Reserialize Dags when downgrading below 3.1.0 #55981
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Downgrading to Airflow ≤3.0.x could leave the metadata DB with serializer v3 Dags that older versions cannot read or reserialize. This change automatically reserializes Dags to a compatible serializer version after a successful airflow db downgrade. On downgrade, we map the target Airflow version to a serializer version and reserialize all DAGs (skipped for --show-sql-only). The mapping is derived from a new _SER_DAG_VERSIONS_MAP, resolved from either --to-version or --to-revision. Adds db.reserialize_all_dags_to_serializer_version supporting 3→2 down-conversion. It performs a SQL fast-path for uncompressed rows across the db types and falls back to row-wise updates for compressed rows. The function does not commit and logs warnings instead of failing the CLI. Tests cover triggering on --to-version, skipping with --show-sql-only, and the --to-revision path. User impact: Downgrading to 3.0.x no longer results in incompatible v3-serialized Dags; the scheduler/UI can read Dags immediately after the downgrade.
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kaxil
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Sep 23, 2025
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| def _get_serializer_version_for_target_version(version: str) -> str | None: |
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Downgrading to Airflow ≤3.0.x could leave the metadata DB with serializer v3 Dags that older versions cannot read or reserialize. This change automatically reserializes Dags to a compatible serializer version after a successful airflow db downgrade.
On downgrade, we map the target Airflow version to a serializer version and reserialize all DAGs (skipped for --show-sql-only). The mapping is derived from a new _SER_DAG_VERSIONS_MAP, resolved from either --to-version or --to-revision.
Adds db.reserialize_all_dags_to_serializer_version supporting 3→2 down-conversion. It performs a SQL fast-path for uncompressed rows across the db types and falls back to row-wise updates for compressed rows. The function does not commit and logs warnings instead of failing the CLI.
Tests cover triggering on --to-version, skipping with --show-sql-only, and the --to-revision path.
User impact: Downgrading to 3.0.x no longer results in incompatible v3-serialized Dags; the scheduler/UI can read Dags immediately after the downgrade.