jiangqiushi opened a new issue #1808:
URL: https://github.com/apache/servicecomb-java-chassis/issues/1808


   我们有个测试场景,一个客户端,一个nginx,两个网关(servicecomb 客户端),两个业务后台服务(servicecomb 
server),如下图所示:
   
![捕获](https://user-images.githubusercontent.com/19721172/83474887-adcfb180-a4bf-11ea-873d-ded2762b3df9.PNG)
   
   当ServiceComb Server1下线,集群处理能力降低了50%,和预期一致。
   但是当ServiceComb Server1重新上线后,在上线瞬间500ms内,tps又下降了40%。
   
![捕获1](https://user-images.githubusercontent.com/19721172/83475144-52ea8a00-a4c0-11ea-8310-21fd9a9660af.PNG)
   
   我的疑问:
   
   1. 服务上下线servicecomb客户端需要更新路由缓存吧?更新缓存会阻塞客户端请求吧?
   2. 服务上线后为什么在500ms内,处理能力下降了很多?


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