99,9 +97,7 @@ public abstract class AbstractCSQueue implements CSQueue {
     this.accessibleLabels = cs.getConfiguration().getAccessibleNodeLabels(getQueuePath());
     this.defaultLabelExpression = cs.getConfiguration()
         .getDefaultNodeLabelExpression(getQueuePath());
-    
-    this.queueInfo.setQueueName(queueName);
-    
+
     // inherit from parent if labels not set
     if (this.accessibleLabels == null && parent != null) {
       this.accessibleLabels = parent.getAccessibleNodeLabels();
@@ -280,12 +276,6 @@ public abstract class AbstractCSQueue implements CSQueue {
     this.capacitiyByNodeLabels = new HashMap<String, Float>(nodeLabelCapacities);
     this.maxCapacityByNodeLabels =
         new HashMap<String, Float>(maximumNodeLabelCapacities);
-    
-    this.queueInfo.setAccessibleNodeLabels(this.accessibleLabels);
-    this.queueInfo.setCapacity(this.capacity);
-    this.queueInfo.setMaximumCapacity(this.maximumCapacity);
-    this.queueInfo.setQueueState(this.state);
-    this.queueInfo.setDefaultNodeLabelExpression(this.defaultLabelExpression);
 
     // Update metrics
     CSQueueUtils.updateQueueStatistics(
@@ -330,6 +320,18 @@ public abstract class AbstractCSQueue implements CSQueue {
     this.reservationsContinueLooking = reservationContinueLooking;
   }
   
+  protected QueueInfo getQueueInfo() {
+    QueueInfo queueInfo = recordFactory.newRecordInstance(QueueInfo.class);
+    queueInfo.setQueueName(queueName);
+    queueInfo.setAccessibleNodeLabels(accessibleLabels);
+    queueInfo.setCapacity(capacity);
+    queueInfo.setMaximumCapacity(maximumCapacity);
+    queueInfo.setQueueState(state);
+    queueInfo.setDefaultNodeLabelExpression(defaultLabelExpression);
+    queueInfo.setCurrentCapacity(getUsedCapacity());
+    return queueInfo;
+  }
+  
   @Private
   public Resource getMaximumAllocation() {
     return maximumAllocation;

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

@@ -163,8 +163,6 @@ public class LeafQueue extends AbstractCSQueue {
         CSQueueUtils.computeMaxActiveApplicationsPerUser(
             maxActiveAppsUsingAbsCap, userLimit, userLimitFactor);
 
-    this.queueInfo.setChildQueues(new ArrayList<QueueInfo>());
-
     QueueState state = cs.getConfiguration().getState(getQueuePath());
 
     Map<QueueACL, AccessControlList> acls = 
@@ -235,14 +233,14 @@ public class LeafQueue extends AbstractCSQueue {
         this.defaultLabelExpression)) {
       throw new IOException("Invalid default label expression of "
           + " queue="
-          + queueInfo.getQueueName()
+          + getQueueName()
           + " doesn't have permission to access all labels "
           + "in default label expression. labelExpression of resource request="
           + (this.defaultLabelExpression == null ? ""
               : this.defaultLabelExpression)
           + ". Queue labels="
-          + (queueInfo.getAccessibleNodeLabels() == null ? "" : StringUtils.join(queueInfo
-              .getAccessibleNodeLabels().iterator(), ',')));
+          + (getAccessibleNodeLabels() == null ? "" : StringUtils.join(
+              getAccessibleNodeLabels().iterator(), ',')));
     }
     
     this.nodeLocalityDelay = nodeLocalityDelay;
@@ -433,7 +431,7 @@ public class LeafQueue extends AbstractCSQueue {
   @Override
   public synchronized QueueInfo getQueueInfo(
       boolean includeChildQueues, boolean recursive) {
-    queueInfo.setCurrentCapacity(usedCapacity);
+    QueueInfo queueInfo = getQueueInfo();
     return queueInfo;
   }
 

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

@@ -110,8 +110,6 @@ public class ParentQueue extends AbstractCSQueue {
     Map<QueueACL, AccessControlList> acls = 
       cs.getConfiguration().getAcls(getQueuePath());
 
-    this.queueInfo.setChildQueues(new ArrayList<QueueInfo>());
-
     setupQueueConfigs(cs.getClusterResource(), capacity, absoluteCapacity,
         maximumCapacity, absoluteMaxCapacity, state, acls, accessibleLabels,
         defaultLabelExpression, capacitiyByNodeLabels, maxCapacityByNodeLabels, 
@@ -206,7 +204,7 @@ public class ParentQueue extends AbstractCSQueue {
   @Override
   public synchronized QueueInfo getQueueInfo( 
       boolean includeChildQueues, boolean recursive) {
-    queueInfo.setCurrentCapacity(usedCapacity);
+    QueueInfo queueInfo = getQueueInfo();
 
     List<QueueInfo> childQueuesInfo = new ArrayList<QueueInfo>();
     if (includeChildQueues) {