Dubbo的负载均衡

和Dubbo其他的配置类似，多个配置是有覆盖关系的：

方法级优先，接口级次之，全局配置再次之。
如果级别一样，则消费方优先，提供方次之。
所以，上面4种配置的优先级是:

1. 客户端方法级别配置。
2. 客户端接口级别配置。
3. 服务端方法级别配置。
4. 服务端接口级别配置。

优先级应该是1->3->2->4

Locate the Dubbo documentation page covering load-balancing configuration and compare its stated precedence with the four levels listed in this issue. Confirm the intended order as 1→3→2→4, then update the relevant documentation and verify that the published wording is consistent.

Written by the indexing model from the issue text.