Taragolis commented on PR #25248:
URL: https://github.com/apache/airflow/pull/25248#issuecomment-1195361223
I found that Extra Links do not work with dynamic tasks at all.
Extra links assign to parent task instance (i do not know how to correct
name this TI) but not to actual mapped TIs.
As result we only have `number extra links defined in operator` not `(number
extra links defined in operator) x number of mapped TIs`
### Sample DAG
```python
from pendulum import datetime
from airflow.decorators import dag
from airflow.sensors.external_task import ExternalTaskSensor
from airflow.operators.empty import EmptyOperator
EXTERNAL_DAG_IDS = [f"example_external_dag_{ix:02d}" for ix in range(3)]
DAG_KWARGS = {
"start_date": datetime(2022, 7, 1),
"schedule_interval": "@daily",
"catchup": False,
"tags": ["mapped_extra_links", "AIP-42", "serialization"],
}
def external_dags():
EmptyOperator(task_id="dummy")
@dag(**DAG_KWARGS)
def external_regular_task_sensor():
for external_dag_id in EXTERNAL_DAG_IDS:
ExternalTaskSensor(
task_id=f'wait_for_{external_dag_id}',
external_dag_id=external_dag_id,
poke_interval=5,
)
@dag(**DAG_KWARGS)
def external_mapped_task_sensor():
ExternalTaskSensor.partial(
task_id='wait',
poke_interval=5,
).expand(external_dag_id=EXTERNAL_DAG_IDS)
dag_external_regular_task_sensor = external_regular_task_sensor()
dag_external_mapped_task_sensor = external_mapped_task_sensor()
for dag_id in EXTERNAL_DAG_IDS:
globals()[dag_id] = dag(dag_id=dag_id, **DAG_KWARGS)(external_dags)()
```
<details>
<summary>Video Demo</summary>
https://user-images.githubusercontent.com/3998685/180994213-847b3fd3-d351-4836-b246-b54056f34ad6.mp4
</details>
Might be better do not serialize Extra Links for dynamic tasks at all?
WDYT @potiuk @uranusjr
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