Example #1
0
func (p *scaleoutCreator) computeWeight(name string, clusterData data.Shared) float64 {
	service, _ := srv.GetServiceByName(name)

	if res.AvailableResourcesService(name) < 1.0 {
		return 0.0
	}

	srvCores := service.Docker.CpusetCpus
	if srvCores != "" {
		if !res.CheckSpecificCoresAvailable(srvCores) {
			return 0.0
		}
	}

	policy := cfg.GetPolicy().Scaleout
	metrics := policy.Metrics
	analytics := policy.Analytics
	threshold := policy.Threshold
	weights := []float64{}

	for _, metric := range metrics {
		if value, ok := clusterData.Service[name].Data.BaseShared[metric]; ok {
			weights = append(weights, p.computeMetricWeight(value, threshold))
		}
	}

	for _, analytic := range analytics {
		if value, ok := clusterData.Service[name].Data.UserShared[analytic]; ok {
			weights = append(weights, p.computeMetricWeight(value, threshold))
		}
	}

	policyValue := utils.Mean(weights)

	return policyValue
}
Example #2
0
func (p *swapCreator) computeWeight(running string, candidate string, clusterData data.Shared) float64 {
	srv_run, _ := srv.GetServiceByName(running)
	srv_cand, _ := srv.GetServiceByName(candidate)
	nRun := len(srv_run.Instances.Running)
	baseServices := cfg.GetNodeConstraints().BaseServices

	if utils.ContainsString(baseServices, running) && nRun < 2 {
		return 0.0
	}

	// If the service has the resources to start without stopping the other
	// there is no reason to swap them
	if res.AvailableResourcesService(candidate) > 0 {
		return 0.0
	}

	// TODO now this works only with homogeneous containers
	// and taking into account only the CPUs. This is not a
	// a good thing, so in the feuture the swap policy should
	// be able to compare the resources needed by each containers
	// and evaulte if it is possible to swap a container with
	// more than one that is active, in order to obtain
	// the requested amount of resources.
	if srv_run.Docker.CPUnumber != srv_cand.Docker.CPUnumber {
		return 0.0
	}

	runShared := clusterData.Service[running]
	candShared := clusterData.Service[candidate]
	policy := cfg.GetPolicy().Swap
	metrics := policy.Metrics
	analytics := policy.Analytics
	threshold := policy.Threshold
	weights := []float64{}

	candValue := 0.0
	runValue := 0.0
	for _, metric := range metrics {
		if value, ok := candShared.Data.BaseShared[metric]; ok {
			candValue = value
		} else {
			candValue = -1.0
		}

		if value, ok := runShared.Data.BaseShared[metric]; ok {
			runValue = value
		} else {
			runValue = -1.0
		}

		if candValue != -1.0 && runValue != -1.0 {
			delta := candValue - runValue
			weight := math.Min(1.0, delta/threshold)
			weights = append(weights, weight)
		} else {
			log.WithFields(log.Fields{
				"metric":    metric,
				"running":   running,
				"candidate": candidate,
			}).Warnln("Cannot compare services: metric not present in both services")
		}
	}

	for _, analytic := range analytics {
		if value, ok := candShared.Data.UserShared[analytic]; ok {
			candValue = value
		} else {
			candValue = -1.0
		}

		if value, ok := runShared.Data.UserShared[analytic]; ok {
			runValue = value
		} else {
			runValue = -1.0
		}

		if candValue != -1.0 && runValue != -1.0 {
			delta := candValue - runValue
			weight := math.Min(1.0, delta/threshold)
			weights = append(weights, weight)
		} else {
			log.WithFields(log.Fields{
				"analytic":  analytic,
				"running":   running,
				"candidate": candidate,
			}).Warnln("Cannot compare services: analytic not present in both services")
		}
	}

	policyValue := math.Max(0.0, utils.Mean(weights))

	return policyValue
}