Remove BalanceAttachedNodeVolumes

pkg/features/kube_features.go

@@ -249,14 +249,6 @@ const (
 	// volume limits
 	AttachVolumeLimit utilfeature.Feature = "AttachVolumeLimit"
 
-	// owner: @ravig
-	// alpha: v1.11
-	//
-	// Include volume count on node to be considered for balanced resource allocation while scheduling.
-	// A node which has closer cpu,memory utilization and volume count is favoured by scheduler
-	// while making decisions.
-	BalanceAttachedNodeVolumes utilfeature.Feature = "BalanceAttachedNodeVolumes"
-
 	// owner @freehan
 	// GA: v1.14
 	//
@@ -426,7 +418,6 @@ var defaultKubernetesFeatureGates = map[utilfeature.Feature]utilfeature.FeatureS
 	RunAsGroup:                              {Default: true, PreRelease: utilfeature.Beta},
 	CSIMigrationOpenStack:                   {Default: false, PreRelease: utilfeature.Alpha},
 	VolumeSubpath:                           {Default: true, PreRelease: utilfeature.GA},
-	BalanceAttachedNodeVolumes:              {Default: false, PreRelease: utilfeature.Alpha},
 	PodReadinessGates:                       {Default: true, PreRelease: utilfeature.GA, LockToDefault: true}, // remove in 1.16
 	VolumeSubpathEnvExpansion:               {Default: false, PreRelease: utilfeature.Alpha},
 	KubeletPluginsWatcher:                   {Default: true, PreRelease: utilfeature.GA, LockToDefault: true}, // remove in 1.16

pkg/scheduler/algorithm/predicates/predicates.go

@@ -519,12 +519,6 @@ func (c *MaxPDVolumeCountChecker) predicate(pod *v1.Pod, meta PredicateMetadata,
 		// violates MaxEBSVolumeCount or MaxGCEPDVolumeCount
 		return false, []PredicateFailureReason{ErrMaxVolumeCountExceeded}, nil
 	}
-	if nodeInfo != nil && nodeInfo.TransientInfo != nil && utilfeature.DefaultFeatureGate.Enabled(features.BalanceAttachedNodeVolumes) {
-		nodeInfo.TransientInfo.TransientLock.Lock()
-		defer nodeInfo.TransientInfo.TransientLock.Unlock()
-		nodeInfo.TransientInfo.TransNodeInfo.AllocatableVolumesCount = maxAttachLimit - numExistingVolumes
-		nodeInfo.TransientInfo.TransNodeInfo.RequestedVolumes = numNewVolumes
-	}
 	return true, nil, nil
 }
 

pkg/scheduler/algorithm/priorities/balanced_resource_allocation.go

@@ -19,8 +19,6 @@ package priorities
 import (
 	"math"
 
-	utilfeature "k8s.io/apiserver/pkg/util/feature"
-	"k8s.io/kubernetes/pkg/features"
 	schedulerapi "k8s.io/kubernetes/pkg/scheduler/api"
 	schedulernodeinfo "k8s.io/kubernetes/pkg/scheduler/nodeinfo"
 )
@@ -42,20 +40,6 @@ func balancedResourceScorer(requested, allocable *schedulernodeinfo.Resource, in
 	cpuFraction := fractionOfCapacity(requested.MilliCPU, allocable.MilliCPU)
 	memoryFraction := fractionOfCapacity(requested.Memory, allocable.Memory)
 	// This to find a node which has most balanced CPU, memory and volume usage.
-	if includeVolumes && utilfeature.DefaultFeatureGate.Enabled(features.BalanceAttachedNodeVolumes) && allocatableVolumes > 0 {
-		volumeFraction := float64(requestedVolumes) / float64(allocatableVolumes)
-		if cpuFraction >= 1 || memoryFraction >= 1 || volumeFraction >= 1 {
-			// if requested >= capacity, the corresponding host should never be preferred.
-			return 0
-		}
-		// Compute variance for all the three fractions.
-		mean := (cpuFraction + memoryFraction + volumeFraction) / float64(3)
-		variance := float64((((cpuFraction - mean) * (cpuFraction - mean)) + ((memoryFraction - mean) * (memoryFraction - mean)) + ((volumeFraction - mean) * (volumeFraction - mean))) / float64(3))
-		// Since the variance is between positive fractions, it will be positive fraction. 1-variance lets the
-		// score to be higher for node which has least variance and multiplying it with 10 provides the scaling
-		// factor needed.
-		return int64((1 - variance) * float64(schedulerapi.MaxPriority))
-	}
 
 	if cpuFraction >= 1 || memoryFraction >= 1 {
 		// if requested >= capacity, the corresponding host should never be preferred.

pkg/scheduler/algorithm/priorities/resource_allocation.go

@@ -20,9 +20,7 @@ import (
 	"fmt"
 
