diff --git a/python/pipeline/operator.py b/python/pipeline/operator.py
index ddac492e1d383531b98ba0a3153893cbe0632722..9d4398fbc110f456ae5b364e97e4d35f0fdfa76b 100644
--- a/python/pipeline/operator.py
+++ b/python/pipeline/operator.py
@@ -575,7 +575,7 @@ class Op(object):
                 _LOGGER.debug("{} Stop.".format(op_info_prefix))
                 self._finalize(is_thread_op)
                 break
-            if len(parsed_data_dict) == 0:
+            if len(preped_data_dict) == 0:
                 continue
 
             # process
@@ -610,7 +610,7 @@ class Op(object):
             try:
                 for data_id, err_channeldata in err_channeldata_dict.items():
                     self._push_to_output_channels(
-                        data=error_channeldata,
+                        data=err_channeldata,
                         channels=output_channels,
                         client_need_profile=need_profile_dict[data_id],
                         profile_set=profile_dict[data_id])
diff --git a/python/pipeline/pipeline_server.py b/python/pipeline/pipeline_server.py
index 6ad34e343c6891a33e5cbd1728d0a65fd598d748..04d2c4fcb4c806aeb92d38ba589f6993cc836450 100644
--- a/python/pipeline/pipeline_server.py
+++ b/python/pipeline/pipeline_server.py
@@ -114,7 +114,9 @@ class PipelineServer(object):
                     worker.join()
         else:
             server = grpc.server(
-                futures.ThreadPoolExecutor(max_workers=self._worker_num))
+                futures.ThreadPoolExecutor(max_workers=self._worker_num),
+                options=[('grpc.max_send_message_length', 256 * 1024 * 1024),
+                    ('grpc.max_receive_message_length', 256 * 1024 * 1024)])
             pipeline_service_pb2_grpc.add_PipelineServiceServicer_to_server(
                 PipelineServicer(self._response_op, self._conf), server)
             server.add_insecure_port('[::]:{}'.format(self._port))
@@ -122,7 +124,9 @@ class PipelineServer(object):
             server.wait_for_termination()
 
     def _run_server_func(self, bind_address, response_op, dag_conf, worker_idx):
-        options = (('grpc.so_reuseport', 1), )
+        options = [('grpc.so_reuseport', 1),
+                ('grpc.max_send_message_length', 256 * 1024 * 1024),
+                ('grpc.max_send_message_length', 256 * 1024 * 1024)]
         server = grpc.server(
             futures.ThreadPoolExecutor(
                 max_workers=1, ), options=options)