diff --git a/paddle/fluid/framework/fleet/fleet_wrapper.cc b/paddle/fluid/framework/fleet/fleet_wrapper.cc
index 4d632d737611e9c04d8f60d34bbb9518266e2810..135fc407943c6c03c2b0d32ad5a9650daa5ea3e4 100644
--- a/paddle/fluid/framework/fleet/fleet_wrapper.cc
+++ b/paddle/fluid/framework/fleet/fleet_wrapper.cc
@@ -1166,6 +1166,28 @@ int32_t FleetWrapper::CopyTable(const uint64_t src_table_id,
 #endif
 }
 
+void FleetWrapper::Confirm() {
+#ifdef PADDLE_WITH_PSLIB
+  // FIXME(xujiaqi01): will later support confirm
+  // auto ret = pslib_ptr_->_worker_ptr->confirm();
+  // ret.wait();
+  VLOG(0) << "disable FleetWrapper::Confirm temporarily";
+#else
+  VLOG(0) << "FleetWrapper::Confirm does nothing when no pslib";
+#endif
+}
+
+void FleetWrapper::Revert() {
+#ifdef PADDLE_WITH_PSLIB
+  // FIXME(xujiaqi01): will later support revert
+  // auto ret = pslib_ptr_->_worker_ptr->revert();
+  // ret.wait();
+  VLOG(0) << "disable FleetWrapper::Revert temporarily";
+#else
+  VLOG(0) << "FleetWrapper::Revert does nothing when no pslib";
+#endif
+}
+
 int32_t FleetWrapper::CopyTableByFeasign(
     const uint64_t src_table_id, const uint64_t dest_table_id,
     const std::vector<uint64_t>& feasign_list) {
diff --git a/paddle/fluid/framework/fleet/fleet_wrapper.h b/paddle/fluid/framework/fleet/fleet_wrapper.h
index 933b0a8bd852cfa2b1fb1b485cfd3ef2d012dd11..4c0564f87d48b4ba06bdb75e94fbb80b3d4f448a 100644
--- a/paddle/fluid/framework/fleet/fleet_wrapper.h
+++ b/paddle/fluid/framework/fleet/fleet_wrapper.h
@@ -268,6 +268,10 @@ class FleetWrapper {
   // send client to client message
   std::future<int32_t> SendClientToClientMsg(int msg_type, int to_client_id,
                                              const std::string& msg);
+  // confirm all the updated params in the current pass
+  void Confirm();
+  // revert all the updated params in the current pass
+  void Revert();
   // FleetWrapper singleton
   static std::shared_ptr<FleetWrapper> GetInstance() {
     if (NULL == s_instance_) {
diff --git a/paddle/fluid/framework/fleet/gloo_wrapper.cc b/paddle/fluid/framework/fleet/gloo_wrapper.cc
index c599432ff190ae78a3b24dc5e7d3d6b7669e67d5..45512d6adc49c577c2332ae2ef2c42408138990e 100644
--- a/paddle/fluid/framework/fleet/gloo_wrapper.cc
+++ b/paddle/fluid/framework/fleet/gloo_wrapper.cc
@@ -10,16 +10,18 @@ See the License for the specific language governing permissions and
 limitations under the License. */
 
 #include "paddle/fluid/framework/fleet/gloo_wrapper.h"
+#include <thread>  // NOLINT
 #include <vector>
 #include "paddle/fluid/framework/io/fs.h"
 #include "paddle/fluid/platform/errors.h"
+#include "paddle/fluid/string/string_helper.h"
 
 namespace gloo {
 namespace rendezvous {
 
 HdfsStore::HdfsStore(const std::string& path) {
   path_ = path;
-  wait_sleep_ms_ = 3000;
+  wait_sleep_ms_ = 10000;
   wait_timeout_ = std::chrono::seconds(999999999);
   retry_times_ = 100;
 }
@@ -35,49 +37,86 @@ void HdfsStore::set(const std::string& key, const std::vector<char>& data) {
   }
   int err_no = 0;
   for (int i = 1; i <= retry_times_; ++i) {
+    err_no = 0;
     std::shared_ptr<FILE> fp =
         paddle::framework::fs_open_write(tmp, &err_no, "");
-    if (err_no != 0) {
-      VLOG(0) << "fs_open_write failed, retry times " << i << " err no "
-              << err_no;
-      fp.reset();
-      sleep(wait_sleep_ms_ / 1000);
-      continue;
-    }
     size_t write_count = fwrite_unlocked(data.data(), 1, data.size(), fp.get());
     if (write_count != data.size()) {
       VLOG(0) << "fwrite_unlocked failed, retry times " << i << " write_count "
               << write_count << " data.size() " << data.size();
-      fp.reset();
-      sleep(2);
-      continue;
+      err_no = -1;
     }
     fp.reset();
-    break;
+    if (err_no != 0) {
+      VLOG(0) << "fs_open_write failed, retry times " << i << " err no "
+              << err_no;
+      sleep(wait_sleep_ms_ / 1000);
+      paddle::framework::fs_remove(tmp);
+      if (i == retry_times_) {
+        VLOG(0) << "fs_open_write failed, retry times reaches limit";
+        PADDLE_THROW(platform::errors::PreconditionNotMet(
+            "fs_open_write failed, retry times reaches"
+            " limit ",
+            retry_times_));
+      }
+    } else {
+      break;
+    }
   }
   paddle::framework::fs_mv(tmp, path);
 #endif
 }
 
