diff --git a/core/general-client/src/general_model.cpp b/core/general-client/src/general_model.cpp
index 55a4b508b3f9c7a960bd09ff16355de65d2c4705..0270caf91441745ab02d460de8c6396462a3a3fe 100644
--- a/core/general-client/src/general_model.cpp
+++ b/core/general-client/src/general_model.cpp
@@ -108,7 +108,6 @@ void PredictorClient::set_predictor_conf(const std::string &conf_path,
   _predictor_path = conf_path;
   _predictor_conf = conf_file;
 }
-
 int PredictorClient::destroy_predictor() {
   _api.thrd_finalize();
   _api.destroy();
@@ -160,6 +159,7 @@ int PredictorClient::batch_predict(
   VLOG(2) << "fetch general model predictor done.";
   VLOG(2) << "float feed name size: " << float_feed_name.size();
   VLOG(2) << "int feed name size: " << int_feed_name.size();
+  VLOG(2) << "max body size : " << brpc::fLU64::FLAGS_max_body_size;
   Request req;
   for (auto &name : fetch_name) {
     req.add_fetch_var_names(name);
@@ -179,12 +179,16 @@ int PredictorClient::batch_predict(
       tensor_vec.push_back(inst->add_tensor_array());
     }
 
-    VLOG(2) << "batch [" << bi << "] int_feed_name and float_feed_name"
+    VLOG(2) << "batch [" << bi << "] int_feed_name and float_feed_name "
             << "prepared";
     int vec_idx = 0;
+    VLOG(2) << "tensor_vec size " << tensor_vec.size() << " float shape "
+            << float_shape.size();
     for (auto &name : float_feed_name) {
       int idx = _feed_name_to_idx[name];
       Tensor *tensor = tensor_vec[idx];
+      VLOG(2) << "prepare float feed " << name << " shape size "
+              << float_shape[vec_idx].size();
       for (int j = 0; j < float_shape[vec_idx].size(); ++j) {
         tensor->add_shape(float_shape[vec_idx][j]);
       }
@@ -202,6 +206,8 @@ int PredictorClient::batch_predict(
     for (auto &name : int_feed_name) {
       int idx = _feed_name_to_idx[name];
       Tensor *tensor = tensor_vec[idx];
+      VLOG(2) << "prepare int feed " << name << " shape size "
+              << int_shape[vec_idx].size();
       for (int j = 0; j < int_shape[vec_idx].size(); ++j) {
         tensor->add_shape(int_shape[vec_idx][j]);
       }
@@ -243,8 +249,11 @@ int PredictorClient::batch_predict(
     postprocess_start = client_infer_end;
 
     for (auto &name : fetch_name) {
-      int idx = _fetch_name_to_idx[name];
+      // int idx = _fetch_name_to_idx[name];
+      int idx = 0;
       int shape_size = res.insts(0).tensor_array(idx).shape_size();
+      VLOG(2) << "fetch var " << name << " index " << idx << " shape size "
+              << shape_size;
       predict_res_batch._shape_map[name].resize(shape_size);
       for (int i = 0; i < shape_size; ++i) {
         predict_res_batch._shape_map[name][i] =
@@ -258,11 +267,14 @@ int PredictorClient::batch_predict(
               res.insts(0).tensor_array(idx).lod(i);
         }
       }
+      idx += 1;
     }
 
     for (auto &name : fetch_name) {
-      int idx = _fetch_name_to_idx[name];
+      // int idx = _fetch_name_to_idx[name];
+      int idx = 0;
       if (_fetch_name_to_type[name] == 0) {
+        VLOG(2) << "ferch var " << name << "type int";
         predict_res_batch._int64_value_map[name].resize(
             res.insts(0).tensor_array(idx).int64_data_size());
         int size = res.insts(0).tensor_array(idx).int64_data_size();
@@ -271,6 +283,7 @@ int PredictorClient::batch_predict(
               res.insts(0).tensor_array(idx).int64_data(i);
         }
       } else {
+        VLOG(2) << "fetch var " << name << "type float";
         predict_res_batch._float_value_map[name].resize(
             res.insts(0).tensor_array(idx).float_data_size());
         int size = res.insts(0).tensor_array(idx).float_data_size();
@@ -279,6 +292,7 @@ int PredictorClient::batch_predict(
               res.insts(0).tensor_array(idx).float_data(i);
         }
       }
+      idx += 1;
     }
     postprocess_end = timeline.TimeStampUS();
   }
diff --git a/core/general-server/op/general_response_op.cpp b/core/general-server/op/general_response_op.cpp
index c4d4c253983e0efe4dd75486d052e3e46fe489fe..b84cb199001a864ba55de7fe278262c650e98c22 100644
--- a/core/general-server/op/general_response_op.cpp
+++ b/core/general-server/op/general_response_op.cpp
@@ -64,6 +64,8 @@ int GeneralResponseOp::inference() {
   std::shared_ptr<PaddleGeneralModelConfig> model_config =
       resource.get_general_model_config();
 
