Fix typo

pkg/cluster/spec/validate.go

@@ -794,18 +794,18 @@ func (s *Specification) validateTLSEnabled() error {
 	return nil
 }
 
-func (s *Specification) validatePdPodNames() error {
-	// check pdserver pod name
-	if len(s.PDServers) > 1 {
-		cnt := make(map[string]int)
-		for _, pd := range s.PDServers {
-			if pd.Name != "" {
-				if cnt[pd.Name] > 0 {
-					return errors.Errorf("component pd_servers.name is not supported duplicated, the name %s is duplicated", pd.Name)
-				}
-				cnt[pd.Name]++
-			}
+func (s *Specification) validatePDNames() error {
+	// check pdserver name
+	pdNames := set.NewStringSet()
+	for _, pd := range s.PDServers {
+		if pd.Name == "" {
+			continue
+		}
+
+		if pdNames.Exist(pd.Name) {
+			return errors.Errorf("component pd_servers.name is not supported duplicated, the name %s is duplicated", pd.Name)
 		}
+		pdNames.Insert(pd.Name)
 	}
 	return nil
 }
@@ -833,7 +833,7 @@ func (s *Specification) Validate() error {
 		return err
 	}
 
-	if err := s.validatePdPodNames(); err != nil {
+	if err := s.validatePDNames(); err != nil {
 		return err
 	}