| /** |
| * 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.nodemanager.nodelabels; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| import java.util.Timer; |
| import java.util.TimerTask; |
| import java.util.concurrent.locks.Lock; |
| import java.util.concurrent.locks.ReadWriteLock; |
| import java.util.concurrent.locks.ReentrantReadWriteLock; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.service.AbstractService; |
| import org.apache.hadoop.yarn.api.records.NodeLabel; |
| import org.apache.hadoop.yarn.conf.YarnConfiguration; |
| import org.apache.hadoop.yarn.nodelabels.CommonNodeLabelsManager; |
| |
| /** |
| * Provides base implementation of NodeLabelsProvider with Timer and expects |
| * subclass to provide TimerTask which can fetch NodeLabels |
| */ |
| public abstract class AbstractNodeLabelsProvider extends AbstractService |
| implements NodeLabelsProvider { |
| public static final long DISABLE_NODE_LABELS_PROVIDER_FETCH_TIMER = -1; |
| |
| // Delay after which timer task are triggered to fetch NodeLabels |
| protected long intervalTime; |
| |
| // Timer used to schedule node labels fetching |
| protected Timer nodeLabelsScheduler; |
| |
| public static final String NODE_LABELS_SEPRATOR = ","; |
| |
| protected Lock readLock = null; |
| protected Lock writeLock = null; |
| |
| protected TimerTask timerTask; |
| |
| protected Set<NodeLabel> nodeLabels = |
| CommonNodeLabelsManager.EMPTY_NODELABEL_SET; |
| |
| |
| public AbstractNodeLabelsProvider(String name) { |
| super(name); |
| } |
| |
| @Override |
| protected void serviceInit(Configuration conf) throws Exception { |
| this.intervalTime = |
| conf.getLong(YarnConfiguration.NM_NODE_LABELS_PROVIDER_FETCH_INTERVAL_MS, |
| YarnConfiguration.DEFAULT_NM_NODE_LABELS_PROVIDER_FETCH_INTERVAL_MS); |
| |
| ReadWriteLock readWriteLock = new ReentrantReadWriteLock(); |
| readLock = readWriteLock.readLock(); |
| writeLock = readWriteLock.writeLock(); |
| super.serviceInit(conf); |
| } |
| |
| @Override |
| protected void serviceStart() throws Exception { |
| timerTask = createTimerTask(); |
| timerTask.run(); |
| if (intervalTime != DISABLE_NODE_LABELS_PROVIDER_FETCH_TIMER) { |
| nodeLabelsScheduler = |
| new Timer("DistributedNodeLabelsRunner-Timer", true); |
| // Start the timer task and then periodically at the configured interval |
| // time. Illegal values for intervalTime is handled by timer api |
| nodeLabelsScheduler.scheduleAtFixedRate(timerTask, intervalTime, |
| intervalTime); |
| } |
| super.serviceStart(); |
| } |
| |
| /** |
| * terminate the timer |
| * @throws Exception |
| */ |
| @Override |
| protected void serviceStop() throws Exception { |
| if (nodeLabelsScheduler != null) { |
| nodeLabelsScheduler.cancel(); |
| } |
| cleanUp(); |
| super.serviceStop(); |
| } |
| |
| /** |
| * method for subclasses to cleanup. |
| */ |
| protected abstract void cleanUp() throws Exception ; |
| |
| /** |
| * @return Returns output from provider. |
| */ |
| @Override |
| public Set<NodeLabel> getNodeLabels() { |
| readLock.lock(); |
| try { |
| return nodeLabels; |
| } finally { |
| readLock.unlock(); |
| } |
| } |
| |
| protected void setNodeLabels(Set<NodeLabel> nodeLabelsSet) { |
| writeLock.lock(); |
| try { |
| nodeLabels = nodeLabelsSet; |
| } finally { |
| writeLock.unlock(); |
| } |
| } |
| |
| static Set<NodeLabel> convertToNodeLabelSet(String partitionNodeLabel) { |
| if (null == partitionNodeLabel) { |
| return null; |
| } |
| Set<NodeLabel> labels = new HashSet<NodeLabel>(); |
| labels.add(NodeLabel.newInstance(partitionNodeLabel)); |
| return labels; |
| } |
| |
| /** |
| * Used only by tests to access the timer task directly |
| * |
| * @return the timer task |
| */ |
| TimerTask getTimerTask() { |
| return timerTask; |
| } |
| |
| public abstract TimerTask createTimerTask(); |
| } |