fix: Rewrite Spark materialization engine to use mapInPandas (#3936)

rewrite spark materilization engine to use mapInPandas

Signed-off-by: tokoko <togurg14@freeuni.edu.ge>

sdk/python/feast/infra/materialization/contrib/spark/spark_materialization_engine.py

@@ -3,6 +3,7 @@
 from typing import Callable, List, Literal, Optional, Sequence, Union, cast
 
 import dill
+import pandas
 import pandas as pd
 import pyarrow
 from tqdm import tqdm
@@ -178,9 +179,9 @@ def _materialize_one(
                     self.repo_config.batch_engine.partitions
                 )
 
-            spark_df.foreachPartition(
-                lambda x: _process_by_partition(x, spark_serialized_artifacts)
-            )
+            spark_df.mapInPandas(
+                lambda x: _map_by_partition(x, spark_serialized_artifacts), "status int"
+            ).count()  # dummy action to force evaluation
 
             return SparkMaterializationJob(
                 job_id=job_id, status=MaterializationJobStatus.SUCCEEDED
@@ -225,38 +226,40 @@ def unserialize(self):
         return feature_view, online_store, repo_config
 
 
-def _process_by_partition(rows, spark_serialized_artifacts: _SparkSerializedArtifacts):
-    """Load pandas df to online store"""
-
-    # convert to pyarrow table
-    dicts = []
-    for row in rows:
-        dicts.append(row.asDict())
+def _map_by_partition(iterator, spark_serialized_artifacts: _SparkSerializedArtifacts):
+    for pdf in iterator:
+        if pdf.shape[0] == 0:
+            print("Skipping")
+            return
 
-    df = pd.DataFrame.from_records(dicts)
-    if df.shape[0] == 0:
-        print("Skipping")
-        return
+        table = pyarrow.Table.from_pandas(pdf)
 
-    table = pyarrow.Table.from_pandas(df)
+        (
+            feature_view,
+            online_store,
+            repo_config,
+        ) = spark_serialized_artifacts.unserialize()
+
+        if feature_view.batch_source.field_mapping is not None:
+            table = _run_pyarrow_field_mapping(
+                table, feature_view.batch_source.field_mapping
+            )
 
-    # unserialize artifacts
-    feature_view, online_store, repo_config = spark_serialized_artifacts.unserialize()
+        join_key_to_value_type = {
+            entity.name: entity.dtype.to_value_type()
+            for entity in feature_view.entity_columns
+        }
 
-    if feature_view.batch_source.field_mapping is not None:
-        table = _run_pyarrow_field_mapping(
-            table, feature_view.batch_source.field_mapping
+        rows_to_write = _convert_arrow_to_proto(
+            table, feature_view, join_key_to_value_type
+        )
+        online_store.online_write_batch(
+            repo_config,
+            feature_view,
+            rows_to_write,
+            lambda x: None,
         )
 
-    join_key_to_value_type = {
-        entity.name: entity.dtype.to_value_type()
-        for entity in feature_view.entity_columns
-    }
-
-    rows_to_write = _convert_arrow_to_proto(table, feature_view, join_key_to_value_type)
-    online_store.online_write_batch(
-        repo_config,
-        feature_view,
-        rows_to_write,
-        lambda x: None,
-    )
+    yield pd.DataFrame(
+        [pd.Series(range(1, 2))]
+    )  # dummy result because mapInPandas needs to return something