szilard-nemeth commented on a change in pull request #3551:
URL: https://github.com/apache/hadoop/pull/3551#discussion_r731811088



##########
File path: 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/QueueNodeLabelsSettings.java
##########
@@ -0,0 +1,142 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity;
+
+import org.apache.commons.lang3.StringUtils;
+import org.apache.hadoop.util.Sets;
+import 
org.apache.hadoop.yarn.server.resourcemanager.nodelabels.RMNodeLabelsManager;
+import static 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration.ROOT;
+import java.io.IOException;
+import java.util.Set;
+
+public class QueueNodeLabelsSettings {
+  private final CSQueue parent;
+  private final String queuePath;
+  private final CapacitySchedulerContext csContext;
+  private Set<String> accessibleLabels;
+  private Set<String> configuredNodeLabels;
+  private String defaultLabelExpression;
+
+  public QueueNodeLabelsSettings(CapacitySchedulerConfiguration configuration,
+      CSQueue parent,
+      String queuePath,
+      CapacitySchedulerContext csContext) throws IOException {
+    this.parent = parent;
+    this.queuePath = queuePath;
+    this.csContext = csContext;
+    initializeNodeLabels(configuration);
+  }
+
+  private void initializeNodeLabels(CapacitySchedulerConfiguration 
configuration)
+      throws IOException {
+    initializeAccessibleLabels(configuration);
+    initializeDefaultLabelExpression(configuration);
+    initializeConfiguredNodeLabels();
+    validateNodeLabels();
+  }
+
+  private void initializeAccessibleLabels(CapacitySchedulerConfiguration 
configuration) {
+    this.accessibleLabels = configuration.getAccessibleNodeLabels(queuePath);
+    // Inherit labels from parent if not set
+    if (this.accessibleLabels == null && parent != null) {
+      this.accessibleLabels = parent.getAccessibleNodeLabels();
+    }
+  }
+
+  private void initializeDefaultLabelExpression(CapacitySchedulerConfiguration 
configuration) {
+    this.defaultLabelExpression = 
configuration.getDefaultNodeLabelExpression(queuePath);
+    // If the accessible labels is not null and the queue has a parent with a
+    // similar set of labels copy the defaultNodeLabelExpression from the 
parent
+    if (this.accessibleLabels != null && parent != null
+        && this.defaultLabelExpression == null &&
+        this.accessibleLabels.containsAll(parent.getAccessibleNodeLabels())) {
+      this.defaultLabelExpression = parent.getDefaultNodeLabelExpression();
+    }
+  }
+
+  private void initializeConfiguredNodeLabels() {
+    if (csContext.getCapacitySchedulerQueueManager() != null
+        && 
csContext.getCapacitySchedulerQueueManager().getConfiguredNodeLabels() != null) 
{
+      if (queuePath.equals(ROOT)) {

Review comment:
       As per our offline discussion with @9uapaw, this will go with the 
follow-up jira.
   




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