27.How is DAG scheduling done in Cloud Composer?
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How is DAG scheduling done in Cloud Composer?
In Cloud Composer (managed Apache Airflow on GCP), DAG scheduling is controlled using the schedule_interval parameter in the DAG definition. This parameter determines how often a DAG runs and can be set using a CRON expression (e.g., '0 12 * * *' for daily at noon) or predefined intervals like '@daily', '@hourly', '@weekly', etc.
Airflow uses the UTC timezone by default, and the DAG’s start_date plays a crucial role in determining when the first run is scheduled. It schedules tasks at the end of the period, not the beginning. For example, a daily DAG with a start_date of July 1 will run for July 1 at the beginning of July 2.
You can pause/resume DAGs from the Cloud Composer UI, and Airflow uses the scheduler service to regularly check for DAGs due to run. For dynamic control, you can set catchup=False to avoid backfilling missed intervals.
Overall, DAG scheduling in Composer offers flexible, cron-based control over task orchestration.
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