BewareMyPower commented on code in PR #539:
URL: https://github.com/apache/pulsar-client-cpp/pull/539#discussion_r2871272118


##########
lib/ClientConnection.cc:
##########
@@ -603,15 +603,29 @@ void ClientConnection::handleResolve(ASIO_ERROR err, 
const tcp::resolver::result
         return;
     }
 
+    tcp::endpoint endpointToLog;
+    if (!results.empty()) {
+        endpointToLog = *results.begin();
+        LOG_DEBUG(cnxString_ << "Resolved " << results.size() << " endpoints");
+        for (const auto& endpoint : results) {
+            LOG_DEBUG(cnxString_ << "  " << 
endpoint.endpoint().address().to_string() << ":" << endpoint.endpoint().port());
+        }
+    }
+
     auto weakSelf = weak_from_this();
-    connectTimeoutTask_->setCallback([weakSelf](const PeriodicTask::ErrorCode& 
ec) {
+    connectTimeoutTask_->setCallback([weakSelf, endpointToLog](const 
PeriodicTask::ErrorCode& ec) {

Review Comment:
   Instead of capturing the 1st endpoint in the DNS results, it would be better 
to pass all endpoints and log them for failures.
   
   ```c++
   static std::ostream& operator<<(std::ostream& os, const 
tcp::resolver::results_type& results) {
       for (const auto& entry : results) {
           os << entry.endpoint() << " ";
       }
       return os;
   }
   ```
   
   ```c++
       connectTimeoutTask_->setCallback([weakSelf, results](const 
PeriodicTask::ErrorCode& ec) {
           /* ... */
   
           if (ptr->state_ != Ready) {
               LOG_ERROR(ptr->cnxString_ << "Connection to " << results << "was 
not established in "
                                         << 
ptr->connectTimeoutTask_->getPeriodMs() << " ms, close the socket");
   ```



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