fix metadata disable full scan

client.go

@@ -212,9 +212,13 @@ func NewClient(addrs []string, conf *Config) (Client, error) {
 
 	client.randomizeSeedBrokers(addrs)
 
+	for _, t := range conf.Metadata.InitialTopics {
+		client.metadataTopics[t] = none{}
+	}
+
 	if conf.Metadata.Full {
-		// do an initial fetch of all cluster metadata by specifying an empty list of topics
-		err := client.RefreshMetadata()
+		// do an initial fetch of cluster metadata
+		err := client.RefreshMetadata(conf.Metadata.InitialTopics...)
 		if err == nil {
 		} else if errors.Is(err, ErrLeaderNotAvailable) || errors.Is(err, ErrReplicaNotAvailable) || errors.Is(err, ErrTopicAuthorizationFailed) || errors.Is(err, ErrClusterAuthorizationFailed) {
 			// indicates that maybe part of the cluster is down, but is not fatal to creating the client

config.go

@@ -167,6 +167,10 @@ type Config struct {
 		// the broker may auto-create topics that we requested which do not already exist,
 		// if it is configured to do so (`auto.create.topics.enable` is true). Defaults to true.
 		AllowAutoTopicCreation bool
+
+		// Optional set of topics whose metadata will be fetched at startup. If empty it will default
+		// to fetch the metadata for all topics
+		InitialTopics []string
 	}
 
 	// Producer is the namespace for configuration related to producing messages,