Víctor Portals created AIRFLOW-4384:
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Summary: Support exclude from scheduling time windows
Key: AIRFLOW-4384
URL: https://issues.apache.org/jira/browse/AIRFLOW-4384
Project: Apache Airflow
Issue Type: Improvement
Components: DAG, scheduler
Reporter: Víctor Portals
I think it would be useful to include as DAG attribute a list of calendar
events to be excluded from scheduling. I've came across with the need of
excluding specific dates from scheduling, for example holidays, and I think it
could be useful for maintenance windows too.
I've been doing some tests with a custom subclass of DAG. It would accept an
attribute like
```exclude_calendar = [\{ start_date: '2019-04-22T10:00:00.000+00:00 ',
end_date: ' 2019-04-22T11:00:00.000+00:00' }, \{ start_date:
'2019-04-22T17:00:00.000+00:00 ', end_date: ' 2019-04-22T18:00:00.000+00:00' }]
```
Then, when scheduler calls following_schedule function from DAG it would check
if the following scheduled date belongs to any of the time windows included on
exclude_calendar, and if it does, it will jump to the end of the time window,
and check again, and so on until it finds a valid date.
Would be great if it could accept include_calendar too with the inverse
behavior, only scheduling if it belongs to one of the time windows, but I think
excluding will be enough for most use cases.
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