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| 1 | +/* |
| 2 | +Copyright 2024 The Kubernetes Authors. |
| 3 | +
|
| 4 | +Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | +you may not use this file except in compliance with the License. |
| 6 | +You may obtain a copy of the License at |
| 7 | +
|
| 8 | + http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | +
|
| 10 | +Unless required by applicable law or agreed to in writing, software |
| 11 | +distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | +See the License for the specific language governing permissions and |
| 14 | +limitations under the License. |
| 15 | +*/ |
| 16 | + |
| 17 | +package flowcontrol |
| 18 | + |
| 19 | +import ( |
| 20 | + "testing" |
| 21 | + "time" |
| 22 | + |
| 23 | + fcboot "k8s.io/apiserver/pkg/apis/flowcontrol/bootstrap" |
| 24 | + fqs "k8s.io/apiserver/pkg/util/flowcontrol/fairqueuing/queueset" |
| 25 | + testeventclock "k8s.io/apiserver/pkg/util/flowcontrol/fairqueuing/testing/eventclock" |
| 26 | + "k8s.io/apiserver/pkg/util/flowcontrol/metrics" |
| 27 | + "k8s.io/client-go/informers" |
| 28 | + clientsetfake "k8s.io/client-go/kubernetes/fake" |
| 29 | + |
| 30 | + flowcontrol "k8s.io/api/flowcontrol/v1" |
| 31 | +) |
| 32 | + |
| 33 | +func TestUpdateBorrowing(t *testing.T) { |
| 34 | + startTime := time.Now() |
| 35 | + clk, _ := testeventclock.NewFake(startTime, 0, nil) |
| 36 | + plcExempt := fcboot.MandatoryPriorityLevelConfigurationExempt |
| 37 | + plcHigh := fcboot.SuggestedPriorityLevelConfigurationWorkloadHigh |
| 38 | + plcMid := fcboot.SuggestedPriorityLevelConfigurationWorkloadLow |
| 39 | + plcLow := fcboot.MandatoryPriorityLevelConfigurationCatchAll |
| 40 | + plcs := []*flowcontrol.PriorityLevelConfiguration{plcHigh, plcExempt, plcMid, plcLow} |
| 41 | + fses := []*flowcontrol.FlowSchema{} |
| 42 | + k8sClient := clientsetfake.NewSimpleClientset(plcLow, plcExempt, plcHigh, plcMid) |
| 43 | + informerFactory := informers.NewSharedInformerFactory(k8sClient, 0) |
| 44 | + flowcontrolClient := k8sClient.FlowcontrolV1() |
| 45 | + serverCL := int(*plcHigh.Spec.Limited.NominalConcurrencyShares+ |
| 46 | + *plcMid.Spec.Limited.NominalConcurrencyShares+ |
| 47 | + *plcLow.Spec.Limited.NominalConcurrencyShares) * 6 |
| 48 | + config := TestableConfig{ |
| 49 | + Name: "test", |
| 50 | + Clock: clk, |
| 51 | + AsFieldManager: "testfm", |
| 52 | + FoundToDangling: func(found bool) bool { return !found }, |
| 53 | + InformerFactory: informerFactory, |
| 54 | + FlowcontrolClient: flowcontrolClient, |
| 55 | + ServerConcurrencyLimit: serverCL, |
| 56 | + ReqsGaugeVec: metrics.PriorityLevelConcurrencyGaugeVec, |
| 57 | + ExecSeatsGaugeVec: metrics.PriorityLevelExecutionSeatsGaugeVec, |
| 58 | + QueueSetFactory: fqs.NewQueueSetFactory(clk), |
| 59 | + } |
| 60 | + ctlr := newTestableController(config) |
| 61 | + _ = ctlr.lockAndDigestConfigObjects(plcs, fses) |
| 62 | + if ctlr.nominalCLSum != serverCL { |
| 63 | + t.Fatalf("Unexpected rounding: nominalCLSum=%d", ctlr.nominalCLSum) |
| 64 | + } |
| 65 | + stateExempt := ctlr.priorityLevelStates[plcExempt.Name] |
| 66 | + stateHigh := ctlr.priorityLevelStates[plcHigh.Name] |
| 67 | + stateMid := ctlr.priorityLevelStates[plcMid.Name] |
| 68 | + stateLow := ctlr.priorityLevelStates[plcLow.Name] |
| 69 | + |
| 70 | + // Scenario 1: everybody wants more than ServerConcurrencyLimit. |
| 71 | + // Test the case of exempt borrowing so much that less than minCL |
| 72 | + // is available to each non-exempt. |
| 73 | + stateExempt.seatDemandIntegrator.Set(float64(serverCL + 100)) |
| 74 | + stateHigh.seatDemandIntegrator.Set(float64(serverCL + 100)) |
| 75 | + stateMid.seatDemandIntegrator.Set(float64(serverCL + 100)) |
| 76 | + stateLow.seatDemandIntegrator.Set(float64(serverCL + 100)) |
| 77 | + clk.SetTime(startTime.Add(borrowingAdjustmentPeriod)) |
| 78 | + ctlr.updateBorrowing() |
| 79 | + if expected, actual := serverCL+100, stateExempt.currentCL; expected != actual { |
| 80 | + t.Errorf("Scenario 1: expected %d, got %d for exempt", expected, actual) |
| 81 | + } else { |
| 82 | + t.Logf("Scenario 1: expected and got %d for exempt", expected) |
| 83 | + } |
| 84 | + if expected, actual := stateHigh.minCL, stateHigh.currentCL; expected != actual { |
| 85 | + t.Errorf("Scenario 1: expected %d, got %d for hi", expected, actual) |
