Task Dependencies

Concepts: paDependencyMgmt

What They Want to Hear 'Within a DAG, dependencies are edges: Task A runs before Task B. Across DAGs, it gets harder. Sensors poll for a signal (a file exists, a partition is populated). Event triggers fire when data is ready (Airflow datasets since v2.4). The tradeoff: sensors waste compute by polling, event triggers are more efficient but require the producer to publish a signal.'