import org.apache.hadoop.FailingMapper; //导入依赖的package包/类
protected Job runFailingMapperJob()
throws IOException, InterruptedException, ClassNotFoundException {
  Configuration myConf = new Configuration(mrCluster.getConfig());
  myConf.setInt(MRJobConfig.NUM_MAPS, 1);
  myConf.setInt(MRJobConfig.MAP_MAX_ATTEMPTS, 2); //reduce the number of attempts

  Job job = Job.getInstance(myConf);

  job.setJarByClass(FailingMapper.class);
  job.setJobName("failmapper");
  job.setOutputKeyClass(Text.class);
  job.setOutputValueClass(Text.class);
  job.setInputFormatClass(RandomInputFormat.class);
  job.setOutputFormatClass(TextOutputFormat.class);
  job.setMapperClass(FailingMapper.class);
  job.setNumReduceTasks(0);
  
  FileOutputFormat.setOutputPath(job, new Path(OUTPUT_ROOT_DIR,
    "failmapper-output"));
  job.addFileToClassPath(APP_JAR); // The AppMaster jar itself.
  job.submit();
  String trackingUrl = job.getTrackingURL();
  String jobId = job.getJobID().toString();
  boolean succeeded = job.waitForCompletion(true);
  Assert.assertFalse(succeeded);
  Assert.assertTrue("Tracking URL was " + trackingUrl +
                    " but didn't Match Job ID " + jobId ,
        trackingUrl.endsWith(jobId.substring(jobId.lastIndexOf("_")) + "/"));
  return job;
}
 

import org.apache.hadoop.FailingMapper; //导入依赖的package包/类
protected Job runFailingMapperJob()
throws IOException, InterruptedException, ClassNotFoundException {
  Configuration myConf = new Configuration(mrCluster.getConfig());
  myConf.setInt(MRJobConfig.NUM_MAPS, 1);
  myConf.setInt(MRJobConfig.MAP_MAX_ATTEMPTS, 2); //reduce the number of attempts

  Job job = new Job(myConf);

  job.setJarByClass(FailingMapper.class);
  job.setJobName("failmapper");
  job.setOutputKeyClass(Text.class);
  job.setOutputValueClass(Text.class);
  job.setInputFormatClass(RandomInputFormat.class);
  job.setOutputFormatClass(TextOutputFormat.class);
  job.setMapperClass(FailingMapper.class);
  job.setNumReduceTasks(0);
  
  FileOutputFormat.setOutputPath(job, new Path(OUTPUT_ROOT_DIR,
    "failmapper-output"));
  job.addFileToClassPath(APP_JAR); // The AppMaster jar itself.
  job.submit();
  String trackingUrl = job.getTrackingURL();
  String jobId = job.getJobID().toString();
  boolean succeeded = job.waitForCompletion(true);
  Assert.assertFalse(succeeded);
  Assert.assertTrue("Tracking URL was " + trackingUrl +
                    " but didn't Match Job ID " + jobId ,
        trackingUrl.endsWith(jobId.substring(jobId.lastIndexOf("_")) + "/"));
  return job;
}