Change:
tc.runTest(t) } <ins> func TestUpscaleCapGreaterThanMaxReplicas(t *testing.T) { tc := testCase{ minReplicas:     1, maxReplicas:     20, initialReplicas: 3, // desiredReplicas would be 24 without maxReplicas desiredReplicas:     20, CPUTarget:           10, reportedLevels:      []uint64{100, 200, 300}, reportedCPURequests: []resource.Quantity{resource.MustParse("0.1"), resource.MustParse("0.1"), resource.MustParse("0.1")}, useMetricsAPI:       true, expectedConditions: statusOkWithOverrides(autoscalingv2.HorizontalPodAutoscalerCondition{ Type:   autoscalingv2.ScalingLimited, Status: v1.ConditionTrue, Reason: "ScaleUpLimit", }, autoscalingv2.HorizontalPodAutoscalerCondition{ Type:   autoscalingv2.ScalingLimited, Status: v1.ConditionTrue, Reason: "TooManyReplicas", }), } tc.runTest(t) } </ins> func TestConditionInvalidSelectorMissing(t *testing.T) { tc := testCase{ minReplicas:         1,

Discussion:
/kind bug What happened: Since upgrading to Kube 1.7.6, I'm seeing my HPAs scale above it's maxReplicas. Because of this, it's rapidly creating pods, then terminating them, and repeat. What you expected to happen: I expected the HPA to never exceed maxReplicas. How to reproduce it (as minimally and precisely as possible): The HPA is logging: This seems to happen with the deployment's is low, and the HPA shows the deployment using more than 175% of it's If I increase the deployment's to better match actual usage (so that the deployment is using 120% or less), it occurs much less often. I deliberately set the low, to ensure services were over provisioned during the first roll out of HPA. I think the switch in after should be converted to individual if() statements. Anything else we need to know?: I am only setting on the deployment, not Looking at the code in , the version that worked (1.6.2) would only scale up and down by 1. The 1.7.6+ code is attempting to scale up by a larger amount. The new code seems appropriate in large clusters, where maxReplicas is in the tens or hundreds. It doesn't seem appropriate for clusters where maxReplicas is in the single digits. Environment: Kubernetes version (use ): Client Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.2", GitCommit:"", GitTreeState:"clean", BuildDate:"2017-07-21T19:06:19Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"darwin/amd64"} Server Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.6", GitCommit:"", GitTreeState:"clean", BuildDate:"2017-09-14T06:36:08Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"} Cloud provider or hardware configuration**: AWS m4.2xlarge, 5 nodes OS (e.g. from /etc/os-release):Kernel (e.g. ):Install tools: kops Version 1.7.0 Others:
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Yeah, I think the bug is that we have a case short-circuiting another case.
I think your right - we are not checking whether . I submitted a diff with a fix and regression test.