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stateful_set_control_test.go
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stateful_set_control_test.go
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/*
Copyright 2016 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package statefulset
import (
"context"
"errors"
"fmt"
"math/rand"
"reflect"
"runtime"
"sort"
"strconv"
"strings"
"sync"
"testing"
"time"
apps "k8s.io/api/apps/v1"
v1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/types"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/apimachinery/pkg/util/intstr"
utilfeature "k8s.io/apiserver/pkg/util/feature"
"k8s.io/client-go/informers"
appsinformers "k8s.io/client-go/informers/apps/v1"
clientset "k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/fake"
appslisters "k8s.io/client-go/listers/apps/v1"
corelisters "k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/tools/cache"
featuregatetesting "k8s.io/component-base/featuregate/testing"
podutil "k8s.io/kubernetes/pkg/api/v1/pod"
"k8s.io/kubernetes/pkg/controller"
"k8s.io/kubernetes/pkg/controller/history"
"k8s.io/kubernetes/pkg/features"
)
type invariantFunc func(set *apps.StatefulSet, om *fakeObjectManager) error
func setupController(client clientset.Interface) (*fakeObjectManager, *fakeStatefulSetStatusUpdater, StatefulSetControlInterface) {
informerFactory := informers.NewSharedInformerFactory(client, controller.NoResyncPeriodFunc())
om := newFakeObjectManager(informerFactory)
spc := NewStatefulPodControlFromManager(om, &noopRecorder{})
ssu := newFakeStatefulSetStatusUpdater(informerFactory.Apps().V1().StatefulSets())
ssc := NewDefaultStatefulSetControl(spc, ssu, history.NewFakeHistory(informerFactory.Apps().V1().ControllerRevisions()))
// The informer is not started. The tests here manipulate the local cache (indexers) directly, and there is no waiting
// for client state to sync. In fact, because the client is not updated during tests, informer updates will break tests
// by unexpectedly deleting objects.
//
// TODO: It might be better to rewrite all these tests manipulate the client an explicitly sync to ensure consistent
// state, or to create a fake client that does not use a local cache.
// The client is passed initial sets, so we have to put them in the local setsIndexer cache.
if sets, err := client.AppsV1().StatefulSets("").List(context.TODO(), metav1.ListOptions{}); err != nil {
panic(err)
} else {
for _, set := range sets.Items {
if err := om.setsIndexer.Update(&set); err != nil {
panic(err)
}
}
}
return om, ssu, ssc
}
func burst(set *apps.StatefulSet) *apps.StatefulSet {
set.Spec.PodManagementPolicy = apps.ParallelPodManagement
return set
}
func setMinReadySeconds(set *apps.StatefulSet, minReadySeconds int32) *apps.StatefulSet {
set.Spec.MinReadySeconds = minReadySeconds
return set
}
func runTestOverPVCRetentionPolicies(t *testing.T, testName string, testFn func(*testing.T, *apps.StatefulSetPersistentVolumeClaimRetentionPolicy)) {
subtestName := "StatefulSetAutoDeletePVCDisabled"
if testName != "" {
subtestName = fmt.Sprintf("%s/%s", testName, subtestName)
}
t.Run(subtestName, func(t *testing.T) {
featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.StatefulSetAutoDeletePVC, false)
testFn(t, &apps.StatefulSetPersistentVolumeClaimRetentionPolicy{
WhenScaled: apps.RetainPersistentVolumeClaimRetentionPolicyType,
WhenDeleted: apps.RetainPersistentVolumeClaimRetentionPolicyType,
})
})
for _, policy := range []*apps.StatefulSetPersistentVolumeClaimRetentionPolicy{
{
WhenScaled: apps.RetainPersistentVolumeClaimRetentionPolicyType,
WhenDeleted: apps.RetainPersistentVolumeClaimRetentionPolicyType,
},
{
WhenScaled: apps.DeletePersistentVolumeClaimRetentionPolicyType,
WhenDeleted: apps.RetainPersistentVolumeClaimRetentionPolicyType,
},
{
WhenScaled: apps.RetainPersistentVolumeClaimRetentionPolicyType,
WhenDeleted: apps.DeletePersistentVolumeClaimRetentionPolicyType,
},
{
WhenScaled: apps.DeletePersistentVolumeClaimRetentionPolicyType,
WhenDeleted: apps.DeletePersistentVolumeClaimRetentionPolicyType,
},
// tests the case when no policy is set.
