When I try to extend the SubDagOperator provided in airflow API, airflow webserver GUI does not recognize it as SubDagOperator thereby disabling me to zoom in to the subdag.
How can I extend the SubDagOperator while preserving the ability to zoom in to it as a subdag? Am I missing something?
Please see the example below on how to extend the SubDagOperator. The key in your case was to override the task_type function
from airflow import DAG from airflow.operators.subdag_operator import SubDagOperator from airflow.operators.dummy_operator import DummyOperator from airflow.utils.decorators import apply_defaults class ExampleSubdagSubclassOperator(SubDagOperator): template_fields = () template_ext = () @apply_defaults def __init__(self, *args, **kwargs): dag = kwargs.get('dag') task_id = kwargs.get('task_id') subdag = DAG( '{}.{}'.format(dag.dag_id, task_id), schedule_interval=dag.schedule_interval, start_date=dag.start_date ) # Replace the following 3 lines with code to automatically generate the desired tasks in the subdag t1 = DummyOperator(dag=subdag, task_id='t1') t2 = DummyOperator(dag=subdag, task_id='t2') t3 = DummyOperator(dag=subdag, task_id='t3') super(ExampleSubdagSubclassOperator, self).__init__(subdag=subdag, *args, **kwargs) # This property needs to be overridden so that the airflow UI recognises the task as a subdag and enables # the "Zoom into Sub Dag" button @property def task_type(self): return 'SubDagOperator' If you define the subdag as a dag itself this should work.
There is a good example from airflow. You also have to pay attention to the naming convention, the subdag name has to be of parent_name.child_name format.
the main dag
the subdags https://github.com/apache/incubator-airflow/blob/master/airflow/example_dags/subdags/subdag.py