parisni commented on issue #19822:
URL: https://github.com/apache/airflow/issues/19822#issuecomment-979077641
still apply with 2.2.2. This does not lead to scheduler crash, still they
likely to try to insert sames dags same time resulting in pg PK errors
```
│ 2021-11-25 10:34:42.496 GMT [152] ERROR: duplicate key value violates
unique constraint "dag_pkey"
│
│ 2021-11-25 10:34:42.496 GMT [152] DETAIL: Key (dag_id)=(test_dag_386)
already exists.
│
│ 2021-11-25 10:34:42.496 GMT [152] STATEMENT: INSERT INTO dag (dag_id,
root_dag_id, is_paused, is_subdag, is_active, last_parsed_time, last_pickled,
last_e │
│ 2021-11-25 10:34:47.649 GMT [152] ERROR: duplicate key value violates
unique constraint "serialized_dag_pkey"
│
│ 2021-11-25 10:34:47.649 GMT [152] DETAIL: Key (dag_id)=(test_dag_356)
already exists.
│
│ 2021-11-25 10:34:47.649 GMT [152] STATEMENT: INSERT INTO serialized_dag
(dag_id, fileloc, fileloc_hash, data, last_updated, dag_hash) VALUES
('test_dag_35 │
│ 2021-11-25 10:34:48.731 GMT [444] ERROR: duplicate key value violates
unique constraint "serialized_dag_pkey"
│
│ 2021-11-25 10:34:48.731 GMT [444] DETAIL: Key (dag_id)=(test_dag_379)
already exists.
│
│ 2021-11-25 10:34:48.731 GMT [444] STATEMENT: INSERT INTO serialized_dag
(dag_id, fileloc, fileloc_hash, data, last_updated, dag_hash) VALUES
('test_dag_37 │
│ 2021-11-25 10:34:50.349 GMT [347] ERROR: duplicate key value violates
unique constraint "serialized_dag_pkey"
│
│ 2021-11-25 10:34:50.349 GMT [347] DETAIL: Key (dag_id)=(test_dag_379)
already exists.
│
│ 2021-11-25 10:34:50.349 GMT [347] STATEMENT: INSERT INTO serialized_dag
(dag_id, fileloc, fileloc_hash, data, last_updated, dag_hash) VALUES
('test_dag_37 │
```
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