nil,
} {
subtestName := pvcDeletePolicyString(policy) + "/StatefulSetAutoDeletePVCEnabled"
if testName != "" {
subtestName = fmt.Sprintf("%s/%s", testName, subtestName)
}
t.Run(subtestName, func(t *testing.T) {
featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.StatefulSetAutoDeletePVC, true)
testFn(t, policy)
})
}
}
func pvcDeletePolicyString(policy *apps.StatefulSetPersistentVolumeClaimRetentionPolicy) string {
if policy == nil {
return "nullPolicy"
}
const retain = apps.RetainPersistentVolumeClaimRetentionPolicyType
const delete = apps.DeletePersistentVolumeClaimRetentionPolicyType
switch {
case policy.WhenScaled == retain && policy.WhenDeleted == retain:
return "Retain"
case policy.WhenScaled == retain && policy.WhenDeleted == delete:
return "SetDeleteOnly"
case policy.WhenScaled == delete && policy.WhenDeleted == retain:
return "ScaleDownOnly"
case policy.WhenScaled == delete && policy.WhenDeleted == delete:
return "Delete"
}
return "invalid"
}
func TestStatefulSetControl(t *testing.T) {
simpleSetFn := func() *apps.StatefulSet { return newStatefulSet(3) }
largeSetFn := func() *apps.StatefulSet { return newStatefulSet(5) }
testCases := []struct {
fn func(*testing.T, *apps.StatefulSet, invariantFunc)
obj func() *apps.StatefulSet
}{
{CreatesPods, simpleSetFn},
{ScalesUp, simpleSetFn},
{ScalesDown, simpleSetFn},
{ReplacesPods, largeSetFn},
{RecreatesFailedPod, simpleSetFn},
{RecreatesSucceededPod, simpleSetFn},
{RecreatesFailedPodWithDeleteFailure, simpleSetFn},
{RecreatesSucceededPodWithDeleteFailure, simpleSetFn},
{CreatePodFailure, simpleSetFn},
{UpdatePodFailure, simpleSetFn},
{UpdateSetStatusFailure, simpleSetFn},
{NewRevisionDeletePodFailure, simpleSetFn},
{RecreatesPVCForPendingPod, simpleSetFn},
}
for _, testCase := range testCases {
fnName := runtime.FuncForPC(reflect.ValueOf(testCase.fn).Pointer()).Name()
if i := strings.LastIndex(fnName, "."); i != -1 {
fnName = fnName[i+1:]
}
testObj := testCase.obj
testFn := testCase.fn
runTestOverPVCRetentionPolicies(
t,
fmt.Sprintf("%s/Monotonic", fnName),
func(t *testing.T, policy *apps.StatefulSetPersistentVolumeClaimRetentionPolicy) {
set := testObj()
set.Spec.PersistentVolumeClaimRetentionPolicy = policy
testFn(t, set, assertMonotonicInvariants)
},
)
runTestOverPVCRetentionPolicies(
t,
fmt.Sprintf("%s/Burst", fnName),
func(t *testing.T, policy *apps.StatefulSetPersistentVolumeClaimRetentionPolicy) {
set := burst(testObj())
set.Spec.PersistentVolumeClaimRetentionPolicy = policy
testFn(t, set, assertBurstInvariants)
},
)
}
}
func CreatesPods(t *testing.T, set *apps.StatefulSet, invariants invariantFunc) {
client := fake.NewSimpleClientset(set)
om, _, ssc := setupController(client)
if err := scaleUpStatefulSetControl(set, ssc, om, invariants); err != nil {
t.Errorf("Failed to turn up StatefulSet : %s", err)
}
var err error
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
if set.Status.Replicas != 3 {
t.Error("Failed to scale statefulset to 3 replicas")
}
if set.Status.ReadyReplicas != 3 {
t.Error("Failed to set ReadyReplicas correctly")
}
if set.Status.UpdatedReplicas != 3 {
t.Error("Failed to set UpdatedReplicas correctly")
}
// Check all pods have correct pod index label.
