grpc 报错 At least one of the completion queues must be frequently polled 如何改进, 给出cpp代码

以下是一个简单的gRPC服务器示例代码（C++），其中包含了正确处理CQ的示例：

#include <iostream>
#include <memory>
#include <string>
#include <grpcpp/grpcpp.h>
#include "my_service.grpc.pb.h"

using grpc::Server;
using grpc::ServerBuilder;
using grpc::ServerContext;
using grpc::Status;
using my_service::Request;
using my_service::Response;
using my_service::MyService;

class MyServiceImpl final : public MyService::Service {
    Status MyMethod(ServerContext* context, const Request* request,
                        Response* response) override {
        // Handle request
        return Status::OK;
    }
};

void RunServer() {
    std::string server_address("0.0.0.0:50051");
    MyServiceImpl service;

    grpc::EnableDefaultHealthCheckService(true);
    grpc::reflection::InitProtoReflectionServerBuilderPlugin();
    ServerBuilder builder;
    builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
    builder.RegisterService(&service);

    std::unique_ptr<Server> server(builder.BuildAndStart());
    std::cout << "Server listening on " << server_address << std::endl;

    while (true) {
        // Poll CQs frequently
        server->GetCompletionQueue()->Next();
    }
}

int main(int argc, char** argv) {
    RunServer();
    return 0;
}

在上面的代码中，我们使用了gRPC提供的`GetCompletionQueue()`方法来获取CQ，并在无限循环中调用其`Next()`方法来处理异步操作完成时的通知。这样可以确保及时处理异步操作完成时的通知，从而避免了"At least one of the completion queues must be frequently polled"错误的发生。

此外，我们还使用了gRPC提供的`EnableDefaultHealthCheckService()`和`reflection::InitProtoReflectionServerBuilderPlugin()`方法来启用默认健康检查服务和Proto Reflection服务，以提高服务器的可靠性和稳定性。