| /** |
| * 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.service; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Preconditions; |
| import org.apache.hadoop.yarn.event.AsyncDispatcher; |
| import org.apache.hadoop.yarn.event.EventHandler; |
| import org.apache.hadoop.yarn.service.api.records.Service; |
| import org.apache.hadoop.yarn.service.api.records.ServiceState; |
| import org.apache.hadoop.yarn.service.component.ComponentEvent; |
| import org.apache.hadoop.yarn.service.component.ComponentEventType; |
| import org.apache.hadoop.yarn.service.utils.ServiceApiUtil; |
| import org.apache.hadoop.yarn.service.utils.SliderFileSystem; |
| import org.apache.hadoop.yarn.state.InvalidStateTransitionException; |
| import org.apache.hadoop.yarn.state.MultipleArcTransition; |
| import org.apache.hadoop.yarn.state.StateMachine; |
| import org.apache.hadoop.yarn.state.StateMachineFactory; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.text.MessageFormat; |
| import java.util.EnumSet; |
| import java.util.List; |
| import java.util.concurrent.locks.ReentrantReadWriteLock; |
| |
| /** |
| * Manages the state of the service. |
| */ |
| public class ServiceManager implements EventHandler<ServiceEvent> { |
| private static final Logger LOG = LoggerFactory.getLogger( |
| ServiceManager.class); |
| |
| private final Service serviceSpec; |
| private final ServiceContext context; |
| private final ServiceScheduler scheduler; |
| private final ReentrantReadWriteLock.ReadLock readLock; |
| private final ReentrantReadWriteLock.WriteLock writeLock; |
| |
| private final StateMachine<State, ServiceEventType, ServiceEvent> |
| stateMachine; |
| |
| private final AsyncDispatcher dispatcher; |
| private final SliderFileSystem fs; |
| private final UpgradeComponentsFinder componentsFinder; |
| |
| private String upgradeVersion; |
| |
| private static final StateMachineFactory<ServiceManager, State, |
| ServiceEventType, ServiceEvent> STATE_MACHINE_FACTORY = |
| new StateMachineFactory<ServiceManager, State, |
| ServiceEventType, ServiceEvent>(State.STABLE) |
| |
| .addTransition(State.STABLE, EnumSet.of(State.STABLE, |
| State.UPGRADING), ServiceEventType.UPGRADE, |
| new StartUpgradeTransition()) |
| |
| .addTransition(State.UPGRADING, EnumSet.of(State.STABLE, |
| State.UPGRADING), ServiceEventType.START, |
| new StopUpgradeTransition()) |
| .installTopology(); |
| |
| public ServiceManager(ServiceContext context) { |
| Preconditions.checkNotNull(context); |
| this.context = context; |
| serviceSpec = context.service; |
| scheduler = context.scheduler; |
| stateMachine = STATE_MACHINE_FACTORY.make(this); |
| dispatcher = scheduler.getDispatcher(); |
| |
| ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
| readLock = lock.readLock(); |
| writeLock = lock.writeLock(); |
| fs = context.fs; |
| componentsFinder = new UpgradeComponentsFinder |
| .DefaultUpgradeComponentsFinder(); |
| } |
| |
| @Override |
| public void handle(ServiceEvent event) { |
| try { |
| writeLock.lock(); |
| State oldState = getState(); |
| try { |
| stateMachine.doTransition(event.getType(), event); |
| } catch (InvalidStateTransitionException e) { |
| LOG.error(MessageFormat.format( |
| "[SERVICE]: Invalid event {0} at {1}.", event.getType(), |
| oldState), e); |
| } |
| if (oldState != getState()) { |
| LOG.info("[SERVICE] Transitioned from {} to {} on {} event.", |
| oldState, getState(), event.getType()); |
| } |
| } finally { |
| writeLock.unlock(); |
| } |
| } |
| |
| private State getState() { |
| this.readLock.lock(); |
| try { |
| return this.stateMachine.getCurrentState(); |
| } finally { |
| this.readLock.unlock(); |
| } |
| } |
| |
| private static class StartUpgradeTransition implements |
| MultipleArcTransition<ServiceManager, ServiceEvent, State> { |
| |
| @Override |
| public State transition(ServiceManager serviceManager, |
| ServiceEvent event) { |
| try { |
| Service targetSpec = ServiceApiUtil.loadServiceUpgrade( |
| serviceManager.fs, serviceManager.getName(), event.getVersion()); |
| |
| serviceManager.serviceSpec.setState(ServiceState.UPGRADING); |
| List<org.apache.hadoop.yarn.service.api.records.Component> |
| compsThatNeedUpgrade = serviceManager.componentsFinder. |
| findTargetComponentSpecs(serviceManager.serviceSpec, targetSpec); |
| |
| if (compsThatNeedUpgrade != null && !compsThatNeedUpgrade.isEmpty()) { |
| compsThatNeedUpgrade.forEach(component -> { |
| ComponentEvent needUpgradeEvent = new ComponentEvent( |
| component.getName(), ComponentEventType.UPGRADE). |
| setTargetSpec(component); |
| serviceManager.dispatcher.getEventHandler().handle( |
| needUpgradeEvent); |
| }); |
| } |
| serviceManager.upgradeVersion = event.getVersion(); |
| return State.UPGRADING; |
| } catch (Throwable e) { |
| LOG.error("[SERVICE]: Upgrade to version {} failed", event.getVersion(), |
| e); |
| return State.STABLE; |
| } |
| } |
| } |
| |
| private static class StopUpgradeTransition implements |
| MultipleArcTransition<ServiceManager, ServiceEvent, State> { |
| |
| @Override |
| public State transition(ServiceManager serviceManager, |
| ServiceEvent event) { |
| //abort is not supported currently |
| //trigger re-check of service state |
| ServiceMaster.checkAndUpdateServiceState(serviceManager.scheduler, |
| true); |
| if (serviceManager.serviceSpec.getState().equals(ServiceState.STABLE)) { |
| return serviceManager.finalizeUpgrade() ? State.STABLE : |
| State.UPGRADING; |
| } else { |
| return State.UPGRADING; |
| } |
| } |
| } |
| |
| /** |
| * @return whether finalization of upgrade was successful. |
| */ |
| private boolean finalizeUpgrade() { |
| try { |
| Service upgradeSpec = ServiceApiUtil.loadServiceUpgrade( |
| fs, getName(), upgradeVersion); |
| ServiceApiUtil.writeAppDefinition(fs, |
| ServiceApiUtil.getServiceJsonPath(fs, getName()), upgradeSpec); |
| } catch (IOException e) { |
| LOG.error("Upgrade did not complete because unable to overwrite the" + |
| " service definition", e); |
| return false; |
| } |
| |
| try { |
| fs.deleteClusterUpgradeDir(getName(), upgradeVersion); |
| } catch (IOException e) { |
| LOG.warn("Unable to delete upgrade definition for service {} " + |
| "version {}", getName(), upgradeVersion); |
| } |
| serviceSpec.setVersion(upgradeVersion); |
| upgradeVersion = null; |
| return true; |
| } |
| |
| /** |
| * Returns the name of the service. |
| */ |
| public String getName() { |
| return serviceSpec.getName(); |
| } |
| |
| /** |
| * State of {@link ServiceManager}. |
| */ |
| public enum State { |
| STABLE, UPGRADING |
| } |
| |
| |
| @VisibleForTesting |
| Service getServiceSpec() { |
| return serviceSpec; |
| } |
| |
| } |