if utilfeature.DefaultFeatureGate.Enabled(features.PodIndexLabel) {
selector, err := metav1.LabelSelectorAsSelector(set.Spec.Selector)
if err != nil {
t.Error(err)
}
pods, err := om.podsLister.Pods(set.Namespace).List(selector)
if err != nil {
t.Error(err)
}
if len(pods) != 3 {
t.Errorf("Expected 3 pods, got %d", len(pods))
}
for _, pod := range pods {
podIndexFromLabel, exists := pod.Labels[apps.PodIndexLabel]
if !exists {
t.Errorf("Missing pod index label: %s", apps.PodIndexLabel)
continue
}
podIndexFromName := strconv.Itoa(getOrdinal(pod))
if podIndexFromLabel != podIndexFromName {
t.Errorf("Pod index label value (%s) does not match pod index in pod name (%s)", podIndexFromLabel, podIndexFromName)
}
}
}
}
func ScalesUp(t *testing.T, set *apps.StatefulSet, invariants invariantFunc) {
client := fake.NewSimpleClientset(set)
om, _, ssc := setupController(client)
if err := scaleUpStatefulSetControl(set, ssc, om, invariants); err != nil {
t.Errorf("Failed to turn up StatefulSet : %s", err)
}
*set.Spec.Replicas = 4
if err := scaleUpStatefulSetControl(set, ssc, om, invariants); err != nil {
t.Errorf("Failed to scale StatefulSet : %s", err)
}
var err error
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
if set.Status.Replicas != 4 {
t.Error("Failed to scale statefulset to 4 replicas")
}
if set.Status.ReadyReplicas != 4 {
t.Error("Failed to set readyReplicas correctly")
}
if set.Status.UpdatedReplicas != 4 {
t.Error("Failed to set updatedReplicas correctly")
}
}
func ScalesDown(t *testing.T, set *apps.StatefulSet, invariants invariantFunc) {
client := fake.NewSimpleClientset(set)
om, _, ssc := setupController(client)
if err := scaleUpStatefulSetControl(set, ssc, om, invariants); err != nil {
t.Errorf("Failed to turn up StatefulSet : %s", err)
}
var err error
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
*set.Spec.Replicas = 0
if err := scaleDownStatefulSetControl(set, ssc, om, invariants); err != nil {
t.Errorf("Failed to scale StatefulSet : %s", err)
}
// Check updated set.
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
if set.Status.Replicas != 0 {
t.Error("Failed to scale statefulset to 0 replicas")
}
if set.Status.ReadyReplicas != 0 {
t.Error("Failed to set readyReplicas correctly")
}
if set.Status.UpdatedReplicas != 0 {
t.Error("Failed to set updatedReplicas correctly")
}
}
func ReplacesPods(t *testing.T, set *apps.StatefulSet, invariants invariantFunc) {
client := fake.NewSimpleClientset(set)
om, _, ssc := setupController(client)
if err := scaleUpStatefulSetControl(set, ssc, om, invariants); err != nil {
t.Errorf("Failed to turn up StatefulSet : %s", err)
}
var err error
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
if set.Status.Replicas != 5 {
t.Error("Failed to scale statefulset to 5 replicas")
}
selector, err := metav1.LabelSelectorAsSelector(set.Spec.Selector)
if err != nil {
t.Error(err)
}
claims, err := om.claimsLister.PersistentVolumeClaims(set.Namespace).List(selector)
if err != nil {
t.Error(err)
}
pods, err := om.podsLister.Pods(set.Namespace).List(selector)
if err != nil {
t.Error(err)
}
for _, pod := range pods {
podClaims := getPersistentVolumeClaims(set, pod)
for _, claim := range claims {
if _, found := podClaims[claim.Name]; found {
if hasOwnerRef(claim, pod) {
t.Errorf("Unexpected ownerRef on %s", claim.Name)
}
}
}
}
sort.Sort(ascendingOrdinal(pods))
om.podsIndexer.Delete(pods[0])
om.podsIndexer.Delete(pods[2])
om.podsIndexer.Delete(pods[4])
for i := 0; i < 5; i += 2 {
pods, err := om.podsLister.Pods(set.Namespace).List(selector)
if err != nil {
t.Error(err)
}
if _, err = ssc.UpdateStatefulSet(context.TODO(), set, pods); err != nil {
t.Errorf("Failed to update StatefulSet : %s", err)
}
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
if pods, err = om.setPodRunning(set, i); err != nil {
t.Error(err)
}