+#ifdef PADDLE_WITH_GLOO
+int retry_do_func(std::function<int(void)> func, uint32_t max_try_time,
+                  uint32_t retry_interval_ms) {
+  for (uint32_t i = 0; i < max_try_time; ++i) {
+    if (func() == 0) {
+      return 0;
+    }
+#ifdef _LINUX
+    usleep(retry_interval_ms * 1000);
+#endif
+  }
+  return -1;
+}
+#endif
+
 std::vector<char> HdfsStore::get(const std::string& key) {
   auto path = ObjectPath(key);
   std::vector<char> result;
 #ifdef PADDLE_WITH_GLOO
   // block until key is set
   wait({key});
-  bool is_exists = paddle::framework::fs_exists(path);
+  int ret = retry_do_func(
+      [&path]() { return paddle::framework::fs_exists(path) ? 0 : -1; }, 5,
+      wait_sleep_ms_);
+  bool is_exists = (ret == 0);
   PADDLE_ENFORCE_EQ(is_exists, true,
                     paddle::platform::errors::NotFound(
                         "HdfsStore::get, path not exists: " + path));
-  int err_no = 0;
-  std::shared_ptr<FILE> fp = paddle::framework::fs_open_read(path, &err_no, "");
-  char buffer = '\0';
-  size_t read_count = 0;
-  while (fread(&buffer, 1, 1, fp.get()) == 1) {
-    ++read_count;
-    result.push_back(buffer);
-  }
-  VLOG(3) << "HdfsStore::get read_count " << read_count;
+
+  int read_status = retry_do_func(
+      [&path, &result]() {
+        result.clear();
+        int err_no = 0;
+        {
+          std::shared_ptr<FILE> fp =
+              paddle::framework::fs_open_read(path, &err_no, "");
+          char buffer = '\0';
+          size_t read_count = 0;
+          while (fread(&buffer, 1, 1, fp.get()) == 1) {
+            ++read_count;
+            result.push_back(buffer);
+          }
+          VLOG(3) << "HdfsStore::get read_count " << read_count;
+        }
+        return err_no;
+      },
+      5, wait_sleep_ms_);
+  PADDLE_ENFORCE_EQ(read_status, 0,
+                    paddle::platform::errors::Fatal(
+                        "HdfsStore::get, path read faied: " + path));
 #endif
   return result;
 }
@@ -92,22 +131,33 @@ void HdfsStore::wait(const std::vector<std::string>& keys,
                      const std::chrono::milliseconds&) {  // NOLINT
 #ifdef PADDLE_WITH_GLOO
   auto start = std::chrono::steady_clock::now();
-  while (!Check(keys)) {
+  std::vector<bool> check_key_status(keys.size(), false);
+  while (!Check(keys, &check_key_status)) {
     auto elapsed = std::chrono::duration_cast<std::chrono::seconds>(
         std::chrono::steady_clock::now() - start);
     if (wait_timeout_ != gloo::kNoTimeout && elapsed > wait_timeout_) {
-      PADDLE_ENFORCE_EQ(0, 1, paddle::platform::errors::ExecutionTimeout(
-                                  "HdfsStore::wait, Wait timeout for key(s): " +
-                                  ::gloo::MakeString(keys)));
+      int32_t last_check_rank = -1;
+      for (size_t i = 0; i < check_key_status.size(); ++i) {
+        if (!check_key_status[i]) {
+          last_check_rank = i;
+          break;
+        }
+      }
+      PADDLE_THROW(platform::errors::ExecutionTimeout(
+          "TIMEOUT self_rank = %d pair_rank = %d", self_rank_,
+          last_check_rank));
     }
     std::this_thread::sleep_for(std::chrono::milliseconds(wait_sleep_ms_));
   }
 #endif
 }
 
+void HdfsStore::SetTimeoutSeconds(int timeout_seconds) {
+  wait_timeout_ = std::chrono::seconds(timeout_seconds);
+}
+
 std::string HdfsStore::EncodeName(const std::string& name) {
-  thread_local std::hash<std::string> hash_func;
-  return std::to_string(hash_func(name));
+  return ::paddle::string::erase_spaces(name);
 }
 
 std::string HdfsStore::TmpPath(const std::string& name) {
@@ -118,50 +168,124 @@ std::string HdfsStore::ObjectPath(const std::string& name) {
   return path_ + "/" + EncodeName(name);
 }
 
-bool HdfsStore::Check(const std::vector<std::string>& keys) {
+bool HdfsStore::Check(const std::vector<std::string>& keys,
+                      std::vector<bool>* keys_check_status) {
 #ifdef PADDLE_WITH_GLOO
+  bool ret = true;
   std::vector<std::string> paths;
   for (const auto& key : keys) {
     paths.push_back(ObjectPath(key));
   }
-  for (const auto& path : paths) {
+  for (size_t i = 0; i < paths.size(); ++i) {
+    if ((*keys_check_status)[i]) {
+      continue;
+    }
+    const auto& path = paths[i];
     bool is_exists = paddle::framework::fs_exists(path);
     VLOG(3) << "HdfsStore::Check " << is_exists << " path " << path;
     if (!is_exists) {
-      return false;
+      ret = false;
     }
+    (*keys_check_status)[i] = is_exists;
   }
+  return ret;
+#else
+  VLOG(0) << "HdfsStore::Check does nothing when no gloo";
 #endif
   return true;
 }
 
+#ifdef PADDLE_WITH_GLOO
+void ParallelConnectContext::connectFullMesh(
+    Store& store, std::shared_ptr<transport::Device>& dev) {
+  std::vector<char> allBytes;
+  // Create pairs
+  auto transportContext = dev->createContext(rank, size);
+  transportContext->setTimeout(getTimeout());
+  for (int i = 0; i < size; i++) {
+    if (i == rank) {
+      continue;
+    }
+    auto& pair = transportContext->createPair(i);
+    auto addrBytes = pair->address().bytes();
+    allBytes.insert(allBytes.end(), addrBytes.begin(), addrBytes.end());
+  }
+  std::ostringstream storeKey;
+  storeKey << rank;
+  store.set(storeKey.str(), allBytes);
+
+  std::vector<std::shared_ptr<std::thread>> connect_threads(thread_num_);
+  // Connect every pair
+  for (uint32_t i = 0; i < connect_threads.size(); ++i) {
+    connect_threads[i].reset(new std::thread(
+        [&store, &transportContext, this](size_t thread_idx,
+                                          size_t thread_num) -> void {
+          for (int i = thread_idx; i < size; i += thread_num) {
+            if (i == rank) {
+              continue;
+            }
+            // Wait for address of other side of this pair to become available
+            std::string key = std::to_string(i);
+            store.wait({key}, getTimeout());
+            // Connect to other side of this pair
+            auto allAddrs = store.get(key);
+            auto addr = extractAddress(allAddrs, i);
+            transportContext->getPair(i)->connect(addr);
+          }
+        },
+        i, connect_threads.size()));
+  }
+  for (uint32_t i = 0; i < connect_threads.size(); ++i) {
+    connect_threads[i]->join();
+  }
+  device_ = dev;
+  transportContext_ = std::move(transportContext);
+}
+#endif
 }  // namespace rendezvous
 }  // namespace gloo
 
