supernovaer commented on issue #715: http2 / grpc问题 URL: https://github.com/apache/incubator-brpc/issues/715#issuecomment-511739962 gdb断点看了下，进到H2StreamContext::ConsumeWindowSize这个函数的时候，第一个判断条件就没通过，_remote_window_left已经小于size了。  实际各个变量的情况如下图：  与H2StreamContext关联的H2Context对象_conn_ctx的_unack_local_settings里面初始化几个的window_size变量，值都是对的，是我通过h2_client_stream_window_size、h2_client_connection_window_size这两个gflag传进去的值，均>10M。 但是_remote_window_left的值却很小，百K级别，并且在第一次请求的时候，_remote_window_left就这么小了，导致一直报 ”remote_window_left is not enough“的错。 另外，每次请求虽然失败了，但最后还是触发了H2Context::OnSettings，从grpc server端ParseH2Settings(H2Settings* out, butil::IOBufBytesIterator& it, size_t n)这个函数也执行到了out->stream_window_size = value;这里，value也是M级别的，跟grpc server的配置是吻合的。 const int64_t window_diff = static_cast<int64_t>(_remote_settings.stream_window_size) - old_stream_window_size; window_diff的计算结果正常，也成功触发了AddWindowSize，但是下一次请求仍然是”remote_window_left is not enough“
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