YARN-10615. Fix Auto Queue Creation hierarchy construction to use queue path instead of short queue name. Contributed by Andras Gyori

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

@@ -55,13 +55,15 @@ public class CapacitySchedulerAutoQueueHandler {
     List<ApplicationPlacementContext> parentsToCreate = new ArrayList<>();
 
     ApplicationPlacementContext queueCandidateContext = parentContext;
-    CSQueue existingQueueCandidate = getQueue(queueCandidateContext.getQueue());
+    CSQueue existingQueueCandidate = getQueue(
+        queueCandidateContext.getFullQueuePath());
 
     while (existingQueueCandidate == null) {
       parentsToCreate.add(queueCandidateContext);
       queueCandidateContext = CSQueueUtils.extractQueuePath(
           queueCandidateContext.getParentQueue());
-      existingQueueCandidate = getQueue(queueCandidateContext.getQueue());
+      existingQueueCandidate = getQueue(
+          queueCandidateContext.getFullQueuePath());
     }
 
     // Reverse the collection to to represent the hierarchy to be created

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

@@ -525,6 +525,25 @@ public class TestCapacitySchedulerNewQueueAutoCreation
             user0LeafQueue.getMinimumAllocation()).getMemorySize(), 1e-6);
   }
 
+  @Test
+  public void testAutoCreateQueueIfAmbiguousQueueNames() throws Exception {
+    startScheduler();
+
+    AbstractCSQueue b = (AbstractCSQueue) cs.getQueue("root.b");
+    Assert.assertFalse(b.isDynamicQueue());
+
+    createQueue("root.a.b.b");
+
+    AbstractCSQueue bAutoParent = (AbstractCSQueue) cs.getQueue("root.a.b");
+    Assert.assertTrue(bAutoParent.isDynamicQueue());
+    Assert.assertTrue(bAutoParent.hasChildQueues());
+
+    AbstractCSQueue bAutoLeafQueue =
+        (AbstractCSQueue) cs.getQueue("root.a.b.b");
+    Assert.assertTrue(bAutoLeafQueue.isDynamicQueue());
+    Assert.assertFalse(bAutoLeafQueue.hasChildQueues());
+  }
+
   private LeafQueue createQueue(String queuePath) throws YarnException {
     return autoQueueHandler.autoCreateQueue(
         CSQueueUtils.extractQueuePath(queuePath));