YARN-4624. NPE in PartitionQueueCapacitiesInfo while accessing Schduler UI. Contributed by Brahma Reddy Battula

(cherry picked from commit d81b8163b4e5c0466a6af6e1068f512c5fd24a61)
(cherry picked from commit 991823482f6687be681be69931e8a4646bc68a69)

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

@@ -35,14 +35,14 @@ public class PartitionQueueCapacitiesInfo {
   private float absoluteCapacity;
   private float absoluteUsedCapacity;
   private float absoluteMaxCapacity  = 100;
-  private Float maxAMLimitPercentage;
+  private float maxAMLimitPercentage;
 
   public PartitionQueueCapacitiesInfo() {
   }
 
   public PartitionQueueCapacitiesInfo(String partitionName, float capacity,
       float usedCapacity, float maxCapacity, float absCapacity,
-      float absUsedCapacity, float absMaxCapacity, Float maxAMLimitPercentage) {
+      float absUsedCapacity, float absMaxCapacity, float maxAMLimitPercentage) {
     super();
     this.partitionName = partitionName;
     this.capacity = capacity;

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

@@ -49,7 +49,7 @@ public class QueueCapacitiesInfo {
     float absCapacity;
     float absUsedCapacity;
     float absMaxCapacity;
-    Float maxAMLimitPercentage;
+    float maxAMLimitPercentage;
     for (String partitionName : capacities.getExistingNodeLabels()) {
       usedCapacity = capacities.getUsedCapacity(partitionName) * 100;
       capacity = capacities.getCapacity(partitionName) * 100;
@@ -68,7 +68,7 @@ public class QueueCapacitiesInfo {
       queueCapacitiesByPartition.add(new PartitionQueueCapacitiesInfo(
           partitionName, capacity, usedCapacity, maxCapacity, absCapacity,
           absUsedCapacity, absMaxCapacity,
-          considerAMUsage ? maxAMLimitPercentage : null));
+          considerAMUsage ? maxAMLimitPercentage : 0f));
     }
   }