| package org.apache.helix.taskexecution; |
| |
| /* |
| * 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. |
| */ |
| |
| import java.util.List; |
| |
| import org.apache.helix.HelixManager; |
| import org.apache.helix.HelixManagerFactory; |
| import org.apache.helix.InstanceType; |
| import org.apache.helix.constants.InstanceConstants; |
| import org.apache.helix.manager.zk.ZKHelixAdmin; |
| import org.apache.helix.manager.zk.ZNRecordSerializer; |
| import org.apache.helix.zookeeper.impl.client.ZkClient; |
| import org.apache.helix.model.InstanceConfig; |
| import org.apache.helix.participant.StateMachineEngine; |
| |
| /** |
| * Generic Worker that is a HELIX Participant which on start up joins the cluster and |
| * waits for state transitions from Helix.<br/> |
| * This class takes taskfactory and taskresultstore as arguments.<br/> |
| * As part of state transition @see {@link TaskStateModel}, |
| * it launches task corresponding to the resource id. |
| */ |
| public class Worker implements Runnable { |
| private final String _zkAddr; |
| private final String _clusterName; |
| private final String _instanceName; |
| private HelixManager _manager = null; |
| private final TaskFactory _taskFactory; |
| private final TaskResultStore _taskResultStore; |
| |
| public Worker(String zkAddr, String clusterName, String workerId, TaskFactory taskFactory, |
| TaskResultStore taskResultStore) { |
| _zkAddr = zkAddr; |
| _clusterName = clusterName; |
| _taskResultStore = taskResultStore; |
| _instanceName = "worker_" + workerId; |
| _taskFactory = taskFactory; |
| } |
| |
| public void connect() { |
| try { |
| _manager = |
| HelixManagerFactory.getZKHelixManager(_clusterName, _instanceName, |
| InstanceType.PARTICIPANT, _zkAddr); |
| |
| StateMachineEngine stateMach = _manager.getStateMachineEngine(); |
| TaskStateModelFactory modelFactory = |
| new TaskStateModelFactory(_instanceName, _taskFactory, _taskResultStore); |
| stateMach.registerStateModelFactory(TaskCluster.DEFAULT_STATE_MODEL, modelFactory); |
| |
| _manager.connect(); |
| |
| Thread.currentThread().join(); |
| } catch (InterruptedException e) { |
| System.err.println(" [-] " + _instanceName + " is interrupted ..."); |
| } catch (Exception e) { |
| // TODO Auto-generated catch block |
| e.printStackTrace(); |
| } finally { |
| disconnect(); |
| } |
| } |
| |
| public void disconnect() { |
| if (_manager != null) { |
| _manager.disconnect(); |
| } |
| } |
| |
| @Override |
| public void run() { |
| ZkClient zkclient = null; |
| try { |
| // add node to cluster if not already added |
| zkclient = |
| new ZkClient(_zkAddr, ZkClient.DEFAULT_SESSION_TIMEOUT, |
| ZkClient.DEFAULT_CONNECTION_TIMEOUT, new ZNRecordSerializer()); |
| ZKHelixAdmin admin = new ZKHelixAdmin(zkclient); |
| |
| List<String> nodes = admin.getInstancesInCluster(_clusterName); |
| if (!nodes.contains(_instanceName)) { |
| InstanceConfig config = new InstanceConfig(_instanceName); |
| config.setHostName("localhost"); |
| config.setInstanceOperation(InstanceConstants.InstanceOperation.ENABLE); |
| admin.addInstance(_clusterName, config); |
| } |
| |
| Runtime.getRuntime().addShutdownHook(new Thread() { |
| @Override |
| public void run() { |
| System.out.println("Shutting down " + _instanceName); |
| disconnect(); |
| } |
| }); |
| |
| connect(); |
| } finally { |
| if (zkclient != null) { |
| zkclient.close(); |
| } |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| if (args.length != 4) { |
| System.err |
| .println("USAGE: java Worker zookeeperAddress redisServerHost redisServerPort workerId"); |
| System.exit(1); |
| } |
| |
| final String zkAddr = args[0]; |
| final String clusterName = TaskCluster.DEFAULT_CLUSTER_NAME; |
| final String redisServerHost = args[1]; |
| final int redisServerPort = Integer.parseInt(args[2]); |
| final String workerId = args[3]; |
| |
| TaskFactory taskFactory = new AnalyticsTaskFactory(); |
| TaskResultStore taskResultStore = |
| new RedisTaskResultStore(redisServerHost, redisServerPort, 1000); |
| Worker worker = new Worker(zkAddr, clusterName, workerId, taskFactory, taskResultStore); |
| worker.run(); |
| } |
| |
| } |