BigData / Apache Airflow Interview Questions

What is a TaskGroup in Airflow?

TaskGroups are a UI grouping mechanism for tasks introduced in Airflow 2.0. They collapse a set of related tasks into a single expandable node in the Graph view, making complex DAGs easier to read. Unlike SubDAGs, TaskGroups don't create a separate DAG object — they are purely visual.

from airflow.utils.task_group import TaskGroup

with DAG('etl_dag', ...) as dag:
    with TaskGroup('extract_group') as extract:
        t1 = BashOperator(task_id='extract_a', bash_command='...')
        t2 = BashOperator(task_id='extract_b', bash_command='...')
    load = BashOperator(task_id='load', bash_command='...')
    extract >> load

Take quiz

Do TaskGroups create separate DAG objects like SubDAGs? No, they are purely a visual grouping within the same DAG

✓ Correct! Well done.

Yes, each TaskGroup is an independent DAG

✗ Try again if not.

TaskGroups require the CeleryExecutor

✗ Try again if not.

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