nicogelders opened a new issue #19304:
URL: https://github.com/apache/airflow/issues/19304
### Apache Airflow version
2.2.0 (latest released)
### Operating System
Mac
### Versions of Apache Airflow Providers
_No response_
### Deployment
Other Docker-based deployment
### Deployment details
_No response_
### What happened
Getting an exception when returning None from next_dagrun_info in a custom
timetable. The timetable protocol says that when None is returned a DagRun will
not happen but right now it throws an exception.
Exception:
```
Traceback (most recent call last):
File
"/home/airflow/.local/lib/python3.9/site-packages/airflow/jobs/scheduler_job.py",
line 623, in _execute
self._run_scheduler_loop()
File
"/home/airflow/.local/lib/python3.9/site-packages/airflow/jobs/scheduler_job.py",
line 704, in _run_scheduler_loop
num_queued_tis = self._do_scheduling(session)
File
"/home/airflow/.local/lib/python3.9/site-packages/airflow/jobs/scheduler_job.py",
line 787, in _do_scheduling
callback_to_run = self._schedule_dag_run(dag_run, session)
File
"/home/airflow/.local/lib/python3.9/site-packages/airflow/jobs/scheduler_job.py",
line 1039, in _schedule_dag_run
self._update_dag_next_dagruns(dag, dag_model, active_runs)
File
"/home/airflow/.local/lib/python3.9/site-packages/airflow/jobs/scheduler_job.py",
line 930, in _update_dag_next_dagruns
data_interval = dag.get_next_data_interval(dag_model)
File
"/home/airflow/.local/lib/python3.9/site-packages/airflow/models/dag.py", line
629, in get_next_data_interval
return self.infer_automated_data_interval(dag_model.next_dagrun)
File
"/home/airflow/.local/lib/python3.9/site-packages/airflow/models/dag.py", line
671, in infer_automated_data_interval
raise ValueError(f"Not a valid timetable: {self.timetable!r}")
ValueError: Not a valid timetable:
<my_timetables.workday_timetable.WorkdayTimetable object at 0x7f42b1f02430>
```
### What you expected to happen
DagRun to not happen.
### How to reproduce
Create a custom timetable and return None in next_dagrun_info after a few
DagRuns are created by that timetable
### Anything else
_No response_
### Are you willing to submit PR?
- [ ] Yes I am willing to submit a PR!
### Code of Conduct
- [X] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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