| /** |
| * 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 java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.classification.InterfaceAudience.Private; |
| import org.apache.hadoop.yarn.api.records.ApplicationId; |
| import org.apache.hadoop.yarn.server.utils.Lock; |
| |
| /** |
| * {@link ActiveUsersManager} tracks active users in the system. |
| * A user is deemed to be active if he has any running applications with |
| * outstanding resource requests. |
| * |
| * An active user is defined as someone with outstanding resource requests. |
| */ |
| @Private |
| public class ActiveUsersManager { |
| |
| private static final Log LOG = LogFactory.getLog(ActiveUsersManager.class); |
| |
| private final QueueMetrics metrics; |
| |
| private int activeUsers = 0; |
| private Map<String, Set<ApplicationId>> usersApplications = |
| new HashMap<String, Set<ApplicationId>>(); |
| |
| public ActiveUsersManager(QueueMetrics metrics) { |
| this.metrics = metrics; |
| } |
| |
| /** |
| * An application has new outstanding requests. |
| * |
| * @param user application user |
| * @param applicationId activated application |
| */ |
| @Lock({Queue.class, SchedulerApplicationAttempt.class}) |
| synchronized public void activateApplication( |
| String user, ApplicationId applicationId) { |
| Set<ApplicationId> userApps = usersApplications.get(user); |
| if (userApps == null) { |
| userApps = new HashSet<ApplicationId>(); |
| usersApplications.put(user, userApps); |
| ++activeUsers; |
| metrics.incrActiveUsers(); |
| LOG.debug("User " + user + " added to activeUsers, currently: " + |
| activeUsers); |
| } |
| if (userApps.add(applicationId)) { |
| metrics.activateApp(user); |
| } |
| } |
| |
| /** |
| * An application has no more outstanding requests. |
| * |
| * @param user application user |
| * @param applicationId deactivated application |
| */ |
| @Lock({Queue.class, SchedulerApplicationAttempt.class}) |
| synchronized public void deactivateApplication( |
| String user, ApplicationId applicationId) { |
| Set<ApplicationId> userApps = usersApplications.get(user); |
| if (userApps != null) { |
| if (userApps.remove(applicationId)) { |
| metrics.deactivateApp(user); |
| } |
| if (userApps.isEmpty()) { |
| usersApplications.remove(user); |
| --activeUsers; |
| metrics.decrActiveUsers(); |
| LOG.debug("User " + user + " removed from activeUsers, currently: " + |
| activeUsers); |
| } |
| } |
| } |
| |
| /** |
| * Get number of active users i.e. users with applications which have pending |
| * resource requests. |
| * @return number of active users |
| */ |
| @Lock({Queue.class, SchedulerApplicationAttempt.class}) |
| synchronized public int getNumActiveUsers() { |
| return activeUsers; |
| } |
| } |