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List nodes through informer in every iteration

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Also, refactor the code a bit so it can be tested without checking for eviction support.
This commit is contained in:
Jan Chaloupka
2020-03-03 16:31:46 +01:00
parent df510187d6
commit 9593ce16d9
5 changed files with 155 additions and 50 deletions
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31
test/e2e/e2e_test.go
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@@ -24,6 +24,8 @@ import (
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/informers"
coreinformers "k8s.io/client-go/informers/core/v1"
clientset "k8s.io/client-go/kubernetes"
"k8s.io/klog"
"sigs.k8s.io/descheduler/cmd/descheduler/app/options"
@@ -93,7 +95,7 @@ func RcByNameContainer(name string, replicas int32, labels map[string]string, gr
}
// startEndToEndForLowNodeUtilization tests the lownode utilization strategy.
func startEndToEndForLowNodeUtilization(clientset clientset.Interface) {
func startEndToEndForLowNodeUtilization(clientset clientset.Interface, nodeInformer coreinformers.NodeInformer) {
var thresholds = make(deschedulerapi.ResourceThresholds)
var targetThresholds = make(deschedulerapi.ResourceThresholds)
thresholds[v1.ResourceMemory] = 20
@@ -108,7 +110,7 @@ func startEndToEndForLowNodeUtilization(clientset clientset.Interface) {
klog.Fatalf("%v", err)
}
stopChannel := make(chan struct{})
nodes, err := nodeutil.ReadyNodes(clientset, "", stopChannel)
nodes, err := nodeutil.ReadyNodes(clientset, nodeInformer, "", stopChannel)
if err != nil {
klog.Fatalf("%v", err)
}
@@ -132,6 +134,14 @@ func TestE2E(t *testing.T) {
if err != nil {
t.Errorf("Error listing node with %v", err)
}
sharedInformerFactory := informers.NewSharedInformerFactory(clientSet, 0)
nodeInformer := sharedInformerFactory.Core().V1().Nodes()
stopChannel := make(chan struct{}, 0)
sharedInformerFactory.Start(stopChannel)
sharedInformerFactory.WaitForCacheSync(stopChannel)
defer close(stopChannel)
// Assumption: We would have 3 node cluster by now. Kubeadm brings all the master components onto master node.
// So, the last node would have least utilization.
rc := RcByNameContainer("test-rc", int32(15), map[string]string{"test": "app"}, nil)
@@ -139,7 +149,7 @@ func TestE2E(t *testing.T) {
if err != nil {
t.Errorf("Error creating deployment %v", err)
}
evictPods(t, clientSet, nodeList, rc)
evictPods(t, clientSet, nodeInformer, nodeList, rc)
rc.Spec.Template.Annotations = map[string]string{"descheduler.alpha.kubernetes.io/evict": "true"}
rc.Spec.Replicas = func(i int32) *int32 { return &i }(15)
@@ -156,7 +166,7 @@ func TestE2E(t *testing.T) {
if err != nil {
t.Errorf("Error creating deployment %v", err)
}
evictPods(t, clientSet, nodeList, rc)
evictPods(t, clientSet, nodeInformer, nodeList, rc)
}
func TestDeschedulingInterval(t *testing.T) {
@@ -173,8 +183,13 @@ func TestDeschedulingInterval(t *testing.T) {
c := make(chan bool)
go func() {
err := descheduler.RunDeschedulerStrategies(s, deschedulerPolicy)
if err != nil {
evictionPolicyGroupVersion, err := eutils.SupportEviction(s.Client)
if err != nil || len(evictionPolicyGroupVersion) == 0 {
t.Errorf("Error when checking support for eviction: %v", err)
}
stopChannel := make(chan struct{})
if err := descheduler.RunDeschedulerStrategies(s, deschedulerPolicy, evictionPolicyGroupVersion, stopChannel); err != nil {
t.Errorf("Error running descheduler strategies: %+v", err)
}
c <- true
@@ -188,7 +203,7 @@ func TestDeschedulingInterval(t *testing.T) {
}
}
func evictPods(t *testing.T, clientSet clientset.Interface, nodeList *v1.NodeList, rc *v1.ReplicationController) {
func evictPods(t *testing.T, clientSet clientset.Interface, nodeInformer coreinformers.NodeInformer, nodeList *v1.NodeList, rc *v1.ReplicationController) {
var leastLoadedNode v1.Node
podsBefore := math.MaxInt16
for i := range nodeList.Items {
@@ -208,7 +223,7 @@ func evictPods(t *testing.T, clientSet clientset.Interface, nodeList *v1.NodeLis
}
}
t.Log("Eviction of pods starting")
startEndToEndForLowNodeUtilization(clientSet)
startEndToEndForLowNodeUtilization(clientSet, nodeInformer)
podsOnleastUtilizedNode, err := podutil.ListEvictablePodsOnNode(clientSet, &leastLoadedNode, true)
if err != nil {
t.Errorf("Error listing pods on a node %v", err)