widewing edited a comment on issue #18487:
URL: https://github.com/apache/airflow/issues/18487#issuecomment-937543884


   I'm having the exactly same issue in the latest version, it breaks many of 
our DAGs that rely on the catchup setting.
   
   We have DAGs scheduled every minute, most of them should finish within 1 
minute, but sometimes it could exceed, e.g. network issue, external service 
slow, etc. When this happen, it will cumulate the DagRuns that we don't expect. 
We have internal backfill mechanism already.
   
   The 
[document](https://airflow.apache.org/docs/apache-airflow/stable/dag-run.html) 
said "Turning catchup off is great if your DAG performs catchup internally." in 
section "catchup"


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