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My learningAPACHE AIRFLOW INTERVIEW QUESTIONSLesson 03
What Is a DAG in Airflow and Why Must It Be Acyclic?

Lesson 03

What Is a DAG in Airflow and Why Must It Be Acyclic?

Understand what a DAG (Directed Acyclic Graph) is in Apache Airflow, how it defines task execution order, and why it must be acyclic to prevent infinite loops and ensure reliable workflow scheduling.

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Curriculum

20 lessons · 40m

0/20 lessons done40m left
  1. 0102:05

    Apache Airflow – What It Is and the Problem It Solves

    02:05

  2. 0202:13

    Airflow vs Cron vs Jenkins – Why Choose Airflow?

    02:13

  3. 02:07

    What Is a DAG in Airflow and Why Must It Be Acyclic?

    02:07

  4. 0401:51

    Airflow Core Components Explained – Webserver, Scheduler, Executor, and Metadata Database

    01:51

  5. 0501:59

    Task vs Operator vs Task Instance in Airflow – Key Differences

    01:59

  6. 0601:55

    Airflow – Data Processing Tool or Orchestration Tool

    01:55

  7. 0701:54

    Airflow DAG Files – Format and Where Airflow Finds Them

    01:54

  8. 0802:01

    Idempotent Tasks in Airflow – Meaning and Importance

    02:01

  9. 0902:10

    Airflow vs Prefect vs Dagster – When to Choose Each

    02:10

  10. 1002:08

    Common Real-World Use Cases of Apache Airflow

    02:08

  11. 1101:56

    Anatomy of a Simple Airflow DAG File – Section by Section

    01:56

  12. 1201:58

    Defining Task Dependencies in Airflow Using >>, <<, and set_upstream()

    01:58

  13. 1301:47

    start_date vs execution_date vs logical_date in Airflow

    01:47

  14. 1401:56

    Airflow Catchup Explained – When to Set catchup=False

    01:56

  15. 1501:48

    No Dependency Between Tasks in Airflow – What Happens?

    01:48

  16. 1602:07

    Organizing Large Airflow DAGs – Keeping 50+ Tasks Readable

    02:07

  17. 1701:54

    Dynamic Task Mapping in Airflow with .expand() – Real-World Use Case

    01:54

  18. 1802:09

    Creating Multiple Airflow DAGs Programmatically from a Config File

    02:09

  19. 1902:05

    Maximum Tasks in an Airflow DAG and Its Impact on Scheduler Performance

    02:05

  20. 2001:56

    Why Choose Apache Airflow Over Cron Jobs or Jenkins?

    01:56