ashb commented on a change in pull request #14612:
URL: https://github.com/apache/airflow/pull/14612#discussion_r588410178
##########
File path: airflow/executors/celery_executor.py
##########
@@ -567,7 +567,7 @@ def _get_many_from_kv_backend(self, async_tasks) ->
Mapping[str, EventBufferValu
def _get_many_from_db_backend(self, async_tasks) -> Mapping[str,
EventBufferValueType]:
task_ids = _tasks_list_to_task_ids(async_tasks)
session = app.backend.ResultSession()
- task_cls = app.backend.task_cls
+ task_cls = app.backend.task_cls if hasattr(app.backend, "task_cls")
else TaskDb
Review comment:
```suggestion
task_cls = getattr(app.backend, 'task_cls', TaskDb)
```
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