diff --git a/paddle/fluid/distributed/fleet_executor/compute_interceptor.cc b/paddle/fluid/distributed/fleet_executor/compute_interceptor.cc
index 084e91c11caa7372fc079999aed279871cd96792..41c77c1ead045fd79eb43d7d8bd7e4472ebf58c1 100644
--- a/paddle/fluid/distributed/fleet_executor/compute_interceptor.cc
+++ b/paddle/fluid/distributed/fleet_executor/compute_interceptor.cc
@@ -46,6 +46,8 @@ void ComputeInterceptor::PrepareDeps() {
                           "Source ComputeInterceptor must run at least one "
                           "times, but now max_run_times=%ld",
                           node_->max_run_times()));
+    in_readys_.emplace(-1,
+                       std::make_pair(std::numeric_limits<int64_t>::max(), 0));
   }
 
   // If there is no downstream or every downstream is in different rank,
@@ -55,14 +57,17 @@ void ComputeInterceptor::PrepareDeps() {
 }
 
 void ComputeInterceptor::IncreaseReady(int64_t up_id) {
-  // source node has no upstream, data_is_ready is send by carrier or others
-  if (is_source_ && up_id == -1) return;
-
   auto it = in_readys_.find(up_id);
   PADDLE_ENFORCE_NE(it, in_readys_.end(),
                     platform::errors::NotFound(
                         "Cannot find upstream=%lld in in_readys.", up_id));
 
+  // source node has no upstream, data_is_ready is send by carrier or others
+  if (is_source_ && up_id == -1) {
+    it->second.second = GetTaskNode()->max_run_times();
+    return;
+  }
+
   auto max_ready_size = it->second.first;
   auto ready_size = it->second.second;
   ready_size += 1;
@@ -93,7 +98,11 @@ bool ComputeInterceptor::IsInputReady() {
   for (auto& ins : in_readys_) {
     auto ready_size = ins.second.second;
     // not ready, return false
-    if (ready_size == 0) return false;
+    if (ready_size == 0) {
+      VLOG(3) << "Interceptor " << GetInterceptorId()
+              << "'s upstreams aren't all ready.";
+      return false;
+    }
   }
   return true;
 }
@@ -103,14 +112,23 @@ bool ComputeInterceptor::CanWriteOutput() {
     auto max_buffer_size = outs.second.first;
     auto used_size = outs.second.second;
     // full, return false
-    if (used_size == max_buffer_size) return false;
+    if (used_size == max_buffer_size) {
+      VLOG(3) << "Interceptor " << GetInterceptorId()
+              << "'s out buffer is full.";
+      return false;
+    }
   }
   return true;
 }
 
 // only source node need reset
 bool ComputeInterceptor::ShouldReset() {
-  return is_source_ && (step_ == node_->max_run_times());
+  if (is_source_ && step_ == node_->max_run_times()) {
+    VLOG(3) << "Interceptor " << GetInterceptorId()
+            << " should reset for step: " << step_ << ".";
+    return true;
+  }
+  return false;
 }
 
 void ComputeInterceptor::SendDataReadyToDownStream() {
@@ -130,7 +148,8 @@ void ComputeInterceptor::SendDataReadyToDownStream() {
     InterceptorMessage ready_msg;
     ready_msg.set_message_type(DATA_IS_READY);
     VLOG(3) << "ComputeInterceptor " << interceptor_id_
-            << " Send data_is_ready msg to " << down_id;
+            << " Send data_is_ready msg to " << down_id
+            << " for step: " << step_;
     Send(down_id, ready_msg);
   }
 }
@@ -147,23 +166,43 @@ void ComputeInterceptor::ReplyCompletedToUpStream() {
             ready_size));
     ins.second.second = ready_size;
 
+    VLOG(3) << "ComputeInterceptor " << interceptor_id_
+            << " Reply data_is_useless msg to " << up_id
+            << " for step: " << step_;
+    if (up_id == -1) return;
+
     InterceptorMessage reply_msg;
     reply_msg.set_message_type(DATE_IS_USELESS);
-    VLOG(3) << "ComputeInterceptor " << interceptor_id_
-            << " Reply data_is_useless msg to " << up_id;
     Send(up_id, reply_msg);
   }
 }
 
 void ComputeInterceptor::RunOps() {
   VLOG(3) << "ComputeInterceptor " << interceptor_id_ << " running ops for the "
-          << step_ << " time.";
+          << step_ + 1 << " time.";
   for (auto op : node_->ops()) {
     op->Run(*microbatch_scopes_[step_ % node_->max_run_times()], place_);
   }
 }
 
 void ComputeInterceptor::Run() {
+  // If there is no limit, source interceptor can be executed
+  // an unlimited number of times.
+  // Now source node can only run max_run_times.
+  if (ShouldReset()) {
+    for (auto& out_buff : out_buffs_) {
+      // buffer is using
+      if (out_buff.second.second != 0) {
+        VLOG(3) << "Interceptor " << GetInterceptorId()
+                << " out buffer for downstream: " << out_buff.first
+                << "'s counter is: " << out_buff.second.second
+                << ". Cannot be reset.";
+        return;
+      }
+    }
+    step_ = 0;  // reset
+  }
+
   while (IsInputReady() && CanWriteOutput() && !ShouldReset()) {
     VLOG(3) << "id=" << GetInterceptorId() << " ComputeInterceptor running";
 
