[I] 【XDS】Dubbo xds 分享-3 [dubbo-spi-extensions]

Sun, 28 Jan 2024 19:28:39 -0800 


Tomoko-hjf opened a new issue, #282:
URL: https://github.com/apache/dubbo-spi-extensions/issues/282

   # Dubbo-xds 功能实现 RFC
   ## 整体流程
   
之前是借用原有的Directory在Router层面做改动实现xds功能，这样做可以完成路由匹配、流量切分等功能，但限制了安全、超时、重试、故障注入等功能的实现。
   
![image](https://github.com/apache/dubbo-spi-extensions/assets/53164956/17f91950-bde5-4307-9e57-efa8b4e1852e)
   新的方案会在更上层新定义了`XdsCluster`、`XdsClusterInvoker`、`XdsRegistry`等组件，以便更有限度实现复杂功能。
   
![image](https://github.com/apache/dubbo-spi-extensions/assets/53164956/067ed596-1f68-4b8b-b6be-8146b97aa1fa)
   现有逻辑
   
![image](https://github.com/apache/dubbo-spi-extensions/assets/53164956/2da5ddcb-ed3c-438e-99e1-4f564d151c81)
   ## 初始化链路
   
![image](https://github.com/apache/dubbo-spi-extensions/assets/53164956/1ad6d371-aaba-48c7-865d-533a7c3ac3a3)
   ## 调用链路
   
![image](https://github.com/apache/dubbo-spi-extensions/assets/53164956/2d42b189-053f-40c4-b8d4-a4a980dec635)
   ## 资源更新
   
![image](https://github.com/apache/dubbo-spi-extensions/assets/53164956/e740f573-fdf4-492e-92f7-d03d68617547)
   LDS 更新：更新 LDS 资源 -> 更新 RDS 资源 -> 更新 CDS 资源（订阅或取消订阅）；
   RDS 更新：更新 RDS 资源 -> 更新 CDS 资源（订阅或取消订阅）；
   CDS 更新：更新 CDS 资源 -> 更新对应的 EDS 资源；
   EDS 更新：更新 EDS 资源；
   


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