diff --git a/sermant-plugins/sermant-service-registry/spring-cloud-registry-plugin/src/main/java/io/sermant/registry/entity/GraceShutdownBehavior.java b/sermant-plugins/sermant-service-registry/spring-cloud-registry-plugin/src/main/java/io/sermant/registry/entity/GraceShutdownBehavior.java
index c66d6599cf..cda9b4e907 100644
--- a/sermant-plugins/sermant-service-registry/spring-cloud-registry-plugin/src/main/java/io/sermant/registry/entity/GraceShutdownBehavior.java
+++ b/sermant-plugins/sermant-service-registry/spring-cloud-registry-plugin/src/main/java/io/sermant/registry/entity/GraceShutdownBehavior.java
@@ -31,6 +31,7 @@
 import io.sermant.registry.services.GraceService;
 import io.sermant.registry.utils.CommonUtils;
 
+import java.time.LocalDateTime;
 import java.util.Locale;
 import java.util.logging.Logger;
 
@@ -72,7 +73,8 @@ private void graceShutDown() {
             CommonUtils.sleep(shutdownCheckTimeUnit);
             shutdownWaitTime -= shutdownCheckTimeUnit;
         }
-        System.out.println("shutdown: " + graceService.isCompleteNotify());
+        System.out.println(Thread.currentThread().getName() + LocalDateTime.now() + "shutdown: "
+                + graceService.isCompleteNotify());
         final int requestCount = GraceContext.INSTANCE.getGraceShutDownManager().getRequestCount();
         if (requestCount > 0) {
             LOGGER.warning(String.format(Locale.ENGLISH, "Request num that does not completed is [%s] ", requestCount));
diff --git a/sermant-plugins/sermant-service-registry/spring-cloud-registry-service/src/main/java/io/sermant/registry/service/impl/GraceServiceImpl.java b/sermant-plugins/sermant-service-registry/spring-cloud-registry-service/src/main/java/io/sermant/registry/service/impl/GraceServiceImpl.java
index 990f7441bd..5712526584 100644
--- a/sermant-plugins/sermant-service-registry/spring-cloud-registry-service/src/main/java/io/sermant/registry/service/impl/GraceServiceImpl.java
+++ b/sermant-plugins/sermant-service-registry/spring-cloud-registry-service/src/main/java/io/sermant/registry/service/impl/GraceServiceImpl.java
@@ -87,7 +87,8 @@ public void shutdown() {
                     Arrays.asList(clientInfo.getIp() + ":" + clientInfo.getPort(),
                             clientInfo.getHost() + ":" + clientInfo.getPort()));
             latch = new CountDownLatch(AddressCache.INSTANCE.getAddressSet().size());
-            System.out.println(LocalDateTime.now() + "latch count is " + latch.getCount());
+            System.out.println(
+                    Thread.currentThread().getName() + LocalDateTime.now() + "latch count is " + latch.getCount());
             AddressCache.INSTANCE.getAddressSet().forEach(address -> notifyToGraceHttpServer(address, header));
         }
     }
@@ -95,9 +96,10 @@ public void shutdown() {
     @Override
     public boolean isCompleteNotify() {
         if (latch == null) {
-            System.out.println(LocalDateTime.now() + "latch is null.");
+            System.out.println(Thread.currentThread().getName() + LocalDateTime.now() + "latch is null.");
         } else {
-            System.out.println(LocalDateTime.now() + "isCompleteNotify: " + latch.getCount());
+            System.out.println(
+                    Thread.currentThread().getName() + LocalDateTime.now() + "isCompleteNotify: " + latch.getCount());
         }
         return latch != null && latch.getCount() == 0;
     }
@@ -107,11 +109,12 @@ private void notifyToGraceHttpServer(String address, Map<String, Collection<Stri
         try {
             latch.await();
         } catch (InterruptedException e) {
-            System.out.println(LocalDateTime.now() + "Failed to wait notification.");
+            System.out.println(Thread.currentThread().getName() + LocalDateTime.now() + "Failed to wait notification.");
             LOGGER.log(Level.SEVERE, "Failed to wait notification.", e);
             return;
         }
-        System.out.println(LocalDateTime.now() + "Notify before shutdown successful.");
+        System.out.println(
+                Thread.currentThread().getName() + LocalDateTime.now() + "Notify before shutdown successful.");
         LOGGER.log(Level.INFO, "Notify before shutdown successful.");
     }
 
@@ -123,6 +126,7 @@ private void execute(String address, Map<String, Collection<String>> header) {
             if (result.getCode() == GraceConstants.GRACE_HTTP_SUCCESS_CODE) {
                 break;
             }
+            System.out.println("Failed to notify before shutdown, address: " + address);
             LOGGER.log(Level.WARNING, "Failed to notify before shutdown, address: {0}", address);
         }
         latch.countDown();
diff --git a/sermant-plugins/sermant-service-registry/spring-cloud-registry-service/src/main/java/io/sermant/registry/service/utils/HttpClientUtils.java b/sermant-plugins/sermant-service-registry/spring-cloud-registry-service/src/main/java/io/sermant/registry/service/utils/HttpClientUtils.java
index 560d2a3484..07e5089064 100644
--- a/sermant-plugins/sermant-service-registry/spring-cloud-registry-service/src/main/java/io/sermant/registry/service/utils/HttpClientUtils.java
+++ b/sermant-plugins/sermant-service-registry/spring-cloud-registry-service/src/main/java/io/sermant/registry/service/utils/HttpClientUtils.java
@@ -120,6 +120,12 @@ public HttpClientResult doPost(String url, String json, Map<String, Collection<S
             return result;
         } catch (IOException e) {
             LOGGER.log(Level.SEVERE, "Request submit error.Error info: ", e);
+            System.out.println("Request submit error.Error info");
+            e.printStackTrace();
+            return new HttpClientResult(HttpStatus.SC_INTERNAL_SERVER_ERROR);
+        } catch (Exception e) {
+            System.out.println("Request submit error.EEError info");
+            e.printStackTrace();
             return new HttpClientResult(HttpStatus.SC_INTERNAL_SERVER_ERROR);
         }
     }