How to define a DAG that scheduler a monthly job together with a daily job?

Question

I have to

• update a table Foo monthly
• and another table Bar daily
• and join these two tables daily and insert the res

Answer 1

This behaviour can be achieved within single DAG using either of following alternatives

• ShortCircuitOperator
• AirflowSkipException (better in my opinion)

Basically, your DAG would still run each day (schedule_interval='@daily'), but

• on a daily basis, only your Bar task would run while Foo would get skipped (or short-circuited);
• until on some particular day (like 5th of each month) when both would run.

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You can, of course, also model these as separate DAGs and chain them together (rather than individual tasks within a single DAG). This choice might be better as long as the number of DAGs that you are linking together is small.

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Related: Schedule airflow job bi-weekly