fix: Fix Feast Java inconsistency with int64 serialization vs python

examples/java-demo/feature_repo/application-override.yaml

@@ -10,6 +10,7 @@ feature-server:
                 host: my-redis-master
                 port: 6379
                 password: [YOUR PASSWORD]
+            entityKeySerializationVersion: 2
 global:
   registry:
     path: gs://[YOUR BUCKET]/demo-repo/registry.db

examples/java-demo/feature_repo/driver_repo.py

@@ -3,24 +3,22 @@
 import pandas as pd
 
 from feast.data_source import RequestSource
-from feast.field import Field
 from feast.on_demand_feature_view import on_demand_feature_view
-from feast.request_feature_view import RequestFeatureView
 from feast.types import Float32, Float64, Int64, String
 from feast.field import Field
 
-from feast import Entity, Feature, BatchFeatureView, FileSource
+from feast import Entity, FileSource, FeatureView
 
 driver_hourly_stats = FileSource(
     path="data/driver_stats_with_string.parquet",
     timestamp_field="event_timestamp",
     created_timestamp_column="created",
 )
 driver = Entity(name="driver_id", description="driver id",)
-driver_hourly_stats_view = BatchFeatureView(
+driver_hourly_stats_view = FeatureView(
     name="driver_hourly_stats",
     entities=[driver],
-    ttl=timedelta(seconds=86400000),
+    ttl=timedelta(days=365),
     schema=[
         Field(name="conv_rate", dtype=Float32),
         Field(name="acc_rate", dtype=Float32),
@@ -42,6 +40,7 @@
     ],
 )
 
+
 # Define an on demand feature view which can generate new features based on
 # existing feature views and RequestSource features
 @on_demand_feature_view(
@@ -60,14 +59,3 @@ def transformed_conv_rate(inputs: pd.DataFrame) -> pd.DataFrame:
     df["conv_rate_plus_val2"] = inputs["conv_rate"] + inputs["val_to_add_2"]
     return df
 
-
-# Define request feature view
-driver_age_request_fv = RequestFeatureView(
-    name="driver_age",
-    request_data_source=RequestSource(
-        name="driver_age",
-        schema=[
-            Field(name="driver_age", dtype=Int64),
-        ],
-    ),
-)

examples/java-demo/feature_repo/feature_store.yaml

@@ -6,3 +6,4 @@ online_store:
   connection_string: localhost:6379,password=[YOUR PASSWORD]
 offline_store:
   type: file
+entity_key_serialization_version: 2

examples/java-demo/feature_repo/test_python_fetch.py

@@ -0,0 +1,26 @@
+from feast import FeatureStore
+
+
+def run_demo():
+    store = FeatureStore(repo_path=".")
+
+    print("\n--- Online features ---")
+    features = store.get_online_features(
+        features=[
+            "driver_hourly_stats:conv_rate",
+        ],
+        entity_rows=[
+            {
+                "driver_id": 1001,
+            },
+            {
+                "driver_id": 1002,
+            }
+        ],
+    ).to_dict()
+    for key, value in sorted(features.items()):
+        print(key, " : ", value)
+
+
+if __name__ == "__main__":
+    run_demo()

java/serving/README.md

@@ -41,7 +41,7 @@ From the Feast GitHub root, run:
    java \
      -Xms1g \
      -Xmx4g \
-     -jar java/serving/target/feast-serving-0.17.1-SNAPSHOT-jar-with-dependencies.jar \
+     -jar java/serving/target/feast-serving-[YOUR VERSION]-jar-with-dependencies.jar \
      classpath:/application.yml,file:./application-override.yaml
    ```
 5. Now you have a Feast Serving gRPC service running on port 6566 locally!
@@ -124,7 +124,7 @@ You can debug this like any other Java executable. Swap the java command above w
      -Xrunjdwp:transport=dt_socket,address=5005,server=y,suspend=y \
      -Xms1g \
      -Xmx4g \
-     -jar java/serving/target/feast-serving-0.17.1-SNAPSHOT-jar-with-dependencies.jar \
+     -jar java/serving/target/feast-serving-[YOUR VERSION]-jar-with-dependencies.jar \
      classpath:/application.yml,file:./application-override.yaml
    ```
 Now you can attach e.g. a Remote debugger in IntelliJ to port 5005 to debug / make breakpoints.

java/storage/connectors/redis/src/main/java/feast/storage/connectors/redis/retriever/EntityKeySerializerV2.java

@@ -87,14 +87,15 @@ public byte[] serialize(RedisProto.RedisKeyV2 entityKey) {
           break;
         case INT64_VAL:
           buffer.addAll(encodeInteger(ValueProto.ValueType.Enum.INT64.getNumber()));
-          buffer.addAll(encodeInteger(Integer.BYTES));
           /* This is super dumb - but in https://github.com/feast-dev/feast/blob/dcae1606f53028ce5413567fb8b66f92cfef0f8e/sdk/python/feast/infra/key_encoding_utils.py#L9
           we use `struct.pack("<l", v.int64_val)` to get the bytes of an int64 val. This actually extracts only 4 bytes,
           instead of 8 bytes as you'd expect from to serialize an int64 value.
           */
           if (this.entityKeySerializationVersion <= 1) {
+            buffer.addAll(encodeInteger(Integer.BYTES));
             buffer.addAll(encodeInteger(((Long) val.getInt64Val()).intValue()));
           } else {
+            buffer.addAll(encodeInteger(Long.BYTES));
             buffer.addAll(encodeLong(((Long) val.getInt64Val())));
           }
 

sdk/python/feast/feature_store.py

@@ -840,7 +840,7 @@ def apply(
             )
 
         for rfv in request_views_to_update:
-            data_sources_set_to_update.add(rfv.request_data_source)
+            data_sources_set_to_update.add(rfv.request_source)
 
         for odfv in odfvs_to_update:
             for v in odfv.source_request_sources.values():