ephraimbuddy commented on code in PR #66820:
URL: https://github.com/apache/airflow/pull/66820#discussion_r3232573844
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airflow-core/src/airflow/jobs/scheduler_job_runner.py:
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@@ -1776,6 +1776,15 @@ def _do_scheduling(self, session: Session) -> int:
self._start_queued_dagruns(session)
guard.commit()
+ # Clear DagRun objects loaded by phase 1 from the identity map so
+ # phase 2 reloads them fresh. Otherwise stale rows can be
re-dirtied
+ # by flush/merge in _schedule_all_dag_runs and committed in a
row-lock
+ # order that differs from what other scheduler replicas are taking
+ # for their own work, producing A-B / B-A deadlocks on dag_run and
+ # task_instance under HA scheduler deployments. See
+ # https://github.com/apache/airflow/issues/66817.
+ session.expunge_all()
Review Comment:
I have seen a lot of PRs from you with self created issues which seems to
step from guesses instead of issues you experienced. Do you have a real log of
what you are fixing here?
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