+  VLOG(2) << "max body size : " << brpc::fLU64::FLAGS_max_body_size;
+
   std::vector<int> fetch_index;
   fetch_index.resize(req->fetch_var_names_size());
   for (int i = 0; i < req->fetch_var_names_size(); ++i) {
diff --git a/python/paddle_serving_client/__init__.py b/python/paddle_serving_client/__init__.py
index 91a5929916474387338def342e4839f7fd817cb5..98d233f059a1ad0b588bce5bf3ef831d783c3a44 100644
--- a/python/paddle_serving_client/__init__.py
+++ b/python/paddle_serving_client/__init__.py
@@ -111,7 +111,9 @@ class Client(object):
         self.result_handle_ = PredictorRes()
         self.client_handle_ = PredictorClient()
         self.client_handle_.init(path)
-        read_env_flags = ["profile_client", "profile_server"]
+        if "FLAGS_max_body_size" not in os.environ:
+            os.environ["FLAGS_max_body_size"] = str(512 * 1024 * 1024)
+        read_env_flags = ["profile_client", "profile_server", "max_body_size"]
         self.client_handle_.init_gflags([sys.argv[
             0]] + ["--tryfromenv=" + ",".join(read_env_flags)])
         self.feed_names_ = [var.alias_name for var in model_conf.feed_var]
@@ -223,8 +225,6 @@ class Client(object):
         for i, feed_i in enumerate(feed_batch):
             int_slot = []
             float_slot = []
-            int_shape = []
-            float_shape = []
             for key in feed_i:
                 if key not in self.feed_names_:
                     raise ValueError("Wrong feed name: {}.".format(key))
diff --git a/python/paddle_serving_server/__init__.py b/python/paddle_serving_server/__init__.py
index 08f3febc14ecd0d3c3cde7dc54f17bd143f9d5b3..6da0e6597e69d605b7172139d32c00b77d538386 100644
--- a/python/paddle_serving_server/__init__.py
+++ b/python/paddle_serving_server/__init__.py
@@ -89,6 +89,7 @@ class Server(object):
         self.num_threads = 4
         self.port = 8080
         self.reload_interval_s = 10
+        self.max_body_size = 64 * 1024 * 1024
         self.module_path = os.path.dirname(paddle_serving_server.__file__)
         self.cur_path = os.getcwd()
         self.use_local_bin = False
@@ -100,6 +101,14 @@ class Server(object):
     def set_num_threads(self, threads):
         self.num_threads = threads
 
+    def set_max_body_size(self, body_size):
+        if body_size >= self.max_body_size:
+            self.max_body_size = body_size
+        else:
+            print(
+                "max_body_size is less than default value, will use default value in service."
+            )
+
     def set_port(self, port):
         self.port = port
 
