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Apache Airflow Error:
AirflowDagDuplicatedIdException

What does this error mean?

Raised when a DAG's ID is already used by another DAG. This exception appears in Airflow task logs when the condition is triggered during DAG execution.

Common causes

  • 1Two DAG files define a DAG with the same dag_id.
  • 2A DAG file was copied or renamed without updating the dag_id parameter.
  • 3Multiple import paths resolve to the same DAG definition.

How to fix it

  1. 1Search all DAG files for the duplicated dag_id and rename one of them.
  2. 2Use a naming convention that ensures uniqueness across your DAG directory.
  3. 3Restart the Airflow scheduler after resolving the conflict.

Frequently asked questions

Where does AirflowDagDuplicatedIdException appear in Airflow?

In the task instance log, accessible via the Airflow UI under the failed task's Log tab, or in your log aggregation system.

Does this exception trigger a DAG retry?

Yes, if the task has retries configured. Each retry attempt creates a new task instance log entry.

Source · airflow.apache.org/docs/apache-airflow/stable/_api/airflow/exceptions/index.html

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