diff --git a/client/v3/config.go b/client/v3/config.go
index eaa409f0ff05..29726160852a 100644
--- a/client/v3/config.go
+++ b/client/v3/config.go
@@ -91,7 +91,10 @@ type Config struct {
 	// TODO: support custom balancer picker
 }
 
-type ClientConfig struct {
+// ConfigSpec is the configuration from users, which comes from command-line flags,
+// environment variables or config file. It is a fully declarative configuration,
+// and can be serialized & deserialized to/from JSON.
+type ConfigSpec struct {
 	Endpoints        []string      `json:"endpoints"`
 	RequestTimeout   time.Duration `json:"request-timeout"`
 	DialTimeout      time.Duration `json:"dial-timeout"`
diff --git a/etcdctl/ctlv3/command/global.go b/etcdctl/ctlv3/command/global.go
index e67ea84c91b3..57adae28f00a 100644
--- a/etcdctl/ctlv3/command/global.go
+++ b/etcdctl/ctlv3/command/global.go
@@ -88,7 +88,7 @@ func (*discardValue) String() string   { return "" }
 func (*discardValue) Set(string) error { return nil }
 func (*discardValue) Type() string     { return "" }
 
-func clientConfigFromCmd(cmd *cobra.Command) *clientv3.ClientConfig {
+func clientConfigFromCmd(cmd *cobra.Command) *clientv3.ConfigSpec {
 	lg, err := zap.NewProduction()
 	if err != nil {
 		cobrautl.ExitWithError(cobrautl.ExitError, err)
@@ -119,7 +119,7 @@ func clientConfigFromCmd(cmd *cobra.Command) *clientv3.ClientConfig {
 		grpclog.SetLoggerV2(grpclog.NewLoggerV2(io.Discard, io.Discard, os.Stderr))
 	}
 
-	cfg := &clientv3.ClientConfig{}
+	cfg := &clientv3.ConfigSpec{}
 	cfg.Endpoints, err = endpointsFromCmd(cmd)
 	if err != nil {
 		cobrautl.ExitWithError(cobrautl.ExitError, err)
@@ -150,7 +150,7 @@ func mustClientFromCmd(cmd *cobra.Command) *clientv3.Client {
 	return mustClient(cfg)
 }
 
-func mustClient(cc *clientv3.ClientConfig) *clientv3.Client {
+func mustClient(cc *clientv3.ConfigSpec) *clientv3.Client {
 	cfg, err := newClientCfg(cc.Endpoints, cc.DialTimeout, cc.KeepAliveTime, cc.KeepAliveTimeout, cc.Secure, cc.Auth)
 	if err != nil {
 		cobrautl.ExitWithError(cobrautl.ExitBadArgs, err)
diff --git a/etcdctl/ctlv3/command/make_mirror_command.go b/etcdctl/ctlv3/command/make_mirror_command.go
index 0604373b3e77..e93e108ea1d3 100644
--- a/etcdctl/ctlv3/command/make_mirror_command.go
+++ b/etcdctl/ctlv3/command/make_mirror_command.go
@@ -114,7 +114,7 @@ func makeMirrorCommandFunc(cmd *cobra.Command, args []string) {
 
 	auth := authDestCfg()
 
-	cc := &clientv3.ClientConfig{
+	cc := &clientv3.ConfigSpec{
 		Endpoints:        []string{args[0]},
 		DialTimeout:      dialTimeout,
 		KeepAliveTime:    keepAliveTime,
diff --git a/server/embed/config.go b/server/embed/config.go
index 2c86a29f9421..21218e66e1c0 100644
--- a/server/embed/config.go
+++ b/server/embed/config.go
@@ -517,7 +517,7 @@ func NewConfig() *Config {
 		V2Deprecation: config.V2_DEPR_DEFAULT,
 
 		DiscoveryCfg: v3discovery.DiscoveryConfig{
-			ClientConfig: clientv3.ClientConfig{
+			ConfigSpec: clientv3.ConfigSpec{
 				DialTimeout:      DefaultDiscoveryDialTimeout,
 				RequestTimeout:   DefaultDiscoveryRequestTimeOut,
 				KeepAliveTime:    DefaultDiscoveryKeepAliveTime,
diff --git a/server/etcdserver/api/v3discovery/discovery.go b/server/etcdserver/api/v3discovery/discovery.go
index 1a6e1d22638f..1c274cdba17f 100644
--- a/server/etcdserver/api/v3discovery/discovery.go
+++ b/server/etcdserver/api/v3discovery/discovery.go
@@ -55,8 +55,8 @@ var (
 )
 
 type DiscoveryConfig struct {
-	clientv3.ClientConfig `json:"client"`
-	Token                 string `json:"token"`
+	clientv3.ConfigSpec `json:"client"`
+	Token               string `json:"token"`
 }
 
 type memberInfo struct {
@@ -77,18 +77,18 @@ type clusterInfo struct {
 }
 
 // key prefix for each cluster: "/_etcd/registry/<ClusterToken>".
-func geClusterKeyPrefix(cluster string) string {
+func getClusterKeyPrefix(cluster string) string {
 	return path.Join(discoveryPrefix, cluster)
 }
 
 // key format for cluster size: "/_etcd/registry/<ClusterToken>/_config/size".
-func geClusterSizeKey(cluster string) string {
-	return path.Join(geClusterKeyPrefix(cluster), "_config/size")
+func getClusterSizeKey(cluster string) string {
+	return path.Join(getClusterKeyPrefix(cluster), "_config/size")
 }
 
 // key prefix for each member: "/_etcd/registry/<ClusterToken>/members".
 func getMemberKeyPrefix(clusterToken string) string {
-	return path.Join(geClusterKeyPrefix(clusterToken), "members")
+	return path.Join(getClusterKeyPrefix(clusterToken), "members")
 }
 
 // key format for each member: "/_etcd/registry/<ClusterToken>/members/<memberId>".
@@ -278,7 +278,7 @@ func (d *discovery) joinCluster(config string) (string, error) {
 }
 
 func (d *discovery) getClusterSize() (int, error) {
-	configKey := geClusterSizeKey(d.clusterToken)
+	configKey := getClusterSizeKey(d.clusterToken)
 	ctx, cancel := context.WithTimeout(context.Background(), d.cfg.RequestTimeout)
 	defer cancel()