if _, err = ssc.UpdateStatefulSet(context.TODO(), set, pods); err != nil {
t.Errorf("Failed to update StatefulSet : %s", err)
}
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
if _, err = om.setPodReady(set, i); err != nil {
t.Error(err)
}
}
pods, err = om.podsLister.Pods(set.Namespace).List(selector)
if err != nil {
t.Error(err)
}
if _, err := ssc.UpdateStatefulSet(context.TODO(), set, pods); err != nil {
t.Errorf("Failed to update StatefulSet : %s", err)
}
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
if e, a := int32(5), set.Status.Replicas; e != a {
t.Errorf("Expected to scale to %d, got %d", e, a)
}
}
func recreatesPod(t *testing.T, set *apps.StatefulSet, invariants invariantFunc, terminalPhase v1.PodPhase, testDeletePodFailure bool) {
client := fake.NewSimpleClientset()
om, _, ssc := setupController(client)
expectedNumOfDeleteRequests := 0
selector, err := metav1.LabelSelectorAsSelector(set.Spec.Selector)
if err != nil {
t.Error(err)
}
pods, err := om.podsLister.Pods(set.Namespace).List(selector)
if err != nil {
t.Error(err)
}
if _, err := ssc.UpdateStatefulSet(context.TODO(), set, pods); err != nil {
t.Errorf("Error updating StatefulSet %s", err)
}
if err := invariants(set, om); err != nil {
t.Error(err)
}
if om.deletePodTracker.requests != expectedNumOfDeleteRequests {
t.Errorf("Found unexpected number of delete calls, got %v, expected 1", om.deletePodTracker.requests)
}
if pods, err = om.podsLister.Pods(set.Namespace).List(selector); err != nil {
t.Error(err)
}
terminalPodOrdinal := -1
for i, pod := range pods {
// Set at least Pending phase to acknowledge the creation of pods
newPhase := v1.PodPending
if i == 0 {
// Set terminal phase for the first pod
newPhase = terminalPhase
terminalPodOrdinal = getOrdinal(pod)
}
pod.Status.Phase = newPhase
if err = om.podsIndexer.Update(pod); err != nil {
t.Error(err)
}
}
if pods, err = om.podsLister.Pods(set.Namespace).List(selector); err != nil {
t.Error(err)
}
if testDeletePodFailure {
// Expect pod deletion failure
om.SetDeleteStatefulPodError(apierrors.NewInternalError(errors.New("API server failed")), 0)
expectedNumOfDeleteRequests++
if _, err = ssc.UpdateStatefulSet(context.TODO(), set, pods); !isOrHasInternalError(err) {
t.Errorf("StatefulSetControl did not return InternalError, found %s", err)
}
if err := invariants(set, om); err != nil {
t.Error(err)
}
if om.deletePodTracker.requests != expectedNumOfDeleteRequests {
t.Errorf("Found unexpected number of delete calls, got %v, expected %v", om.deletePodTracker.requests, expectedNumOfDeleteRequests)
}
if pods, err = om.podsLister.Pods(set.Namespace).List(selector); err != nil {
t.Error(err)
}
}
// Expect pod deletion
expectedNumOfDeleteRequests++
if _, err := ssc.UpdateStatefulSet(context.TODO(), set, pods); err != nil {
t.Errorf("Error updating StatefulSet %s", err)
}
if err := invariants(set, om); err != nil {
t.Error(err)
}
if om.deletePodTracker.requests != expectedNumOfDeleteRequests {
t.Errorf("Found unexpected number of delete calls, got %v, expected %v", om.deletePodTracker.requests, expectedNumOfDeleteRequests)
}
if pods, err = om.podsLister.Pods(set.Namespace).List(selector); err != nil {
t.Error(err)
}
// Expect no additional delete calls and expect pod creation
if _, err := ssc.UpdateStatefulSet(context.TODO(), set, pods); err != nil {
t.Errorf("Error updating StatefulSet %s", err)
}
if err := invariants(set, om); err != nil {
t.Error(err)
}
if om.deletePodTracker.requests != expectedNumOfDeleteRequests {
t.Errorf("Found unexpected number of delete calls, got %v, expected %v", om.deletePodTracker.requests, expectedNumOfDeleteRequests)
}
if pods, err = om.podsLister.Pods(set.Namespace).List(selector); err != nil {
t.Error(err)
}
recreatedPod := findPodByOrdinal(pods, terminalPodOrdinal)
// new recreated pod should have empty phase
