Java JobConf.getCombinerClass方法代碼示例

import org.apache.hadoop.mapred.JobConf; //導入方法依賴的package包/類
@Test
/**
 * A testing method verifying availability and accessibility of API that is needed
 * for sub-classes of ShuffleConsumerPlugin
 */
public void testConsumerApi() {

  JobConf jobConf = new JobConf();
  ShuffleConsumerPlugin<K, V> shuffleConsumerPlugin = new TestShuffleConsumerPlugin<K, V>();

  //mock creation
  ReduceTask mockReduceTask = mock(ReduceTask.class);
  TaskUmbilicalProtocol mockUmbilical = mock(TaskUmbilicalProtocol.class);
  Reporter mockReporter = mock(Reporter.class);
  FileSystem mockFileSystem = mock(FileSystem.class);
  Class<? extends org.apache.hadoop.mapred.Reducer>  combinerClass = jobConf.getCombinerClass();
  @SuppressWarnings("unchecked")  // needed for mock with generic
  CombineOutputCollector<K, V>  mockCombineOutputCollector =
    (CombineOutputCollector<K, V>) mock(CombineOutputCollector.class);
  org.apache.hadoop.mapreduce.TaskAttemptID mockTaskAttemptID =
    mock(org.apache.hadoop.mapreduce.TaskAttemptID.class);
  LocalDirAllocator mockLocalDirAllocator = mock(LocalDirAllocator.class);
  CompressionCodec mockCompressionCodec = mock(CompressionCodec.class);
  Counter mockCounter = mock(Counter.class);
  TaskStatus mockTaskStatus = mock(TaskStatus.class);
  Progress mockProgress = mock(Progress.class);
  MapOutputFile mockMapOutputFile = mock(MapOutputFile.class);
  Task mockTask = mock(Task.class);

  try {
    String [] dirs = jobConf.getLocalDirs();
    // verify that these APIs are available through super class handler
    ShuffleConsumerPlugin.Context<K, V> context =
   new ShuffleConsumerPlugin.Context<K, V>(mockTaskAttemptID, jobConf, mockFileSystem,
                                              mockUmbilical, mockLocalDirAllocator,
                                              mockReporter, mockCompressionCodec,
                                              combinerClass, mockCombineOutputCollector,
                                              mockCounter, mockCounter, mockCounter,
                                              mockCounter, mockCounter, mockCounter,
                                              mockTaskStatus, mockProgress, mockProgress,
                                              mockTask, mockMapOutputFile, null);
    shuffleConsumerPlugin.init(context);
    shuffleConsumerPlugin.run();
    shuffleConsumerPlugin.close();
  }
  catch (Exception e) {
    assertTrue("Threw exception:" + e, false);
  }

  // verify that these APIs are available for 3rd party plugins
  mockReduceTask.getTaskID();
  mockReduceTask.getJobID();
  mockReduceTask.getNumMaps();
  mockReduceTask.getPartition();
  mockReporter.progress();
}
 

import org.apache.hadoop.mapred.JobConf; //導入方法依賴的package包/類
@SuppressWarnings("rawtypes")
@Test
public <K, V> void TestSucceedAndFailedCopyMap() throws Exception {
  JobConf job = new JobConf();
  job.setNumMapTasks(2);
  //mock creation
  TaskUmbilicalProtocol mockUmbilical = mock(TaskUmbilicalProtocol.class);
  Reporter mockReporter = mock(Reporter.class);
  FileSystem mockFileSystem = mock(FileSystem.class);
  Class<? extends org.apache.hadoop.mapred.Reducer>  combinerClass = job.getCombinerClass();
  @SuppressWarnings("unchecked")  // needed for mock with generic
  CombineOutputCollector<K, V>  mockCombineOutputCollector =
      (CombineOutputCollector<K, V>) mock(CombineOutputCollector.class);
  org.apache.hadoop.mapreduce.TaskAttemptID mockTaskAttemptID =
      mock(org.apache.hadoop.mapreduce.TaskAttemptID.class);
  LocalDirAllocator mockLocalDirAllocator = mock(LocalDirAllocator.class);
  CompressionCodec mockCompressionCodec = mock(CompressionCodec.class);
  Counter mockCounter = mock(Counter.class);
  TaskStatus mockTaskStatus = mock(TaskStatus.class);
  Progress mockProgress = mock(Progress.class);
  MapOutputFile mockMapOutputFile = mock(MapOutputFile.class);
  Task mockTask = mock(Task.class);
  @SuppressWarnings("unchecked")
  MapOutput<K, V> output = mock(MapOutput.class);

  ShuffleConsumerPlugin.Context<K, V> context =
      new ShuffleConsumerPlugin.Context<K, V>(
          mockTaskAttemptID, job, mockFileSystem,
          mockUmbilical, mockLocalDirAllocator,
          mockReporter, mockCompressionCodec,
          combinerClass, mockCombineOutputCollector,
          mockCounter, mockCounter, mockCounter,
          mockCounter, mockCounter, mockCounter,
          mockTaskStatus, mockProgress, mockProgress,
          mockTask, mockMapOutputFile, null);
  TaskStatus status = new TaskStatus() {
    @Override
    public boolean getIsMap() {
      return false;
    }
    @Override
    public void addFetchFailedMap(TaskAttemptID mapTaskId) {
    }
  };
  Progress progress = new Progress();
  ShuffleSchedulerImpl<K, V> scheduler = new ShuffleSchedulerImpl<K, V>(job,
      status, null, null, progress, context.getShuffledMapsCounter(),
      context.getReduceShuffleBytes(), context.getFailedShuffleCounter());

  MapHost host1 = new MapHost("host1", null);
  TaskAttemptID failedAttemptID = new TaskAttemptID(
      new org.apache.hadoop.mapred.TaskID(
      new JobID("test",0), TaskType.MAP, 0), 0);

  TaskAttemptID succeedAttemptID = new TaskAttemptID(
      new org.apache.hadoop.mapred.TaskID(
      new JobID("test",0), TaskType.MAP, 1), 1);

  // handle output fetch failure for failedAttemptID, part I
  scheduler.hostFailed(host1.getHostName());

  // handle output fetch succeed for succeedAttemptID
  long bytes = (long)500 * 1024 * 1024;
  scheduler.copySucceeded(succeedAttemptID, host1, bytes, 0, 500000, output);

  // handle output fetch failure for failedAttemptID, part II
  // for MAPREDUCE-6361: verify no NPE exception get thrown out
  scheduler.copyFailed(failedAttemptID, host1, true, false);
}