@@ -292,7 +301,8 @@ class Server(object):
                   "-resource_file {} " \
                   "-workflow_path {} " \
                   "-workflow_file {} " \
-                  "-bthread_concurrency {} ".format(
+                  "-bthread_concurrency {} " \
+                  "-max_body_size {} ".format(
                       self.bin_path,
                       self.workdir,
                       self.infer_service_fn,
@@ -304,7 +314,8 @@ class Server(object):
                       self.resource_fn,
                       self.workdir,
                       self.workflow_fn,
-                      self.num_threads)
+                      self.num_threads,
+                      self.max_body_size)
         print("Going to Run Command")
         print(command)
         os.system(command)
diff --git a/python/paddle_serving_server/monitor.py b/python/paddle_serving_server/monitor.py
index 11fe393bc07c4cff0a1c9667a05cc5c598f06608..3f1ff6436917b8ae7ff4ea06fcae1f55bd65e887 100644
--- a/python/paddle_serving_server/monitor.py
+++ b/python/paddle_serving_server/monitor.py
@@ -91,6 +91,7 @@ class Monitor(object):
                 model_name))
             return model_name
         tar_model_path = os.path.join(local_tmp_path, model_name)
+        _LOGGER.info("try to unpack remote file({})".format(tar_model_path))
         if not tarfile.is_tarfile(tar_model_path):
             raise Exception('not a tar packaged file type. {}'.format(
                 self._check_param_help('remote_model_name', model_name)))
@@ -105,10 +106,11 @@ class Monitor(object):
                     self._check_param_help('local_tmp_path', local_tmp_path)))
         finally:
             os.remove(tar_model_path)
-            _LOGGER.debug('remove packed file({}).'.format(model_name))
+            _LOGGER.debug('remove packed file({}).'.format(tar_model_path))
             _LOGGER.info('using unpacked filename: {}.'.format(
                 unpacked_filename))
-            if not os.path.exists(unpacked_filename):
+            if not os.path.exists(
+                    os.path.join(local_tmp_path, unpacked_filename)):
                 raise Exception('file not exist. {}'.format(
                     self._check_param_help('unpacked_filename',
                                            unpacked_filename)))
@@ -124,13 +126,14 @@ class Monitor(object):
             '_local_tmp_path', '_interval'
         ]
         self._print_params(params)
-        if not os.path.exists(self._local_tmp_path):
-            _LOGGER.info('mkdir: {}'.format(self._local_tmp_path))
-            os.makedirs(self._local_tmp_path)
+        local_tmp_path = os.path.join(self._local_path, self._local_tmp_path)
+        _LOGGER.info('local_tmp_path: {}'.format(local_tmp_path))
+        if not os.path.exists(local_tmp_path):
+            _LOGGER.info('mkdir: {}'.format(local_tmp_path))
+            os.makedirs(local_tmp_path)
         while True:
             [flag, timestamp] = self._exist_remote_file(
-                self._remote_path, self._remote_donefile_name,
-                self._local_tmp_path)
+                self._remote_path, self._remote_donefile_name, local_tmp_path)
             if flag:
                 if self._remote_donefile_timestamp is None or \
                         timestamp != self._remote_donefile_timestamp:
@@ -139,15 +142,15 @@ class Monitor(object):
                     self._remote_donefile_timestamp = timestamp
                     self._pull_remote_dir(self._remote_path,
                                           self._remote_model_name,
-                                          self._local_tmp_path)
+                                          local_tmp_path)
                     _LOGGER.info('pull remote model({}).'.format(
                         self._remote_model_name))
                     unpacked_filename = self._decompress_model_file(
-                        self._local_tmp_path, self._remote_model_name,
+                        local_tmp_path, self._remote_model_name,
                         self._unpacked_filename)
-                    self._update_local_model(
-                        self._local_tmp_path, unpacked_filename,
-                        self._local_path, self._local_model_name)
+                    self._update_local_model(local_tmp_path, unpacked_filename,
+                                             self._local_path,
+                                             self._local_model_name)
                     _LOGGER.info('update local model({}).'.format(
                         self._local_model_name))
                     self._update_local_donefile(self._local_path,
@@ -220,7 +223,12 @@ class HadoopMonitor(Monitor):
         local_dirpath = os.path.join(local_tmp_path, dirname)
         if os.path.exists(local_dirpath):
             _LOGGER.info('remove old temporary model file({}).'.format(dirname))
-            shutil.rmtree(local_dirpath)
+            if self._unpacked_filename is None:
+                # the remote file is model folder.
+                shutil.rmtree(local_dirpath)
+            else:
+                # the remote file is a packed model file
+                os.remove(local_dirpath)
         remote_dirpath = os.path.join(remote_path, dirname)
         cmd = '{} -get {} {} 2>/dev/null'.format(self._cmd_prefix,
                                                  remote_dirpath, local_dirpath)
@@ -301,8 +309,8 @@ class FTPMonitor(Monitor):
                         os.path.join(remote_path, remote_dirname), name,
                         os.path.join(local_tmp_path, remote_dirname), overwrite)
                 else:
-                    self._download_remote_file(remote_dirname, name,
-                                               local_tmp_path, overwrite)
+                    self._download_remote_file(remote_dirpath, name,
+                                               local_dirpath, overwrite)
         except ftplib.error_perm:
             _LOGGER.debug('{} is file.'.format(remote_dirname))
             self._download_remote_file(remote_path, remote_dirname,
@@ -325,17 +333,17 @@ class GeneralMonitor(Monitor):
     def _get_local_file_timestamp(self, filename):
         return os.path.getmtime(filename)
 
-    def _exist_remote_file(self, path, filename, local_tmp_path):
-        remote_filepath = os.path.join(path, filename)
+    def _exist_remote_file(self, remote_path, filename, local_tmp_path):
+        remote_filepath = os.path.join(remote_path, filename)
         url = '{}/{}'.format(self._general_host, remote_filepath)
         _LOGGER.debug('remote file url: {}'.format(url))
-        cmd = 'wget -N -P {} {} &>/dev/null'.format(local_tmp_path, url)
+        # only for check donefile, which is not a folder.
+        cmd = 'wget -nd -N -P {} {} &>/dev/null'.format(local_tmp_path, url)
         _LOGGER.debug('wget cmd: {}'.format(cmd))
         if os.system(cmd) != 0:
-            _LOGGER.debug('remote file({}) not exist.'.format(filename))
+            _LOGGER.debug('remote file({}) not exist.'.format(remote_filepath))
             return [False, None]
         else:
-            _LOGGER.debug('download remote file({}).'.format(filename))
             timestamp = self._get_local_file_timestamp(
                 os.path.join(local_tmp_path, filename))
             return [True, timestamp]
@@ -344,7 +352,13 @@ class GeneralMonitor(Monitor):
         remote_dirpath = os.path.join(remote_path, dirname)
         url = '{}/{}'.format(self._general_host, remote_dirpath)
         _LOGGER.debug('remote file url: {}'.format(url))
-        cmd = 'wget -nH -r -P {} {} &>/dev/null'.format(local_tmp_path, url)
+        if self._unpacked_filename is None:
+            # the remote file is model folder.
+            cmd = 'wget -nH -r -P {} {} &>/dev/null'.format(
+                os.path.join(local_tmp_path, dirname), url)
+        else:
+            # the remote file is a packed model file
+            cmd = 'wget -nd -N -P {} {} &>/dev/null'.format(local_tmp_path, url)
         _LOGGER.debug('wget cmd: {}'.format(cmd))
         if os.system(cmd) != 0:
             raise Exception('pull remote dir failed. {}'.format(
@@ -352,7 +366,11 @@ class GeneralMonitor(Monitor):
 