 namespace paddle {
 namespace framework {
 
-void GlooWrapper::Init(int rank, int size, const std::string& path,
-                       const std::string& fs_name, const std::string& fs_ugi,
-                       const std::string& iface, const std::string& prefix) {
+void GlooWrapper::Init() {
   if (is_initialized_) {
     return;
   }
-  rank_ = rank;
-  size_ = size;
-  std::string cmd = std::string("${HADOOP_HOME}/bin/hadoop fs");
-  cmd += " -D fs.default.name=" + fs_name;
-  cmd += " -D hadoop.job.ugi=" + fs_ugi;
-  paddle::framework::hdfs_set_command(cmd);
 #ifdef PADDLE_WITH_GLOO
   gloo::transport::tcp::attr attr;
-  attr.iface = iface;
-  auto file_store = gloo::rendezvous::HdfsStore(path);
-  auto prefix_store = gloo::rendezvous::PrefixStore(prefix, file_store);
+  attr.iface = iface_;
+  std::shared_ptr<gloo::rendezvous::HdfsStore> file_store = nullptr;
+  std::shared_ptr<gloo::rendezvous::HTTPStore> http_store = nullptr;
+  auto context =
+      std::make_shared<gloo::rendezvous::ParallelConnectContext>(rank_, size_);
+  context->setTimeout(run_timeout_);
   auto dev = gloo::transport::tcp::CreateDevice(attr);
-  auto context = std::make_shared<gloo::rendezvous::Context>(rank, size);
-  context->setTimeout(file_store.wait_timeout_);
-  context->connectFullMesh(prefix_store, dev);
+  switch (store_type_) {
+    case GlooStoreType::HDFS: {
+      std::string cmd = std::string("${HADOOP_HOME}/bin/hadoop fs");
+      cmd += " -D fs.default.name=" + hdfs_name_;
+      cmd += " -D hadoop.job.ugi=" + hdfs_ugi_;
+      paddle::framework::hdfs_set_command(cmd);
+      file_store = std::make_shared<gloo::rendezvous::HdfsStore>(hdfs_path_);
+      file_store->SetTimeoutSeconds(init_timeout_.count());
+      auto prefix_store =
+          std::make_shared<gloo::rendezvous::PrefixStore>(prefix_, *file_store);
+      context->connectFullMesh(*prefix_store, dev);
+      break;
+    }
+    case GlooStoreType::HTTP: {
+      http_store = std::make_shared<gloo::rendezvous::HTTPStore>(
+          http_ip_, http_port_, prefix_ + "_" + http_scope_, rank_);
+      http_store->SetTimeoutSeconds(init_timeout_.count());
+      context->connectFullMesh(*http_store, dev);
+      http_store->Finalize();
+      break;
+    }
+    default:
+      LOG(ERROR) << "unknown store type " << store_type_;
+      exit(-1);
+  }
   context_ = std::move(context);
 #endif
   is_initialized_ = true;
@@ -170,6 +294,9 @@ void GlooWrapper::Init(int rank, int size, const std::string& path,
 template std::vector<int64_t> GlooWrapper::AllReduce<int64_t>(
     std::vector<int64_t>& sendbuf,  // NOLINT
     const std::string& mode);
+template std::vector<float> GlooWrapper::AllReduce<float>(
+    std::vector<float>& sendbuf,  // NOLINT
+    const std::string& mode);
 template std::vector<double> GlooWrapper::AllReduce<double>(
     std::vector<double>& sendbuf,  // NOLINT
     const std::string& mode);
@@ -180,6 +307,8 @@ template std::vector<int64_t> GlooWrapper::AllGather<int64_t>(
     int64_t& input);  // NOLINT
 template std::vector<uint64_t> GlooWrapper::AllGather<uint64_t>(
     uint64_t& input);  // NOLINT
+template std::vector<float> GlooWrapper::AllGather<float>(
+    float& input);  // NOLINT
 template std::vector<double> GlooWrapper::AllGather<double>(
     double& input);  // NOLINT
 
diff --git a/paddle/fluid/framework/fleet/gloo_wrapper.h b/paddle/fluid/framework/fleet/gloo_wrapper.h
index 528c91be6d4b9af7ce8bdfefdc98d4bad9896db3..3f932ee226ca85b86c92fef1b30420d782d9bc62 100644
--- a/paddle/fluid/framework/fleet/gloo_wrapper.h
+++ b/paddle/fluid/framework/fleet/gloo_wrapper.h
@@ -31,6 +31,7 @@ limitations under the License. */
 #include <gloo/barrier.h>
 #include <gloo/rendezvous/context.h>
 #include <gloo/rendezvous/file_store.h>
+#include <gloo/rendezvous/http_store.h>
 #include <gloo/rendezvous/prefix_store.h>
 #include <gloo/rendezvous/store.h>
 #include <gloo/transport/tcp/device.h>
@@ -59,44 +60,87 @@ class HdfsStore {
   virtual void wait(const std::vector<std::string>& keys,
                     const std::chrono::milliseconds& timeout);
 
+  virtual void SetTimeoutSeconds(int timeout_seconds);
+
   std::string EncodeName(const std::string& name);
 
   std::string TmpPath(const std::string& name);
 
   std::string ObjectPath(const std::string& name);
 
-  bool Check(const std::vector<std::string>& keys);
+  bool Check(const std::vector<std::string>& keys,
+             std::vector<bool>* keys_check_status);
+
+  void SetRank(int rank) { self_rank_ = rank; }
 
   std::string path_;
   int wait_sleep_ms_;
   std::chrono::seconds wait_timeout_;
   int retry_times_;
+  int self_rank_;
 };
 
+#ifdef PADDLE_WITH_GLOO
+class ParallelConnectContext : public gloo::rendezvous::Context {
+ public:
+  ParallelConnectContext(int rank, int size, int base = 2)
+      : gloo::rendezvous::Context(rank, size, base) {}
+  virtual ~ParallelConnectContext() {}
+  // in gloo::rendezvous::Context wait&get one by one,
+  // slowly in case big size, especialy in HdfsStore
+  void connectFullMesh(Store& store,                              // NOLINT
+                       std::shared_ptr<transport::Device>& dev);  // NOLINT
+
+ protected:
+  int thread_num_ = 6;
+};
+#endif
 }  // namespace rendezvous
 }  // namespace gloo
 
 namespace paddle {
 namespace framework {
 
+enum GlooStoreType { HDFS, HTTP };
+
 class GlooWrapper {
  public:
   GlooWrapper() {}
 
   virtual ~GlooWrapper() {}
 
-  void Init(int rank, int size, const std::string& path,
-            const std::string& fs_name, const std::string& fs_ugi,
-            const std::string& iface, const std::string& prefix);
+  void Init();
 
-  int Rank() {
-    CHECK_EQ(is_initialized_, true);
-    return rank_;
+  void SetTimeoutSeconds(int init_seconds, int run_seconds) {
+    init_timeout_ = std::chrono::seconds(init_seconds);
+    run_timeout_ = std::chrono::seconds(run_seconds);
   }
 
