hi,team:

    my dag is 1 minute schedule,one parts dag state is success,but tasks state is not yet started in a dag:

![image](https://user-images.githubusercontent.com/41068725/116344664-357d8780-a819-11eb-8010-c746ffdfdbcc.png)


   how can to fix it?
airflow/settings.py
"""
    This setting allows altering task instances before they are queued by
    the Airflow scheduler.
    To define task_instance_mutation_hook, add a ``airflow_local_settings`` module
    to your PYTHONPATH that defines this ``task_instance_mutation_hook`` function.
    This could be used, for instance, to modify the task instance during retries.
    :param task_instance: task instance to be mutated
    :type task_instance: airflow.models.taskinstance.TaskInstance
    """
def pod_mutation_hook(pod):  
    """
    This setting allows altering ``kubernetes.client.models.V1Pod`` object
    before they are passed to the Kubernetes client by the ``PodLauncher``
    for scheduling.
    To define a pod mutation hook, add a ``airflow_local_settings`` module
    to your PYTHONPATH that defines this ``pod_mutation_hook`` function.
    It receives a ``Pod`` object and can alter it where needed.
    This could be used, for instance, to add sidecar or init containers
    to every worker pod launched by KubernetesExecutor or KubernetesPodOperator.
    """
def configure_vars():
    """Configure Global Variables from airflow.cfg"""
    global SQL_ALCHEMY_CONN
    global DAGS_FOLDER
    global PLUGINS_FOLDER
    SQL_ALCHEMY_CONN = conf.get('core', 'SQL_ALCHEMY_CONN')
    DAGS_FOLDER = os.path.expanduser(conf.get('core', 'DAGS_FOLDER'))
    PLUGINS_FOLDER = conf.get('core', 'plugins_folder', fallback=os.path.join(AIRFLOW_HOME, 'plugins'))
def configure_orm(disable_connection_pool=False):