 
 def parse_args():
-    ''' parse args. '''
+    """ parse args.
+
+    Returns:
+        parser.parse_args().
+    """
     parser = argparse.ArgumentParser(description="Monitor")
     parser.add_argument(
         "--type", type=str, default='general', help="Type of remote server")
diff --git a/python/paddle_serving_server/serve.py b/python/paddle_serving_server/serve.py
index b57d2253dbe1f14caff50eb79543f224b8d0ec45..396ed17c2074923003515b26352e87fc8309a252 100644
--- a/python/paddle_serving_server/serve.py
+++ b/python/paddle_serving_server/serve.py
@@ -41,6 +41,11 @@ def parse_args():  # pylint: disable=doc-string-missing
         "--device", type=str, default="cpu", help="Type of device")
     parser.add_argument(
         "--mem_optim", type=bool, default=False, help="Memory optimize")
+    parser.add_argument(
+        "--max_body_size",
+        type=int,
+        default=512 * 1024 * 1024,
+        help="Limit sizes of messages")
     return parser.parse_args()
 
 
@@ -52,6 +57,7 @@ def start_standard_model():  # pylint: disable=doc-string-missing
     workdir = args.workdir
     device = args.device
     mem_optim = args.mem_optim
+    max_body_size = args.max_body_size
 
     if model == "":
         print("You must specify your serving model")
@@ -72,6 +78,7 @@ def start_standard_model():  # pylint: disable=doc-string-missing
     server.set_op_sequence(op_seq_maker.get_op_sequence())
     server.set_num_threads(thread_num)
     server.set_memory_optimize(mem_optim)
+    server.set_max_body_size(max_body_size)
 
     server.load_model_config(model)
     server.prepare_server(workdir=workdir, port=port, device=device)
diff --git a/python/paddle_serving_server_gpu/__init__.py b/python/paddle_serving_server_gpu/__init__.py
index d4984c39df866dcca45daa45d9fc15feaaba8635..0e5a49c4870956557c99fdf8abf08edf47bc4aa6 100644
--- a/python/paddle_serving_server_gpu/__init__.py
+++ b/python/paddle_serving_server_gpu/__init__.py
@@ -46,6 +46,11 @@ def serve_args():
         "--name", type=str, default="None", help="Default service name")
     parser.add_argument(
         "--mem_optim", type=bool, default=False, help="Memory optimize")
+    parser.add_argument(
+        "--max_body_size",
+        type=int,
+        default=512 * 1024 * 1024,
+        help="Limit sizes of messages")
     return parser.parse_args()
 
 
@@ -114,6 +119,7 @@ class Server(object):
         self.num_threads = 4
         self.port = 8080
         self.reload_interval_s = 10
+        self.max_body_size = 64 * 1024 * 1024
         self.module_path = os.path.dirname(paddle_serving_server.__file__)
         self.cur_path = os.getcwd()
         self.check_cuda()
@@ -126,6 +132,14 @@ class Server(object):
     def set_num_threads(self, threads):
         self.num_threads = threads
 
+    def set_max_body_size(self, body_size):
+        if body_size >= self.max_body_size:
+            self.max_body_size = body_size
+        else:
+            print(
+                "max_body_size is less than default value, will use default value in service."
+            )
+
     def set_port(self, port):
         self.port = port
 
@@ -324,7 +338,8 @@ class Server(object):
                   "-workflow_path {} " \
                   "-workflow_file {} " \
                   "-bthread_concurrency {} " \
-                  "-gpuid {} ".format(
+                  "-gpuid {} " \
+                  "-max_body_size {} ".format(
                       self.bin_path,
                       self.workdir,
                       self.infer_service_fn,
@@ -337,7 +352,8 @@ class Server(object):
                       self.workdir,
                       self.workflow_fn,
                       self.num_threads,
-                      self.gpuid,)
+                      self.gpuid,
+                      self.max_body_size)
         print("Going to Run Comand")
         print(command)
 
