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## 简介
Dubbo Spring Cloud 基于 Dubbo Spring Boot 2.7.1[1] 和 Spring Cloud 2.x 开发,无论开发人员是 Dubbo 用户还是 Spring Cloud 用户,
都能轻松地驾驭并以接近“零”成本的代价使应用向上迁移。Dubbo Spring Cloud 致力于简化 Cloud Native 开发成本,提高研发效能以及提升应用性能等目的。
Dubbo Spring Cloud 首个 Preview Release随同 Spring Cloud Alibaba `0.2.2.RELEASE``0.9.0.RELEASE` 一同发布[2]
分别对应 Spring Cloud Finchley[3] 与 Greenwich[4] (下文分别简称为 “F” 版 和 “G” 版) 。
## 功能
由于 Dubbo Spring Cloud 构建在原生的 Spring Cloud 之上,其服务治理方面的能力可认为是 Spring Cloud Plus
不仅完全覆盖 Spring Cloud 原生特性[5],而且提供更为稳定和成熟的实现,特性比对如下表所示:
| 功能组件 | Spring Cloud | Dubbo Spring Cloud |
| ---------------------------------------------------- | -------------------------------------- | ------------------------------------------------------ |
| 分布式配置Distributed configuration | Git、Zookeeper、Consul、JDBC | Spring Cloud 分布式配置 + Dubbo 配置中心[6] |
| 服务注册与发现Service registration and discovery | Eureka、Zookeeper、Consul | Spring Cloud 原生注册中心[7] + Dubbo 原生注册中[8] |
| 负载均衡Load balancing | Ribbon随机、轮询等算法 | Dubbo 内建实现(随机、轮询等算法 + 权重等特性) |
| 服务熔断Circuit Breakers | Spring Cloud Hystrix | Spring Cloud Hystrix + Alibaba Sentinel[9] 等 |
| 服务调用Service-to-service calls | Open Feign、`RestTemplate` | Spring Cloud 服务调用 + Dubbo `@Reference` |
| 链路跟踪Tracing | Spring Cloud Sleuth[10] + Zipkin[11] | Zipkin、opentracing 等 |
[1]: 从 2.7.0 开始Dubbo Spring Boot 与 Dubbo 在版本上保持一致
[2]: Preview releases of Spring Cloud Alibaba are available: 0.9.0, 0.2.2, and 0.1.2 - <https://spring.io/blog/2011/04/11/preview-releases-of-spring-cloud-alibaba-are-available-0-9-0-0-2-2-and-0-1-2>
[3]: 目前最新的 Spring Cloud “F” 版的版本为:`Finchley.SR2` - <https://cloud.spring.io/spring-cloud-static/Finchley.SR2/single/spring-cloud.html>
[4]: 当前Spring Cloud “G” 版为 `Greenwich.RELEASE`
[5]: Spring Cloud 特性列表 - <https://cloud.spring.io/spring-cloud-static/Greenwich.RELEASE/single/spring-cloud.html#_features>
[6]: Dubbo 2.7 开始支持配置中心,可自定义适配 - <http://dubbo.apache.org/zh-cn/docs/user/configuration/config-center.html>
[7]: Spring Cloud 原生注册中心,除 Eureka、Zookeeper、Consul 之外,还包括 Spring Cloud Alibaba 中的 Nacos
[8]: Dubbo 原生注册中心 - <http://dubbo.apache.org/zh-cn/docs/user/references/registry/introduction.html>
[9]: Alibaba SentinelSentinel 以流量为切入点,从流量控制、熔断降级、系统负载保护等多个维度保护服务的稳定性 - <https://github.com/alibaba/Sentinel/wiki/%E4%BB%8B%E7%BB%8D>,目前 Sentinel 已被 Spring Cloud 项目纳为 Circuit Breaker 的候选实现 - <https://spring.io/blog/2011/04/8/introducing-spring-cloud-circuit-breaker>
[10]:Spring Cloud Sleuth - <https://spring.io/projects/spring-cloud-sleuth>
[11]: Zipkin - <https://github.com/apache/incubator-zipkin>