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Apache Airflow errors and exceptions

Common Apache Airflow errors and exceptions with their exact messages, causes, ways to confirm them and fixes.

DAGs and scheduling

• Airflow: AirflowTaskTimeout: DagBag import timeout for dag fileThe DAG processor gave up importing a DAG file because the module took longer than [core] dagbag_import_timeout (30 seconds by default) to load. The DAG…
• Airflow: Dependencies not met for <TaskInstance>, dependency '...' FAILEDAirflow checked whether a task instance may start and one of its scheduling dependencies failed. This is an informational log line: the text after FAILED…
• Airflow: Failing N TIs without heartbeat (zombie tasks in Airflow 3)The scheduler failed task instances whose process stopped sending heartbeats for longer than [scheduler] task_instance_heartbeat_timeout (300 seconds by…