-  int Size() {
-    CHECK_EQ(is_initialized_, true);
-    return size_;
+  int Rank() { return rank_; }
+
+  int Size() { return size_; }
+
+  void SetRank(int rank) { rank_ = rank; }
+
+  void SetSize(int size) { size_ = size; }
+
+  void SetIface(const std::string& iface) { iface_ = iface; }
+
+  void SetPrefix(const std::string& prefix) { prefix_ = prefix; }
+
+  void SetHdfsStore(const std::string& path, const std::string& fs_name,
+                    const std::string& fs_ugi) {
+    store_type_ = GlooStoreType::HDFS;
+    hdfs_path_ = path;
+    hdfs_name_ = fs_name;
+    hdfs_ugi_ = fs_ugi;
+  }
+
+  void SetHttpStore(const std::string& ip, int port, const std::string& scope) {
+    store_type_ = GlooStoreType::HTTP;
+    http_ip_ = ip;
+    http_port_ = port;
+    http_scope_ = scope;
   }
 
   void Barrier() {
@@ -104,6 +148,8 @@ class GlooWrapper {
 #ifdef PADDLE_WITH_GLOO
     gloo::BarrierOptions opts(context_);
     gloo::barrier(opts);
+#else
+    LOG(WARNING) << "Barrier does nothing when WITH_GLOO=OFF";
 #endif
   }
 
@@ -134,6 +180,8 @@ class GlooWrapper {
                                   "AllReduce mode not known: " + mode));
     }
     gloo::allreduce(opts);
+#else
+    LOG(WARNING) << "AllReduce does nothing when WITH_GLOO=OFF";
 #endif
     return recvbuf;
   }
@@ -147,6 +195,8 @@ class GlooWrapper {
     opts.setInput(&input, 1);
     opts.setOutput(ret.data(), size_);
     gloo::allgather(opts);
+#else
+    LOG(WARNING) << "AllGather does nothing when WITH_GLOO=OFF";
 #endif
     return std::move(ret);
   }
@@ -158,6 +208,19 @@ class GlooWrapper {
 #endif
   int rank_ = 0;
   int size_ = 0;
+  std::chrono::seconds init_timeout_ = std::chrono::seconds(9999999);
+  std::chrono::seconds run_timeout_ = std::chrono::seconds(9999999);
+  std::string iface_ = "lo";
+  std::string prefix_;
+  GlooStoreType store_type_ = GlooStoreType::HDFS;
+  // configs for hdfs store
+  std::string hdfs_path_;
+  std::string hdfs_name_;
+  std::string hdfs_ugi_;
+  std::string http_ip_;
+  // configs for http store
+  int http_port_;
+  std::string http_scope_;
 };
 
 }  // namespace framework
diff --git a/paddle/fluid/framework/fleet/test_fleet.cc b/paddle/fluid/framework/fleet/test_fleet.cc
index bf9928789cafeb1455bb241b76482bf78a737871..dac95dd268e4547b2abc551d9c8181904d246147 100644
--- a/paddle/fluid/framework/fleet/test_fleet.cc
+++ b/paddle/fluid/framework/fleet/test_fleet.cc
@@ -17,6 +17,7 @@
 #include "paddle/fluid/framework/fleet/fleet_wrapper.h"
 #include "paddle/fluid/framework/fleet/gloo_wrapper.h"
 #include "paddle/fluid/framework/io/fs.h"
+#include "paddle/fluid/string/string_helper.h"
 
 #if defined _WIN32 || defined __APPLE__
 #else
@@ -37,14 +38,23 @@ TEST(TEST_GLOO, store_1) {
   }
   store.wait(std::vector<std::string>{"test"});
   store.wait(std::vector<std::string>{"test"}, std::chrono::milliseconds(0));
+  store.SetTimeoutSeconds(100000);
   store.EncodeName("1");
   store.TmpPath("1");
   store.ObjectPath("1");
-  store.Check(std::vector<std::string>{"test"});
+  std::vector<bool> status(1, false);
+  store.Check(std::vector<std::string>{"test"}, &status);
 
   auto gw = paddle::framework::GlooWrapper();
-  gw.Init(0, 1, "", "", "", "", "");
-  gw.Init(0, 1, "", "", "", "", "");
+  gw.SetTimeoutSeconds(1000, 1000);
+  gw.SetRank(0);
+  gw.SetSize(1);
+  gw.SetPrefix("");
+  gw.SetIface("lo");
+  gw.SetHdfsStore("", "", "");
+  gw.Init();
+  gw.SetHttpStore("", 8099, "");
+  gw.Init();
   gw.Rank();
   gw.Size();
   gw.Barrier();
@@ -63,5 +73,8 @@ TEST(TEST_FLEET, fleet_1) {
   fleet->RunServer("", 0);
   fleet->SaveModelOneTable(0, "", 0);
   fleet->SaveModelOneTablePrefix(0, "", 0, "");
+  fleet->Confirm();
+  fleet->Revert();
+  paddle::string::erase_spaces("1 2");
 #endif
 }
diff --git a/paddle/fluid/pybind/fleet_wrapper_py.cc b/paddle/fluid/pybind/fleet_wrapper_py.cc
index 3ae4eef44910031dd9f93c3286d404c51c11c1fe..4b72b09adddf24f63814e8e4872af289b38bcb44 100644
--- a/paddle/fluid/pybind/fleet_wrapper_py.cc
+++ b/paddle/fluid/pybind/fleet_wrapper_py.cc
@@ -78,6 +78,8 @@ void BindFleetWrapper(py::module* m) {
            &framework::FleetWrapper::SetClient2ClientConfig)
       .def("set_pull_local_thread_num",
            &framework::FleetWrapper::SetPullLocalThreadNum)
+      .def("confirm", &framework::FleetWrapper::Confirm)
+      .def("revert", &framework::FleetWrapper::Revert)
       .def("save_model_one_table", &framework::FleetWrapper::SaveModelOneTable)
       .def("save_model_one_table_with_prefix",
            &framework::FleetWrapper::SaveModelOneTablePrefix)
diff --git a/paddle/fluid/pybind/gloo_wrapper_py.cc b/paddle/fluid/pybind/gloo_wrapper_py.cc
index 80260ae2f2929693219a93bf7c4b9eeb4884113d..e570333d091b40f7ee9c34b02c98f3711e98e5f4 100644
--- a/paddle/fluid/pybind/gloo_wrapper_py.cc
+++ b/paddle/fluid/pybind/gloo_wrapper_py.cc
@@ -37,11 +37,20 @@ void BindGlooWrapper(py::module* m) {
       .def("rank", &framework::GlooWrapper::Rank)
       .def("size", &framework::GlooWrapper::Size)
       .def("barrier", &framework::GlooWrapper::Barrier)
+      .def("set_timeout_seconds", &framework::GlooWrapper::SetTimeoutSeconds)
+      .def("set_rank", &framework::GlooWrapper::SetRank)
+      .def("set_size", &framework::GlooWrapper::SetSize)
+      .def("set_iface", &framework::GlooWrapper::SetIface)
+      .def("set_prefix", &framework::GlooWrapper::SetPrefix)
+      .def("set_hdfs_store", &framework::GlooWrapper::SetHdfsStore)
+      .def("set_http_store", &framework::GlooWrapper::SetHttpStore)
       .def("all_reduce", &framework::GlooWrapper::AllReduce<uint64_t>)
       .def("all_reduce", &framework::GlooWrapper::AllReduce<int64_t>)
+      .def("all_reduce", &framework::GlooWrapper::AllReduce<float>)
       .def("all_reduce", &framework::GlooWrapper::AllReduce<double>)
       .def("all_gather", &framework::GlooWrapper::AllGather<uint64_t>)
       .def("all_gather", &framework::GlooWrapper::AllGather<int64_t>)
+      .def("all_gather", &framework::GlooWrapper::AllGather<float>)
       .def("all_gather", &framework::GlooWrapper::AllGather<double>);
 }  // end BindGlooWrapper
 }  // end namespace pybind
diff --git a/paddle/fluid/string/string_helper.cc b/paddle/fluid/string/string_helper.cc
index 27708b8eebd2131ebadcc310fd3521ad5ab824f3..712db90d2f4ba62abdb0747827d78266503efcc5 100644
--- a/paddle/fluid/string/string_helper.cc
+++ b/paddle/fluid/string/string_helper.cc
@@ -61,6 +61,19 @@ std::string trim_spaces(const std::string& str) {
   return std::string(p, len);
 }
 
