title: Failed to extract xcom from airflow pod - Kubernetes Pod Operator
body: <p>While running a DAG which runs a jar using a docker image,<br>
  <strong>xcom_push=True</strong> is given which creates another container along with the docker image in a single pod.</p>
  
  <p>DAG : </p>
  
  <pre><code>jar_task = KubernetesPodOperator(
      namespace='test',
      image="path to image",
      image_pull_secrets="secret",
      image_pull_policy="Always",
      node_selectors={"d-type":"na-node-group"},
      cmds=["sh","-c",..~running jar here~..],
      secrets=[secret_file],
      env_vars=environment_vars,
      labels={"k8s-app": "airflow"},
      name="airflow-pod",
      config_file=k8s_config_file,
      resources=pod.Resources(request_cpu=0.2,limit_cpu=0.5,request_memory='512Mi',limit_memory='1536Mi'),
      in_cluster=False,
      task_id="run_jar",
      is_delete_operator_pod=True,
      get_logs=True,
      xcom_push=True,
      dag=dag)
  </code></pre>
  
  <p>Here are the errors when the JAR is executed successfully..</p>
  
  <pre><code>    [2018-11-27 11:37:21,605] {{logging_mixin.py:95}} INFO - [2018-11-27 11:37:21,605] {{pod_launcher.py:166}} INFO - Running command... cat /airflow/xcom/return.json
      [2018-11-27 11:37:21,605] {{logging_mixin.py:95}} INFO - 
      [2018-11-27 11:37:21,647] {{logging_mixin.py:95}} INFO - [2018-11-27 11:37:21,646] {{pod_launcher.py:173}} INFO - cat: can't open '/airflow/xcom/return.json': No such file or directory
      [2018-11-27 11:37:21,647] {{logging_mixin.py:95}} INFO - 
      [2018-11-27 11:37:21,647] {{logging_mixin.py:95}} INFO - [2018-11-27 11:37:21,647] {{pod_launcher.py:166}} INFO - Running command... kill -s SIGINT 1
      [2018-11-27 11:37:21,647] {{logging_mixin.py:95}} INFO - 
      [2018-11-27 11:37:21,702] {{models.py:1760}} ERROR - Pod Launching failed: Failed to extract xcom from pod: airflow-pod-hippogriff-a4628b12
      Traceback (most recent call last):
        File "/usr/local/airflow/operators/kubernetes_pod_operator.py", line 126, in execute
          get_logs=self.get_logs)
        File "/usr/local/airflow/operators/pod_launcher.py", line 90, in run_pod
          return self._monitor_pod(pod, get_logs)
        File "/usr/local/airflow/operators/pod_launcher.py", line 110, in _monitor_pod
          result = self._extract_xcom(pod)
        File "/usr/local/airflow/operators/pod_launcher.py", line 161, in _extract_xcom
          raise AirflowException('Failed to extract xcom from pod: {}'.format(pod.name))
      airflow.exceptions.AirflowException: Failed to extract xcom from pod: airflow-pod-hippogriff-a4628b12
  
      During handling of the above exception, another exception occurred:
  
      Traceback (most recent call last):
        File "/usr/local/lib/python3.6/site-packages/airflow/models.py", line 1659, in _run_raw_task
          result = task_copy.execute(context=context)
        File "/usr/local/airflow/operators/kubernetes_pod_operator.py", line 138, in execute
          raise AirflowException('Pod Launching failed: {error}'.format(error=ex))
      airflow.exceptions.AirflowException: Pod Launching failed: Failed to extract xcom from pod: airflow-pod-hippogriff-a4628b12
      [2018-11-27 11:37:21,704] {{models.py:1789}} INFO - All retries failed; marking task as FAILED
  </code></pre>