diff --git a/python/paddle_serving_server_gpu/monitor.py b/python/paddle_serving_server_gpu/monitor.py
new file mode 100644
index 0000000000000000000000000000000000000000..3f1ff6436917b8ae7ff4ea06fcae1f55bd65e887
--- /dev/null
+++ b/python/paddle_serving_server_gpu/monitor.py
@@ -0,0 +1,504 @@
+# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""
+Usage:
+    Start monitor with one line command
+    Example:
+        python -m paddle_serving_server.monitor
+"""
+import os
+import time
+import argparse
+import commands
+import datetime
+import shutil
+import tarfile
+import logging
+
+_LOGGER = logging.getLogger(__name__)
+
+
+class Monitor(object):
+    '''
+    Monitor base class. It is used to monitor the remote model, pull and update the local model.
+    '''
+
+    def __init__(self, interval):
+        self._remote_path = None
+        self._remote_model_name = None
+        self._remote_donefile_name = None
+        self._local_path = None
+        self._local_model_name = None
+        self._local_timestamp_file = None
+        self._interval = interval
+        self._remote_donefile_timestamp = None
+        self._local_tmp_path = None
+        self._unpacked_filename = None
+
+    def set_remote_path(self, remote_path):
+        self._remote_path = remote_path
+
+    def set_remote_model_name(self, model_name):
+        self._remote_model_name = model_name
+
+    def set_remote_donefile_name(self, donefile_name):
+        self._remote_donefile_name = donefile_name
+
+    def set_local_path(self, local_path):
+        self._local_path = local_path
+
+    def set_local_model_name(self, model_name):
+        self._local_model_name = model_name
+
+    def set_local_timestamp_file(self, timestamp_file):
+        self._local_timestamp_file = timestamp_file
+
+    def set_local_tmp_path(self, tmp_path):
+        self._local_tmp_path = tmp_path
+
+    def set_unpacked_filename(self, unpacked_filename):
+        self._unpacked_filename = unpacked_filename
+
+    def _check_param_help(self, param_name, param_value):
+        return "Please check the {}({}) parameter.".format(param_name,
+                                                           param_value)
+
+    def _check_params(self, params):
+        for param in params:
+            if getattr(self, param, None) is None:
+                raise Exception('{} not set.'.format(param))
+
+    def _print_params(self, params_name):
+        self._check_params(params_name)
+        for name in params_name:
+            _LOGGER.info('{}: {}'.format(name, getattr(self, name)))
+
+    def _decompress_model_file(self, local_tmp_path, model_name,
+                               unpacked_filename):
+        if unpacked_filename is None:
+            _LOGGER.debug('remote file({}) is already unpacked.'.format(
+                model_name))
+            return model_name
+        tar_model_path = os.path.join(local_tmp_path, model_name)
+        _LOGGER.info("try to unpack remote file({})".format(tar_model_path))
+        if not tarfile.is_tarfile(tar_model_path):
+            raise Exception('not a tar packaged file type. {}'.format(
+                self._check_param_help('remote_model_name', model_name)))
+        try:
+            _LOGGER.info('unpack remote file({}).'.format(model_name))
+            tar = tarfile.open(tar_model_path)
+            tar.extractall(local_tmp_path)
+            tar.close()
+        except:
+            raise Exception(
+                'Decompressing failed, maybe no disk space left. {}'.foemat(
+                    self._check_param_help('local_tmp_path', local_tmp_path)))
+        finally:
+            os.remove(tar_model_path)
+            _LOGGER.debug('remove packed file({}).'.format(tar_model_path))
+            _LOGGER.info('using unpacked filename: {}.'.format(
+                unpacked_filename))
+            if not os.path.exists(
+                    os.path.join(local_tmp_path, unpacked_filename)):
+                raise Exception('file not exist. {}'.format(
+                    self._check_param_help('unpacked_filename',
+                                           unpacked_filename)))
+            return unpacked_filename
+
+    def run(self):
+        '''
+        Monitor the remote model by polling and update the local model.
+        '''
+        params = [
+            '_remote_path', '_remote_model_name', '_remote_donefile_name',
+            '_local_model_name', '_local_path', '_local_timestamp_file',
+            '_local_tmp_path', '_interval'
+        ]
+        self._print_params(params)
+        local_tmp_path = os.path.join(self._local_path, self._local_tmp_path)
+        _LOGGER.info('local_tmp_path: {}'.format(local_tmp_path))
+        if not os.path.exists(local_tmp_path):
+            _LOGGER.info('mkdir: {}'.format(local_tmp_path))
+            os.makedirs(local_tmp_path)
+        while True:
+            [flag, timestamp] = self._exist_remote_file(
+                self._remote_path, self._remote_donefile_name, local_tmp_path)
+            if flag:
+                if self._remote_donefile_timestamp is None or \
+                        timestamp != self._remote_donefile_timestamp:
+                    _LOGGER.info('doneilfe({}) changed.'.format(
+                        self._remote_donefile_name))
+                    self._remote_donefile_timestamp = timestamp
+                    self._pull_remote_dir(self._remote_path,
