Fix issue #945

cosmos/constants.py

@@ -3,6 +3,7 @@
 from pathlib import Path
 
 import aenum
+from packaging.version import Version
 
 DBT_PROFILE_PATH = Path(os.path.expanduser("~")).joinpath(".dbt/profiles.yml")
 DEFAULT_DBT_PROFILE_NAME = "cosmos_profile"
@@ -20,6 +21,10 @@
 DEFAULT_OPENLINEAGE_NAMESPACE = "cosmos"
 OPENLINEAGE_PRODUCER = "https://github.com/astronomer/astronomer-cosmos/"
 
+# Cosmos will not emit datasets for the following Airflow versions, due to a breaking change that's fixed in later Airflow 2.x versions
+# https://github.com/apache/airflow/issues/39486
+PARTIALLY_SUPPORTED_AIRFLOW_VERSIONS = [Version("2.9.0"), Version("2.9.1")]
+
 
 class LoadMode(Enum):
     """

cosmos/exceptions.py

@@ -3,3 +3,7 @@
 
 class CosmosValueError(ValueError):
     """Raised when a Cosmos config value is invalid."""
+
+
+class AirflowCompatibilityError(Exception):
+    """Raised when Cosmos features are limited for Airflow version being used."""

cosmos/operators/local.py

@@ -21,6 +21,7 @@
 from cosmos import cache
 from cosmos.constants import InvocationMode
 from cosmos.dbt.project import get_partial_parse_path
+from cosmos.exceptions import AirflowCompatibilityError
 
 try:
     from airflow.datasets import Dataset
@@ -407,7 +408,21 @@ def get_datasets(self, source: Literal["inputs", "outputs"]) -> list[Dataset]:
                 dataset_uri = output.namespace + "/" + output.name
                 uris.append(dataset_uri)
         logger.debug("URIs to be converted to Dataset: %s", uris)
-        return [Dataset(uri) for uri in uris]
+
+        datasets = []
+        try:
+            datasets = [Dataset(uri) for uri in uris]
+        except ValueError as e:
+            raise AirflowCompatibilityError(
+                """
+                Apache Airflow 2.9.0 & 2.9.1 introduced a breaking change in Dataset URIs, to be fixed in newer versions:
+                https://github.com/apache/airflow/issues/39486
+
+                If you want to use Cosmos with one of these Airflow versions, you will have to disable emission of Datasets:
+                By setting ``emit_datasets=False`` in ``RenderConfig``. For more information, see https://astronomer.github.io/astronomer-cosmos/configuration/render-config.html.
+                """
+            )
+        return datasets
 
     def register_dataset(self, new_inlets: list[Dataset], new_outlets: list[Dataset]) -> None:
         """

dev/dags/example_virtualenv.py

@@ -36,6 +36,7 @@
         "py_system_site_packages": False,
         "py_requirements": ["dbt-postgres==1.6.0b1"],
         "install_deps": True,
+        "emit_datasets": False,  # Example of how to not set inlets and outlets
     },
     # normal dag parameters
     schedule_interval="@daily",

tests/operators/test_local.py

@@ -18,12 +18,13 @@
 
 from cosmos import cache
 from cosmos.config import ProfileConfig
-from cosmos.constants import InvocationMode
+from cosmos.constants import PARTIALLY_SUPPORTED_AIRFLOW_VERSIONS, InvocationMode
 from cosmos.dbt.parser.output import (
     extract_dbt_runner_issues,
     parse_number_of_warnings_dbt_runner,
     parse_number_of_warnings_subprocess,
 )
+from cosmos.exceptions import AirflowCompatibilityError
 from cosmos.operators.local import (
     DbtBuildLocalOperator,
     DbtDocsAzureStorageLocalOperator,
@@ -384,11 +385,12 @@ def test_dbt_test_local_operator_invocation_mode_methods(mock_extract_log_issues
 
 
 @pytest.mark.skipif(
-    version.parse(airflow_version) < version.parse("2.4"),
-    reason="Airflow DAG did not have datasets until the 2.4 release",
+    version.parse(airflow_version) < version.parse("2.4")
+    or version.parse(airflow_version) in PARTIALLY_SUPPORTED_AIRFLOW_VERSIONS,
+    reason="Airflow DAG did not have datasets until the 2.4 release, inlets and outlets do not work by default in Airflow 2.9.0 and 2.9.1",
 )
 @pytest.mark.integration
-def test_run_operator_dataset_inlets_and_outlets():
+def test_run_operator_dataset_inlets_and_outlets(caplog):
     from airflow.datasets import Dataset
 
     with DAG("test-id-1", start_date=datetime(2022, 1, 1)) as dag:
@@ -417,13 +419,95 @@ def test_run_operator_dataset_inlets_and_outlets():
             append_env=True,
         )
         seed_operator >> run_operator >> test_operator
+
     run_test_dag(dag)
+
     assert run_operator.inlets == []
     assert run_operator.outlets == [Dataset(uri="postgres://0.0.0.0:5432/postgres.public.stg_customers", extra=None)]
     assert test_operator.inlets == [Dataset(uri="postgres://0.0.0.0:5432/postgres.public.stg_customers", extra=None)]
     assert test_operator.outlets == []
 