if recreatedPod == nil || isCreated(recreatedPod) {
t.Error("StatefulSet did not recreate failed Pod")
}
expectedNumberOfCreateRequests := 2
if monotonic := !allowsBurst(set); !monotonic {
expectedNumberOfCreateRequests = int(*set.Spec.Replicas + 1)
}
if om.createPodTracker.requests != expectedNumberOfCreateRequests {
t.Errorf("Found unexpected number of create calls, got %v, expected %v", om.deletePodTracker.requests, expectedNumberOfCreateRequests)
}
}
func RecreatesFailedPod(t *testing.T, set *apps.StatefulSet, invariants invariantFunc) {
recreatesPod(t, set, invariants, v1.PodFailed, false)
}
func RecreatesSucceededPod(t *testing.T, set *apps.StatefulSet, invariants invariantFunc) {
recreatesPod(t, set, invariants, v1.PodSucceeded, false)
}
func RecreatesFailedPodWithDeleteFailure(t *testing.T, set *apps.StatefulSet, invariants invariantFunc) {
recreatesPod(t, set, invariants, v1.PodFailed, true)
}
func RecreatesSucceededPodWithDeleteFailure(t *testing.T, set *apps.StatefulSet, invariants invariantFunc) {
recreatesPod(t, set, invariants, v1.PodSucceeded, true)
}
func CreatePodFailure(t *testing.T, set *apps.StatefulSet, invariants invariantFunc) {
client := fake.NewSimpleClientset(set)
om, _, ssc := setupController(client)
om.SetCreateStatefulPodError(apierrors.NewInternalError(errors.New("API server failed")), 2)
if err := scaleUpStatefulSetControl(set, ssc, om, invariants); !isOrHasInternalError(err) {
t.Errorf("StatefulSetControl did not return InternalError, found %s", err)
}
// Update so set.Status is set for the next scaleUpStatefulSetControl call.
var err error
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
if err := scaleUpStatefulSetControl(set, ssc, om, invariants); err != nil {
t.Errorf("Failed to turn up StatefulSet : %s", err)
}
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
if set.Status.Replicas != 3 {
t.Error("Failed to scale StatefulSet to 3 replicas")
}
if set.Status.ReadyReplicas != 3 {
t.Error("Failed to set readyReplicas correctly")
}
if set.Status.UpdatedReplicas != 3 {
t.Error("Failed to updatedReplicas correctly")
}
}
func UpdatePodFailure(t *testing.T, set *apps.StatefulSet, invariants invariantFunc) {
client := fake.NewSimpleClientset(set)
om, _, ssc := setupController(client)
om.SetUpdateStatefulPodError(apierrors.NewInternalError(errors.New("API server failed")), 0)
// have to have 1 successful loop first
if err := scaleUpStatefulSetControl(set, ssc, om, invariants); err != nil {
t.Fatalf("Unexpected error: %v", err)
}
var err error
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
if set.Status.Replicas != 3 {
t.Error("Failed to scale StatefulSet to 3 replicas")
}
if set.Status.ReadyReplicas != 3 {
t.Error("Failed to set readyReplicas correctly")
}
if set.Status.UpdatedReplicas != 3 {
t.Error("Failed to set updatedReplicas correctly")
}
// now mutate a pod's identity
pods, err := om.podsLister.List(labels.Everything())
if err != nil {
t.Fatalf("Error listing pods: %v", err)
}
if len(pods) != 3 {
t.Fatalf("Expected 3 pods, got %d", len(pods))
}
sort.Sort(ascendingOrdinal(pods))
pods[0].Name = "goo-0"
om.podsIndexer.Update(pods[0])
// now it should fail
if _, err := ssc.UpdateStatefulSet(context.TODO(), set, pods); !isOrHasInternalError(err) {
t.Errorf("StatefulSetControl did not return InternalError, found %s", err)
}
}
func UpdateSetStatusFailure(t *testing.T, set *apps.StatefulSet, invariants invariantFunc) {
client := fake.NewSimpleClientset(set)
om, ssu, ssc := setupController(client)
ssu.SetUpdateStatefulSetStatusError(apierrors.NewInternalError(errors.New("API server failed")), 2)
if err := scaleUpStatefulSetControl(set, ssc, om, invariants); !isOrHasInternalError(err) {
t.Errorf("StatefulSetControl did not return InternalError, found %s", err)
}
// Update so set.Status is set for the next scaleUpStatefulSetControl call.