+std::string erase_spaces(const std::string& str) {
+  std::string result;
+  result.reserve(str.size());
+  const char* p = str.c_str();
+  while (*p != 0) {
+    if (!isspace(*p)) {
+      result.append(p, 1);
+    }
+    ++p;
+  }
+  return result;
+}
+
 inline int str_to_float(const char* str, float* v) {
   const char* head = str;
   char* cursor = NULL;
diff --git a/paddle/fluid/string/string_helper.h b/paddle/fluid/string/string_helper.h
index cc09088c7ee8a38e3b3a7a673c9da2e21cf42485..8bf379a6b3423fed07d3ab670e0492a9316e8e19 100644
--- a/paddle/fluid/string/string_helper.h
+++ b/paddle/fluid/string/string_helper.h
@@ -62,6 +62,9 @@ std::string format_string(const std::string& fmt, ARGS&&... args) {
 // remove leading and tailing spaces
 std::string trim_spaces(const std::string& str);
 
+// erase all spaces in str
+std::string erase_spaces(const std::string& str);
+
 int str_to_float(const char* str, float* v);
 
 // split string by delim
diff --git a/python/paddle/fluid/incubate/fleet/base/role_maker.py b/python/paddle/fluid/incubate/fleet/base/role_maker.py
index bada19abcc32d2bc91d99203a7b66389aca912d3..c8005dce44f779ba264f4ccaa73584c5008efe2f 100644
--- a/python/paddle/fluid/incubate/fleet/base/role_maker.py
+++ b/python/paddle/fluid/incubate/fleet/base/role_maker.py
@@ -14,6 +14,7 @@
 """Defination of Role Makers."""
 
 from __future__ import print_function
+from multiprocessing import Process, Manager
 import paddle.fluid as fluid
 import os
 import time
@@ -556,7 +557,21 @@ class GeneralRoleMaker(RoleMakerBase):
         self._role_is_generated = False
         self._hdfs_name = kwargs.get("hdfs_name", "")
         self._hdfs_ugi = kwargs.get("hdfs_ugi", "")
-        self._hdfs_path = kwargs.get("path", "")
+        self._hdfs_path = kwargs.get("path", "").rstrip("/")
+        self._init_timeout_seconds = kwargs.get("init_timeout_seconds", 3600)
+        self._run_timeout_seconds = kwargs.get("run_timeout_seconds", 9999999)
+        ip_port = kwargs.get("http_ip_port", "")
+        self._http_ip_port = []
+        self._http_server = None
+        # if ip_port is not empty, it will use http instead of hdfs
+        if ip_port != "":
+            self._http_ip_port = ip_port.split(":")
+            # it's for communication between processes
+            self._manager = Manager()
+            # global dict to store status
+            self._http_server_d = self._manager.dict()
+            # set running status of http server
+            self._http_server_d["running"] = False
         self._iface = self.__get_default_iface()
         # this environment variable can be empty
         self._prefix = os.getenv("SYS_JOB_ID", "")
@@ -572,17 +587,41 @@ class GeneralRoleMaker(RoleMakerBase):
             trainers_num = len(worker_endpoints)
             if training_role not in ["TRAINER", "PSERVER"]:
                 raise ValueError("TRAINING_ROLE must be PSERVER or TRAINER")
+
             if training_role == "TRAINER":
                 role = Role.WORKER
                 current_id = int(os.environ["PADDLE_TRAINER_ID"])
+                if current_id == 0 and len(self._http_ip_port) != 0:
+                    size_d = {
+                        "trainer": len(worker_endpoints),
+                        "pserver": len(eplist),
+                        "all": len(worker_endpoints) + len(eplist)
+                    }
+                    # child process for http server
+                    self._http_server = Process(
+                        target=self.__start_kv_server,
+                        args=(self._http_server_d, size_d))
+                    self._http_server.daemon = True
+                    # set running status to True
+                    self._http_server_d["running"] = True
+                    # start child process
+                    self._http_server.start()
                 self._node_type = 1
                 self._cur_endpoint = worker_endpoints[current_id]
                 gloo = fluid.core.Gloo()
-                gloo.init(current_id,
-                          len(worker_endpoints),
-                          self._hdfs_path.rstrip("/") + "/trainer",
-                          self._hdfs_name, self._hdfs_ugi, self._iface,
-                          self._prefix)
+                gloo.set_rank(current_id)
+                gloo.set_size(len(worker_endpoints))
+                gloo.set_prefix(self._prefix)
+                gloo.set_iface(self._iface)
+                gloo.set_timeout_seconds(self._init_timeout_seconds,
+                                         self._run_timeout_seconds)
+                if len(self._http_ip_port) != 0:
+                    gloo.set_http_store(self._http_ip_port[0],
+                                        int(self._http_ip_port[1]), "trainer")
+                else:
+                    gloo.set_hdfs_store(self._hdfs_path + "/trainer",
+                                        self._hdfs_name, self._hdfs_ugi)
+                gloo.init()
                 self._node_type_comm = gloo
             elif training_role == "PSERVER":
                 role = Role.SERVER
@@ -598,20 +637,36 @@ class GeneralRoleMaker(RoleMakerBase):
                 self._node_type = 0
                 self._cur_endpoint = cur_endpoint
                 gloo = fluid.core.Gloo()
-                gloo.init(current_id,
-                          len(eplist),
-                          self._hdfs_path.rstrip("/") + "/pserver",
-                          self._hdfs_name, self._hdfs_ugi, self._iface,
-                          self._prefix)
+                gloo.set_rank(current_id)
+                gloo.set_size(len(eplist))
+                gloo.set_prefix(self._prefix)
+                gloo.set_iface(self._iface)
+                gloo.set_timeout_seconds(self._init_timeout_seconds,
+                                         self._run_timeout_seconds)
+                if len(self._http_ip_port) != 0:
+                    gloo.set_http_store(self._http_ip_port[0],
+                                        int(self._http_ip_port[1]), "pserver")
+                else:
+                    gloo.set_hdfs_store(self._hdfs_path + "/pserver",
+                                        self._hdfs_name, self._hdfs_ugi)
+                gloo.init()
                 self._node_type_comm = gloo
 
