fix TODO one of min-available/max-available must be specified when create pdb

pkg/kubectl/pdb.go

@@ -18,7 +18,6 @@ package kubectl
 
 import (
 	"fmt"
-	"os"
 
 	policy "k8s.io/api/policy/v1beta1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -167,15 +166,6 @@ func (s *PodDisruptionBudgetV2Generator) StructuredGenerate() (runtime.Object, e
 		return nil, err
 	}
 
-	if len(s.MaxUnavailable) == 0 && len(s.MinAvailable) == 0 {
-		s.MinAvailable = "1"
-
-		// This behavior is intended for backward compatibility.
-		// TODO: remove in Kubernetes 1.8
-		fmt.Fprintln(os.Stderr, "Deprecated behavior in kubectl create pdb: Defaulting min-available to 1. "+
-			"Kubernetes 1.8 will remove this default, and one of min-available/max-available must be specified. ")
-	}
-
 	if len(s.MaxUnavailable) > 0 {
 		maxUnavailable := intstr.Parse(s.MaxUnavailable)
 		return &policy.PodDisruptionBudget{
@@ -213,6 +203,9 @@ func (s *PodDisruptionBudgetV2Generator) validate() error {
 	if len(s.Selector) == 0 {
 		return fmt.Errorf("a selector must be specified")
 	}
+	if len(s.MaxUnavailable) == 0 && len(s.MinAvailable) == 0 {
+		return fmt.Errorf("one of min-available/max-available must be specified")
+	}
 	if len(s.MaxUnavailable) > 0 && len(s.MinAvailable) > 0 {
 		return fmt.Errorf("min-available and max-unavailable cannot be both specified")
 	}