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BigData / Apache Airflow Interview Questions

How does Airflow handle templating and macros?

Airflow supports Jinja2 templating inside operator parameters that are listed in template_fields. You can inject runtime values such as execution date, data interval, and custom macros.

Common built-in macros:

  • {{ ds }} — execution date as YYYY-MM-DD.
  • {{ ds_nodash }} — execution date without dashes.
  • {{ data_interval_start }} / {{ data_interval_end }} — start/end of the data interval.
  • {{ var.value.my_var }} — an Airflow Variable value.
  • {{ conn.my_conn_id.host }} — a Connection attribute.
BashOperator(
    task_id='print_date',
    bash_command='echo Processing date: {{ ds }}'
)

Which Jinja2 macro gives you the execution date in YYYY-MM-DD format?

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