Airflow control the parallelism and concurrency (draw)

Airflow configuration to allow for a larger scheduling capacity and frequency:

• parallelism
• max_active_tasks_per_dag
• max_active_runs_per_dag

DAGs have configurations that improve efficiency:

• max_active_tasks: Overrides max_active_tasks_per_dag.
• max_active_runs: Overrides max_active_runs_per_dag.

Operators or tasks also have configurations that improves efficiency and scheduling priority:

• max_active_tis_per_dag: This parameter controls the number of concurrent running task instances across dag_runs per task.
• pool: See Pools.
• priority_weight: See Priority Weights.
• queue: See Queues for CeleryExecutor deployments only.

Credits

• Airflow Fundamental Concepts > Backfill
• How to control the parallelism or concurrency of an Airflow installation?