andrewgodwin opened a new pull request #18552:
URL: https://github.com/apache/airflow/pull/18552


   In the case of having several hundred triggers, the core triggerer 
creation/deletion loops would block the main thread for several hundred 
milliseconds and bring the event loop to a halt.
   
   This change allows them to yield control after every trigger they process, 
preventing this. It's unfortunately not possible to unit test reliably, but I 
ran it through its paces with 500 triggers locally.
   


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