Mark BasicEstimator as deprecated

cluster-autoscaler/estimator/basic_estimator.go

@@ -21,14 +21,20 @@ import (
 	"fmt"
 	"math"
 
+	"github.com/golang/glog"
 	apiv1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/resource"
 	schedulercache "k8s.io/kubernetes/pkg/scheduler/cache"
 )
 
+const basicEstimatorDeprecationMessage = "WARNING: basic estimator is deprecated. It will be removed in Cluster Autoscaler 1.5."
+
 // BasicNodeEstimator estimates the number of needed nodes to handle the given amount of pods.
 // It will never overestimate the number of nodes but is quite likely to provide a number that
 // is too small.
+//
+// Deprecated.
+// TODO(aleksandra-malinowska): remove this in 1.5.
 type BasicNodeEstimator struct {
 	cpuSum      resource.Quantity
 	memorySum   resource.Quantity
@@ -38,6 +44,7 @@ type BasicNodeEstimator struct {
 
 // NewBasicNodeEstimator builds BasicNodeEstimator.
 func NewBasicNodeEstimator() *BasicNodeEstimator {
+	glog.Warning(basicEstimatorDeprecationMessage)
 	return &BasicNodeEstimator{
 		portSum:     make(map[int32]int),
 		FittingPods: make(map[*apiv1.Pod]struct{}),

cluster-autoscaler/estimator/estimator.go

@@ -19,6 +19,7 @@ package estimator
 import (
 	"fmt"
 
+	"github.com/golang/glog"
 	apiv1 "k8s.io/api/core/v1"
 	"k8s.io/autoscaler/cluster-autoscaler/simulator"
 	schedulercache "k8s.io/kubernetes/pkg/scheduler/cache"
@@ -31,25 +32,35 @@ const (
 	BinpackingEstimatorName = "binpacking"
 )
 
-// AvailableEstimators is a list of available estimators.
-var AvailableEstimators = []string{BasicEstimatorName, BinpackingEstimatorName}
+func deprecated(name string) string {
+	return fmt.Sprintf("%s (DEPRECATED)", name)
+}
 
+// AvailableEstimators is a list of available estimators.
+var AvailableEstimators = []string{BinpackingEstimatorName, deprecated(BasicEstimatorName)}
+
+// Estimator calculates the number of nodes of given type needed to schedule pods.
 type Estimator interface {
 	Estimate([]*apiv1.Pod, *schedulercache.NodeInfo, []*schedulercache.NodeInfo) int
 }
 
+// EstimatorBuilder creates a new estimator object.
 type EstimatorBuilder func(*simulator.PredicateChecker) Estimator
 
+// NewEstimatorBuilder creates a new estimator object from flag.
 func NewEstimatorBuilder(name string) (EstimatorBuilder, error) {
 	switch name {
-	case BasicEstimatorName:
-		return func(_ *simulator.PredicateChecker) Estimator {
-			return NewBasicNodeEstimator()
-		}, nil
 	case BinpackingEstimatorName:
 		return func(predicateChecker *simulator.PredicateChecker) Estimator {
 			return NewBinpackingNodeEstimator(predicateChecker)
 		}, nil
+	// Deprecated.
+	// TODO(aleksandra-malinowska): remove in 1.5.
+	case BasicEstimatorName:
+		glog.Warning(basicEstimatorDeprecationMessage)
+		return func(_ *simulator.PredicateChecker) Estimator {
+			return NewBasicNodeEstimator()
+		}, nil
 	}
 	return nil, fmt.Errorf("Unknown estimator: %s", name)
 }