code: def wait_for_job(self, job, timeout):
      logger.debug("[k8s]wait_for_job timeout=%s", timeout)
  
      total = 0
      while self.get_job_status(job) != ProcessStatus.STOPPED:
          time.sleep(1)
          total += 1
          if timeout is None:
              # timeout is None means wait until process exits
              continue
          if total > timeout:
              logger.debug("[k8s]wait_for_job done(timeout)")
              return None
  
      v1pod = job.data
      name = v1pod.metadata.name
      namespace = v1pod.metadata.namespace
      try:
          v1pod = self.core_api.read_namespaced_pod_status(
              name, namespace
          )
      except ApiException as e:
          logger.debug(
              "[k8s] Exception when calling CoreApi->"
              "read_namespaced_pod_status: %s",
              str(e),
          )
          # job has been deleted
          return -1
  
      pod_status = v1pod.status
  
      terminated = pod_status.container_statuses[0].state.terminated
      if terminated is None:
          logger.debug(
              "[k8s]wait_for_job done: container is not terminated"
          )
          return None
  
      logger.debug(
          "[k8s]wait_for_job done: container terminated with "
          "code: {}".format(terminated.exit_code)
      )
      return terminated.exit_code
  
imports: import logging
  import multiprocessing
  import socket
  import time
  import uuid
  import psutil
  from kubernetes import client, config
  from kubernetes.client.rest import ApiException
  import fiber
  import fiber.core
  import fiber.config
  from fiber.core import ProcessStatus
  from fiber.util import find_ip_by_net_interface, find_listen_address
label_desc: Use image node_id 6 for calling the Backend obj's underlying member method code with example usage: obj.wait_for_job(job, timeout) and returns: terminated, None, None, unknown