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Trigger an explicit scale up error when expander filters out all scale-up options #7512

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Trigger an explicit scale up error when expander filters out all scale-up options #7512

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22 changes: 20 additions & 2 deletions cluster-autoscaler/core/scaleup/orchestrator/orchestrator.go
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Original file line number Diff line number Diff line change
Expand Up @@ -177,9 +177,10 @@ func (o *ScaleUpOrchestrator) ScaleUp(
// Pick some expansion option.
bestOption := o.autoscalingContext.ExpanderStrategy.BestOption(options, nodeInfos)
if bestOption == nil || bestOption.NodeCount <= 0 {
klog.Errorf("Expander filtered out all options, valid options: %d (this shouldn't happen)", len(options))
return &status.ScaleUpStatus{
Result: status.ScaleUpNoOptionsAvailable,
PodsRemainUnschedulable: GetRemainingPods(podEquivalenceGroups, skippedNodeGroups),
Result: status.ScaleUpError,
PodsRemainUnschedulable: getAllPods(podEquivalenceGroups, skippedNodeGroups),
ConsideredNodeGroups: nodeGroups,
}, nil
}
Expand Down Expand Up @@ -814,6 +815,23 @@ func GetRemainingPods(egs []*equivalence.PodGroup, skipped map[string]status.Rea
return remaining
}

// ExpandPodGrops flattens all equivalence groups into a list of NoScaleUpInfo
func getAllPods(egs []*equivalence.PodGroup, skipped map[string]status.Reasons) []status.NoScaleUpInfo {
podInfos := []status.NoScaleUpInfo{}
for _, eg := range egs {
for _, pod := range eg.Pods {
noScaleUpInfo := status.NoScaleUpInfo{
Pod: pod,
RejectedNodeGroups: eg.SchedulingErrors,
SkippedNodeGroups: skipped,
}
podInfos = append(podInfos, noScaleUpInfo)
}
}

return podInfos
}

// GetPodsAwaitingEvaluation returns list of pods for which CA was unable to help
// this scale up loop (but should be able to help).
func GetPodsAwaitingEvaluation(egs []*equivalence.PodGroup, bestOption string) []*apiv1.Pod {
Expand Down
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