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Refactoring of pod autoscaler controller

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This commit is contained in:
Piotr Szczesniak 2016-02-23 11:29:40 +01:00
parent b034050f6a
commit 762e155f3e
1 changed files with 27 additions and 20 deletions
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47
pkg/controller/podautoscaler/horizontal.go
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@ -231,26 +231,8 @@ func (a *HorizontalController) reconcileAutoscaler(hpa extensions.HorizontalPodA
desiredReplicas = hpa.Spec.MaxReplicas
}
}
rescale := false
if desiredReplicas != currentReplicas {
// Going down only if the usageRatio dropped significantly below the target
// and there was no rescaling in the last downscaleForbiddenWindow.
if desiredReplicas < currentReplicas &&
(hpa.Status.LastScaleTime == nil ||
hpa.Status.LastScaleTime.Add(downscaleForbiddenWindow).Before(timestamp)) {
rescale = true
}
// Going up only if the usage ratio increased significantly above the target
// and there was no rescaling in the last upscaleForbiddenWindow.
if desiredReplicas > currentReplicas &&
(hpa.Status.LastScaleTime == nil ||
hpa.Status.LastScaleTime.Add(upscaleForbiddenWindow).Before(timestamp)) {
rescale = true
}
}
rescale := shouldScale(hpa, currentReplicas, desiredReplicas, timestamp)
if rescale {
scale.Spec.Replicas = desiredReplicas
_, err = a.scaleNamespacer.Scales(hpa.Namespace).Update(hpa.Spec.ScaleRef.Kind, scale)
@ -265,6 +247,31 @@ func (a *HorizontalController) reconcileAutoscaler(hpa extensions.HorizontalPodA
desiredReplicas = currentReplicas
}
return a.updateStatus(hpa, currentReplicas, desiredReplicas, cpuCurrentUtilization, cmStatus, rescale)
}
func shouldScale(hpa extensions.HorizontalPodAutoscaler, currentReplicas, desiredReplicas int, timestamp time.Time) bool {
if desiredReplicas != currentReplicas {
// Going down only if the usageRatio dropped significantly below the target
// and there was no rescaling in the last downscaleForbiddenWindow.
if desiredReplicas < currentReplicas &&
(hpa.Status.LastScaleTime == nil ||
hpa.Status.LastScaleTime.Add(downscaleForbiddenWindow).Before(timestamp)) {
return true
}
// Going up only if the usage ratio increased significantly above the target
// and there was no rescaling in the last upscaleForbiddenWindow.
if desiredReplicas > currentReplicas &&
(hpa.Status.LastScaleTime == nil ||
hpa.Status.LastScaleTime.Add(upscaleForbiddenWindow).Before(timestamp)) {
return true
}
}
return false
}
func (a *HorizontalController) updateStatus(hpa extensions.HorizontalPodAutoscaler, currentReplicas, desiredReplicas int, cpuCurrentUtilization *int, cmStatus string, rescale bool) error {
hpa.Status = extensions.HorizontalPodAutoscalerStatus{
CurrentReplicas: currentReplicas,
DesiredReplicas: desiredReplicas,
@ -280,7 +287,7 @@ func (a *HorizontalController) reconcileAutoscaler(hpa extensions.HorizontalPodA
hpa.Status.LastScaleTime = &now
}
_, err = a.hpaNamespacer.HorizontalPodAutoscalers(hpa.Namespace).UpdateStatus(&hpa)
_, err := a.hpaNamespacer.HorizontalPodAutoscalers(hpa.Namespace).UpdateStatus(&hpa)
if err != nil {
a.eventRecorder.Event(&hpa, api.EventTypeWarning, "FailedUpdateStatus", err.Error())
return fmt.Errorf("failed to update status for %s: %v", hpa.Name, err)