core

dags_folder

Defines the directory from which Airflow reads DAG files.

plugins_folder

Defines the directory from which Airflow reads plugin files.

default_timezone

Default time zone setting. Supports IANA time zone identifiers.
The default value is Asia/Shanghai.

parallelism

The maximum number of tasks that can run concurrently across Airflow globally.
The default value is 32.

max_active_runs_per_dag

Defines the maximum number of DAG Runs that can be triggered simultaneously for a single DAG.
The default value is 16.

max_active_tasks_per_dag

Defines the maximum number of task instances that can run simultaneously for a single DAG.
The default value is 16.

default_task_retries

Defines the maximum number of retries for a task. Can be defined separately at the DAG and Task levels.
The default value is 0.

scheduler

parsing_processes

Controls how many Scheduler processes Airflow can use to concurrently parse DAG files.
The default value is 2.

catchup_by_default

Controls whether the Scheduler performs backfill operations between the current time and the DAG's start_date. This value does not affect backfill performed via the command line.
The default value is true.

dag_dir_list_interval

Defines how often the Scheduler scans the DAGs directory to discover new files.
The default value is 300 seconds.

min_file_process_interval

Controls how often parsed DAG files are re-parsed for updates. If the interval is too short, it will significantly increase system load.
The default value is 30 seconds.

scheduler_zombie_task_threshold

Running tasks periodically report heartbeats to the database. This parameter controls how long a task can go without reporting to the database before the Scheduler marks it as failed and reschedules it.
The default value is 300 seconds.

celery

worker_concurrency

This property takes effect when you start a worker using the airflow celery worker command. It defines the number of task instances the worker will acquire and starts a fixed number of worker threads accordingly. When you have sufficient understanding of the workload, you can use this parameter to define a fixed thread count to avoid dynamic scaling.
The default value is 16.

worker_autoscale

Defines the upper and lower limits of the celery worker thread pool in the format {{max_concurrency}},{{min_concurrency}}. Celery will maintain at least the minimum number (min_concurrency) of threads and dynamically scale based on task load. If this value is defined, the worker_concurrency configuration will be ignored.
The default value is "", example value is "16,12".

webserver

default_ui_timezone

Specifies the default time zone for displaying all data in the UI. Supports IANA time zone strings.
The default is Asia/Shanghai. If not specified, it will be consistent with default_timezone.

page_size

Uniformly controls the number of entries displayed in all list views on the Airflow UI.

default_dag_run_display_number

Controls the number of DAG Runs displayed in the UI.