Logs [pod,node] pairs for sessionAffinity test

Logs information for fixing flakiness for #71423

test/e2e/framework/service_util.go

@@ -25,7 +25,7 @@ import (
 	"strings"
 	"time"
 
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	policyv1beta1 "k8s.io/api/policy/v1beta1"
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -109,6 +109,14 @@ type ServiceTestJig struct {
 	Labels map[string]string
 }
 
+// PodNode is a pod-node pair indicating which node a given pod is running on
+type PodNode struct {
+	// Pod represents pod name
+	Pod string
+	// Node represents node name
+	Node string
+}
+
 // NewServiceTestJig allocates and inits a new ServiceTestJig.
 func NewServiceTestJig(client clientset.Interface, name string) *ServiceTestJig {
 	j := &ServiceTestJig{}
@@ -348,6 +356,25 @@ func PickNodeIP(c clientset.Interface) string {
 	return ip
 }
 
+// PodNodePairs return PodNode pairs for all pods in a namespace
+func PodNodePairs(c clientset.Interface, ns string) ([]PodNode, error) {
+	var result []PodNode
+
+	podList, err := c.CoreV1().Pods(ns).List(metav1.ListOptions{})
+	if err != nil {
+		return result, err
+	}
+
+	for _, pod := range podList.Items {
+		result = append(result, PodNode{
+			Pod:  pod.Name,
+			Node: pod.Spec.NodeName,
+		})
+	}
+
+	return result, nil
+}
+
 // GetEndpointNodes returns a map of nodenames:external-ip on which the
 // endpoints of the given Service are running.
 func (j *ServiceTestJig) GetEndpointNodes(svc *v1.Service) map[string][]string {

test/e2e/network/service.go

@@ -27,7 +27,7 @@ import (
 
 	compute "google.golang.org/api/compute/v1"
 
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/apimachinery/pkg/util/intstr"
@@ -2111,6 +2111,8 @@ func execAffinityTestForLBService(f *framework.Framework, cs clientset.Interface
 	svc = jig.WaitForLoadBalancerOrFail(ns, serviceName, framework.LoadBalancerCreateTimeoutDefault)
 	jig.SanityCheckService(svc, v1.ServiceTypeLoadBalancer)
 	defer func() {
+		podNodePairs, err := framework.PodNodePairs(cs, ns)
+		framework.Logf("[pod,node] pairs: %+v; err: %v", podNodePairs, err)
 		framework.StopServeHostnameService(cs, ns, serviceName)
 		lb := cloudprovider.DefaultLoadBalancerName(svc)
 		framework.Logf("cleaning load balancer resource for %s", lb)