BigData / Apache Airflow Interview Questions

What is Airflow 2 vs Airflow 1 — key differences?

Airflow 2.0 (released December 2020) was a major overhaul. Key changes:

Feature	Airflow 1.x	Airflow 2.x
Scheduler HA	Single scheduler only	Multiple schedulers supported (HA)
TaskFlow API	Not available	@dag / @task decorators
Provider packages	All in monolithic airflow package	Separate installable provider packages
REST API	Experimental	Stable, versioned REST API
UI	Flask-Admin	Flask-AppBuilder with RBAC
DAG serialization	Optional	Enabled by default (faster scheduler)

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What major scheduler improvement was introduced in Airflow 2.0? Support for multiple schedulers (HA mode)

✓ Correct! Well done.

The scheduler was replaced with a cron daemon

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The scheduler was merged into the webserver

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