dubbo泛化调用完成时，调用reference.destroy()后，com.alibaba.dubbo.common.URL依然没有回收

[robin977]

测试场景：
public void run(String addr,String targetMethod,String className,String version) {
GenericService object=null;
ApplicationConfig applicationConfig=new ApplicationConfig("job-consumer-application");
RegistryConfig registryConfig=new RegistryConfig();
registryConfig.setAddress(addr);
registryConfig.setProtocol("zookeeper");
applicationConfig.setRegistry(registryConfig);
ReferenceConfig reference = new ReferenceConfig();
reference.setApplication(applicationConfig);
reference.setRegistry(registryConfig);
reference.setGeneric(true);
reference.setInterface(targetObject);
reference.setVersion(version);
reference.setCheck(false);
object=reference.get();
Object result=null;
try {
result= object.$invoke(targetMethod, parameterTypes, args);
} catch (Throwable e) {
e.printStackTrace();
}finally {
reference.destroy();
}
}
此方法调用后，com.alibaba.dubbo.common.URL依然没有回收
AbstractRegistry的ConcurrentMap<URL, Map<String, List>> notified，这个集合没有remove操作，所以它一直在涨

[manzhizhen]

let me see