What is a SubDAG and why is it generally discouraged?

A SubDAG is a pattern where one DAG embeds another DAG as a single task using the SubDagOperator. It was used to group related tasks and visualize them as a unit in the UI.

SubDAGs are discouraged because:

• They have their own scheduler state, which creates deadlocks in some executor configurations.
• They cannot be parallelized easily.
• They add complexity without clear benefit over TaskGroups.

The recommended replacement is TaskGroups, introduced in Airflow 2.0, which groups tasks visually without the performance and deadlock issues of SubDAGs.

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