content: /*
   * 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 com.aliyun.odps.mapred.open.example;
  
  import java.io.IOException;
  
  import com.aliyun.odps.mapred.JobClient;
  import com.aliyun.odps.mapred.MapperBase;
  import com.aliyun.odps.mapred.conf.JobConf;
  
  public class Sleep {
  
    private static final String SLEEP_SECS = "sleep.secs";
  
    public static class MapperClass extends MapperBase {
  
      // 由于没有输入数据，map函数不会被执行，相关逻辑只能写在setup中
      @Override
      public void setup(TaskContext context) throws IOException {
        try {
          // 获取jobconf中设置的sleep秒数，进行sleep
          Thread.sleep(context.getJobConf().getInt(SLEEP_SECS, 1) * 1000);
        } catch (InterruptedException e) {
          throw new RuntimeException(e);
        }
      }
    }
  
    public static void main(String[] args) throws Exception {
      if (args.length != 1) {
        System.err.println("Usage: Sleep <sleep_secs>");
        System.exit(-1);
      }
  
      JobConf job = new JobConf();
      job.setMapperClass(MapperClass.class);
      // 这个实例也是一个MapOnly的，所以需要设置reducer个数为0
      job.setNumReduceTasks(0);
      // 由于没有输入表，mapper的个数需要由用户明确进行指定
      job.setNumMapTasks(1);
      job.set(SLEEP_SECS, args[0]);
  
      JobClient.runJob(job);
    }
  }
  