Fix sync connection client not removed.

common/src/main/java/com/alibaba/nacos/common/trace/event/TraceEvent.java

@@ -24,7 +24,10 @@ import com.alibaba.nacos.common.notify.Event;
  * @author yanda
  */
 public class TraceEvent extends Event {
-    private String type;
+    
+    private static final long serialVersionUID = -3065900892505697062L;
+    
+    private final String type;
     
     private final long eventTime;
     

core/src/main/java/com/alibaba/nacos/core/trace/NacosCombinedTraceSubscriber.java

@@ -74,14 +74,23 @@ public class NacosCombinedTraceSubscriber extends SmartSubscriber {
         if (null == subscribers) {
             return;
         }
+        TraceEvent traceEvent = (TraceEvent) event;
         for (NacosTraceSubscriber each : subscribers) {
-            try {
-                each.onEvent((TraceEvent) event);
-            } catch (Exception ignored) {
+            if (null != each.executor()) {
+                each.executor().execute(() -> onEvent0(each, traceEvent));
+            } else {
+                onEvent0(each, traceEvent);
             }
         }
     }
     
+    private void onEvent0(NacosTraceSubscriber subscriber, TraceEvent event) {
+        try {
+            subscriber.onEvent(event);
+        } catch (Exception ignored) {
+        }
+    }
+    
     public void shutdown() {
         NotifyCenter.deregisterSubscriber(this);
     }

core/src/test/java/com/alibaba/nacos/core/trace/NacosCombinedTraceSubscriberTest.java

@@ -29,17 +29,23 @@ import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
+import org.mockito.invocation.InvocationOnMock;
 import org.mockito.junit.MockitoJUnitRunner;
+import org.mockito.stubbing.Answer;
 import org.springframework.test.util.ReflectionTestUtils;
 
 import java.util.Collections;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
+import java.util.concurrent.Executor;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.doAnswer;
 import static org.mockito.Mockito.doThrow;
+import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
@@ -105,4 +111,21 @@ public class NacosCombinedTraceSubscriberTest {
         verify(mockSubscriber, never()).onEvent(event2);
         verify(mockSubscriber2, never()).onEvent(event2);
     }
+    
+    @Test
+    public void testOnEventWithExecutor() {
+        Executor executor = mock(Executor.class);
+        doAnswer(new Answer() {
+            @Override
+            public Object answer(InvocationOnMock invocationOnMock) throws Throwable {
+                invocationOnMock.getArgument(0, Runnable.class).run();
+                return null;
+            }
+        }).when(executor).execute(any(Runnable.class));
+        when(mockSubscriber.executor()).thenReturn(executor);
+        RegisterInstanceTraceEvent event = new RegisterInstanceTraceEvent(1L, "", true, "", "", "", "", 1);
+        combinedTraceSubscriber.onEvent(event);
+        verify(mockSubscriber).onEvent(event);
+        verify(mockSubscriber2).onEvent(event);
+    }
 }

naming/src/main/java/com/alibaba/nacos/naming/core/v2/client/factory/impl/ConnectionBasedClientFactory.java

@@ -46,7 +46,7 @@ public class ConnectionBasedClientFactory implements ClientFactory<ConnectionBas
     @Override
     public ConnectionBasedClient newSyncedClient(String clientId, ClientAttributes attributes) {
         long revision = attributes.getClientAttribute(REVISION, 0);
-        ConnectionBasedClient connectionBasedClient = new ConnectionBasedClient(clientId, true, revision);
+        ConnectionBasedClient connectionBasedClient = new ConnectionBasedClient(clientId, false, revision);
         connectionBasedClient.setAttributes(attributes);
         return connectionBasedClient;
     }