fix: Fix for SQL registry initialization fails feast-dev#4543 (feast-dev#4544)

* fix: Fix for SQL registry initialization fails feast-dev#4543

Signed-off-by: Bhargav Dodla <bdodla@expediagroup.com>

* fix: Removed combined_sql_fixtures

Signed-off-by: Bhargav Dodla <bdodla@expediagroup.com>

* fix: Added protobuf dependency to pyproject.toml

Signed-off-by: Bhargav Dodla <bdodla@expediagroup.com>

---------

Signed-off-by: Bhargav Dodla <bdodla@expediagroup.com>
Co-authored-by: Bhargav Dodla <bdodla@expediagroup.com>

Author: EXPEbdodla

pyproject.toml

@@ -1,5 +1,6 @@
 [build-system]
 requires = [
+  "protobuf<5",
   "grpcio-tools>=1.56.2,<2",
   "mypy-protobuf>=3.1",
   "pybindgen==0.22.0",

sdk/python/feast/infra/registry/caching_registry.py

@@ -19,6 +19,7 @@
 from feast.permissions.permission import Permission
 from feast.project import Project
 from feast.project_metadata import ProjectMetadata
+from feast.protos.feast.core.Registry_pb2 import Registry as RegistryProto
 from feast.saved_dataset import SavedDataset, ValidationReference
 from feast.stream_feature_view import StreamFeatureView
 from feast.utils import _utc_now
@@ -28,13 +29,14 @@
 
 class CachingRegistry(BaseRegistry):
     def __init__(self, project: str, cache_ttl_seconds: int, cache_mode: str):
-        self.cached_registry_proto = self.proto()
-        self.cached_registry_proto_created = _utc_now()
+        self.cache_mode = cache_mode
+        self.cached_registry_proto = RegistryProto()
         self._refresh_lock = Lock()
         self.cached_registry_proto_ttl = timedelta(
             seconds=cache_ttl_seconds if cache_ttl_seconds is not None else 0
         )
-        self.cache_mode = cache_mode
+        self.cached_registry_proto = self.proto()
+        self.cached_registry_proto_created = _utc_now()
         if cache_mode == "thread":
             self._start_thread_async_refresh(cache_ttl_seconds)
             atexit.register(self._exit_handler)
@@ -429,20 +431,26 @@ def refresh(self, project: Optional[str] = None):
     def _refresh_cached_registry_if_necessary(self):
         if self.cache_mode == "sync":
             with self._refresh_lock:
-                expired = (
-                    self.cached_registry_proto is None
-                    or self.cached_registry_proto_created is None
-                ) or (
-                    self.cached_registry_proto_ttl.total_seconds()
-                    > 0  # 0 ttl means infinity
-                    and (
-                        _utc_now()
-                        > (
-                            self.cached_registry_proto_created
-                            + self.cached_registry_proto_ttl
+                if self.cached_registry_proto == RegistryProto():
+                    # Avoids the need to refresh the registry when cache is not populated yet
+                    # Specially during the __init__ phase
+                    # proto() will populate the cache with project metadata if no objects are registered
+                    expired = False
+                else:
+                    expired = (
+                        self.cached_registry_proto is None
+                        or self.cached_registry_proto_created is None
+                    ) or (
+                        self.cached_registry_proto_ttl.total_seconds()
+                        > 0  # 0 ttl means infinity
+                        and (
+                            _utc_now()
+                            > (
+                                self.cached_registry_proto_created
+                                + self.cached_registry_proto_ttl
+                            )
                         )
                     )
-                )
                 if expired:
                     logger.info("Registry cache expired, so refreshing")
                     self.refresh()

sdk/python/feast/infra/registry/sql.py

@@ -251,6 +251,8 @@ def __init__(
             registry_config, SqlRegistryConfig
         ), "SqlRegistry needs a valid registry_config"
 
+        self.registry_config = registry_config
+
         self.write_engine: Engine = create_engine(
             registry_config.path, **registry_config.sqlalchemy_config_kwargs
         )
@@ -281,7 +283,7 @@ def __init__(
     def _sync_feast_metadata_to_projects_table(self):
         feast_metadata_projects: set = []
         projects_set: set = []
-        with self.write_engine.begin() as conn:
+        with self.read_engine.begin() as conn:
             stmt = select(feast_metadata).where(
                 feast_metadata.c.metadata_key == FeastMetadataKeys.PROJECT_UUID.value
             )
@@ -290,7 +292,7 @@ def _sync_feast_metadata_to_projects_table(self):
                 feast_metadata_projects.append(row._mapping["project_id"])
 
         if len(feast_metadata_projects) > 0:
-            with self.write_engine.begin() as conn:
+            with self.read_engine.begin() as conn:
                 stmt = select(projects)
                 rows = conn.execute(stmt).all()
                 for row in rows:

sdk/python/tests/integration/registration/test_universal_registry.py

@@ -1767,3 +1767,64 @@ def test_apply_entity_success_with_purge_feast_metadata(test_registry):
     assert len(entities) == 0
 
     test_registry.teardown()
+
+
+@pytest.mark.integration
+@pytest.mark.parametrize(
+    "test_registry",
+    sql_fixtures + async_sql_fixtures,
+)
+def test_apply_entity_to_sql_registry_and_reinitialize_sql_registry(test_registry):
+    entity = Entity(
+        name="driver_car_id",
+        description="Car driver id",
+        tags={"team": "matchmaking"},
+    )
+
+    project = "project"
+
+    # Register Entity
+    test_registry.apply_entity(entity, project)
+    assert_project(project, test_registry)
+
+    entities = test_registry.list_entities(project, tags=entity.tags)
+    assert_project(project, test_registry)
+
+    entity = entities[0]
+    assert (
+        len(entities) == 1
+        and entity.name == "driver_car_id"
+        and entity.description == "Car driver id"
+        and "team" in entity.tags
+        and entity.tags["team"] == "matchmaking"
+    )
+
+    entity = test_registry.get_entity("driver_car_id", project)
+    assert (
+        entity.name == "driver_car_id"
+        and entity.description == "Car driver id"
+        and "team" in entity.tags
+        and entity.tags["team"] == "matchmaking"
+    )
+
+    # After the first apply, the created_timestamp should be the same as the last_update_timestamp.
+    assert entity.created_timestamp == entity.last_updated_timestamp
+    updated_test_registry = SqlRegistry(test_registry.registry_config, "project", None)
+
+    # Update entity
+    updated_entity = Entity(
+        name="driver_car_id",
+        description="Car driver Id",
+        tags={"team": "matchmaking"},
+    )
+    updated_test_registry.apply_entity(updated_entity, project)
+
+    updated_entity = updated_test_registry.get_entity("driver_car_id", project)
+    updated_test_registry.delete_entity("driver_car_id", project)
+    assert_project(project, updated_test_registry)
+    entities = updated_test_registry.list_entities(project)
+    assert_project(project, updated_test_registry)
+    assert len(entities) == 0
+
+    updated_test_registry.teardown()
+    test_registry.teardown()