googleapis
diff --git a/Collapse file
‎packages/bigframes/bigframes/session/loader.py‎
Copy file name to clipboardExpand all lines: packages/bigframes/bigframes/session/loader.py
+37-21Lines changed: 37 additions & 21 deletions b/Collapse file
‎packages/bigframes/bigframes/session/loader.py‎
Copy file name to clipboardExpand all lines: packages/bigframes/bigframes/session/loader.py
+37-21Lines changed: 37 additions & 21 deletions
@@ -52,7 +52,10 @@
 import pandas
 import pyarrow as pa
 from google.cloud import bigquery_storage_v1
-from google.cloud.bigquery_storage_v1 import types as bq_storage_types
+from google.cloud.bigquery_storage_v1 import (
+    types as bq_storage_types,
+    writer as bq_storage_writer,
+)
 
 import bigframes._tools
 import bigframes._tools.strings
@@ -520,38 +523,51 @@ def write_data(
         )
         serialized_schema = schema.serialize().to_pybytes()
 
-        def stream_worker(work: Iterator[pa.RecordBatch]) -> str:
+        def stream_worker(
+            work: Iterator[pa.RecordBatch], max_outstanding: int = 5
+        ) -> str:
             requested_stream = bq_storage_types.WriteStream(
                 type_=bq_storage_types.WriteStream.Type.PENDING
             )
             stream = self._write_client.create_write_stream(
                 parent=parent, write_stream=requested_stream
             )
-            stream_name = stream.name
+            base_request = bq_storage_types.AppendRowsRequest(
+                write_stream=stream.name,
+            )
+            base_request.arrow_rows.writer_schema.serialized_schema = serialized_schema
 
-            def request_generator():
-                current_offset = 0
-                for batch in work:
-                    request = bq_storage_types.AppendRowsRequest(
-                        write_stream=stream.name, offset=current_offset
-                    )
+            stream_manager = bq_storage_writer.AppendRowsStream(
+                client=self._write_client, initial_request_template=base_request
+            )
+            stream_name = stream.name
+            current_offset = 0
+            futures: list[bq_storage_writer.AppendRowsFuture] = []
+
+            for batch in work:
+                if len(futures) >= max_outstanding:
+                    row_errors = futures.pop(0).result().row_errors
+                    if row_errors:
+                        raise ValueError(
+                            f"Problem loading rows: {row_errors}. {constants.FEEDBACK_LINK}"
+                        )
 
-                    request.arrow_rows.writer_schema.serialized_schema = (
-                        serialized_schema
-                    )
-                    request.arrow_rows.rows.serialized_record_batch = (
-                        batch.serialize().to_pybytes()
-                    )
+                request = bq_storage_types.AppendRowsRequest(offset=current_offset)
+                request.arrow_rows.rows.serialized_record_batch = (
+                    batch.serialize().to_pybytes()
+                )
 
-                    yield request
-                    current_offset += batch.num_rows
+                futures.append(stream_manager.send(request))
+                current_offset += batch.num_rows
 
-            responses = self._write_client.append_rows(requests=request_generator())
-            for resp in responses:
-                if resp.row_errors:
+            for future in futures:
+                row_errors = future.result().row_errors
+                if row_errors:
                     raise ValueError(
-                        f"Errors in stream {stream_name}: {resp.row_errors}"
+                        f"Problem loading rows: {row_errors}. {constants.FEEDBACK_LINK}"
                     )
+
+            stream_manager.close()
             self._write_client.finalize_write_stream(name=stream_name)
             return stream_name