BigData / Apache Airflow Interview Questions

What is the difference between a DAG Run and a Task Instance in Airflow?

A DAG Run is an instantiation of the whole DAG for a specific data interval (logical date). It tracks the overall execution state (running, success, failed) for that interval.

A Task Instance is a specific execution of one task within a DAG Run. Each task instance belongs to exactly one DAG Run and has its own state (queued, running, success, failed, skipped, etc.).

Relationship: one DAG Run contains many Task Instances — one per task defined in the DAG.

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What is the relationship between a DAG Run and Task Instances? A DAG Run contains multiple Task Instances, one per task

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A Task Instance contains multiple DAG Runs

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They are the same concept

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