fix: scale to 1 rather than 0 on start

Author: alexec

CHANGELOG.md

@@ -1,5 +1,15 @@
 # Changelog
 
+## v0.0.13 (2021-05-18)
+
+ * [ea4e910](https://github.com/argoproj/argo-workflows/commit/ea4e910597a1de3a99406523fdab0feadf14a116) docs: updated CHANGELOG.md
+ * [6204cd1](https://github.com/argoproj/argo-workflows/commit/6204cd1b085b354647495ec9866b1629fc474eb4) fix: surface errors
+ * [c000e41](https://github.com/argoproj/argo-workflows/commit/c000e4152710e9a1a1d78516e396b3892ed55e7f) fix: make minReplicas required
+
+### Contributors
+
+ * Alex Collins
+
 ## v0.0.12 (2021-05-18)
 
  * [3089119](https://github.com/argoproj/argo-workflows/commit/3089119f0447727cd493b1116244d90ac6dc3a1e) fix: only terminate sidecars if the main container exit with code 0

api/v1alpha1/step_types.go

@@ -49,15 +49,15 @@ func (in *Step) GetTargetReplicas(scalingDelay, peekDelay time.Duration) int {
 	targetReplicas := in.Spec.CalculateReplicas(pending)
 
 	// do we need to peek? currentReplicas and targetReplicas must both be zero
-	if currentReplicas == 0 && targetReplicas == 0 && time.Since(lastScaledAt) > peekDelay {
+	if currentReplicas <= 0 && targetReplicas == 0 && time.Since(lastScaledAt) > peekDelay {
 		return 1
 	}
 
 	return targetReplicas
 }
 
 func RequeueAfter(currentReplicas, targetReplicas int, scalingDelay time.Duration) time.Duration {
-	if currentReplicas == 0 && targetReplicas == 0 {
+	if currentReplicas <= 0 && targetReplicas == 0 {
 		return scalingDelay
 	}
 	return 0

api/v1alpha1/step_types_test.go

@@ -17,7 +17,7 @@ func TestStep_GetTargetReplicas(t *testing.T) {
 	t.Run("Init", func(t *testing.T) {
 		t.Run("Min=0", func(t *testing.T) {
 			s := &Step{Spec: StepSpec{Scale: &Scale{MinReplicas: 0}}}
-			assert.Equal(t, 0, s.GetTargetReplicas(scalingDelay, peekDelay))
+			assert.Equal(t, 1, s.GetTargetReplicas(scalingDelay, peekDelay))
 		})
 		t.Run("Min=1", func(t *testing.T) {
 			s := &Step{Spec: StepSpec{Scale: &Scale{MinReplicas: 1}}}