+                                          self._remote_model_name,
+                                          local_tmp_path)
+                    _LOGGER.info('pull remote model({}).'.format(
+                        self._remote_model_name))
+                    unpacked_filename = self._decompress_model_file(
+                        local_tmp_path, self._remote_model_name,
+                        self._unpacked_filename)
+                    self._update_local_model(local_tmp_path, unpacked_filename,
+                                             self._local_path,
+                                             self._local_model_name)
+                    _LOGGER.info('update local model({}).'.format(
+                        self._local_model_name))
+                    self._update_local_donefile(self._local_path,
+                                                self._local_model_name,
+                                                self._local_timestamp_file)
+                    _LOGGER.info('update model timestamp({}).'.format(
+                        self._local_timestamp_file))
+            else:
+                _LOGGER.info('remote({}) has no donefile.'.format(
+                    self._remote_path))
+            _LOGGER.info('sleep {}s.'.format(self._interval))
+            time.sleep(self._interval)
+
+    def _exist_remote_file(self, path, filename, local_tmp_path):
+        raise Exception('This function must be inherited.')
+
+    def _pull_remote_dir(self, remote_path, dirname, local_tmp_path):
+        raise Exception('This function must be inherited.')
+
+    def _update_local_model(self, local_tmp_path, remote_model_name, local_path,
+                            local_model_name):
+        tmp_model_path = os.path.join(local_tmp_path, remote_model_name)
+        local_model_path = os.path.join(local_path, local_model_name)
+        cmd = 'cp -r {}/* {}'.format(tmp_model_path, local_model_path)
+        _LOGGER.debug('update model cmd: {}'.format(cmd))
+        if os.system(cmd) != 0:
+            raise Exception('update local model failed.')
+
+    def _update_local_donefile(self, local_path, local_model_name,
+                               local_timestamp_file):
+        donefile_path = os.path.join(local_path, local_model_name,
+                                     local_timestamp_file)
+        cmd = 'touch {}'.format(donefile_path)
+        _LOGGER.debug('update timestamp cmd: {}'.format(cmd))
+        if os.system(cmd) != 0:
+            raise Exception('update local donefile failed.')
+
+
+class HadoopMonitor(Monitor):
+    ''' Monitor HDFS or AFS by Hadoop-client. '''
+
+    def __init__(self, hadoop_bin, fs_name='', fs_ugi='', interval=10):
+        super(HadoopMonitor, self).__init__(interval)
+        self._hadoop_bin = hadoop_bin
+        self._fs_name = fs_name
+        self._fs_ugi = fs_ugi
+        self._print_params(['_hadoop_bin', '_fs_name', '_fs_ugi'])
+        self._cmd_prefix = '{} fs '.format(self._hadoop_bin)
+        if self._fs_name:
+            self._cmd_prefix += '-D fs.default.name={} '.format(self._fs_name)
+        if self._fs_ugi:
+            self._cmd_prefix += '-D hadoop.job.ugi={} '.format(self._fs_ugi)
+        _LOGGER.info('Hadoop prefix cmd: {}'.format(self._cmd_prefix))
+
+    def _exist_remote_file(self, path, filename, local_tmp_path):
+        remote_filepath = os.path.join(path, filename)
+        cmd = '{} -ls {} 2>/dev/null'.format(self._cmd_prefix, remote_filepath)
+        _LOGGER.debug('check cmd: {}'.format(cmd))
+        [status, output] = commands.getstatusoutput(cmd)
+        _LOGGER.debug('resp: {}'.format(output))
+        if status == 0:
+            [_, _, _, _, _, mdate, mtime, _] = output.split('\n')[-1].split()
+            timestr = mdate + mtime
+            return [True, timestr]
+        else:
+            return [False, None]
+
+    def _pull_remote_dir(self, remote_path, dirname, local_tmp_path):
+        # remove old file before pull remote dir
+        local_dirpath = os.path.join(local_tmp_path, dirname)
+        if os.path.exists(local_dirpath):
+            _LOGGER.info('remove old temporary model file({}).'.format(dirname))
+            if self._unpacked_filename is None:
+                # the remote file is model folder.
+                shutil.rmtree(local_dirpath)
+            else:
+                # the remote file is a packed model file
+                os.remove(local_dirpath)
+        remote_dirpath = os.path.join(remote_path, dirname)
+        cmd = '{} -get {} {} 2>/dev/null'.format(self._cmd_prefix,
+                                                 remote_dirpath, local_dirpath)
+        _LOGGER.debug('pull cmd: {}'.format(cmd))
+        if os.system(cmd) != 0:
+            raise Exception('pull remote dir failed. {}'.format(
+                self._check_param_help('remote_model_name', dirname)))
+
+
+class FTPMonitor(Monitor):
+    ''' FTP Monitor. '''
+
+    def __init__(self, host, port, username="", password="", interval=10):
+        super(FTPMonitor, self).__init__(interval)
+        import ftplib
+        self._ftp = ftplib.FTP()
+        self._ftp_host = host
+        self._ftp_port = port
+        self._ftp_username = username
+        self._ftp_password = password
+        self._ftp.connect(self._ftp_host, self._ftp_port)
+        self._ftp.login(self._ftp_username, self._ftp_password)
+        self._print_params(
