seniorData Processing
What is a data pipeline DAG and why is it important?
Updated May 15, 2026
Short answer
A DAG (Directed Acyclic Graph) represents data processing tasks and their dependencies.
Deep explanation
DAGs define execution order in systems like Apache Spark and Airflow. Each node is a transformation or task, and edges define dependencies. DAG execution allows optimization, parallelism, and fault recovery by re-executing only failed stages.
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