dygger opened a new issue, #52574:
URL: https://github.com/apache/airflow/issues/52574
### Apache Airflow version
3.0.2
### If "Other Airflow 2 version" selected, which one?
_No response_
### What happened?
When accessing outlet event `extra` data in the `on_task_instance_success`
listener hook, the extra field returns an empty dict even though the task
function explicitly sets non-empty extra data.
### What you think should happen instead?
The `extra` field in outlet events should contain the data set by the task
and be accessible in the listener hook.
### How to reproduce
## DAGs
```python
with DAG(
dag_id="asset-producer",
dagrun_timeout=timedelta(minutes=10),
start_date=datetime(2021, 1, 1),
schedule=None,
catchup=False,
is_paused_upon_creation=False,
tags=["test"],
):
@task(outlets=[asset])
def produce(
*,
params: dict | None = None,
outlet_events=None,
):
outlet_events[asset].extra = {"name1": "value1", "nested_obj":
{"name2": "value2"}}
logger.info(f"Outlet events: {outlet_events}")
produce()
with DAG(
dag_id="asset-consumer",
start_date=datetime(2021, 1, 1),
schedule=[asset],
catchup=False,
is_paused_upon_creation=False,
tags=["test"],
):
@task(inlets=[asset])
def consume(*, triggering_asset_events=None):
for k, v in triggering_asset_events.items():
logger.info(f"[Consumer] triggering_asset_event: {k}: {v}")
consume()
```
## Listener
```python
@hookimpl
def on_task_instance_success(
previous_state: TaskInstanceState | None, task_instance:
RuntimeTaskInstance | TaskInstance
):
logger.info(f"on_task_instance_success: {task_instance.task_id}")
if isinstance(task_instance, RuntimeTaskInstance):
context = task_instance.get_template_context()
outlets = context["outlets"]
logger.info(f"on_task_instance_success outlets: {outlets}")
outlet_events = context["outlet_events"]
for outlet in outlets:
event = outlet_events[outlet]
logger.info(f"on_task_instance_success outlet event: {event}")
```
## Logs
### Producer (event extra is empty in the listener)
```
[2025-06-30, 16:56:00] INFO - Outlet events:
OutletEventAccessors(_dict={AssetUniqueKey(name='test-asset',
uri='test-asset'): OutletEventAccessor(key=AssetUniqueKey(name='test-asset',
uri='test-asset'), extra={'name1': 'value1', 'nested_obj': {'name2':
'value2'}}, asset_alias_events=[])}):
source="unusual_prefix_e7352dd1f756ead6f66dfc[4](http://localhost:8080/dags/asset-producer/runs/manual__2025-06-30T13:55:55.913030+00:00/tasks/produce?try_number=1#4)89eeb1b1519f4e074_outlet_test_dag"
[2025-06-30, 16:56:00] INFO - Done. Returned value was: None:
source="airflow.task.operators.airflow.providers.standard.decorators.python._PythonDecoratedOperator"
[2025-06-30, 16:56:00] INFO - on_task_instance_success: produce:
source="pipeline_run_listener"
[2025-06-30, 16:56:00] INFO - on_task_instance_success outlets:
[Asset(name='test-asset', uri='test-asset', group='asset', extra={},
watchers=[])]: source="pipeline_run_listener"
[202[5](http://localhost:8080/dags/asset-producer/runs/manual__2025-06-30T13:55:55.913030+00:00/tasks/produce?try_number=1#5)-06-30,
16:56:00] INFO - on_task_instance_success outlet event:
OutletEventAccessor(key=AssetUniqueKey(name='test-asset', uri='test-asset'),
extra={}, asset_alias_events=[]): source="pipeline_run_listener"
```
### Consumer (event extra is correct)
```
[2025-06-30, 16:56:03] INFO - [Consumer] triggering_asset_event:
Asset(name='test-asset', uri='test-asset', group='asset', extra={},
watchers=[]):
[AssetEventDagRunReferenceResult(asset=AssetReferenceAssetEventDagRun(name='test-asset',
uri='test-asset', extra={}), extra={'name1': 'value1', 'nested_obj': {'name2':
'value2'}}, source_task_id='produce', source_dag_id='asset-producer',
source_run_id='manual__2025-06-30T13:55:55.913030+00:00', source_map_index=-1,
source_aliases=[], timestamp=datetime.datetime(2025, 6, 30, 13, 56, 0, 859276,
tzinfo=TzInfo(UTC)))]:
source="unusual_prefix_e7352dd1f756ead6f66dfc[4](http://localhost:8080/dags/asset-consumer/runs/asset_triggered__2025-06-30T13:56:00.882558+00:00_orhaCyKJ/tasks/consume?try_number=1#4)89eeb1b1519f4e074_outlet_test_dag"
[2025-06-30, 16:56:03] INFO - Done. Returned value was: None:
source="airflow.task.operators.airflow.providers.standard.decorators.python._PythonDecoratedOperator"
```
### Operating System
Ubuntu 24.04.2 LTS
### Versions of Apache Airflow Providers
_No response_
### Deployment
Docker-Compose
### Deployment details
_No response_
### Anything else?
_No response_
### Are you willing to submit PR?
- [ ] Yes I am willing to submit a PR!
### Code of Conduct
- [x] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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