             gloo = fluid.core.Gloo()
             all_list = worker_endpoints + eplist
-            gloo.init(
-                all_list.index(self._cur_endpoint),
-                len(all_list),
-                self._hdfs_path.rstrip("/") + "/all", self._hdfs_name,
-                self._hdfs_ugi, self._iface, self._prefix)
+            gloo.set_rank(all_list.index(self._cur_endpoint))
+            gloo.set_size(len(all_list))
+            gloo.set_prefix(self._prefix)
+            gloo.set_iface(self._iface)
+            gloo.set_timeout_seconds(self._init_timeout_seconds,
+                                     self._run_timeout_seconds)
+            if len(self._http_ip_port) != 0:
+                gloo.set_http_store(self._http_ip_port[0],
+                                    int(self._http_ip_port[1]), "all")
+            else:
+                gloo.set_hdfs_store(self._hdfs_path + "/all", self._hdfs_name,
+                                    self._hdfs_ugi)
+            gloo.init()
             self._all_comm = gloo
             self._trainers_num = trainers_num
             self._server_endpoints = eplist
@@ -620,6 +675,11 @@ class GeneralRoleMaker(RoleMakerBase):
             self._rank = all_list.index(self._cur_endpoint)
             self._size = len(all_list)
             self._worker_endpoints = worker_endpoints
+            if self._http_server is not None:
+                # set running status to False
+                self._http_server_d["running"] = False
+                # wait until child process exits
+                self._http_server.join()
             self._role_is_generated = True
 
     def all_gather(self, input):
@@ -872,6 +932,16 @@ class GeneralRoleMaker(RoleMakerBase):
                         return intf_name
         return "lo"
 
+    def __start_kv_server(self, http_server_d, size_d):
+        from paddle.fluid.incubate.fleet.utils.http_server import KVServer
+        http_server = KVServer(int(self._http_ip_port[1]), size_d)
+        http_server.start()
+        wait_seconds = 5
+        while http_server_d.get("running",
+                                False) and not http_server.shoud_stop():
+            time.sleep(wait_seconds)
+        http_server.stop()
+
 
 class UserDefinedRoleMaker(RoleMakerBase):
     """
diff --git a/python/paddle/fluid/incubate/fleet/parameter_server/pslib/__init__.py b/python/paddle/fluid/incubate/fleet/parameter_server/pslib/__init__.py
index 210640f64c12c220304d31a5083de4e64756fd0d..c1ec749ac1fac35b9295689afa282adc765f49e8 100644
--- a/python/paddle/fluid/incubate/fleet/parameter_server/pslib/__init__.py
+++ b/python/paddle/fluid/incubate/fleet/parameter_server/pslib/__init__.py
@@ -567,6 +567,24 @@ class PSLib(Fleet):
                         model_proto_file, table_var_names, load_combine)
         self._role_maker._barrier_worker()
 