var err error
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
if err := scaleUpStatefulSetControl(set, ssc, om, invariants); err != nil {
t.Errorf("Failed to turn up StatefulSet : %s", err)
}
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
if set.Status.Replicas != 3 {
t.Error("Failed to scale StatefulSet to 3 replicas")
}
if set.Status.ReadyReplicas != 3 {
t.Error("Failed to set readyReplicas to 3")
}
if set.Status.UpdatedReplicas != 3 {
t.Error("Failed to set updatedReplicas to 3")
}
}
func NewRevisionDeletePodFailure(t *testing.T, set *apps.StatefulSet, invariants invariantFunc) {
client := fake.NewSimpleClientset(set)
om, _, ssc := setupController(client)
if err := scaleUpStatefulSetControl(set, ssc, om, invariants); err != nil {
t.Errorf("Failed to turn up StatefulSet : %s", err)
}
var err error
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
if set.Status.Replicas != 3 {
t.Error("Failed to scale StatefulSet to 3 replicas")
}
selector, err := metav1.LabelSelectorAsSelector(set.Spec.Selector)
if err != nil {
t.Error(err)
}
pods, err := om.podsLister.Pods(set.Namespace).List(selector)
if err != nil {
t.Error(err)
}
// trigger a new revision
updateSet := set.DeepCopy()
updateSet.Spec.Template.Spec.Containers[0].Image = "nginx-new"
if err := om.setsIndexer.Update(updateSet); err != nil {
t.Error("Failed to update StatefulSet")
}
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
// delete fails
om.SetDeleteStatefulPodError(apierrors.NewInternalError(errors.New("API server failed")), 0)
_, err = ssc.UpdateStatefulSet(context.TODO(), set, pods)
if err == nil {
t.Error("Expected err in update StatefulSet when deleting a pod")
}
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
if err := invariants(set, om); err != nil {
t.Error(err)
}
if set.Status.CurrentReplicas != 3 {
t.Fatalf("Failed pod deletion should not update CurrentReplicas: want 3, got %d", set.Status.CurrentReplicas)
}
if set.Status.CurrentRevision == set.Status.UpdateRevision {
t.Error("Failed to create new revision")
}
// delete works
om.SetDeleteStatefulPodError(nil, 0)
status, err := ssc.UpdateStatefulSet(context.TODO(), set, pods)
if err != nil {
t.Fatalf("Unexpected err in update StatefulSet: %v", err)
}
if status.CurrentReplicas != 2 {
t.Fatalf("Pod deletion should update CurrentReplicas: want 2, got %d", status.CurrentReplicas)
}
if err := invariants(set, om); err != nil {
t.Error(err)
}
}
func emptyInvariants(set *apps.StatefulSet, om *fakeObjectManager) error {
return nil
}
func TestStatefulSetControlWithStartOrdinal(t *testing.T) {
featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.StatefulSetStartOrdinal, true)
simpleSetFn := func() *apps.StatefulSet {
statefulSet := newStatefulSet(3)
statefulSet.Spec.Ordinals = &apps.StatefulSetOrdinals{Start: int32(2)}
return statefulSet
}
testCases := []struct {
fn func(*testing.T, *apps.StatefulSet, invariantFunc)
obj func() *apps.StatefulSet
}{
{CreatesPodsWithStartOrdinal, simpleSetFn},
}
for _, testCase := range testCases {
testObj := testCase.obj
testFn := testCase.fn
set := testObj()
testFn(t, set, emptyInvariants)
}
}
func CreatesPodsWithStartOrdinal(t *testing.T, set *apps.StatefulSet, invariants invariantFunc) {
client := fake.NewSimpleClientset(set)
om, _, ssc := setupController(client)
if err := scaleUpStatefulSetControl(set, ssc, om, invariants); err != nil {
t.Errorf("Failed to turn up StatefulSet : %s", err)
}
var err error
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
if set.Status.Replicas != 3 {
t.Error("Failed to scale statefulset to 3 replicas")
}
if set.Status.ReadyReplicas != 3 {
t.Error("Failed to set ReadyReplicas correctly")
}
if set.Status.UpdatedReplicas != 3 {
t.Error("Failed to set UpdatedReplicas correctly")
}
selector, err := metav1.LabelSelectorAsSelector(set.Spec.Selector)
if err != nil {
t.Error(err)
}
pods, err := om.podsLister.Pods(set.Namespace).List(selector)
