diff --git a/shards/mishards/connections.py b/shards/mishards/connections.py
index d13987c70b6be6248b5b4c746899eacfdcd714bc..fa9c52eddcf62324d55888ebcc4961a965ba4958 100644
--- a/shards/mishards/connections.py
+++ b/shards/mishards/connections.py
@@ -1,7 +1,10 @@
+import time
+import enum
+import json
 import logging
 import threading
-import enum
 from functools import wraps
+from collections import defaultdict
 from milvus import Milvus
 from milvus.client.hooks import BaseSearchHook
 
@@ -89,6 +92,26 @@ class Connection:
         return self.__str__()
 
 
+class Duration:
+    def __init__(self):
+        self.start_ts = time.time()
+        self.end_ts = None
+
+    def stop(self):
+        if self.end_ts:
+            return False
+
+        self.end_ts = time.time()
+        return True
+
+    @property
+    def value(self):
+        if not self.end_ts:
+            return None
+
+        return self.end_ts - self.start_ts
+
+
 class ProxyMixin:
     def __getattr__(self, name):
         target = self.__dict__.get(name, None)
@@ -101,6 +124,7 @@ class ScopedConnection(ProxyMixin):
     def __init__(self, pool, connection):
         self.pool = pool
         self.connection = connection
+        self.duration = Duration()
 
     def __del__(self):
         self.release()
@@ -112,6 +136,8 @@ class ScopedConnection(ProxyMixin):
         if not self.pool or not self.connection:
             return
         self.pool.release(self.connection)
+        self.duration.stop()
+        self.pool.record_duration(self.connection, self.duration)
         self.pool = None
         self.connection = None
 
@@ -127,6 +153,30 @@ class ConnectionPool(topology.TopoObject):
         self.max_retry = max_retry
         self.kwargs = kwargs
         self.cv = threading.Condition()
+        self.durations = defaultdict(list)
+
+    def record_duration(self, conn, duration):
+        if len(self.durations[conn]) >= 10000:
+            self.durations[conn].pop(0)
+
+        self.durations[conn].append(duration)
+
+    def stats(self):
+        out = {'connections': {}}
+        connections = out['connections']
+        take_time = []
+        for conn, durations in self.durations.items():
+            total_time = sum(d.value for d in durations)
+            connections[id(conn)] = {
+                'total_time': total_time,
+                'called_times': len(durations)
+            }
+            take_time.append(total_time)
+
+        out['max-time'] = max(take_time)
+        out['num'] = len(self.durations)
+        logger.debug(json.dumps(out, indent=2))
+        return out
 
     def __len__(self):
         return len(self.pending_pool) + len(self.active_pool)
@@ -152,7 +202,7 @@ class ConnectionPool(topology.TopoObject):
             if timeout_times >= 1:
                 return connection
 
-            # logger.debug('[Connection] Pool \"{}\" SIZE={} ACTIVE={}'.format(self.name, len(self), self.active_num))
+            # logger.error('[Connection] Pool \"{}\" SIZE={} ACTIVE={}'.format(self.name, len(self), self.active_num))
             if len(self.pending_pool) == 0:
                 connection = self.create()
             else:
@@ -180,6 +230,13 @@ class ConnectionGroup(topology.TopoGroup):
     def __init__(self, name):
         super().__init__(name)
 
+    def stats(self):
+        out = {}
+        for name, item in self.items.items():
+            out[name] = item.stats()
+
+        return out
+
     def on_pre_add(self, topo_object):
         conn = topo_object.fetch()
         conn.on_connect(metadata=None)
@@ -209,6 +266,13 @@ class ConnectionTopology(topology.Topology):
     def __init__(self):
         super().__init__()
 
