[GitHub] [incubator-brpc] lifeiyang commented on issue #1346: brpc 作为client 访问grpc server 返回Err=[E2004] remote_window_left is not enough

Mon, 01 Mar 2021 21:25:11 -0800 


lifeiyang commented on issue #1346:
URL: https://github.com/apache/incubator-brpc/issues/1346#issuecomment-788605487


   > 找一下grpc server的h2 window_size的配置，然后把这个值调大就可以了。你的场景应该是client向grpc 
server发大包，默认情况下server端这个窗口是很小的（64K），需要手动调大。
   grpc server 端把stream_window_size 调大也没有效果，还是没发多次发送大包（超过50KB）， brpc 
client这边的流控看着是connection 级别的 
remote_window_left限制的原因，个人理解，每个http2连接开始时应该先接收到服务端的setting确定接收方的流控窗口大小，settting 
初始化remote_window_left 如下代码所示：
   
![image](https://user-images.githubusercontent.com/3754939/109601722-55b30200-7b5a-11eb-9bf2-befbd9c316c9.png)
   图中所标注的代码行，为什么不直接写成如下：
   _remote_window_left.store(H2Settings::DEFAULT_INITIAL_WINDOW_SIZE, 
butil::memory_order_relaxed);
   @zyearn 麻烦大佬解惑，谢谢
   
   
   


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