func (d *DeploymentController) reconcileNewRC(allRCs []*api.ReplicationController, newRC *api.ReplicationController, deployment extensions.Deployment) (bool, error) {
if newRC.Spec.Replicas == deployment.Spec.Replicas {
// Scaling not required.
return false, nil
}
if newRC.Spec.Replicas > deployment.Spec.Replicas {
// Scale down.
_, err := d.scaleRCAndRecordEvent(newRC, deployment.Spec.Replicas, deployment)
return true, err
}
// Check if we can scale up.
maxSurge, isPercent, err := util.GetIntOrPercentValue(&deployment.Spec.Strategy.RollingUpdate.MaxSurge)
if err != nil {
return false, fmt.Errorf("invalid value for MaxSurge: %v", err)
}
if isPercent {
maxSurge = util.GetValueFromPercent(maxSurge, deployment.Spec.Replicas)
}
// Find the total number of pods
currentPodCount := deploymentUtil.GetReplicaCountForRCs(allRCs)
maxTotalPods := deployment.Spec.Replicas + maxSurge
if currentPodCount >= maxTotalPods {
// Cannot scale up.
return false, nil
}
// Scale up.
scaleUpCount := maxTotalPods - currentPodCount
// Do not exceed the number of desired replicas.
scaleUpCount = int(math.Min(float64(scaleUpCount), float64(deployment.Spec.Replicas-newRC.Spec.Replicas)))
newReplicasCount := newRC.Spec.Replicas + scaleUpCount
_, err = d.scaleRCAndRecordEvent(newRC, newReplicasCount, deployment)
return true, err
}
func (d *DeploymentController) reconcileOldRCs(allRCs []*api.ReplicationController, oldRCs []*api.ReplicationController, newRC *api.ReplicationController, deployment extensions.Deployment) (bool, error) {
oldPodsCount := deploymentUtil.GetReplicaCountForRCs(oldRCs)
if oldPodsCount == 0 {
// Cant scale down further
return false, nil
}
maxUnavailable, isPercent, err := util.GetIntOrPercentValue(&deployment.Spec.Strategy.RollingUpdate.MaxUnavailable)
if err != nil {
return false, fmt.Errorf("invalid value for MaxUnavailable: %v", err)
}
if isPercent {
maxUnavailable = util.GetValueFromPercent(maxUnavailable, deployment.Spec.Replicas)
}
// Check if we can scale down.
minAvailable := deployment.Spec.Replicas - maxUnavailable
// Find the number of ready pods.
readyPodCount, err := deploymentUtil.GetAvailablePodsForRCs(d.client, allRCs)
if err != nil {
return false, fmt.Errorf("could not find available pods: %v", err)
}
if readyPodCount <= minAvailable {
// Cannot scale down.
return false, nil
}
totalScaleDownCount := readyPodCount - minAvailable
for _, targetRC := range oldRCs {
if totalScaleDownCount == 0 {
// No further scaling required.
break
}
if targetRC.Spec.Replicas == 0 {
// cannot scale down this RC.
continue
}
// Scale down.
scaleDownCount := int(math.Min(float64(targetRC.Spec.Replicas), float64(totalScaleDownCount)))
newReplicasCount := targetRC.Spec.Replicas - scaleDownCount
_, err = d.scaleRCAndRecordEvent(targetRC, newReplicasCount, deployment)
if err != nil {
return false, err
}
totalScaleDownCount -= scaleDownCount
}
return true, err
}