BigData / Apache Airflow Interview Questions

What are the main components of Apache Airflow?

Apache Airflow consists of five main components:

Component	Role
Webserver	Provides the UI to monitor, trigger, and debug DAGs
Scheduler	Triggers task instances per schedule and dependency rules
Executor	Determines how and where tasks run (locally, on Celery workers, on Kubernetes, etc.)
Metadata DB	Stores state of DAGs, runs, task instances, connections, and variables
Workers	Processes that actually execute tasks (used with CeleryExecutor/KubernetesExecutor)

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Which Airflow component stores DAG run state? Webserver

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Metadata Database

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Executor

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Scheduler

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