Instantiate one straem per thread

airbyte_cdk/sources/declarative/concurrent_declarative_source.py

@@ -3,7 +3,7 @@
 #
 
 import logging
-from typing import Any, Generic, Iterator, List, Mapping, Optional, Tuple, Union
+from typing import Any, Callable, Generic, Iterator, List, Mapping, Optional, Tuple, Union
 
 from airbyte_cdk.models import (
     AirbyteCatalog,
@@ -229,7 +229,7 @@ def _group_streams(
                         declarative_stream.retriever.cursor = None
 
                     partition_generator = CursorPartitionGenerator(
-                        stream=declarative_stream,
+                        stream_factory=self._new_stream_instance_factory(declarative_stream, config),
                         message_repository=self.message_repository,  # type: ignore  # message_repository is always instantiated with a value by factory
                         cursor=cursor,
                         connector_state_converter=connector_state_converter,
@@ -344,3 +344,15 @@ def _remove_concurrent_streams_from_catalog(
                 if stream.stream.name not in concurrent_stream_names
             ]
         )
+
+    def _new_stream_instance_factory(self, stream_to_copy: Stream, config: Mapping[str, Any]) -> Callable[[], Stream]:
+        """
+        Some of the declarative components are stateful. Therefore, we create one stream per thread in order to avoid threads updating
+        the same field for a specific instance.
+        """
+        def _create_new_stream() -> Stream:
+            streams_with_same_name = list(filter(lambda stream: stream.name == stream_to_copy.name, self.streams(config)))
+            if len(streams_with_same_name) == 1:
+                return streams_with_same_name[0]
+            raise ValueError(f"Expected one stream with name `{stream_to_copy.name}` but got {len(streams_with_same_name)}")
+        return _create_new_stream

airbyte_cdk/sources/streams/concurrent/adapters.py

@@ -6,7 +6,7 @@
 import json
 import logging
 from functools import lru_cache
-from typing import Any, Iterable, List, Mapping, MutableMapping, Optional, Tuple, Union
+from typing import Any, Callable, Iterable, List, Mapping, MutableMapping, Optional, Tuple, Union
 
 from airbyte_cdk.models import (
     AirbyteLogMessage,
@@ -390,7 +390,7 @@ class CursorPartitionGenerator(PartitionGenerator):
 
     def __init__(
         self,
-        stream: Stream,
+        stream_factory: Callable[[], Stream],
         message_repository: MessageRepository,
         cursor: Cursor,
         connector_state_converter: DateTimeStreamStateConverter,
@@ -400,12 +400,12 @@ def __init__(
         """
         Initialize the CursorPartitionGenerator with a stream, sync mode, and cursor.
 
-        :param stream: The stream to delegate to for partition generation.
+        :param stream_factory: The stream factory that created the stream to delegate to for partition generation.
         :param message_repository: The message repository to use to emit non-record messages.
         :param sync_mode: The synchronization mode.
         :param cursor: A Cursor object that maintains the state and the cursor field.
         """
-        self._stream = stream
+        self._stream_factory = stream_factory
         self.message_repository = message_repository
         self._sync_mode = SyncMode.full_refresh
         self._cursor = cursor
@@ -445,7 +445,7 @@ def generate(self) -> Iterable[Partition]:
             )
 
             yield StreamPartition(
-                self._stream,
+                self._stream_factory(),
                 copy.deepcopy(stream_slice),
                 self.message_repository,
                 self._sync_mode,

unit_tests/sources/streams/concurrent/test_adapters.py

@@ -448,7 +448,7 @@ def test_get_error_display_message(exception, expected_display_message):
 
 
 def test_cursor_partition_generator():
-    stream = Mock()
+    stream_factory = Mock()
     cursor = Mock()
     message_repository = Mock()
     connector_state_converter = CustomFormatConcurrentStreamStateConverter(
@@ -468,7 +468,7 @@ def test_cursor_partition_generator():
     ]
 
     partition_generator = CursorPartitionGenerator(
-        stream,
+        stream_factory,
         message_repository,
         cursor,
         connector_state_converter,