GitHub user pykenny edited a comment on the discussion: Need help understanding 
total number of Dags oscillating on UI

As for duplicated work on DAG processors, there were some discussion about how 
to avoid such situation, and I feel like it's still an open question for now:
 - https://github.com/apache/airflow/issues/32966
 
(Update) I think distributing workload between multiple DAG processors evenly 
without having an outside organizer (for instance, scheduler) would end up with 
a distributed system design problem (e.g. introducing consensus algorithm). 
Otherwise something like randomized sorting or jittering may help with 
preventing, but not avoiding the worst scenario.

GitHub link: 
https://github.com/apache/airflow/discussions/44495#discussioncomment-12235348

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