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Posted to notifications@dubbo.apache.org by "wuzhuoquan (via GitHub)" <gi...@apache.org> on 2023/04/10 10:02:40 UTC

[GitHub] [dubbo] wuzhuoquan opened a new issue, #12055: consumer 该如何设置才能支持 graceful shutdown?

wuzhuoquan opened a new issue, #12055:
URL: https://github.com/apache/dubbo/issues/12055

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   ## consumer 该如何设置才能支持 graceful shutdown?
   我在测试 dubbo3 的优雅下线，大概的架构入下
   ![image](https://user-images.githubusercontent.com/49891988/230879836-7b6e114c-96d6-4d32-aacd-57b18b11a2ba.png)
    通过 http 调 consumer 的 /sleep?seconds=xx 接口，consumer 会通过 dubbo 协议去调 provider ，provider sleep xx 秒之后返回 hostname
   通过 http 调 consumer 的 /middlesleep?seconds=xx 接口，consumer 会通过 dubbo 协议调到 middle，然后 middle 通过 dubbo 协议调到 provider，provider sleep xx 秒之后返回 hostname 给 middle 然后返回给 consumer
   
   然后根据 https://cn.dubbo.apache.org/zh-cn/overview/mannual/java-sdk/advanced-features-and-usage/others/graceful-shutdown/ 的配置我给每个服务都加了 
   
   ```
   server:
     shutdown: graceful
   ```
   但是在调用 /sleep 或者 /middlesleep 接口的时候，把 consumer 或者 middle 干掉，最终调用 http 的 curl 都不能正常取得返回结果？
   


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[GitHub] [dubbo] AlbumenJ commented on issue #12055: consumer 该如何设置才能支持 graceful shutdown?

Posted by "AlbumenJ (via GitHub)" <gi...@apache.org>.
AlbumenJ commented on issue #12055:
URL: https://github.com/apache/dubbo/issues/12055#issuecomment-1502552327

   优雅下线是服务端的行为，只有服务端才有下线一说。对于这个 case，consumer 如果要下线的话应该在前置的 http 流量那里进行摘除


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[GitHub] [dubbo] wuzhuoquan closed issue #12055: consumer 该如何设置才能支持 graceful shutdown?

Posted by "wuzhuoquan (via GitHub)" <gi...@apache.org>.
wuzhuoquan closed issue #12055: consumer 该如何设置才能支持 graceful shutdown?
URL: https://github.com/apache/dubbo/issues/12055


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[GitHub] [dubbo] wuzhuoquan commented on issue #12055: consumer 该如何设置才能支持 graceful shutdown?

Posted by "wuzhuoquan (via GitHub)" <gi...@apache.org>.
wuzhuoquan commented on issue #12055:
URL: https://github.com/apache/dubbo/issues/12055#issuecomment-1519021712

   > > consumer 对外提供服务的话
   > 
   > 这个已经是 provider 了，所以是需要按 provider 的视角去看的
   > 
   > > 总不能因为自己要实现平滑升级，就需要外部客户端必须要做重试机制。
   > 
   > 如果全链路都是 dubbo 的话，可以通过 dubbo 提前下线，等待一段时间后在关闭，这个是不需要考虑自己是服务端还是客户端的
   
   使用 3.2.0 测试，可以正常关闭同时作为 consumer 和 provider 的组件了，以上情况，无论是在关闭 provider、consumer、middle 的时候都可以正常返回数据了。


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[GitHub] [dubbo] AlbumenJ commented on issue #12055: consumer 该如何设置才能支持 graceful shutdown?

Posted by "AlbumenJ (via GitHub)" <gi...@apache.org>.
AlbumenJ commented on issue #12055:
URL: https://github.com/apache/dubbo/issues/12055#issuecomment-1505099151

   > consumer 对外提供服务的话
   
   这个已经是 provider 了，所以是需要按 provider 的视角去看的
   
   > 总不能因为自己要实现平滑升级，就需要外部客户端必须要做重试机制。
   
   如果全链路都是 dubbo 的话，可以通过 dubbo 提前下线，等待一段时间后在关闭，这个是不需要考虑自己是服务端还是客户端的


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[GitHub] [dubbo] wuzhuoquan commented on issue #12055: consumer 该如何设置才能支持 graceful shutdown?

Posted by "wuzhuoquan (via GitHub)" <gi...@apache.org>.
wuzhuoquan commented on issue #12055:
URL: https://github.com/apache/dubbo/issues/12055#issuecomment-1502593035

   > 
   那如果一个服务即作为 provider，又作为 consumer 的场景呢？
   


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[GitHub] [dubbo] wuzhuoquan commented on issue #12055: consumer 该如何设置才能支持 graceful shutdown?

Posted by "wuzhuoquan (via GitHub)" <gi...@apache.org>.
wuzhuoquan commented on issue #12055:
URL: https://github.com/apache/dubbo/issues/12055#issuecomment-1502625238

   > 优雅下线是服务端的行为，只有服务端才有下线一说。对于这个 case，consumer 如果要下线的话应该在前置的 http 流量那里进行摘除
   
   对于测试中的 /sleep 接口，consumer 到 provider，consumer 在收到 SIGTERM 之后，不等待 provider sleep 完成返回就断开了链接，但是这个时候没有退出，因为检测到还有请求没有完成，等待shutdown timewait 时间过去之后就直接退出，这个过程中 provider 还在 sleep，完成了之后返回，但是因为链接中断了导致返回不了，前面的 curl 命令在 consumer 退出了之后直接报返回为空。
   那么其实 consumer 在下线的时候，就是已经把正在等待 provider 处理完成的请求给抛弃掉了，如果要做到平滑，就需要外部调 consumer 的时候增加重试机制（dubbo 机制之外），consumer 对外提供服务的话，总不能因为自己要实现平滑升级，就需要外部客户端必须要做重试机制。


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