Gantt Chart Broken After Deleting a Task #23546

Apache Airflow version

2.2.5

What happened

After a task was deleted from a DAG we received the following message when visiting the gantt view for the DAG in the webserver.

{
  "detail": null,
  "status": 404,
  "title": "Task delete-me not found",
  "type": "https://airflow.apache.org/docs/apache-airflow/2.2.5/stable-rest-api-ref.html#section/Errors/NotFound"
}

This was only corrected by manually deleting the offending task instances from the task_instance and task_fail tables.

What you think should happen instead

I would expect the gantt chart to load either excluding the non-existent task or flagging that the task associated with task instance no longer exists.

How to reproduce

• Create a DAG with multiple tasks.
• Run the DAG.
• Delete one of the tasks.
• Attempt to open the gantt view for the DAG.

Operating System

Debian GNU/Linux 11 (bullseye)

Versions of Apache Airflow Providers

No response

Deployment

Other Docker-based deployment

Deployment details

Custom docker container hosted on Amazon ECS.

Anything else

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct