diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/AllocationFileLoaderService.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/AllocationFileLoaderService.java
index bf5b4c5602..313a27ae37 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/AllocationFileLoaderService.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/AllocationFileLoaderService.java
@@ -266,7 +266,7 @@ public synchronized void reloadAllocations() throws IOException,
     Map<FSQueueType, Set<String>> configuredQueues = new HashMap<>();
 
     for (FSQueueType queueType : FSQueueType.values()) {
-      configuredQueues.put(queueType, new HashSet<String>());
+      configuredQueues.put(queueType, new HashSet<>());
     }
 
     // Read and parse the allocations file.
@@ -280,7 +280,7 @@ public synchronized void reloadAllocations() throws IOException,
       throw new AllocationConfigurationException("Bad fair scheduler config " +
           "file: top-level element not <allocations>");
     NodeList elements = root.getChildNodes();
-    List<Element> queueElements = new ArrayList<Element>();
+    List<Element> queueElements = new ArrayList<>();
     Element placementPolicyElement = null;
     for (int i = 0; i < elements.getLength(); i++) {
       Node node = elements.item(i);