Examples of org.apache.hadoop.mapreduce.TaskID

org.apache.hadoop.mapreduce.TaskID
TaskID represents the immutable and unique identifier for a Map or Reduce Task. Each TaskID encompasses multiple attempts made to execute the Map or Reduce Task, each of which are uniquely indentified by their TaskAttemptID. TaskID consists of 3 parts. First part is the {@link JobID}, that this TaskInProgress belongs to. Second part of the TaskID is either 'm' or 'r' representing whether the task is a map task or a reduce task. And the third part is the task number.
An example TaskID is : task_200707121733_0003_m_000005 , which represents the fifth map task in the third job running at the jobtracker started at 200707121733.
Applications should never construct or parse TaskID strings , but rather use appropriate constructors or {@link #forName(String)} method. @see JobID @see TaskAttemptID

      //is called (we delete empty files as soon as we see them
      //in the merge method)


      //figure out the mapId 
      TaskAttemptID mapId = inputs.get(0).getMapId();
      TaskID mapTaskId = mapId.getTaskID();


      List<Segment<K, V>> inMemorySegments = new ArrayList<Segment<K, V>>();
      long mergeOutputSize = 
        createInMemorySegments(inputs, inMemorySegments,0);
      int noInMemorySegments = inMemorySegments.size();

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      return;
    }


    Job job = runFailingMapperJob();


    TaskID taskID = new TaskID(job.getJobID(), TaskType.MAP, 0);
    TaskAttemptID aId = new TaskAttemptID(taskID, 0);
    System.out.println("Diagnostics for " + aId + " :");
    for (String diag : job.getTaskDiagnostics(aId)) {
      System.out.println(diag);
    }

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  @Override
  public Task getTask(TaskId taskId) {
    if (tasksLoaded.get()) {
      return tasks.get(taskId);
    } else {
      TaskID oldTaskId = TypeConverter.fromYarn(taskId);
      CompletedTask completedTask =
          new CompletedTask(taskId, jobInfo.getAllTasks().get(oldTaskId));
      return completedTask;
    }
  }

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    // segments required to vacate memory
    List<Segment<K,V>> memDiskSegments = new ArrayList<Segment<K,V>>();
    long inMemToDiskBytes = 0;
    boolean mergePhaseFinished = false;
    if (inMemoryMapOutputs.size() > 0) {
      TaskID mapId = inMemoryMapOutputs.get(0).getMapId().getTaskID();
      inMemToDiskBytes = createInMemorySegments(inMemoryMapOutputs, 
                                                memDiskSegments,
                                                maxInMemReduce);
      final int numMemDiskSegments = memDiskSegments.size();
      if (numMemDiskSegments > 0 &&

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      //is called (we delete empty files as soon as we see them
      //in the merge method)


      //figure out the mapId 
      TaskAttemptID mapId = inputs.get(0).getMapId();
      TaskID mapTaskId = mapId.getTaskID();


      List<Segment<K, V>> inMemorySegments = new ArrayList<Segment<K, V>>();
      long mergeOutputSize = 
        createInMemorySegments(inputs, inMemorySegments,0);
      int noInMemorySegments = inMemorySegments.size();

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   * @return a string like $name-[mr]-$id$extension
   */
  public synchronized static String getUniqueFile(TaskAttemptContext context,
                                                  String name,
                                                  String extension) {
    TaskID taskId = context.getTaskAttemptID().getTaskID();
    int partition = taskId.getId();
    StringBuilder result = new StringBuilder();
    result.append(name);
    result.append('-');
    result.append(taskId.isMap() ? 'm' : 'r');
    result.append('-');
    result.append(NUMBER_FORMAT.format(partition));
    result.append(extension);
    return result.toString();
  }

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    combineInputKeyCounter = taskContext.getCounters().findCounter(TaskCounter.COMBINE_INPUT_RECORDS);
    combineInputValueCounter = taskContext.getCounters().findCounter(TaskCounter.COMBINE_OUTPUT_RECORDS);
    
    boolean isMap = conf.getBoolean(MRConfig.IS_MAP_PROCESSOR,false);
    this.mrTaskAttemptID = new TaskAttemptID(
        new TaskID(String.valueOf(taskContext.getApplicationId()
            .getClusterTimestamp()), taskContext.getApplicationId().getId(),
            isMap ? TaskType.MAP : TaskType.REDUCE,
            taskContext.getTaskIndex()), taskContext.getTaskAttemptNumber());
    
    LOG.info("Using combineKeyClass: " + keyClass + ", combineValueClass: " + valClass + ", combineComparator: " +comparator + ", useNewApi: " + useNewApi);

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    // segments required to vacate memory
    List<Segment<K,V>> memDiskSegments = new ArrayList<Segment<K,V>>();
    long inMemToDiskBytes = 0;
    boolean mergePhaseFinished = false;
    if (inMemoryMapOutputs.size() > 0) {
      TaskID mapId = inMemoryMapOutputs.get(0).getMapId().getTaskID();
      inMemToDiskBytes = createInMemorySegments(inMemoryMapOutputs, 
                                                memDiskSegments,
                                                maxInMemReduce);
      final int numMemDiskSegments = memDiskSegments.size();
      if (numMemDiskSegments > 0 &&

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      //is called (we delete empty files as soon as we see them
      //in the merge method)


      //figure out the mapId 
      TaskAttemptID mapId = inputs.get(0).getMapId();
      TaskID mapTaskId = mapId.getTaskID();


      List<Segment<K, V>> inMemorySegments = new ArrayList<Segment<K, V>>();
      long mergeOutputSize = 
        createInMemorySegments(inputs, inMemorySegments,0);
      int noInMemorySegments = inMemorySegments.size();

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          return store;
        }
          
        private DataOutputStream createOutputStream(String fieldValue) throws IOException {
          Configuration conf = ctx.getConfiguration();
          TaskID taskId = ctx.getTaskAttemptID().getTaskID();
          
          // Check whether compression is enabled, if so get the extension and add them to the path
          boolean isCompressed = getCompressOutput(ctx);
          CompressionCodec codec = null;
          String extension = "";
          if (isCompressed) {
             Class<? extends CompressionCodec> codecClass = 
                getOutputCompressorClass(ctx, GzipCodec.class);
             codec = (CompressionCodec) ReflectionUtils.newInstance(codecClass, ctx.getConfiguration());
             extension = codec.getDefaultExtension();
          }


          NumberFormat nf = NumberFormat.getInstance();
          nf.setMinimumIntegerDigits(4);


          Path path = new Path(fieldValue+extension, fieldValue + '-'
                + nf.format(taskId.getId())+extension);
          Path workOutputPath = ((FileOutputCommitter)getOutputCommitter(ctx)).getWorkPath();
          Path file = new Path(workOutputPath, path);
          FileSystem fs = file.getFileSystem(conf);                
          FSDataOutputStream fileOut = fs.create(file, false);

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