parallelism This defines the maximum number of task instances that can run concurrently in Airflow regardless of scheduler count and worker count. Generally, this value is reflective of the number of task instances with the running state in the metadata database. scheduler와 worker의 개수와 상관없이 Airflow 내에서 동시에 구동할 수 있는 task 인스턴스의 최대 개수 Configuration Reference — Airflow Documentation airflow.apache.o..