coufon commented on issue #5743: [AIRFLOW-5088][AIP-24] Persisting serialized DAG in DB for webserver scalability URL: https://github.com/apache/airflow/pull/5743#issuecomment-529294988 > * Do we want to let users use old versions of MySQL (and Mariadb that doesn't support JSON with sqlalchemy) or add a note and tell them that if you want to use serialisation you would need to use newer version of DB or a DB (Postgres) that supports JSON columns. Or else just keep `store_serialised_dags=False`. If we want to support old versions or DB that don't support JSON columns, that we will have to handle those exceptions and store the serialised DAG (python dicts) as string and use json.loads and json.dump. I think it makes sense to deprecate old versions of MySQL that don't support JSON (I guess it is MySQL 5.7), unless there are many affected customers. I think deprecating old versions is reasonable and it is important to keep code less redundant. > * JSON vs JSONB? - Opinions ?? We are periodically updating serialized DAGs in DB. Will using JSONB makes it more efficient?
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