| /** |
| * 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.io.File; |
| import java.io.IOException; |
| 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 java.util.Collections; |
| |
| import org.apache.hadoop.thirdparty.com.google.common.annotations.VisibleForTesting; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileUtil; |
| import org.apache.hadoop.service.AbstractService; |
| import org.apache.hadoop.yarn.api.records.NodeLabel; |
| |
| /** |
| * Provides base implementation of NodeDescriptorsProvider with Timer and |
| * expects subclass to provide TimerTask which can fetch node descriptors. |
| */ |
| public abstract class AbstractNodeDescriptorsProvider<T> |
| extends AbstractService implements NodeDescriptorsProvider<T> { |
| public static final long DISABLE_NODE_DESCRIPTORS_PROVIDER_FETCH_TIMER = -1; |
| |
| // Delay after which timer task are triggered to fetch node descriptors. |
| // Default interval is -1 means it is an one time task, each implementation |
| // will override this value from configuration. |
| private long intervalTime = -1; |
| |
| // Timer used to schedule node descriptors fetching |
| private Timer scheduler; |
| |
| protected Lock readLock = null; |
| protected Lock writeLock = null; |
| |
| protected TimerTask timerTask; |
| |
| private Set<T> nodeDescriptors = Collections |
| .unmodifiableSet(new HashSet<>(0)); |
| |
| public AbstractNodeDescriptorsProvider(String name) { |
| super(name); |
| } |
| |
| public long getIntervalTime() { |
| return intervalTime; |
| } |
| |
| public void setIntervalTime(long intervalMS) { |
| this.intervalTime = intervalMS; |
| } |
| |
| @Override |
| protected void serviceInit(Configuration conf) throws Exception { |
| ReadWriteLock readWriteLock = new ReentrantReadWriteLock(); |
| readLock = readWriteLock.readLock(); |
| writeLock = readWriteLock.writeLock(); |
| super.serviceInit(conf); |
| } |
| |
| @Override |
| protected void serviceStart() throws Exception { |
| timerTask = createTimerTask(); |
| timerTask.run(); |
| long taskInterval = getIntervalTime(); |
| if (taskInterval != DISABLE_NODE_DESCRIPTORS_PROVIDER_FETCH_TIMER) { |
| scheduler = |
| new Timer("DistributedNodeDescriptorsRunner-Timer", true); |
| // Start the timer task and then periodically at the configured interval |
| // time. Illegal values for intervalTime is handled by timer api |
| scheduler.schedule(timerTask, taskInterval, taskInterval); |
| } |
| super.serviceStart(); |
| } |
| |
| /** |
| * terminate the timer |
| * @throws Exception |
| */ |
| @Override |
| protected void serviceStop() throws Exception { |
| if (scheduler != null) { |
| scheduler.cancel(); |
| } |
| cleanUp(); |
| super.serviceStop(); |
| } |
| |
| /** |
| * method for subclasses to cleanup. |
| */ |
| protected abstract void cleanUp() throws Exception ; |
| |
| /** |
| * @return Returns output from provider. |
| */ |
| @Override |
| public Set<T> getDescriptors() { |
| readLock.lock(); |
| try { |
| return this.nodeDescriptors; |
| } finally { |
| readLock.unlock(); |
| } |
| } |
| |
| @Override |
| public void setDescriptors(Set<T> descriptorsSet) { |
| writeLock.lock(); |
| try { |
| this.nodeDescriptors = descriptorsSet; |
| } finally { |
| writeLock.unlock(); |
| } |
| } |
| |
| /** |
| * Method used to determine if or not node descriptors fetching script is |
| * configured and whether it is fit to run. Returns true if following |
| * conditions are met: |
| * |
| * <ol> |
| * <li>Path to the script is not empty</li> |
| * <li>The script file exists</li> |
| * </ol> |
| * |
| * @throws IOException |
| */ |
| protected void verifyConfiguredScript(String scriptPath) |
| throws IOException { |
| boolean invalidConfiguration; |
| if (scriptPath == null |
| || scriptPath.trim().isEmpty()) { |
| invalidConfiguration = true; |
| } else { |
| File f = new File(scriptPath); |
| invalidConfiguration = !f.exists() || !FileUtil.canExecute(f); |
| } |
| if (invalidConfiguration) { |
| throw new IOException( |
| "Node descriptors provider script \"" + scriptPath |
| + "\" is not configured properly. Please check whether" |
| + " the script path exists, owner and the access rights" |
| + " are suitable for NM process to execute it"); |
| } |
| } |
| |
| 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; |
| } |
| |
| @VisibleForTesting |
| public Timer getScheduler() { |
| return this.scheduler; |
| } |
| |
| /** |
| * Creates a timer task which be scheduled periodically by the provider, |
| * and the task is responsible to update node descriptors to the provider. |
| * @return a timer task. |
| */ |
| public abstract TimerTask createTimerTask(); |
| } |