+    def confirm(self):
+        """
+        confirm all the updated params in current pass
+        """
+        self._role_maker._barrier_worker()
+        if self._role_maker.is_first_worker():
+            self._fleet_ptr.confirm()
+        self._role_maker._barrier_worker()
+
+    def revert(self):
+        """
+        revert all the updated params in current pass
+        """
+        self._role_maker._barrier_worker()
+        if self._role_maker.is_first_worker():
+            self._fleet_ptr.revert()
+        self._role_maker._barrier_worker()
+
     def load_model(self, model_dir=None, **kwargs):
         """
         load pslib model, there are at least 4 modes, these modes are the same
diff --git a/python/paddle/fluid/incubate/fleet/utils/http_server.py b/python/paddle/fluid/incubate/fleet/utils/http_server.py
new file mode 100644
index 0000000000000000000000000000000000000000..3573f417f3597d3feb1fbc4c1694f75b8e2086ce
--- /dev/null
+++ b/python/paddle/fluid/incubate/fleet/utils/http_server.py
@@ -0,0 +1,187 @@
+#   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.
+"""Http Server."""
+
+import logging
+import BaseHTTPServer
+import SimpleHTTPServer
+import time
+import threading
+import socket
+
+
+def get_logger(name, level, fmt):
+    logger = logging.getLogger(name)
+    logger.setLevel(level)
+    handler = logging.FileHandler('http.log', mode='w')
+    formatter = logging.Formatter(fmt=fmt)
+    handler.setFormatter(formatter)
+    logger.addHandler(handler)
+    return logger
+
+
+_http_server_logger = get_logger(
+    __name__, logging.INFO, fmt='%(asctime)s-%(levelname)s: %(message)s')
+
+
+class KVHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
+    """
+    kv handler class for kv http server,
+    it defines the way to get/set kv in server.
+    """
+
+    def do_GET(self):
+        """
+        get method for kv handler, get value according to key.
+        """
+        log_str = "GET " + self.address_string() + self.path
+        paths = self.path.split('/')
+        if len(paths) < 3:
+            print('len of request path must be 3: ' + self.path)
+            self.send_status_code(400)
+            return
+        _, scope, key = paths
+        with self.server.kv_lock:
+            value = self.server.kv.get(scope, {}).get(key)
+        if value is None:
+            log_str += ' , key not found: ' + key
+            self.send_status_code(404)
+        else:
+            log_str += ' , key found: ' + key
+            self.send_response(200)
+            self.send_header("Content-Length", str(len(value)))
+            self.end_headers()
+            self.wfile.write(value)
+        _http_server_logger.info(log_str)
+
+    def do_PUT(self):
+        """
+        put method for kv handler, set value according to key.
+        """
+        log_str = "PUT " + self.address_string() + self.path
+        paths = self.path.split('/')
+        if len(paths) < 3:
+            print('len of request path must be 3: ' + self.path)
+            self.send_status_code(400)
+            return
+        _, scope, key = paths
+        content_length = int(self.headers['Content-Length'])
+        try:
+            value = self.rfile.read(content_length)
+        except:
+            print("receive error invalid request")
+            self.send_status_code(404)
+            return
+        with self.server.kv_lock:
+            if self.server.kv.get(scope) is None:
+                self.server.kv[scope] = {}
+            self.server.kv[scope][key] = value
+        self.send_status_code(200)
+        _http_server_logger.info(log_str)
+
+    def do_DELETE(self):
+        """
+        delete method for kv handler, set value according to key.
+        """
+        log_str = "DELETE " + self.address_string() + self.path
+        paths = self.path.split('/')
+        if len(paths) < 3:
+            print('len of request path must be 3: ' + self.path)
+            self.send_status_code(400)
+            return
+        _, scope, key = paths
+        with self.server.delete_kv_lock:
+            if self.server.delete_kv.get(scope) is None:
+                self.server.delete_kv[scope] = []
+            self.server.delete_kv[scope].append(key)
+        self.send_status_code(200)
+        _http_server_logger.info(log_str)
+
+    def log_message(self, format, *args):
+        """
+        ignore all logging messages in kv handler.
+        """
+        pass
+
+    def send_status_code(self, code):
+        """
+        send status code back to client.
+        """
+        self.send_response(code)
+        self.send_header("Content-Length", 0)
+        self.end_headers()
+
+
+class KVHTTPServer(BaseHTTPServer.HTTPServer, object):
+    """
+    it is a http server storing kv pairs.
+    """
+
+    def __init__(self, port, handler):
+        """Init."""
+        super(KVHTTPServer, self).__init__(('', port), handler)
+        self.delete_kv_lock = threading.Lock()
+        self.delete_kv = {}
+        self.kv_lock = threading.Lock()
+        self.kv = {}
+
+    def get_deleted_size(self, key):
+        """
+        get deleted size in key.
+        """
+        ret = 0
+        with self.delete_kv_lock:
+            ret = self.delete_kv.get(key, 0)
+        return ret
+
+
+class KVServer:
+    """
+    it is a server storing kv pairs, has a http server inside.
+    """
+
+    def __init__(self, port, size={}):
+        """Init."""
+        self.http_server = KVHTTPServer(port, KVHandler)
+        self.listen_thread = None
+        self.size = {}
+
+    def start(self):
+        """
+        start server until user calls stop to let it quit.
+        """
+        self.listen_thread = threading.Thread(
+            target=lambda: self.http_server.serve_forever())
+        self.listen_thread.start()
+
+    def stop(self):
+        """
+        stop server and clear its resources.
+        """
+        self.http_server.shutdown()
+        self.listen_thread.join()
+        self.http_server.server_close()
+
+    def shoud_stop(self):
+        """
+        return whether the server should stop.
+
+        Returns:
+            ret(bool): whether the server should stop
+        """
+        for key in self.size:
+            s = self.http_server.get_deleted_size(key)
+            if s != self.size.get(key, 0):
+                return False
+        return True
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_nocvm_1.py b/python/paddle/fluid/tests/unittests/test_fleet_nocvm_1.py
index 5aa28673437b06de9376e1944a06d72f2668c385..a3038d1fb889d9fb40e30b4cebfad6db43de19b2 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_nocvm_1.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_nocvm_1.py
@@ -96,6 +96,8 @@ class TestFleet1(unittest.TestCase):
             fleet.save_one_table(0, "./model_002", prefix="hahaha")
             fleet.load_model("./model_0003")
             fleet.load_one_table(0, "./model_004")
+            fleet.confirm()
+            fleet.revert()
         except:
             print("do not support pslib test, skip")
             return
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_2.py b/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_2.py
index 5fee4458a715e9079d683cd59281280112ca563c..4e7de7c6ba0e861bccc550688c8bcaaf690cf34d 100644
--- a/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_2.py
+++ b/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_2.py
@@ -97,7 +97,7 @@ class TestCloudRoleMaker2(unittest.TestCase):
         role4._worker_gather(1)
         role4._get_rank()
         role4._get_size()
-        role4._all_comm.init(0, 0, "", "", "", "", "")
+        role4._all_comm.init()
         role5 = GeneralRoleMaker(path="./test_gloo_5")
         role5.get_local_endpoint()
         role5.get_local_endpoint()
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_3.py b/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_3.py
new file mode 100644
index 0000000000000000000000000000000000000000..be1e228f4364f365ecb9f8d20918f66585b8af59
--- /dev/null
+++ b/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_3.py
@@ -0,0 +1,84 @@
+#   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.
+"""Test cloud role maker."""
+
+from __future__ import print_function
+import os
+import unittest
+import paddle.fluid.incubate.fleet.base.role_maker as role_maker
