SERVER-20752 improve NetworkInterfaceASIO logging

- add a log component for ASIO, make it a subcomponent of Network
- add additional LOG(2), and LOG(3) messages for tracing
- remove a few redundant log messages

1 files changed, 3 insertions, 1 deletions

diff --git a/src/mongo/executor/network_interface_asio_connect.cpp b/src/mongo/executor/network_interface_asio_connect.cpp
index 9d1634f47e8..cbe6451691f 100644
--- a/src/mongo/executor/network_interface_asio_connect.cpp
+++ b/src/mongo/executor/network_interface_asio_connect.cpp
@@ -26,7 +26,7 @@
  *    it in the license file.
  */
 
-#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kExecutor
+#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kASIO
 
 #include "mongo/platform/basic.h"
 
@@ -88,6 +88,8 @@ void NetworkInterfaceASIO::AsyncConnection::setServerProtocols(rpc::ProtocolSet
 }
 
 void NetworkInterfaceASIO::_connect(AsyncOp* op) {
+    log() << "Connecting to " << op->request().target.toString();
+
     tcp::resolver::query query(op->request().target.host(),
                                std::to_string(op->request().target.port()));
     // TODO: Investigate how we might hint or use shortcuts to resolve when possible.