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EvenPodsSpread: Define a new Predicate

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This commit is contained in:
Wei Huang 2019-04-30 16:13:45 -07:00
parent 1dac5fd14a
commit 08e7b3bacb
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GPG Key ID: BE5E9752F8B6E005
3 changed files with 25 additions and 1 deletions
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2
pkg/scheduler/algorithm/predicates/error.go
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@ -75,6 +75,8 @@ var (
ErrVolumeNodeConflict = newPredicateFailureError("VolumeNodeAffinityConflict", "node(s) had volume node affinity conflict")
// ErrVolumeBindConflict is used for VolumeBindingNoMatch predicate error.
ErrVolumeBindConflict = newPredicateFailureError("VolumeBindingNoMatch", "node(s) didn't find available persistent volumes to bind")
// ErrSpreadConstraintsNotMatch is used for EvenPodsSpread predicate error.
ErrSpreadConstraintsNotMatch = newPredicateFailureError("EvenPodsSpread", "node(s) didn't match pod topology spread constraints")
// ErrFakePredicate is used for test only. The fake predicates returning false also returns error
// as ErrFakePredicate.
ErrFakePredicate = newPredicateFailureError("FakePredicateError", "Nodes failed the fake predicate")

18
pkg/scheduler/algorithm/predicates/predicates.go
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@ -106,6 +106,8 @@ const (
CheckNodeDiskPressurePred = "CheckNodeDiskPressure"
// CheckNodePIDPressurePred defines the name of predicate CheckNodePIDPressure.
CheckNodePIDPressurePred = "CheckNodePIDPressure"
// EvenPodsSpreadPred defines the name of predicate EvenPodsSpread
EvenPodsSpreadPred = "EvenPodsSpread"
// DefaultMaxGCEPDVolumes defines the maximum number of PD Volumes for GCE
// GCE instances can have up to 16 PD volumes attached.
@ -148,7 +150,7 @@ var (
PodToleratesNodeTaintsPred, PodToleratesNodeNoExecuteTaintsPred, CheckNodeLabelPresencePred,
CheckServiceAffinityPred, MaxEBSVolumeCountPred, MaxGCEPDVolumeCountPred, MaxCSIVolumeCountPred,
MaxAzureDiskVolumeCountPred, MaxCinderVolumeCountPred, CheckVolumeBindingPred, NoVolumeZoneConflictPred,
CheckNodeMemoryPressurePred, CheckNodePIDPressurePred, CheckNodeDiskPressurePred, MatchInterPodAffinityPred}
CheckNodeMemoryPressurePred, CheckNodePIDPressurePred, CheckNodeDiskPressurePred, EvenPodsSpreadPred, MatchInterPodAffinityPred}
)
// FitPredicate is a function that indicates if a pod fits into an existing node.
@ -1712,3 +1714,17 @@ func (c *VolumeBindingChecker) predicate(pod *v1.Pod, meta PredicateMetadata, no
klog.V(5).Infof("All PVCs found matches for pod %v/%v, node %q", pod.Namespace, pod.Name, node.Name)
return true, nil, nil
}
// EvenPodsSpreadPredicate checks if a pod can be scheduled on a node which satisfies
// its topologySpreadConstraints.
func EvenPodsSpreadPredicate(pod *v1.Pod, meta PredicateMetadata, nodeInfo *schedulernodeinfo.NodeInfo) (bool, []PredicateFailureReason, error) {
node := nodeInfo.Node()
if node == nil {
return false, nil, fmt.Errorf("node not found")
}
constraints := getHardTopologySpreadConstraints(pod)
if len(constraints) == 0 {
return true, nil, nil
}
return true, nil, nil
}

6
pkg/scheduler/algorithmprovider/defaults/defaults.go
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@ -87,6 +87,12 @@ func ApplyFeatureGates() {
klog.Infof("TaintNodesByCondition is enabled, PodToleratesNodeTaints predicate is mandatory")
}
// Only register EvenPodsSpreadPredicate if the feature is enabled
if utilfeature.DefaultFeatureGate.Enabled(features.EvenPodsSpread) {
factory.InsertPredicateKeyToAlgorithmProviderMap(predicates.EvenPodsSpreadPred)
factory.RegisterFitPredicate(predicates.EvenPodsSpreadPred, predicates.EvenPodsSpreadPredicate)
}
// Prioritizes nodes that satisfy pod's resource limits
if utilfeature.DefaultFeatureGate.Enabled(features.ResourceLimitsPriorityFunction) {
klog.Infof("Registering resourcelimits priority function")