if err != nil {
t.Error(err)
}
sort.Sort(ascendingOrdinal(pods))
for i, pod := range pods {
expectedOrdinal := 2 + i
actualPodOrdinal := getOrdinal(pod)
if actualPodOrdinal != expectedOrdinal {
t.Errorf("Expected pod ordinal %d. Got %d", expectedOrdinal, actualPodOrdinal)
}
}
}
func RecreatesPVCForPendingPod(t *testing.T, set *apps.StatefulSet, invariants invariantFunc) {
client := fake.NewSimpleClientset()
om, _, ssc := setupController(client)
selector, err := metav1.LabelSelectorAsSelector(set.Spec.Selector)
if err != nil {
t.Error(err)
}
pods, err := om.podsLister.Pods(set.Namespace).List(selector)
if err != nil {
t.Error(err)
}
if _, err := ssc.UpdateStatefulSet(context.TODO(), set, pods); err != nil {
t.Errorf("Error updating StatefulSet %s", err)
}
if err := invariants(set, om); err != nil {
t.Error(err)
}
pods, err = om.podsLister.Pods(set.Namespace).List(selector)
if err != nil {
t.Error(err)
}
for _, claim := range getPersistentVolumeClaims(set, pods[0]) {
om.claimsIndexer.Delete(&claim)
}
pods[0].Status.Phase = v1.PodPending
om.podsIndexer.Update(pods[0])
if _, err := ssc.UpdateStatefulSet(context.TODO(), set, pods); err != nil {
t.Errorf("Error updating StatefulSet %s", err)
}
// invariants check if there any missing PVCs for the Pods
if err := invariants(set, om); err != nil {
t.Error(err)
}
_, err = om.podsLister.Pods(set.Namespace).List(selector)
if err != nil {
t.Error(err)
}
}
func TestStatefulSetControlScaleDownDeleteError(t *testing.T) {
runTestOverPVCRetentionPolicies(
t, "", func(t *testing.T, policy *apps.StatefulSetPersistentVolumeClaimRetentionPolicy) {
set := newStatefulSet(3)
set.Spec.PersistentVolumeClaimRetentionPolicy = policy
invariants := assertMonotonicInvariants
client := fake.NewSimpleClientset(set)
om, _, ssc := setupController(client)
if err := scaleUpStatefulSetControl(set, ssc, om, invariants); err != nil {
t.Errorf("Failed to turn up StatefulSet : %s", err)
}
var err error
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
*set.Spec.Replicas = 0
om.SetDeleteStatefulPodError(apierrors.NewInternalError(errors.New("API server failed")), 2)
if err := scaleDownStatefulSetControl(set, ssc, om, invariants); !isOrHasInternalError(err) {
t.Errorf("StatefulSetControl failed to throw error on delete %s", err)
}
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
if err := scaleDownStatefulSetControl(set, ssc, om, invariants); err != nil {
t.Errorf("Failed to turn down StatefulSet %s", err)
}
set, err = om.setsLister.StatefulSets(set.Namespace).Get(set.Name)
if err != nil {
t.Fatalf("Error getting updated StatefulSet: %v", err)
}
if set.Status.Replicas != 0 {
t.Error("Failed to scale statefulset to 0 replicas")
}
if set.Status.ReadyReplicas != 0 {
t.Error("Failed to set readyReplicas to 0")
}
if set.Status.UpdatedReplicas != 0 {
t.Error("Failed to set updatedReplicas to 0")
}
})
}
func TestStatefulSetControl_getSetRevisions(t *testing.T) {
type testcase struct {
name string
existing []*apps.ControllerRevision
set *apps.StatefulSet
expectedCount int
expectedCurrent *apps.ControllerRevision
expectedUpdate *apps.ControllerRevision
err bool
}
testFn := func(test *testcase, t *testing.T) {
client := fake.NewSimpleClientset()
informerFactory := informers.NewSharedInformerFactory(client, controller.NoResyncPeriodFunc())
spc := NewStatefulPodControlFromManager(newFakeObjectManager(informerFactory), &noopRecorder{})
ssu := newFakeStatefulSetStatusUpdater(informerFactory.Apps().V1().StatefulSets())
ssc := defaultStatefulSetControl{spc, ssu, history.NewFakeHistory(informerFactory.Apps().V1().ControllerRevisions())}
stop := make(chan struct{})
defer close(stop)
informerFactory.Start(stop)
cache.WaitForCacheSync(
stop,
informerFactory.Apps().V1().StatefulSets().Informer().HasSynced,
informerFactory.Core().V1().Pods().Informer().HasSynced,
informerFactory.Apps().V1().ControllerRevisions().Informer().HasSynced,
)
