This project has retired. For details please refer to its Attic page.
MasterInfo xref
View Javadoc

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  }