func (a *memoryScaler) scale(groupMetadata string, nodes []*cluster.Node) (*scalerResult, error) {
plans, err := app.PlansList()
if err != nil {
return nil, errors.Wrap(err, "couldn't list plans")
}
var maxPlanMemory int64
for _, plan := range plans {
if plan.Memory > maxPlanMemory {
maxPlanMemory = plan.Memory
}
}
if maxPlanMemory == 0 {
var defaultPlan *app.Plan
defaultPlan, err = app.DefaultPlan()
if err != nil {
return nil, errors.Wrap(err, "couldn't get default plan")
}
maxPlanMemory = defaultPlan.Memory
}
chosenNodes, err := a.chooseNodeForRemoval(maxPlanMemory, groupMetadata, nodes)
if err != nil {
return nil, err
}
if chosenNodes != nil {
return &scalerResult{
ToRemove: chosenNodes,
Reason: fmt.Sprintf("containers can be distributed in only %d nodes", len(nodes)-len(chosenNodes)),
}, nil
}
memoryData, err := a.nodesMemoryData(nodes)
if err != nil {
return nil, err
}
canFitMax := false
var totalReserved, totalMem int64
for _, node := range nodes {
data := memoryData[node.Address]
if maxPlanMemory > data.maxMemory {
return nil, errors.Errorf("aborting, impossible to fit max plan memory of %d bytes, node max available memory is %d", maxPlanMemory, data.maxMemory)
}
totalReserved += data.reserved
totalMem += data.maxMemory
if data.available >= maxPlanMemory {
canFitMax = true
break
}
}
if canFitMax {
return &scalerResult{}, nil
}
nodesToAdd := int((totalReserved + maxPlanMemory) / totalMem)
if nodesToAdd == 0 {
return &scalerResult{}, nil
}
return &scalerResult{
ToAdd: nodesToAdd,
Reason: fmt.Sprintf("can't add %d bytes to an existing node", maxPlanMemory),
}, nil
}
func (a *memoryScaler) scale(event *autoScaleEvent, groupMetadata string, nodes []*cluster.Node) error {
plans, err := app.PlansList()
if err != nil {
return fmt.Errorf("couldn't list plans: %s", err)
}
var maxPlanMemory int64
for _, plan := range plans {
if plan.Memory > maxPlanMemory {
maxPlanMemory = plan.Memory
}
}
if maxPlanMemory == 0 {
defaultPlan, err := app.DefaultPlan()
if err != nil {
return fmt.Errorf("couldn't get default plan: %s", err)
}
maxPlanMemory = defaultPlan.Memory
}
chosenNode, err := a.choseNodeForRemoval(maxPlanMemory, groupMetadata, nodes)
if err != nil {
return fmt.Errorf("unable to choose node for removal: %s", err)
}
if chosenNode != nil {
event.updateNode(chosenNode)
err = event.update(scaleActionRemove, fmt.Sprintf("containers from %s can be distributed in cluster", chosenNode.Address))
if err != nil {
return err
}
a.logDebug("running event %q for %q: %s", event.Action, event.MetadataValue, event.Reason)
return a.removeNode(chosenNode)
}
memoryData, err := a.nodesMemoryData(a.provisioner, nodes)
if err != nil {
return err
}
canFitMax := false
for _, node := range nodes {
data := memoryData[node.Address]
a.logDebug("checking scale up, node %s, memory data: %#v", node.Address, data)
if maxPlanMemory > data.maxMemory {
return fmt.Errorf("aborting, impossible to fit max plan memory of %d bytes, node max available memory is %d", maxPlanMemory, data.maxMemory)
}
if data.available >= maxPlanMemory {
canFitMax = true
break
}
}
if canFitMax {
return nil
}
err = event.update(scaleActionAdd, fmt.Sprintf("can't add %d bytes to an existing node", maxPlanMemory))
if err != nil {
return err
}
a.logDebug("running event %q for %q: %s", event.Action, event.MetadataValue, event.Reason)
newNode, err := a.addNode(nodes)
if err != nil {
return err
}
event.updateNode(newNode)
return nil
}