1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 package org.apache.giraph.master; 20 21 import org.apache.giraph.graph.TaskInfo; 22 23 /** 24 * Information about the master that is sent to other workers. 25 */ 26 public class MasterInfo extends TaskInfo { 27 /** Master task id is always -1 */ 28 public static final int MASTER_TASK_ID = -1; 29 /** 30 * Constructor 31 */ 32 public MasterInfo() { 33 } 34 35 /** 36 * This taskId is used internally as a unique identification of the 37 * nettyServer which runs on this task. Master is always returning -1 38 * because we need to make sure that the case when option 39 * {@link org.apache.giraph.conf.GiraphConstants#SPLIT_MASTER_WORKER} is 40 * false works correctly (master needs to have different id than the worker 41 * which runs in the same mapper) 42 * 43 * @return -1 44 */ 45 @Override 46 public int getTaskId() { 47 return MASTER_TASK_ID; 48 } 49 50 @Override 51 public String toString() { 52 return "Master(hostname=" + getHostname() + 53 ", MRtaskID=" + super.getTaskId() + 54 ", port=" + getPort() + 55 ")"; 56 } 57 }