BigData / Apache Airflow Interview Questions

What are Airflow task states and what do they mean?

Each Task Instance in Airflow goes through a lifecycle represented by states:

State	Meaning
none	Not yet scheduled
scheduled	Dependency met, waiting for executor
queued	Sent to executor, waiting for a worker slot
running	Currently executing
success	Completed without error
failed	Terminated with an error
skipped	Not run due to branching or trigger rule
up_for_retry	Failed but has retries remaining
up_for_reschedule	Sensor released its slot and is polling again
deferred	Waiting for an async trigger to fire

Take quiz

What state does a task enter when it fails but retries are still available? up_for_retry

✓ Correct! Well done.

failed

✗ Try again if not.

queued

✗ Try again if not.

deferred

✗ Try again if not.

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