| /** |
| * 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; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.classification.InterfaceAudience.Private; |
| import org.apache.hadoop.classification.InterfaceStability.Unstable; |
| import org.apache.hadoop.yarn.api.records.QueueState; |
| import org.apache.hadoop.yarn.exceptions.YarnException; |
| import org.apache.hadoop.yarn.server.resourcemanager.reservation.ReservationSchedulerConfiguration; |
| |
| /** |
| * |
| * QueueStateManager which can be used by Scheduler to manage the queue state. |
| * |
| */ |
| // TODO: The class will be used by YARN-5734-OrgQueue for |
| // easy CapacityScheduler queue configuration management. |
| @SuppressWarnings("rawtypes") |
| @Private |
| @Unstable |
| public class QueueStateManager<T extends SchedulerQueue, |
| E extends ReservationSchedulerConfiguration> { |
| |
| private static final Log LOG = LogFactory.getLog(QueueStateManager.class); |
| |
| private SchedulerQueueManager<T, E> queueManager; |
| |
| public synchronized void initialize(SchedulerQueueManager<T, E> |
| newQueueManager) { |
| this.queueManager = newQueueManager; |
| } |
| |
| /** |
| * Stop the queue. |
| * @param queueName the queue name |
| * @throws YarnException if the queue does not exist |
| */ |
| @SuppressWarnings("unchecked") |
| public synchronized void stopQueue(String queueName) throws YarnException { |
| SchedulerQueue<T> queue = queueManager.getQueue(queueName); |
| if (queue == null) { |
| throw new YarnException("The specified queue:" + queueName |
| + " does not exist!"); |
| } |
| queue.stopQueue(); |
| } |
| |
| /** |
| * Active the queue. |
| * @param queueName the queue name |
| * @throws YarnException if the queue does not exist |
| * or the queue can not be activated. |
| */ |
| @SuppressWarnings("unchecked") |
| public synchronized void activateQueue(String queueName) |
| throws YarnException { |
| SchedulerQueue<T> queue = queueManager.getQueue(queueName); |
| if (queue == null) { |
| throw new YarnException("The specified queue:" + queueName |
| + " does not exist!"); |
| } |
| queue.activeQueue(); |
| } |
| |
| /** |
| * Whether this queue can be deleted. |
| * @param queueName the queue name |
| * @return true if the queue can be deleted |
| */ |
| @SuppressWarnings("unchecked") |
| public boolean canDelete(String queueName) { |
| SchedulerQueue<T> queue = queueManager.getQueue(queueName); |
| if (queue == null) { |
| LOG.info("The specified queue:" + queueName + " does not exist!"); |
| return false; |
| } |
| if (queue.getState() == QueueState.STOPPED){ |
| return true; |
| } |
| LOG.info("Need to stop the specific queue:" + queueName + " first."); |
| return false; |
| } |
| } |