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BigData / Apache Airflow Interview Questions

What are retries and retry_delay in Airflow tasks?

Task-level retry parameters control behavior after a task failure:

  • retries — number of times Airflow will retry the task before marking it as failed. Default is 0.
  • retry_delay — how long to wait between retries (a timedelta object).
  • retry_exponential_backoff — if True, doubles the wait time after each retry.
  • max_retry_delay — caps the maximum wait time when exponential backoff is enabled.
from datetime import timedelta

t = PythonOperator(
    task_id='resilient_task',
    python_callable=my_func,
    retries=3,
    retry_delay=timedelta(minutes=5),
    retry_exponential_backoff=True
)

Which parameter causes retry wait times to increase after each failure?

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