[GitHub] [airflow] potiuk commented on issue #25585: Click "run" error: `AttributeError: 'NoneType' object has no attribute 'is_paused'`

[GitBox <gi...@apache.org>]

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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