NageNalock commented on issue #1120:
URL: https://github.com/apache/incubator-brpc/issues/1120#issuecomment-700414190
我这里还有其他问题.
当设置 event_dispatcher_num 等于 num_threads 时, 在代码中使用 channel 去请求后台 http_server,
会发不出去请求
brpc 接口代码
```c++
void Echo(google::protobuf::RpcController* cntl_base,
const HttpRequest*,
HttpResponse*,
google::protobuf::Closure* done) {
// This object helps you to call done->Run() in RAII style. If you
need
// to process the request asynchronously, pass done_guard.release().
brpc::ClosureGuard done_guard(done);
brpc::Controller* cntl =
static_cast<brpc::Controller*>(cntl_base);
butil::IOBufBuilder os;
// Fill response.
cntl->http_response().set_content_type("text/plain");
brpc::Controller c_cntl;
c_cntl.http_request().uri() = url;
c_cntl.http_request().set_method(brpc::HTTP_METHOD_POST);
c_cntl.request_attachment().append(cntl->request_attachment());
channel.CallMethod(NULL, &c_cntl, NULL, NULL, NULL);
if (c_cntl.Failed()) {
std::cerr << c_cntl.ErrorText() << std::endl;
os << c_cntl.ErrorText() << '\n';
cntl->SetFailed(c_cntl.ErrorText());
} else {
// os << "queries:";
for (brpc::URI::QueryIterator it =
cntl->http_request().uri().QueryBegin();
it != cntl->http_request().uri().QueryEnd(); ++it) {
os << ' ' << it->first << '=' << it->second;
}
os << c_cntl.response_attachment() << '\n';
}
os.move_to(cntl->response_attachment());
}
```
brpc启动命令(第一个参数是后台 server 接口)
```shell
./router_server xxx.xxx.xxx.xx:20002/echo -num_threads=24
-event_dispatcher_num=12
```
使用 curl 测试. 请求被阻塞住了, 经过抓包, brpc 没有发出 http 请求
当设置 num_threads 数量大于 event_dispatcher_num 时, 无该现象, 可正常收发请求
```shell
./router_server xxx.xxx.xxx.xx:20002/echo -num_threads=24
-event_dispatcher_num=12
```
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