fredthomsen opened a new pull request, #42578:
URL: https://github.com/apache/airflow/pull/42578
The DAG dependency view shows dependencies for DAGs that are available at
DAG parsing/serialization time. Dynamically mapped tasks that trigger (via
`TriggerDagRunOperator`) or wait for (via `ExternalTaskSensor`) external DAGs
are now listed as DAG dependencies provided that those dependencies are set via
`partial`, and not dynamically expanded.
Tested with the following:
```
@dag()
def triggering_dag():
"""
DAG that is doing the triggering.
"""
t = TriggerDagRunOperator.partial(
trigger_dag_id="triggered_dag",
task_id="triggering_task",
reset_dag_run=True,
).expand(trigger_run_id=["trigger_run_id1__{{ ts }}",
"trigger_run_id2__{{ ts }}"])
t
@dag()
def unmapped_triggering_dag():
"""
DAG that is doing the triggering.
"""
t = TriggerDagRunOperator(
trigger_dag_id="triggered_dag",
task_id="triggering_task",
reset_dag_run=True,
trigger_run_id="unmapped_trigger_run_id1__{{ ts }}",
)
t
@dag()
def triggered_dag():
"""
DAG that is getting triggered.
"""
@task()
def empty_task() -> int:
return 0
empty_task()
triggering_dag()
triggered_dag()
unmapped_triggering_dag()
@dag(
schedule="*/5 * * * *",
start_date=pendulum.datetime(2024, 1, 1),
catchup=False,
)
def mapped_sensor_dag():
"""
DAG that is doing the waiting/sensing.
"""
t = ExternalTaskSensor.partial(
task_id="wait",
external_dag_id="waited_on_dag",
deferrable=True,
check_existence=True,
).expand(external_task_id=["empty_task", "another_empty_task"])
t
@dag(
schedule="*/5 * * * *",
start_date=pendulum.datetime(2024, 1, 1),
catchup=False,
)
def unmapped_sensor_dag():
"""
DAG that is doing the waiting/sensing.
"""
t = ExternalTaskSensor(
task_id="wait",
external_dag_id="waited_on_dag",
external_task_id="empty_task",
deferrable=True,
check_existence=True,
)
t
@dag(
schedule="*/5 * * * *",
start_date=pendulum.datetime(2024, 1, 1),
catchup=False,
)
def waited_on_dag():
"""
DAG that is getting waited on.
"""
@task()
def empty_task() -> int:
return 0
@task()
def another_empty_task() -> int:
return 1
@task()
def yet_another_empty_task() -> int:
return 2
empty_task()
another_empty_task()
yet_another_empty_task()
waited_on_dag()
unmapped_sensor_dag()
mapped_sensor_dag()
```
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