code: public TaskCompletionEvent[] getTaskCompletionEvents(int startFrom
                                                         ) throws IOException {
      ensureState(JobState.RUNNING);
      return info.getTaskCompletionEvents(startFrom);
    }
docs: Get events indicating completion (success/failure) of component tasks.
  
  @param startFrom index to start fetching events from
  @return an array of {@link TaskCompletionEvent}s
  @throws IOException