+            ['_ftp_host', '_ftp_port', '_ftp_username', '_ftp_password'])
+
+    def _exist_remote_file(self, path, filename, local_tmp_path):
+        import ftplib
+        try:
+            _LOGGER.debug('cwd: {}'.format(path))
+            self._ftp.cwd(path)
+            timestamp = self._ftp.voidcmd('MDTM {}'.format(filename))[4:].strip(
+            )
+            return [True, timestamp]
+        except ftplib.error_perm:
+            _LOGGER.debug('remote file({}) not exist.'.format(filename))
+            return [False, None]
+
+    def _download_remote_file(self,
+                              remote_path,
+                              remote_filename,
+                              local_tmp_path,
+                              overwrite=True):
+        local_fullpath = os.path.join(local_tmp_path, remote_filename)
+        if not overwrite and os.path.isfile(fullpath):
+            return
+        else:
+            with open(local_fullpath, 'wb') as f:
+                _LOGGER.debug('cwd: {}'.format(remote_path))
+                self._ftp.cwd(remote_path)
+                _LOGGER.debug('download remote file({})'.format(
+                    remote_filename))
+                self._ftp.retrbinary('RETR {}'.format(remote_filename), f.write)
+
+    def _download_remote_files(self,
+                               remote_path,
+                               remote_dirname,
+                               local_tmp_path,
+                               overwrite=True):
+        import ftplib
+        remote_dirpath = os.path.join(remote_path, remote_dirname)
+        # Check whether remote_dirpath is a file or a folder
+        try:
+            _LOGGER.debug('cwd: {}'.format(remote_dirpath))
+            self._ftp.cwd(remote_dirpath)
+            _LOGGER.debug('{} is folder.'.format(remote_dirname))
+
+            local_dirpath = os.path.join(local_tmp_path, remote_dirname)
+            if not os.path.exists(local_dirpath):
+                _LOGGER.info('mkdir: {}'.format(local_dirpath))
+                os.mkdir(local_dirpath)
+
+            output = []
+            self._ftp.dir(output.append)
+            for line in output:
+                [attr, _, _, _, _, _, _, _, name] = line.split()
+                if attr[0] == 'd':
+                    self._download_remote_files(
+                        os.path.join(remote_path, remote_dirname), name,
+                        os.path.join(local_tmp_path, remote_dirname), overwrite)
+                else:
+                    self._download_remote_file(remote_dirpath, name,
+                                               local_dirpath, overwrite)
+        except ftplib.error_perm:
+            _LOGGER.debug('{} is file.'.format(remote_dirname))
+            self._download_remote_file(remote_path, remote_dirname,
+                                       local_tmp_path, overwrite)
+            return
+
+    def _pull_remote_dir(self, remote_path, dirname, local_tmp_path):
+        self._download_remote_files(
+            remote_path, dirname, local_tmp_path, overwrite=True)
+
+
+class GeneralMonitor(Monitor):
+    ''' General Monitor. '''
+
+    def __init__(self, host, interval=10):
+        super(GeneralMonitor, self).__init__(interval)
+        self._general_host = host
+        self._print_params(['_general_host'])
+
+    def _get_local_file_timestamp(self, filename):
+        return os.path.getmtime(filename)
+
+    def _exist_remote_file(self, remote_path, filename, local_tmp_path):
+        remote_filepath = os.path.join(remote_path, filename)
+        url = '{}/{}'.format(self._general_host, remote_filepath)
+        _LOGGER.debug('remote file url: {}'.format(url))
+        # only for check donefile, which is not a folder.
+        cmd = 'wget -nd -N -P {} {} &>/dev/null'.format(local_tmp_path, url)
+        _LOGGER.debug('wget cmd: {}'.format(cmd))
+        if os.system(cmd) != 0:
+            _LOGGER.debug('remote file({}) not exist.'.format(remote_filepath))
+            return [False, None]
+        else:
+            timestamp = self._get_local_file_timestamp(
+                os.path.join(local_tmp_path, filename))
+            return [True, timestamp]
+
+    def _pull_remote_dir(self, remote_path, dirname, local_tmp_path):
+        remote_dirpath = os.path.join(remote_path, dirname)
+        url = '{}/{}'.format(self._general_host, remote_dirpath)
+        _LOGGER.debug('remote file url: {}'.format(url))
+        if self._unpacked_filename is None:
+            # the remote file is model folder.
+            cmd = 'wget -nH -r -P {} {} &>/dev/null'.format(
+                os.path.join(local_tmp_path, dirname), url)
+        else:
+            # the remote file is a packed model file
+            cmd = 'wget -nd -N -P {} {} &>/dev/null'.format(local_tmp_path, url)
+        _LOGGER.debug('wget cmd: {}'.format(cmd))
+        if os.system(cmd) != 0:
+            raise Exception('pull remote dir failed. {}'.format(
+                self._check_param_help('remote_model_name', dirname)))
+
+
+def parse_args():
+    """ parse args.
+
+    Returns:
+        parser.parse_args().
+    """
+    parser = argparse.ArgumentParser(description="Monitor")
+    parser.add_argument(
+        "--type", type=str, default='general', help="Type of remote server")
+    parser.add_argument(
+        "--remote_path",
+        type=str,
+        required=True,
+        help="The base path for the remote")
