Airflow Interview Questions for Data Engineers

All Airflow questions

Airflow interview questions
#	Question	Difficulty	Type
1	How do you handle task failures and alerting in Airflow?	Medium	scenario, conceptual
2	How do you make one Airflow DAG depend on another?	Medium	architecture, conceptual
3	How do you test Airflow DAGs before they reach production?	Medium	coding, conceptual
4	How should Airflow retries and idempotency work together?	Medium	conceptual, scenario
5	How would you process a variable number of files each day in Airflow?	Medium	coding, scenario
6	Poke, reschedule or deferrable: how should an Airflow sensor wait?	Medium	conceptual, optimization
7	What are the logical date and data interval in Airflow, and what changed in Airflow 3?	Medium	conceptual, debugging
8	What is the difference between catchup and backfill in Airflow 3?	Medium	conceptual, scenario
9	When should Airflow tasks pass data through XCom, and when through external storage?	Medium	conceptual, scenario
10	Airflow is slow and tasks sit in scheduled or queued. How do you find the bottleneck?	Hard	debugging, optimization
11	How do you choose an Airflow executor: Local, Celery, Kubernetes or several?	Hard	architecture, scenario
12	What changed in Airflow 3, and how would you migrate Airflow 2 DAGs?	Hard	conceptual, scenario

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