potiuk commented on issue #25585:
URL: https://github.com/apache/airflow/issues/25585#issuecomment-1207783225

   Yeah. Let's move it to discussion. I think this one is really coming from a 
race condition that should be occasional and some of them are really 
unavoidable until we introduce [DAG 
versioning](https://cwiki.apache.org/confluence/display/AIRFLOW/AIP-36+DAG+Versioning).
 Currently there are pleny of assumptions that our DAGs are in the same state 
in Scheduler, Webserver and workers and we do not even have a notion of 
"changing" DAG - there is no way to simply see that a DAG was "there" at a 
given time but was "missing" a moment later or the other way round. So if it 
changes in the middle, things like that can happen.
   
   As long as it is self-recoverable, this is not a "huge" issue and DAG 
versioning is I think the only way to solve it "well" (or at least have a 
chance to be solved in a consistent way). 


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