fix: use keyed_window.keys for task lookup in accumulator task manager

packages/pynumaflow/pynumaflow/accumulator/_dtypes.py

@@ -17,9 +17,9 @@ class WindowOperation(IntEnum):
     Enumerate the type of Window operation received.
     """
 
-    OPEN = (0,)
-    CLOSE = (1,)
-    APPEND = (2,)
+    OPEN = 0
+    CLOSE = 1
+    APPEND = 2
 
 
 @dataclass(init=False, slots=True)

packages/pynumaflow/pynumaflow/accumulator/servicer/task_manager.py

@@ -14,6 +14,7 @@
     _AccumulatorBuilderClass,
     AccumulatorAsyncCallable,
     WindowOperation,
+    AccumulatorRequest,
 )
 from pynumaflow.proto.accumulator import accumulator_pb2
 from pynumaflow.shared.asynciter import NonBlockingIterator
@@ -93,7 +94,7 @@ async def stream_send_eof(self):
         for unified_key in task_keys:
             await self.tasks[unified_key].iterator.put(STREAM_EOF)
 
-    async def close_task(self, req):
+    async def close_task(self, req: AccumulatorRequest):
         """
         Closes a running accumulator task for a given key.
         Based on the request we compute the unique key, and then
@@ -104,8 +105,9 @@ async def close_task(self, req):
         3. Wait for all the results from the task to be written to the global result  queue
         4. Remove the task from the tracker
         """
-        d = req.payload
-        keys = d.keys
+        # Use keyed_window.keys for task lookup since payload.keys may be empty
+        # (e.g., CLOSE operations don't carry data, so payload.keys is not populated).
+        keys = req.keyed_window.keys
         unified_key = build_unique_key_name(keys)
         curr_task = self.tasks.get(unified_key, None)
 
@@ -120,14 +122,16 @@ async def close_task(self, req):
             # Put the exception in the result queue
             await self.global_result_queue.put(err)
 
-    async def create_task(self, req):
+    async def create_task(self, req: AccumulatorRequest):
         """
         Creates a new accumulator task for the given request.
         Based on the request we compute a unique key, and then
         it creates a new task or appends the request to the existing task.
         """
         d = req.payload
-        keys = d.keys
+        # Use keyed_window.keys for task lookup — the authoritative key identity
+        # for the window, consistent across all operation types (OPEN, APPEND, CLOSE).
+        keys = req.keyed_window.keys
         unified_key = build_unique_key_name(keys)
         curr_task = self.tasks.get(unified_key, None)
 
@@ -138,7 +142,7 @@ async def create_task(self, req):
             # Create a new result queue for the current task
             # We create a new result queue for each task, so that
             # the results of the accumulator operation can be sent to the
-            # the global result queue, which in turn sends the results
+            # global result queue, which in turn sends the results
             # to the client.
             res_queue = NonBlockingIterator()
 
@@ -172,13 +176,14 @@ async def create_task(self, req):
         # Put the request in the iterator
         await curr_task.iterator.put(d)
 
-    async def send_datum_to_task(self, req):
+    async def send_datum_to_task(self, req: AccumulatorRequest):
         """
         Appends the request to the existing window reduce task.
         If the task does not exist, create it.
         """
         d = req.payload
-        keys = d.keys
+        # Use keyed_window.keys for task lookup to match the key used in create_task/close_task.
+        keys = req.keyed_window.keys
         unified_key = build_unique_key_name(keys)
         result = self.tasks.get(unified_key, None)
         if not result:
@@ -215,9 +220,7 @@ async def __invoke_accumulator(
             # Put the exception in the result queue
             await self.global_result_queue.put(err)
 
-    async def process_input_stream(
-        self, request_iterator: AsyncIterable[accumulator_pb2.AccumulatorRequest]
-    ):
+    async def process_input_stream(self, request_iterator: AsyncIterable[AccumulatorRequest]):
         # Start iterating through the request iterator and create tasks
         # based on the operation type received.
         try:
@@ -226,15 +229,15 @@ async def process_input_stream(
                 request_count += 1
                 # check whether the request is an open, append, or close operation
                 match request.operation:
-                    case int(WindowOperation.OPEN):
+                    case WindowOperation.OPEN:
                         # create a new task for the open operation and
                         # put the request in the task iterator
                         await self.create_task(request)
-                    case int(WindowOperation.APPEND):
+                    case WindowOperation.APPEND:
                         # append the task data to the existing task
                         # if the task does not exist, create a new task
                         await self.send_datum_to_task(request)
-                    case int(WindowOperation.CLOSE):
+                    case WindowOperation.CLOSE:
                         # close the current task for req
                         await self.close_task(request)
                     case _:

packages/pynumaflow/tests/accumulator/test_async_accumulator.py

@@ -30,9 +30,11 @@
 def request_generator(count, request, resetkey: bool = False, send_close: bool = False):
     for i in range(count):
         if resetkey:
-            # Clear previous keys and add new ones
+            # Update keys on both payload and keyedWindow to match real platform behavior
             del request.payload.keys[:]
             request.payload.keys.extend([f"key-{i}"])
+            del request.operation.keyedWindow.keys[:]
+            request.operation.keyedWindow.keys.extend([f"key-{i}"])
 
         # Set operation based on index - first is OPEN, rest are APPEND
         if i == 0:
@@ -52,9 +54,11 @@ def request_generator(count, request, resetkey: bool = False, send_close: bool =
 def request_generator_append_only(count, request, resetkey: bool = False):
     for i in range(count):
         if resetkey:
-            # Clear previous keys and add new ones
+            # Update keys on both payload and keyedWindow to match real platform behavior
             del request.payload.keys[:]
             request.payload.keys.extend([f"key-{i}"])
+            del request.operation.keyedWindow.keys[:]
+            request.operation.keyedWindow.keys.extend([f"key-{i}"])
 
         # Set operation to APPEND for all requests
         request.operation.event = accumulator_pb2.AccumulatorRequest.WindowOperation.Event.APPEND
@@ -64,9 +68,11 @@ def request_generator_append_only(count, request, resetkey: bool = False):
 def request_generator_mixed(count, request, resetkey: bool = False):
     for i in range(count):
         if resetkey:
-            # Clear previous keys and add new ones
+            # Update keys on both payload and keyedWindow to match real platform behavior
             del request.payload.keys[:]
             request.payload.keys.extend([f"key-{i}"])
+            del request.operation.keyedWindow.keys[:]
+            request.operation.keyedWindow.keys.extend([f"key-{i}"])
 
         if i % 2 == 0:
             # Set operation to APPEND for even requests
@@ -107,17 +113,26 @@ def start_request() -> accumulator_pb2.AccumulatorRequest:
 
 def start_request_without_open() -> accumulator_pb2.AccumulatorRequest:
     event_time_timestamp, watermark_timestamp = get_time_args()
-
+    window = accumulator_pb2.KeyedWindow(
+        start=mock_interval_window_start(),
+        end=mock_interval_window_end(),
+        slot="slot-0",
+        keys=["test_key"],
+    )
     payload = accumulator_pb2.Payload(
         keys=["test_key"],
         value=mock_message(),
         event_time=event_time_timestamp,
         watermark=watermark_timestamp,
         id="test_id",
     )
-
+    operation = accumulator_pb2.AccumulatorRequest.WindowOperation(
+        event=accumulator_pb2.AccumulatorRequest.WindowOperation.Event.APPEND,
+        keyedWindow=window,
+    )
     request = accumulator_pb2.AccumulatorRequest(
         payload=payload,
+        operation=operation,
     )
     return request