chenBright commented on code in PR #2177:
URL: https://github.com/apache/brpc/pull/2177#discussion_r1148731172


##########
src/brpc/controller.cpp:
##########
@@ -749,9 +780,8 @@ void Controller::Call::OnComplete(
         // "single" streams are often maintained in a separate SocketMap and
         // different from the main socket as well.
         if (c->_stream_creator != NULL &&
-            does_error_affect_main_socket(error_code) &&
             (sending_sock == NULL || sending_sock->id() != peer_id)) {
-            Socket::SetFailed(peer_id);
+            maybe_block_server(error_code, c, c->_lb.get(), peer_id);
         }
         break;
     case CONNECTION_TYPE_POOLED:

Review Comment:
   有POOLED连接相关的改动吗?



##########
src/brpc/controller.cpp:
##########
@@ -719,6 +719,37 @@ inline bool does_error_affect_main_socket(int error_code) {
         error_code == EINVAL/*returned by connect "0.0.0.1"*/;
 }
 
+inline void maybe_block_server(int error_code, Controller* cntl, 
SharedLoadBalancer* lb, SocketId sock) {
+    if (!does_error_affect_main_socket(error_code)) {

Review Comment:
   连接超时的情况可以优化吗?



##########
src/brpc/controller.cpp:
##########
@@ -1033,7 +1054,13 @@ void Controller::IssueRPC(int64_t start_realtime_us) {
             { start_realtime_us, true,
               has_request_code(), _request_code, _accessed };
         LoadBalancer::SelectOut sel_out(&tmp_sock);
-        const int rc = _lb->SelectServer(sel_in, &sel_out);
+        int rc = _lb->SelectServer(sel_in, &sel_out);
+        if (rc == EHOSTDOWN) {
+            // If no server is available, include accessed server and try to 
SelectServer again
+            sel_in.excluded = NULL;

Review Comment:
   这样是不是就会选到期望要excluded的实例呢?这样合理吗?



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