vincbeck opened a new pull request, #45859:
URL: https://github.com/apache/airflow/pull/45859
In the current implementation of FileTrigger, the trigger fires and exits
immediately upon detecting the file. This behavior works well in Airflow 2
because triggers are exclusively used for deferrable operators, which are
designed to fire only once (as the trigger is deleted after firing).
In Airflow 3, however, triggers are also used to schedule DAGs based on
events, and in this context, triggers are long-running, remaining active even
after firing. For `FileTrigger`, this creates a scenario where multiple events
can be sent simultaneously because the trigger exits immediately after
detecting the file. Pausing before exiting gives some breathing room between
checks (and potentially give some time for other system to delete the file to
avoid other DAG executions).
This has no consequence for deferrable operators. The trigger will just
leave `self.poke_interval` seconds more in the triggerer. Since it is an async
operation, there is no harm.
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