mhenc commented on a change in pull request #21731:
URL: https://github.com/apache/airflow/pull/21731#discussion_r817106960



##########
File path: airflow/jobs/scheduler_job.py
##########
@@ -858,7 +865,7 @@ def _do_scheduling(self, session) -> int:
                     self.log.error("DAG '%s' not found in serialized_dag 
table", dag_run.dag_id)
                     continue
 
-                self._send_dag_callbacks_to_processor(dag, callback_to_run)
+                callbacks_to_send.append((dag, callback_to_run))

Review comment:
       Alternatively we could end the previous guard just before, send 
callbacks to DB then start another guard below. 
   I don't know how important it is to keep the single guard for all these 
lines 843-900




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