If the API of a dependentservice is idempotent, that means it is safe to retry failed requests.
如果所依赖服务的API是幂等的，那就意味着可以安全地对失败请求进行重试。
2
By building simple services composed of a single host, rather then multiple dependent hosts, one can create replicated service instances that can survive host failures.
构建由单台主机构成的简单服务，而非多依赖的主机构成的服务，可以创建复制服务实例来抵御主机故障。
3
It is common during integration for interfaces to return unexpected results or to have a sequence of dependent calls from one service to another that requires a level of orchestration.