+
+
+class TestCloudRoleMaker(unittest.TestCase):
+    """
+    Test cases for PaddleCloudRoleMaker.
+    """
+
+    def setUp(self):
+        """Set up, set envs."""
+        os.environ["PADDLE_TRAINERS_NUM"] = "2"
+        os.environ[
+            "PADDLE_PSERVERS_IP_PORT_LIST"] = "127.0.0.1:36001,127.0.0.2:36001"
+
+    def test_pslib_1(self):
+        """Test cases for pslib."""
+        import paddle.fluid as fluid
+        from paddle.fluid.incubate.fleet.parameter_server.pslib import fleet
+        from paddle.fluid.incubate.fleet.parameter_server.pslib import PSLib
+        from paddle.fluid.incubate.fleet.base.role_maker import GeneralRoleMaker
+        try:
+            import netifaces
+        except:
+            print("warning: no netifaces, skip test_pslib_1")
+            return
+        os.environ["POD_IP"] = "127.0.0.1"
+        os.environ["PADDLE_PORT"] = "36001"
+        os.environ["TRAINING_ROLE"] = "TRAINER"
+        os.environ["PADDLE_TRAINER_ENDPOINTS"] = "127.0.0.1:36001"
+        os.environ["PADDLE_PSERVERS_IP_PORT_LIST"] = "127.0.0.1:36002"
+        os.environ["PADDLE_TRAINER_ID"] = "0"
+        role_maker = GeneralRoleMaker(
+            init_timeout_seconds=100,
+            run_timeout_seconds=100,
+            http_ip_port="127.0.0.1:36003")
+        role_maker.generate_role()
+        place = fluid.CPUPlace()
+        exe = fluid.Executor(place)
+        fleet.init(role_maker)
+        train_program = fluid.Program()
+        startup_program = fluid.Program()
+        scope = fluid.Scope()
+        with fluid.program_guard(train_program, startup_program):
+            show = fluid.layers.data(name="show", shape=[-1, 1], \
+                dtype="float32", lod_level=1, append_batch_size=False)
+            fc = fluid.layers.fc(input=show, size=1, act=None)
+            label = fluid.layers.data(name="click", shape=[-1, 1], \
+                dtype="int64", lod_level=1, append_batch_size=False)
+            label_cast = fluid.layers.cast(label, dtype='float32')
+            cost = fluid.layers.log_loss(fc, label_cast)
+        try:
+            adam = fluid.optimizer.Adam(learning_rate=0.000005)
+            adam = fleet.distributed_optimizer(adam)
+            adam.minimize([cost], [scope])
+            fleet.run_server()
+            http_server_d = {}
+            http_server_d["running"] = False
+            size_d = {}
+            role_maker._GeneralRoleMaker__start_kv_server(http_server_d, size_d)
+        except:
+            print("do not support pslib test, skip")
+            return
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_4.py b/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_4.py
new file mode 100644
index 0000000000000000000000000000000000000000..dd5cd715ecd1ed9ebc30a22cb924255d278643ed
--- /dev/null
+++ b/python/paddle/fluid/tests/unittests/test_fleet_rolemaker_4.py
@@ -0,0 +1,196 @@
+#   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.
+"""Test cloud role maker."""
+
+from __future__ import print_function
+import os
+import unittest
+import paddle.fluid.incubate.fleet.base.role_maker as role_maker
+
+
+class TestCloudRoleMaker(unittest.TestCase):
+    """
+    Test cases for PaddleCloudRoleMaker.
+    """
+
+    def setUp(self):
+        """Set up, set envs."""
+        os.environ["PADDLE_TRAINERS_NUM"] = "2"
+        os.environ[
+            "PADDLE_PSERVERS_IP_PORT_LIST"] = "127.0.0.1:36001,127.0.0.2:36001"
+
+    def test_pslib_1(self):
+        """Test cases for pslib."""
+        import sys
+        import threading
+        import paddle.fluid as fluid
+        try:
+            from paddle.fluid.incubate.fleet.parameter_server.pslib import fleet
+            from paddle.fluid.incubate.fleet.parameter_server.pslib import PSLib
+            from paddle.fluid.incubate.fleet.base.role_maker import \
+                GeneralRoleMaker
+            from paddle.fluid.incubate.fleet.utils.http_server import KVHandler
+            from paddle.fluid.incubate.fleet.utils.http_server import KVServer
+            from paddle.fluid.incubate.fleet.utils.http_server import \
+                KVHTTPServer
+        except:
+            print("warning: no fleet, skip test_pslib_4")
+            return
+
+        try:
+            import netifaces
+        except:
+            print("warning: no netifaces, skip test_pslib_4")
+            return
+
+        class FakeStream():
+            """
+            it is a fake stream only for test.
+            """
+
+            def write(self, a):
+                """
+                write a to stream, do nothing
+
+                Args:
+                    a(str): the string to write
+                """
+                pass
+
+            def read(self, b):
+                """
+                read data of len b from stream, do nothing
+
+                Args:
+                    b(str): the len to read
+
+                Returns:
+                    c(str): the result
+                """
+                if b == 0:
+                    raise ValueError("this is only for test")
+                return "fake"
+
+        import os
+
+        try:
+
+            class TmpKVHander(KVHandler):
+                """
+                it is a fake handler only for this test case.
+                """
+
+                def __init__(self, server):
+                    """Init."""
+                    self.path = "a/b/c"
+                    self.server = server
+                    self.wfile = FakeStream()
+                    self.rfile = FakeStream()
+                    self.headers = {}
+                    self.headers['Content-Length'] = 0
+
+                def address_string(self):
+                    """
+                    fake address string, it will do nothing.
+                    """
+                    return "123"
+
+                def send_response(self, code):
+                    """
+                    fake send response, it will do nothing.
+
+                    Args:
+                        code(int): error code
+                    """
+                    pass
+
+                def send_header(self, a, b):
+                    """
+                    fake send header, it will do nothing.
+
+                    Args:
+                        a(str): some header
+                        b(str): some header
+                    """
+                    pass
+
+                def end_headers(self):
+                    """
+                    fake end header, it will do nothing.
+                    """
+                    pass
+        except:
+            print("warning: no KVHandler, skip test_pslib_4")
+            return
+
+        import sys
+
+        try:
+
+            class TmpServer(KVHTTPServer):
+                """
+                it is a fake server only for this test case.
+                """
+
+                def __init__(self):
+                    """Init."""
+                    self.delete_kv_lock = threading.Lock()
+                    self.delete_kv = {}
+                    self.kv_lock = threading.Lock()
+                    self.kv = {}
+        except:
+            print("warning: no KVHTTPServer, skip test_pslib_4")
+            return
+
+        try:
+
+            class TmpS(KVServer):
+                """
+                it is a fake server only for this test case.
+                """
+
+                def __init__(self):
+                    """Init."""
+                    self.http_server = TmpServer()
+                    self.listen_thread = None
+                    self.size = {}
+                    self.size["a"] = 999
+        except:
+            print("warning: no KVServer, skip test_pslib_4")
+            return
+
+        s = TmpServer()
+        h = TmpKVHander(s)
+        h.do_GET()
+        h.path = "a/b"
+        h.do_GET()
+        h.do_PUT()
+        h.do_DELETE()
+        h.path = "a/b/c"
+        s.kv["b"] = {}
+        s.kv["b"]["c"] = "456"
+        h.do_GET()
+        h.path = "a/d/e"
+        h.do_PUT()
+        h.headers['Content-Length'] = 1
+        h.do_PUT()
+        h.do_DELETE()
+        h.log_message("666")
+        s.get_deleted_size("haha")
+        s1 = TmpS()
+        s1.shoud_stop()
+
+
+if __name__ == "__main__":
+    unittest.main()