ephraimbuddy commented on a change in pull request #19769:
URL: https://github.com/apache/airflow/pull/19769#discussion_r783662283
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File path: airflow/executors/celery_executor.py
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@@ -377,6 +385,49 @@ def _check_for_stalled_adopted_tasks(self):
for key in timedout_keys:
self.change_state(key, State.FAILED)
+ @provide_session
+ def _clear_stuck_queued_tasks(self, session: Session = NEW_SESSION) ->
None:
+ """
+ Tasks can get stuck in queued state in DB while still not in
+ worker. This happens when the worker is autoscaled down and
+ the task is queued but has not been picked up by any worker prior to
the scaling.
+
+ In such situation, we update the task instance state to scheduled so
that
+ it can be queued again. We chose to use task_adoption_timeout to decide
+ """
+ if not isinstance(app.backend, DatabaseBackend):
+ # We only want to do this for database backends where
Review comment:
I can't figure how it could be solved in Redis. Do you have a
reproductive step for Redis just like in #19699
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