code: public Path getOutputFile(TaskAttemptID mapTaskId)
      throws IOException {
      return lDirAlloc.getLocalPathToRead(TaskTracker.getIntermediateOutputDir(
                         jobId.toString(), mapTaskId.toString())
                         + "/file.out", conf);
    }
docs: Return the path to local map output file created earlier
  @param mapTaskId a map task id