Hi,@carryxyh 

l meant  the  AbstractClusterInvoker (eg) not the AbstractLoadBalance.
Shall we go a little further?Move  prepositional logic into 
AbstractLoadBalance.select or remove completely ~

```java
       private Invoker<T> doSelect(LoadBalance loadbalance, Invocation 
invocation,
                                List<Invoker<T>> invokers, List<Invoker<T>> 
selected) throws RpcException {

        if (CollectionUtils.isEmpty(invokers)) {
            return null;
        }
        if (invokers.size() == 1) {
            return invokers.get(0);
        }
        Invoker<T> invoker = loadbalance.select(invokers, getUrl(), invocation);
```

[ Full content available at: 
https://github.com/apache/incubator-dubbo/issues/1861 ]
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