+    parser.add_argument(
+        "--remote_model_name",
+        type=str,
+        required=True,
+        help="The model name to be pulled from the remote")
+    parser.add_argument(
+        "--remote_donefile_name",
+        type=str,
+        required=True,
+        help="The donefile name that marks the completion of the remote model update"
+    )
+    parser.add_argument(
+        "--local_path", type=str, required=True, help="Local work path")
+    parser.add_argument(
+        "--local_model_name", type=str, required=True, help="Local model name")
+    parser.add_argument(
+        "--local_timestamp_file",
+        type=str,
+        default='fluid_time_file',
+        help="The timestamp file used locally for hot loading, The file is considered to be placed in the `local_path/local_model_name` folder."
+    )
+    parser.add_argument(
+        "--local_tmp_path",
+        type=str,
+        default='_serving_monitor_tmp',
+        help="The path of the folder where temporary files are stored locally. If it does not exist, it will be created automatically"
+    )
+    parser.add_argument(
+        "--unpacked_filename",
+        type=str,
+        default=None,
+        help="If the model of the remote production is a packaged file, the unpacked file name should be set. Currently, only tar packaging format is supported."
+    )
+    parser.add_argument(
+        "--interval",
+        type=int,
+        default=10,
+        help="The polling interval in seconds")
+    parser.add_argument(
+        "--debug", action='store_true', help="If set, output more details")
+    parser.set_defaults(debug=False)
+    # general monitor
+    parser.add_argument("--general_host", type=str, help="General remote host")
+    # ftp monitor
+    parser.add_argument("--ftp_host", type=str, help="FTP remote host")
+    parser.add_argument("--ftp_port", type=int, help="FTP remote port")
+    parser.add_argument(
+        "--ftp_username",
+        type=str,
+        default='',
+        help="FTP username. Not used if anonymous access.")
+    parser.add_argument(
+        "--ftp_password",
+        type=str,
+        default='',
+        help="FTP password. Not used if anonymous access")
+    # afs/hdfs monitor
+    parser.add_argument(
+        "--hadoop_bin", type=str, help="Path of Hadoop binary file")
+    parser.add_argument(
+        "--fs_name",
+        type=str,
+        default='',
+        help="AFS/HDFS fs_name. Not used if set in Hadoop-client.")
+    parser.add_argument(
+        "--fs_ugi",
+        type=str,
+        default='',
+        help="AFS/HDFS fs_ugi, Not used if set in Hadoop-client")
+    return parser.parse_args()
+
+
+def get_monitor(mtype):
+    """ generator monitor instance.
+
+    Args:
+        mtype: type of monitor
+
+    Returns:
+        monitor instance.
+    """
+    if mtype == 'ftp':
+        return FTPMonitor(
+            args.ftp_host,
+            args.ftp_port,
+            username=args.ftp_username,
+            password=args.ftp_password,
+            interval=args.interval)
+    elif mtype == 'general':
+        return GeneralMonitor(args.general_host, interval=args.interval)
+    elif mtype == 'afs' or mtype == 'hdfs':
+        return HadoopMonitor(
+            args.hadoop_bin, args.fs_name, args.fs_ugi, interval=args.interval)
+    else:
+        raise Exception('unsupport type.')
+
+
+def start_monitor(monitor, args):
+    monitor.set_remote_path(args.remote_path)
+    monitor.set_remote_model_name(args.remote_model_name)
+    monitor.set_remote_donefile_name(args.remote_donefile_name)
+    monitor.set_local_path(args.local_path)
+    monitor.set_local_model_name(args.local_model_name)
+    monitor.set_local_timestamp_file(args.local_timestamp_file)
+    monitor.set_local_tmp_path(args.local_tmp_path)
+    monitor.set_unpacked_filename(args.unpacked_filename)
+    monitor.run()
+
+
+if __name__ == "__main__":
+    args = parse_args()
+    if args.debug:
+        logging.basicConfig(
+            format='%(asctime)s %(levelname)-8s [%(filename)s:%(lineno)d] %(message)s',
+            datefmt='%Y-%m-%d %H:%M',
+            level=logging.DEBUG)
+    else:
+        logging.basicConfig(
+            format='%(asctime)s %(levelname)-8s [%(filename)s:%(lineno)d] %(message)s',
+            datefmt='%Y-%m-%d %H:%M',
+            level=logging.INFO)
+    monitor = get_monitor(args.type)
+    start_monitor(monitor, args)
diff --git a/python/paddle_serving_server_gpu/serve.py b/python/paddle_serving_server_gpu/serve.py
index 916af05ab6c6741b6504ce8f7660f6c7648c50f2..512b5ec0a7d15a030afdcaa5e8daa344b29fb96e 100644
--- a/python/paddle_serving_server_gpu/serve.py
+++ b/python/paddle_serving_server_gpu/serve.py
@@ -35,6 +35,7 @@ def start_gpu_card_model(index, gpuid, args):  # pylint: disable=doc-string-miss
     thread_num = args.thread
     model = args.model
     mem_optim = args.mem_optim
+    max_body_size = args.max_body_size
     workdir = "{}_{}".format(args.workdir, gpuid)
 
     if model == "":
@@ -56,6 +57,7 @@ def start_gpu_card_model(index, gpuid, args):  # pylint: disable=doc-string-miss
     server.set_op_sequence(op_seq_maker.get_op_sequence())
     server.set_num_threads(thread_num)
     server.set_memory_optimize(mem_optim)
+    server.set_max_body_size(max_body_size)
 
     server.load_model_config(model)
     server.prepare_server(workdir=workdir, port=port, device=device)