 
+@pytest.mark.skipif(
+    version.parse(airflow_version) not in PARTIALLY_SUPPORTED_AIRFLOW_VERSIONS,
+    reason="Airflow 2.9.0 and 2.9.1 have a breaking change in Dataset URIs",
+    # https://github.com/apache/airflow/issues/39486
+)
+@pytest.mark.integration
+def test_run_operator_dataset_emission_fails(caplog):
+    from airflow.datasets import Dataset
+
+    with DAG("test-id-1", start_date=datetime(2022, 1, 1)) as dag:
+        seed_operator = DbtSeedLocalOperator(
+            profile_config=real_profile_config,
+            project_dir=DBT_PROJ_DIR,
+            task_id="seed",
+            dbt_cmd_flags=["--select", "raw_customers"],
+            install_deps=True,
+            append_env=True,
+        )
+        run_operator = DbtRunLocalOperator(
+            profile_config=real_profile_config,
+            project_dir=DBT_PROJ_DIR,
+            task_id="run",
+            dbt_cmd_flags=["--models", "stg_customers"],
+            install_deps=True,
+            append_env=True,
+        )
+
+        seed_operator >> run_operator
+
+    with pytest.raises(AirflowCompatibilityError) as exc:
+        run_test_dag(dag)
+
+    err_msg = str(exc.value)
+    assert (
+        "Apache Airflow 2.9.0 & 2.9.1 introduced a breaking change in Dataset URIs, to be fixed in newer versions"
+        in err_msg
+    )
+    assert (
+        "If you want to use Cosmos with one of these Airflow versions, you will have to disable emission of Datasets"
+        in err_msg
+    )
+
+
+@pytest.mark.skipif(
+    version.parse(airflow_version) not in PARTIALLY_SUPPORTED_AIRFLOW_VERSIONS,
+    reason="Airflow 2.9.0 and 2.9.1 have a breaking change in Dataset URIs",
+    # https://github.com/apache/airflow/issues/39486
+)
+@pytest.mark.integration
+def test_run_operator_dataset_emission_is_skipped(caplog):
+    from airflow.datasets import Dataset
+
+    with DAG("test-id-1", start_date=datetime(2022, 1, 1)) as dag:
+        seed_operator = DbtSeedLocalOperator(
+            profile_config=real_profile_config,
+            project_dir=DBT_PROJ_DIR,
+            task_id="seed",
+            dbt_cmd_flags=["--select", "raw_customers"],
+            install_deps=True,
+            append_env=True,
+            emit_datasets=False,
+        )
+        run_operator = DbtRunLocalOperator(
+            profile_config=real_profile_config,
+            project_dir=DBT_PROJ_DIR,
+            task_id="run",
+            dbt_cmd_flags=["--models", "stg_customers"],
+            install_deps=True,
+            append_env=True,
+            emit_datasets=False,
+        )
+
+        seed_operator >> run_operator
+
+    run_test_dag(dag)
+
+    assert run_operator.inlets == []
+    assert run_operator.outlets == []
+
+
 @pytest.mark.integration
 def test_run_operator_caches_partial_parsing(caplog, tmp_path):
     caplog.set_level(logging.DEBUG)

tests/test_example_dags.py

@@ -16,6 +16,8 @@
 from dbt.version import get_installed_version as get_dbt_version
 from packaging.version import Version
 
+from cosmos.constants import PARTIALLY_SUPPORTED_AIRFLOW_VERSIONS
+
 from . import utils as test_utils
 
 EXAMPLE_DAGS_DIR = Path(__file__).parent.parent / "dev/dags"
@@ -28,6 +30,7 @@
 
 IGNORED_DAG_FILES = ["performance_dag.py"]
 
+
 # Sort descending based on Versions and convert string to an actual version
 MIN_VER_DAG_FILE_VER: dict[Version, list[str]] = {
     Version(version): MIN_VER_DAG_FILE[version] for version in sorted(MIN_VER_DAG_FILE, key=Version, reverse=True)
@@ -50,7 +53,10 @@ def get_dag_bag() -> DagBag:
     """Create a DagBag by adding the files that are not supported to .airflowignore"""
     with open(AIRFLOW_IGNORE_FILE, "w+") as file:
         for min_version, files in MIN_VER_DAG_FILE_VER.items():
-            if Version(airflow.__version__) < min_version:
+            if (
+                Version(airflow.__version__) < min_version
+                or Version(airflow.__version__) in PARTIALLY_SUPPORTED_AIRFLOW_VERSIONS
+            ):
                 print(f"Adding {files} to .airflowignore")
                 file.writelines([f"{file}\n" for file in files])