1 files changed, 52 insertions, 0 deletions
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/resourcemgr/config/selectionpolicy/DefaultQueueSelection.java b/exec/java-exec/src/main/java/org/apache/drill/exec/resourcemgr/config/selectionpolicy/DefaultQueueSelection.java
new file mode 100644
index 000000000..f1c03c3f5
--- /dev/null
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/resourcemgr/config/selectionpolicy/DefaultQueueSelection.java
@@ -0,0 +1,52 @@
+/*
+ * 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.drill.exec.resourcemgr.config.selectionpolicy;
+
+import org.apache.drill.exec.ops.QueryContext;
+import org.apache.drill.exec.resourcemgr.NodeResources;
+import org.apache.drill.exec.resourcemgr.config.ResourcePool;
+import org.apache.drill.exec.resourcemgr.config.exception.QueueSelectionException;
+
+import java.util.List;
+
+/**
+ * Helps to select the first default queue in the list of all the provided queues. If there is no default queue
+ * present it throws {@link QueueSelectionException}. Default queue is a queue associated with {@link ResourcePool}
+ * which has {@link org.apache.drill.exec.resourcemgr.config.selectors.DefaultSelector} assigned to it
+ */
+public class DefaultQueueSelection extends AbstractQueueSelectionPolicy {
+  private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(DefaultQueueSelection.class);
+
+  public DefaultQueueSelection() {
+    super(SelectionPolicy.DEFAULT);
+  }
+
+  @Override
+  public ResourcePool selectQueue(List<ResourcePool> allPools, QueryContext queryContext,
+                                  NodeResources maxResourcePerNode) throws QueueSelectionException {
+    for (ResourcePool pool : allPools) {
+      if (pool.isDefaultPool()) {
+        logger.debug("Selected default pool: {} for the query: {}", pool.getPoolName(), queryContext.getQueryId());
+        return pool;
+      }
+    }
+
+    throw new QueueSelectionException(String.format("There is no default pool to select from list of pools provided " +
+      "for the query: %s", queryContext.getQueryId()));
+  }
+}