diff --git a/cmake/external/grpc.cmake b/cmake/external/grpc.cmake
index 85f40585da29bab9a107f5546e64870975f4c2d3..e06c337254d39ebc87fb6bbd9e6bcbd9bae18218 100644
--- a/cmake/external/grpc.cmake
+++ b/cmake/external/grpc.cmake
@@ -44,8 +44,10 @@ ExternalProject_Add(
     # 3. keep only zlib, cares, protobuf, boringssl under "third_party",
     #    checkout and clean other dirs under third_party
     # 4. remove .git, and package the directory.
-    URL "http://paddlepaddledeps.bj.bcebos.com/grpc-v1.10.x.tar.gz"
-    URL_MD5  "1f268a2aff6759839dccd256adcc91cf"
+    #URL "http://paddlepaddledeps.bj.bcebos.com/grpc-v1.10.x.tar.gz"
+    URL "http://localhost:8000/grpc-v1.13.x.tar.gz"
+    #URL_MD5  "1f268a2aff6759839dccd256adcc91cf"
+    URL_MD5 "27019f520a32161396b319e57c24a5ac"
     PREFIX          ${GRPC_SOURCES_DIR}
     UPDATE_COMMAND  ""
     CONFIGURE_COMMAND ""
diff --git a/paddle/fluid/operators/distributed/grpc_client.cc b/paddle/fluid/operators/distributed/grpc_client.cc
index 8228a8c5a3eae73fe82551c8aad55290b0d54ef0..c42f7e4326efd6c8ef153a3eab724516f4ee49fb 100644
--- a/paddle/fluid/operators/distributed/grpc_client.cc
+++ b/paddle/fluid/operators/distributed/grpc_client.cc
@@ -47,8 +47,11 @@ GRPCClient::~GRPCClient() {
   {
     std::lock_guard<std::mutex> guard(chan_mutex_);
     for (auto& it : channels_) {
+      LOG(ERROR) << "channel ptr use count:" << it.second.use_count();
+      LOG(ERROR) << "channel ptr use count:" << it.second.get();
       it.second.reset();
     }
+    channels_.clear();
   }
   client_thread_->join();
 }
@@ -301,7 +304,9 @@ std::shared_ptr<grpc::Channel> GRPCClient::GetChannel(const std::string& ep) {
 
   auto ch =
       grpc::CreateCustomChannel(ep, grpc::InsecureChannelCredentials(), args);
+  LOG(ERROR) << "get channel ep: " << ep << "count: " << ch.use_count();
   channels_[ep] = ch;
+  LOG(ERROR) << "get channel ep: " << ep << "count: " << ch.use_count();
   return ch;
 }
 
diff --git a/paddle/fluid/string/printf.h b/paddle/fluid/string/printf.h
index e0f6202506868fd0dcbe93297785682edbcfe792..062095a1c3e977c0bcc89346ead765acb023bcf7 100644
--- a/paddle/fluid/string/printf.h
+++ b/paddle/fluid/string/printf.h
@@ -84,7 +84,7 @@ void Fprintf(std::ostream& out, const char* fmt, const Args&... args) {
 }
 
 template <typename... Args>
-std::string Sprintf(const char* fmt = "", const Args&... args) {
+std::string Sprintf(const char* fmt, const Args&... args) {
   std::ostringstream oss;
   Fprintf(oss, fmt, args...);
   return oss.str();