code: public RunningJob getJob(JobID jobid) throws IOException {
      JobStatus status = jobSubmitClient.getJobStatus(jobid);
      if (status != null) {
        return new NetworkedJob(status);
      } else {
        return null;
      }
    }
docs: Get an {@link RunningJob} object to track an ongoing job.  Returns
  null if the id does not correspond to any known job.
  
  @param jobid the jobid of the job.
  @return the {@link RunningJob} handle to track the job, null if the
  <code>jobid</code> doesn't correspond to any known job.
  @throws IOException