test.set.Status.CollisionCount = new(int32)
for i := range test.existing {
ssc.controllerHistory.CreateControllerRevision(test.set, test.existing[i], test.set.Status.CollisionCount)
}
revisions, err := ssc.ListRevisions(test.set)
if err != nil {
t.Fatal(err)
}
current, update, _, err := ssc.getStatefulSetRevisions(test.set, revisions)
if err != nil {
t.Fatalf("error getting statefulset revisions:%v", err)
}
revisions, err = ssc.ListRevisions(test.set)
if err != nil {
t.Fatal(err)
}
if len(revisions) != test.expectedCount {
t.Errorf("%s: want %d revisions got %d", test.name, test.expectedCount, len(revisions))
}
if test.err && err == nil {
t.Errorf("%s: expected error", test.name)
}
if !test.err && !history.EqualRevision(current, test.expectedCurrent) {
t.Errorf("%s: for current want %v got %v", test.name, test.expectedCurrent, current)
}
if !test.err && !history.EqualRevision(update, test.expectedUpdate) {
t.Errorf("%s: for update want %v got %v", test.name, test.expectedUpdate, update)
}
if !test.err && test.expectedCurrent != nil && current != nil && test.expectedCurrent.Revision != current.Revision {
t.Errorf("%s: for current revision want %d got %d", test.name, test.expectedCurrent.Revision, current.Revision)
}
if !test.err && test.expectedUpdate != nil && update != nil && test.expectedUpdate.Revision != update.Revision {
t.Errorf("%s: for update revision want %d got %d", test.name, test.expectedUpdate.Revision, update.Revision)
}
}
updateRevision := func(cr *apps.ControllerRevision, revision int64) *apps.ControllerRevision {
clone := cr.DeepCopy()
clone.Revision = revision
return clone
}
runTestOverPVCRetentionPolicies(
t, "", func(t *testing.T, policy *apps.StatefulSetPersistentVolumeClaimRetentionPolicy) {
set := newStatefulSet(3)
set.Spec.PersistentVolumeClaimRetentionPolicy = policy
set.Status.CollisionCount = new(int32)
rev0 := newRevisionOrDie(set, 1)
set1 := set.DeepCopy()
set1.Spec.Template.Spec.Containers[0].Image = "foo"
set1.Status.CurrentRevision = rev0.Name
set1.Status.CollisionCount = new(int32)
rev1 := newRevisionOrDie(set1, 2)
set2 := set1.DeepCopy()
set2.Spec.Template.Labels["new"] = "label"
set2.Status.CurrentRevision = rev0.Name
set2.Status.CollisionCount = new(int32)
rev2 := newRevisionOrDie(set2, 3)
tests := []testcase{
{
name: "creates initial revision",
existing: nil,
set: set,
expectedCount: 1,
expectedCurrent: rev0,
expectedUpdate: rev0,
err: false,
},
{
name: "creates revision on update",
existing: []*apps.ControllerRevision{rev0},
set: set1,
expectedCount: 2,
expectedCurrent: rev0,
expectedUpdate: rev1,
err: false,
},
{
name: "must not recreate a new revision of same set",
existing: []*apps.ControllerRevision{rev0, rev1},
set: set1,
expectedCount: 2,
expectedCurrent: rev0,
expectedUpdate: rev1,
err: false,
},
{
name: "must rollback to a previous revision",
existing: []*apps.ControllerRevision{rev0, rev1, rev2},
set: set1,
expectedCount: 3,
expectedCurrent: rev0,
expectedUpdate: updateRevision(rev1, 4),
err: false,
},
}
for i := range tests {
testFn(&tests[i], t)
}
})
}
func setupPodManagementPolicy(podManagementPolicy apps.PodManagementPolicyType, set *apps.StatefulSet) *apps.StatefulSet {
set.Spec.PodManagementPolicy = podManagementPolicy
return set
}
func TestStatefulSetControlRollingUpdateWithMaxUnavailable(t *testing.T) {
featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.MaxUnavailableStatefulSet, true)
simpleParallelVerificationFn := func(
set *apps.StatefulSet,
spc *fakeObjectManager,
ssc StatefulSetControlInterface,
pods []*v1.Pod,
totalPods int,
selector labels.Selector,
) []*v1.Pod {
// in burst mode, 2 pods got deleted, so 2 new pods will be created at the same time
if len(pods) != totalPods {
t.Fatalf("Expected create pods 4/5, got pods %v", len(pods))
}
// if pod 4 ready, start to update pod 3, even though 5 is not ready
spc.setPodRunning(set, 4)
spc.setPodRunning(set, 5)
originalPods, _ := spc.setPodReady(set, 4)