@@ -181,18 +220,6 @@ void ComputeInterceptor::Run() {
       StopCarrier();
     }
   }
-
-  // If there is no limit, source interceptor can be executed
-  // an unlimited number of times.
-  // Now source node can only run max_run_times.
-  if (ShouldReset()) {
-    for (auto& out_buff : out_buffs_) {
-      // buffer is using
-      if (out_buff.second.second != 0) return;
-    }
-    step_ = 0;  // reset
-    return;
-  }
 }
 
 void ComputeInterceptor::ReceivedStop(int64_t up_id) {
diff --git a/paddle/fluid/distributed/fleet_executor/fleet_executor.cc b/paddle/fluid/distributed/fleet_executor/fleet_executor.cc
index 3479157de5c454325c50bdc0dfea2bedf485d58b..3a823674d842c5a8e76d10d36b0e44dbeef90148 100644
--- a/paddle/fluid/distributed/fleet_executor/fleet_executor.cc
+++ b/paddle/fluid/distributed/fleet_executor/fleet_executor.cc
@@ -109,6 +109,15 @@ void FleetExecutor::Run() {
       message_bus_instance.IsInit(), true,
       platform::errors::Unavailable("MessageBus has not been init yet."));
   carrier_instance.Start();
+  for (auto* micro_scop : microbatch_scopes_) {
+    // By default, we should delete all kid scopes after run executor because
+    // some operators may create local scope when running, such as while_op.
+    // But when while_op also create a local executor to run it's sub block,
+    // the sub scopes it created should not be dropped immediately, because
+    // while_grad_op will use some variables created during while_op run, so
+    // we need to keep the kids and wait for the outer executor to drop them.
+    micro_scop->DropKids();
+  }
 }
 
 void FleetExecutor::CopyParameters(int microbatch_id,
diff --git a/paddle/fluid/distributed/fleet_executor/message_bus.cc b/paddle/fluid/distributed/fleet_executor/message_bus.cc
index 688a6f3a3882183c324d2b05062bf97b0b76602b..f087de69fa96b2861d916e28fa4f4a292f791401 100644
--- a/paddle/fluid/distributed/fleet_executor/message_bus.cc
+++ b/paddle/fluid/distributed/fleet_executor/message_bus.cc
@@ -14,6 +14,7 @@
 
 #include <chrono>
 #include <memory>
+#include <set>
 #include <thread>
 
 #include "paddle/fluid/distributed/fleet_executor/carrier.h"
@@ -56,11 +57,11 @@ void MessageBus::Init(
 bool MessageBus::IsInit() const { return is_init_; }
 
 MessageBus::~MessageBus() {
-  VLOG(3) << "Message bus releases resource.";
   // NOTE: fleet_executor inits carrier before message bus,
   // therefore the message bus's destructor will be called first
   Carrier& carrier = Carrier::Instance();
   carrier.Release();
+  VLOG(3) << "Message bus releases resource.";
 #if defined(PADDLE_WITH_DISTRIBUTE) && defined(PADDLE_WITH_PSCORE) && \
     !defined(PADDLE_WITH_ASCEND_CL)
   server_.Stop(1000);
@@ -90,6 +91,8 @@ bool MessageBus::Send(const InterceptorMessage& interceptor_message) {
                 << retry_time << " times retries.";
         return true;
       }
+      VLOG(3) << "Message bus sends failed, retry after 1 seconds.";
+      std::this_thread::sleep_for(std::chrono::milliseconds(1000));
     }
     VLOG(3) << "Message bus sends inter rank fail after 10 times retries.";
     return false;
@@ -121,16 +124,40 @@ void MessageBus::ListenPort() {
   brpc::ServerOptions options;
   options.idle_timeout_sec = -1;
   int retry_times = 0;
-  int interval = 1000;
+  int interval = 100;
   while (server_.Start(ip_for_brpc, &options) != 0) {
     ++retry_times;
     LOG(INFO) << "Message bus is retring for starting brpc for " << retry_times
               << " times. And will retry after " << interval / 1000
               << " seconds.";
     std::this_thread::sleep_for(std::chrono::milliseconds(interval));
-    interval += 2000;
+    interval += 500;
   }
   LOG(INFO) << "Message bus's listen port thread starts successful.";
+
+  std::set<int64_t> visit;
+  InterceptorMessage tmp_msg;
+  tmp_msg.set_ctrl_message(true);
+  for (auto pair : interceptor_id_to_rank_) {
+    if (rank_to_addr_.at(pair.second) == addr_) {
+      tmp_msg.set_src_id(pair.first);
+    }
+  }
+  for (auto pair : interceptor_id_to_rank_) {
+    int64_t rank = pair.second;
+    if (rank_to_addr_.at(rank) == addr_) {
+      continue;
+    }
+    tmp_msg.set_dst_id(pair.first);
+    if (visit.find(rank) == visit.end()) {
+      VLOG(3) << "Message bus is testing connection for rank: " << rank << ".";
+      visit.insert(rank);
+      while (!Send(tmp_msg)) {
+        std::this_thread::sleep_for(std::chrono::milliseconds(1000));
+      }
+      VLOG(3) << "Message bus has connected to rank: " << rank << ".";
+    }
+  }
 #else
   LOG(WARNING)
       << "Fleet executor's ListenPort() is a fake function when Paddle is "