Register the set of mapper outputs created by a LocalJobRunner-based
   * job with this ReduceTask so it knows where to fetch from.
   *
   * This should not be called in normal (networked) execution.
   */
Register the set of mapper outputs created by a LocalJobRunner-based
   * job with this ReduceTask so it knows where to fetch from.
   *
   * This should not be called in normal (networked) execution.
   */ | ReduceTask.java