@Marvin prefect3.1.2, how can i delete flow runs that stuck with error message "failed to cancel flow run"? I can access the postgresql.

It looks like you're dealing with an issue that's somewhat common when infrastructure associated with a flow run does not support cancellation or has already been terminated. Here are some insights and steps that might help you clear out these stuck flow runs: 1. Database Intervention: Since you mentioned you have access to PostgreSQL, you could consider manually updating the state of these flow runs in the database to mark them as canceled or failed. However, proceed with caution, as direct database manipulations can lead to data integrity issues if not done carefully. 2. Query Examples: You could run a SQL query to find the stuck flow runs and change their state. Make sure to back up your data before executing any queries:

sql
   UPDATE flow_runs SET state = 'Cancelled' WHERE state = 'Failed to cancel';

3. Scope Mismatch and Infrastructure Absence: Per the Prefect documentation, cancellation issues can occur if the infrastructure doesn't support it or has mismatched identifiers. The flow run might be marked as canceled if the infrastructure is absent but might not be enforced without the infrastructure present. 4. Further Exploration: I didn't find direct GitHub issues related to your specific error message for Prefect 3.1.2, suggesting that this might be a lesser-discussed problem or version-specific glitch. Remember, to always have backups before making significant changes, just in case something gets a little... overzealous. Hopefully, this helps you terminate those stubborn flow runs! If issues persist, consider reaching out to the Prefect community for deeper support.

@Marvin yes I tried update flow_run set state_type = 'FAILED' where id = 'uuid of the stuck flow' but the query does not end the process.

When dealing with database states directly in Prefect, changing the state in the database alone might not result in immediate changes in the live system because the Prefect orchestration layer may still consider the flow to be active until it syncs with the database or additional steps force a recalibration. Here are a few considerations and steps you can take to try and fully resolve these stuck processes: 1. Ensure Backend Services Refresh: If you've updated the database directly, ensure any Prefect services are restarted or refreshed to reflect the database changes. This can often involve restarting Prefect Apollo or Orion services, depending on how your environment is set up. 2. System Integrity: Sometimes, manual interventions risk leaving dangling processes. Consider occasionally running scripts that periodically check and sync system states based on certain discrepancies, though this approach requires detailed knowledge of Prefect's architecture. 3. Manual Resynchronization: Manual resynchronization between the Prefect orchestration and the database often involves: - Restarting any agents or services. - Using scripts or alerts to monitor discrepancies between intended state data in the UI/API and your adjusted database entries. 4. Review Related Logs: Inspect logs for any other subsystem or process that might be continuously reviving or continuing these flows, acting independently from the database state. 5. Seek Community Input: You might want to post this query to Prefect's community forums or Discord, where similar experiences from others could provide additional insight or unknown nuances with Prefect dealing directly with PostgreSQL. Unfortunately, this kind of stuck state issue often requires some investigative poking around to see what part of the system might not be letting go! Hopefully, the above methods can help you find the key to bringing those processes to a definitive halt. If not, the Prefect community is quite active and can help shed more personalized insights into your specific situation.

@Marvin okay I did it I deleted the row stuck from flow_run table, the record is not shown XD! thanks

Ah, the good old delete from the database trick! It’s like turning it off and on again, but for data. Just make sure to keep an eye on any potential side effects, as direct deletions can sometimes lead to unexpected behavior elsewhere in Prefect's orchestration. If you find any unusual behavior or need further assistance, feel free to reach out. And remember, it's always wise to run backups before wielding the mighty delete statement! Happy flow running (and deleting)! 😄