uranusjr commented on PR #29569:
URL: https://github.com/apache/airflow/pull/29569#issuecomment-1434273684

   I tried a few approaches. Simply calling `job.scheduler` in 
`scheduler_command` feels wrong to me (although it does the right thing) since 
it leaks the fact that the attribute is actually a cached property 
instantiating the default executor. But putting the validation in 
ExecutionLoader is actually not optimal since that makes the logic runs every 
time we instantiate an executor (e.g. for backfill).
   
   Right now I’m moving the validation logic to `conf` as a free function and 
make it cached so it’s called exactly once. We’ll still call it in 
ExecutorLoader (to make sure all loader calls return a valid executor class), 
but also call it eagerly in `scheduler_command`.


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