| 86 | + } else { |
| 87 | + t.Logf("Scenario 1: expected and got %d for hi", expected) |
| 88 | + } |
| 89 | + if expected, actual := stateMid.minCL, stateMid.currentCL; expected != actual { |
| 90 | + t.Errorf("Scenario 1: expected %d, got %d for mid", expected, actual) |
| 91 | + } else { |
| 92 | + t.Logf("Scenario 1: expected and got %d for mid", expected) |
| 93 | + } |
| 94 | + if expected, actual := stateLow.minCL, stateLow.currentCL; expected != actual { |
| 95 | + t.Errorf("Scenario 1: expected %d, got %d for lo", expected, actual) |
| 96 | + } else { |
| 97 | + t.Logf("Scenario 1: expected and got %d for lo", expected) |
| 98 | + } |
| 99 | + |
| 100 | + // Scenario 2: non-exempt want more than serverCL but get halfway between minCL and minCurrentCL. |
| 101 | + expectedHigh := (stateHigh.nominalCL + stateHigh.minCL) / 2 |
| 102 | + expectedMid := (stateMid.nominalCL + stateMid.minCL) / 2 |
| 103 | + expectedLow := (stateLow.nominalCL + stateLow.minCL) / 2 |
| 104 | + expectedExempt := serverCL - (expectedHigh + expectedMid + expectedLow) |
| 105 | + stateExempt.seatDemandIntegrator.Set(float64(expectedExempt)) |
| 106 | + clk.SetTime(startTime.Add(2 * borrowingAdjustmentPeriod)) |
| 107 | + ctlr.updateBorrowing() |
| 108 | + clk.SetTime(startTime.Add(3 * borrowingAdjustmentPeriod)) |
| 109 | + ctlr.updateBorrowing() |
| 110 | + if expected, actual := expectedExempt, stateExempt.currentCL; expected != actual { |
| 111 | + t.Errorf("Scenario 2: expected %d, got %d for exempt", expected, actual) |
| 112 | + } else { |
| 113 | + t.Logf("Scenario 2: expected and got %d for exempt", expected) |
| 114 | + } |
| 115 | + if expected, actual := expectedHigh, stateHigh.currentCL; expected != actual { |
| 116 | + t.Errorf("Scenario 2: expected %d, got %d for hi", expected, actual) |
| 117 | + } else { |
| 118 | + t.Logf("Scenario 2: expected and got %d for hi", expected) |
| 119 | + } |
| 120 | + if expected, actual := expectedMid, stateMid.currentCL; expected != actual { |
| 121 | + t.Errorf("Scenario 2: expected %d, got %d for mid", expected, actual) |
| 122 | + } else { |
| 123 | + t.Logf("Scenario 2: expected and got %d for mid", expected) |
| 124 | + } |
| 125 | + if expected, actual := expectedLow, stateLow.currentCL; expected != actual { |
| 126 | + t.Errorf("Scenario 2: expected %d, got %d for lo", expected, actual) |
| 127 | + } else { |
| 128 | + t.Logf("Scenario 2: expected and got %d for lo", expected) |
| 129 | + } |
| 130 | + |
| 131 | + // Scenario 3: only mid is willing to lend, and exempt borrows all of that. |
| 132 | + // Test the case of regular borrowing. |
| 133 | + expectedHigh = stateHigh.nominalCL |
| 134 | + expectedMid = stateMid.minCL |
| 135 | + expectedLow = stateLow.nominalCL |
| 136 | + expectedExempt = serverCL - (expectedHigh + expectedMid + expectedLow) |
| 137 | + stateExempt.seatDemandIntegrator.Set(float64(expectedExempt)) |
| 138 | + stateMid.seatDemandIntegrator.Set(float64(1)) |
| 139 | + clk.SetTime(startTime.Add(4 * borrowingAdjustmentPeriod)) |
| 140 | + ctlr.updateBorrowing() |
| 141 | + clk.SetTime(startTime.Add(5 * borrowingAdjustmentPeriod)) |
| 142 | + ctlr.updateBorrowing() |
| 143 | + if expected, actual := expectedExempt, stateExempt.currentCL; expected != actual { |
| 144 | + t.Errorf("Scenario 3: expected %d, got %d for exempt", expected, actual) |
| 145 | + } else { |
| 146 | + t.Logf("Scenario 3: expected and got %d for exempt", expected) |
| 147 | + } |
| 148 | + if expected, actual := expectedHigh, stateHigh.currentCL; expected != actual { |
| 149 | + t.Errorf("Scenario 3: expected %d, got %d for hi", expected, actual) |
| 150 | + } else { |
| 151 | + t.Logf("Scenario 3: expected and got %d for hi", expected) |
| 152 | + } |
| 153 | + if expected, actual := expectedMid, stateMid.currentCL; expected != actual { |
| 154 | + t.Errorf("Scenario 3: expected %d, got %d for mid", expected, actual) |
| 155 | + } else { |
| 156 | + t.Logf("Scenario 3: expected and got %d for mid", expected) |
| 157 | + } |
| 158 | + if expected, actual := expectedLow, stateLow.currentCL; expected != actual { |
| 159 | + t.Errorf("Scenario 3: expected %d, got %d for lo", expected, actual) |
| 160 | + } else { |
| 161 | + t.Logf("Scenario 3: expected and got %d for lo", expected) |
| 162 | + } |
| 163 | + |
| 164 | +} |
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