Merge pull request #1426 from IanCao/master

【issue】 #1425

api/src/main/java/com/alibaba/nacos/api/naming/NamingService.java

@@ -138,6 +138,14 @@ public interface NamingService {
      */
     void deregisterInstance(String serviceName, String groupName, String ip, int port, String clusterName) throws NacosException;
 
+    /**
+     * deregister instance with full instance information and default groupName
+     * @param serviceName
+     * @param instance
+     * @throws NacosException
+     */
+    void deregisterInstance(String serviceName, Instance instance) throws NacosException;
+
     /**
      * deregister instance with full instance information
      *

client/src/main/java/com/alibaba/nacos/client/naming/NacosNamingService.java

@@ -231,6 +231,11 @@ public class NacosNamingService implements NamingService {
         deregisterInstance(serviceName, groupName, instance);
     }
 
+    @Override
+    public void deregisterInstance(String serviceName, Instance instance) throws NacosException {
+        deregisterInstance(serviceName, Constants.DEFAULT_GROUP, instance);
+    }
+
     @Override
     public void deregisterInstance(String serviceName, String groupName, Instance instance) throws NacosException {
         beatReactor.removeBeatInfo(NamingUtils.getGroupedName(serviceName, groupName), instance.getIp(), instance.getPort());