 	"k8s.io/api/core/v1"
-	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	"k8s.io/klog"
-	"k8s.io/kubernetes/pkg/features"
 	priorityutil "k8s.io/kubernetes/pkg/scheduler/algorithm/priorities/util"
 	schedulerapi "k8s.io/kubernetes/pkg/scheduler/api"
 	schedulernodeinfo "k8s.io/kubernetes/pkg/scheduler/nodeinfo"
@@ -58,31 +56,16 @@ func (r *ResourceAllocationPriority) PriorityMap(
 	requested.Memory += nodeInfo.NonZeroRequest().Memory
 	var score int64
 	// Check if the pod has volumes and this could be added to scorer function for balanced resource allocation.
-	if len(pod.Spec.Volumes) >= 0 && utilfeature.DefaultFeatureGate.Enabled(features.BalanceAttachedNodeVolumes) && nodeInfo.TransientInfo != nil {
-		score = r.scorer(&requested, &allocatable, true, nodeInfo.TransientInfo.TransNodeInfo.RequestedVolumes, nodeInfo.TransientInfo.TransNodeInfo.AllocatableVolumesCount)
-	} else {
-		score = r.scorer(&requested, &allocatable, false, 0, 0)
-	}
+	score = r.scorer(&requested, &allocatable, false, 0, 0)
 
 	if klog.V(10) {
-		if len(pod.Spec.Volumes) >= 0 && utilfeature.DefaultFeatureGate.Enabled(features.BalanceAttachedNodeVolumes) && nodeInfo.TransientInfo != nil {
-			klog.Infof(
-				"%v -> %v: %v, capacity %d millicores %d memory bytes, %d volumes, total request %d millicores %d memory bytes %d volumes, score %d",
-				pod.Name, node.Name, r.Name,
-				allocatable.MilliCPU, allocatable.Memory, nodeInfo.TransientInfo.TransNodeInfo.AllocatableVolumesCount,
-				requested.MilliCPU, requested.Memory,
-				nodeInfo.TransientInfo.TransNodeInfo.RequestedVolumes,
-				score,
-			)
-		} else {
-			klog.Infof(
-				"%v -> %v: %v, capacity %d millicores %d memory bytes, total request %d millicores %d memory bytes, score %d",
-				pod.Name, node.Name, r.Name,
-				allocatable.MilliCPU, allocatable.Memory,
-				requested.MilliCPU, requested.Memory,
-				score,
-			)
-		}
+		klog.Infof(
+			"%v -> %v: %v, capacity %d millicores %d memory bytes, total request %d millicores %d memory bytes, score %d",
+			pod.Name, node.Name, r.Name,
+			allocatable.MilliCPU, allocatable.Memory,
+			requested.MilliCPU, requested.Memory,
+			score,
+		)
 	}
 
 	return schedulerapi.HostPriority{

pkg/scheduler/internal/cache/cache.go

@@ -21,12 +21,10 @@ import (
 	"sync"
 	"time"
 
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/apimachinery/pkg/util/sets"
 	"k8s.io/apimachinery/pkg/util/wait"
-	utilfeature "k8s.io/apiserver/pkg/util/feature"
-	"k8s.io/kubernetes/pkg/features"
 	"k8s.io/kubernetes/pkg/scheduler/algorithm"
 	schedulernodeinfo "k8s.io/kubernetes/pkg/scheduler/nodeinfo"
 
@@ -210,7 +208,6 @@ func (cache *schedulerCache) Snapshot() *Snapshot {
 func (cache *schedulerCache) UpdateNodeInfoSnapshot(nodeSnapshot *NodeInfoSnapshot) error {
 	cache.mu.Lock()
 	defer cache.mu.Unlock()
-	balancedVolumesEnabled := utilfeature.DefaultFeatureGate.Enabled(features.BalanceAttachedNodeVolumes)
 
 	// Get the last generation of the the snapshot.
 	snapshotGeneration := nodeSnapshot.Generation
@@ -222,10 +219,6 @@ func (cache *schedulerCache) UpdateNodeInfoSnapshot(nodeSnapshot *NodeInfoSnapsh
 			// all the nodes are updated before the existing snapshot. We are done.
 			break
 		}
-		if balancedVolumesEnabled && node.info.TransientInfo != nil {
-			// Transient scheduler info is reset here.
-			node.info.TransientInfo.ResetTransientSchedulerInfo()
-		}
 		if np := node.info.Node(); np != nil {
 			nodeSnapshot.NodeInfoMap[np.Name] = node.info.Clone()
 		}

pkg/scheduler/nodeinfo/node_info.go

@@ -126,15 +126,6 @@ func NewTransientSchedulerInfo() *TransientSchedulerInfo {
 	return tsi
 }
 
-// ResetTransientSchedulerInfo resets the TransientSchedulerInfo.
-func (transientSchedInfo *TransientSchedulerInfo) ResetTransientSchedulerInfo() {
-	transientSchedInfo.TransientLock.Lock()
-	defer transientSchedInfo.TransientLock.Unlock()
-	// Reset TransientNodeInfo.
-	transientSchedInfo.TransNodeInfo.AllocatableVolumesCount = 0
-	transientSchedInfo.TransNodeInfo.RequestedVolumes = 0
-}
-
 // Resource is a collection of compute resource.
 type Resource struct {
 	MilliCPU         int64