code: @Override
    public Job getJob(final JobId id) {
      log.debug("getting job: {}", id);
      final ZooKeeperClient client = provider.get("getJobId");
      return getJob(client, id);
    }
docs: Returns the job configuration for the job specified by {@code id} as a
  {@link Job} object. A return value of null indicates the job doesn't exist.