+    def stats(self):
+        out = {}
+        for name, group in self.topo_groups.items():
+            out[name] = group.stats()
+
+        return out
+
     def create(self, name):
         group = ConnectionGroup(name)
         status = self.add_group(group)
diff --git a/shards/mishards/router/__init__.py b/shards/mishards/router/__init__.py
index e435ea3cc04da5253c3ad71c44567ea7ec2e62b1..2567682fdaa4e3c35629e85499dd557a57925388 100644
--- a/shards/mishards/router/__init__.py
+++ b/shards/mishards/router/__init__.py
@@ -13,6 +13,7 @@ class RouterMixin:
         conn = self.writable_topo.get_group('default').get('WOSERVER').fetch()
         if conn:
             conn.on_connect(metadata=metadata)
+        # PXU TODO: should return conn
         return conn.conn
 
     def query_conn(self, name, metadata=None):
@@ -20,4 +21,4 @@ class RouterMixin:
         if not conn:
             raise exceptions.ConnectionNotFoundError(name, metadata=metadata)
         conn.on_connect(metadata=metadata)
-        return conn.conn
+        return conn
diff --git a/shards/mishards/service_handler.py b/shards/mishards/service_handler.py
index 66942269fd0dd6749b521f80edba5c6766185509..5612af533314e35d040968bcbab898410848eea1 100644
--- a/shards/mishards/service_handler.py
+++ b/shards/mishards/service_handler.py
@@ -1,6 +1,7 @@
 import logging
 import time
 import datetime
+import json
 from collections import defaultdict
 
 import multiprocessing
@@ -142,7 +143,7 @@ class ServiceHandler(milvus_pb2_grpc.MilvusServiceServicer):
 
             with self.tracer.start_span('search_{}'.format(addr),
                                         child_of=span):
-                ret = conn.search_vectors_in_files(table_name=query_params['table_id'],
+                ret = conn.conn.search_vectors_in_files(table_name=query_params['table_id'],
                                                    file_ids=query_params['file_ids'],
                                                    query_records=vectors,
                                                    top_k=topk,
@@ -440,6 +441,12 @@ class ServiceHandler(milvus_pb2_grpc.MilvusServiceServicer):
 
         metadata = {'resp_class': milvus_pb2.StringReply}
 
+        if _cmd == 'conn_stats':
+            stats = self.router.readonly_topo.stats()
+            return milvus_pb2.StringReply(status=status_pb2.Status(
+                error_code=status_pb2.SUCCESS),
+                string_reply=json.dumps(stats, indent=2))
+
         if _cmd == 'version':
             _status, _reply = self._get_server_version(metadata=metadata)
         else:
diff --git a/shards/mishards/test_server.py b/shards/mishards/test_server.py
index b90cdf78758d49bc8cfb9af88c4e1bf157cdfe0b..b7a3ad370da46af5ba1b935381244c72be1b858a 100644
--- a/shards/mishards/test_server.py
+++ b/shards/mishards/test_server.py
@@ -265,7 +265,7 @@ class TestServer:
 
         param['nprobe'] = 2048
         RouterMixin.connection = mock.MagicMock(return_value=Milvus())
-        RouterMixin.query_conn = mock.MagicMock(return_value=Milvus())
+        RouterMixin.query_conn.conn = mock.MagicMock(return_value=Milvus())
         Milvus.describe_table = mock.MagicMock(return_value=(BAD,
                                                              table_schema))
         status, ret = self.client.search_vectors(**param)
diff --git a/shards/requirements.txt b/shards/requirements.txt
index 8f4667f34d5923d87b275db70d82f5b0c6799fee..47e1e521c21d7c5f2c830c5194bae0d2ea221382 100644
--- a/shards/requirements.txt
+++ b/shards/requirements.txt
@@ -30,7 +30,7 @@ requests-oauthlib==1.2.0
 rsa==4.0
 six==1.12.0
 SQLAlchemy==1.3.5
-urllib3==1.25.8
+urllib3==1.25.3
 jaeger-client>=3.4.0
 grpcio-opentracing>=1.0
 mock==2.0.0