code: def _maybe_finish_job(self, job_id):
          
          job = brozzler.Job.load(self.rr, job_id)
          if not job:
              return False
          if job.status.startswith("FINISH"):
              self.logger.warn("%s is already %s", job, job.status)
              return True
  
          results = self.rr.table("sites").get_all(job_id, index="job_id").run()
          n = 0
          for result in results:
              site = brozzler.Site(self.rr, result)
              if not site.status.startswith("FINISH"):
                  results.close()
                  return False
              n += 1
  
          self.logger.info(
                  "all %s sites finished, job %s is FINISHED!", n, job.id)
          job.finish()
          job.save()
          return True
docs: Returns True if job is finished.