millin commented on issue #40082: URL: https://github.com/apache/airflow/issues/40082#issuecomment-2253016337
I did a research. This error is the result of multiple dag-processors simultaneously trying to insert a new `serialized dag` into the table. After some time, one of the dag-processors manages to do this and the error goes away. When processing dynamic DAGs (especially if there are several hundred of them in one dag-file) it just happens more often, because inserting new rows takes more time. In the case of MWAA the error occurs very often because when starting a new image (e.g. for new worker) each time the `airflow db migrate` [command is called](https://github.com/aws/amazon-mwaa-docker-images/blob/2c0bad6b29f8f856fe4c4938a7b6d99ab626f1ec/images/airflow/2.9.2/python/mwaa/entrypoint.py#L114) from `entrypoint`, which in turn runs `reserialize_dags` and clears the whole `serialized_dag` table. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
