Bug 2094012: UPSTREAM: 110652: fix: --chunk-size with selector returns missing result

staging/src/k8s.io/apiserver/pkg/storage/etcd3/store.go

@@ -819,7 +819,7 @@ func growSlice(v reflect.Value, maxCapacity int, sizes ...int) {
 		return
 	}
 	if v.Len() > 0 {
-		extra := reflect.MakeSlice(v.Type(), 0, max)
+		extra := reflect.MakeSlice(v.Type(), v.Len(), max)
 		reflect.Copy(extra, v)
 		v.Set(extra)
 	} else {

staging/src/k8s.io/apiserver/pkg/storage/etcd3/store_test.go

@@ -2240,6 +2240,7 @@ func Test_decodeContinue(t *testing.T) {
 func Test_growSlice(t *testing.T) {
 	type args struct {
 		initialCapacity int
+		initialLen      int
 		v               reflect.Value
 		maxCapacity     int
 		sizes           []int
@@ -2248,6 +2249,7 @@ func Test_growSlice(t *testing.T) {
 		name string
 		args args
 		cap  int
+		len  int
 	}{
 		{
 			name: "empty",
@@ -2279,13 +2281,29 @@ func Test_growSlice(t *testing.T) {
 			args: args{initialCapacity: 5, maxCapacity: 10, sizes: []int{8, 4}},
 			cap:  8,
 		},
+		{
+			name: "with existing capacity and length above max",
+			args: args{initialCapacity: 12, initialLen: 5, maxCapacity: 10, sizes: []int{8, 4}},
+			cap:  12,
+			len:  5,
+		},
+		{
+			name: "with existing capacity and length below max",
+			args: args{initialCapacity: 5, initialLen: 3, maxCapacity: 10, sizes: []int{8, 4}},
+			cap:  8,
+			len:  3,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			if tt.args.initialCapacity > 0 {
-				tt.args.v = reflect.ValueOf(make([]example.Pod, 0, tt.args.initialCapacity))
+				val := make([]example.Pod, tt.args.initialLen, tt.args.initialCapacity)
+				for i := 0; i < tt.args.initialLen; i++ {
+					val[i].Name = fmt.Sprintf("test-%d", i)
+				}
+				tt.args.v = reflect.ValueOf(val)
 			}
-			// reflection requires that the value be addressible in order to call set,
+			// reflection requires that the value be addressable in order to call set,
 			// so we must ensure the value we created is available on the heap (not a problem
 			// for normal usage)
 			if !tt.args.v.CanAddr() {
@@ -2297,6 +2315,17 @@ func Test_growSlice(t *testing.T) {
 			if tt.cap != tt.args.v.Cap() {
 				t.Errorf("Unexpected capacity: got=%d want=%d", tt.args.v.Cap(), tt.cap)
 			}
+			if tt.len != tt.args.v.Len() {
+				t.Errorf("Unexpected length: got=%d want=%d", tt.args.v.Len(), tt.len)
+			}
+			for i := 0; i < tt.args.v.Len(); i++ {
+				nameWanted := fmt.Sprintf("test-%d", i)
+				val := tt.args.v.Index(i).Interface()
+				pod, ok := val.(example.Pod)
+				if !ok || pod.Name != nameWanted {
+					t.Errorf("Unexpected element value: got=%s, want=%s", pod.Name, nameWanted)
+				}
+			}
 		})
 	}
 }

test/integration/apiserver/apiserver_test.go

@@ -731,6 +731,69 @@ func TestAPIListChunking(t *testing.T) {
 	}
 }
 
+func TestAPIListChunkingWithLabelSelector(t *testing.T) {
+	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.APIListChunking, true)()
+	s, clientSet, closeFn := setup(t)
+	defer closeFn()
+
+	ns := framework.CreateTestingNamespace("list-paging-with-label-selector", s, t)
+	defer framework.DeleteTestingNamespace(ns, s, t)
+
+	rsClient := clientSet.AppsV1().ReplicaSets(ns.Name)
+
+	for i := 0; i < 10; i++ {
+		rs := newRS(ns.Name)
+		rs.Name = fmt.Sprintf("test-%d", i)
+		odd := i%2 != 0
+		rs.Labels = map[string]string{"odd-index": strconv.FormatBool(odd)}
+		if _, err := rsClient.Create(context.TODO(), rs, metav1.CreateOptions{}); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	calls := 0
+	firstRV := ""
+	p := &pager.ListPager{
+		PageSize: 1,
+		PageFn: pager.SimplePageFunc(func(opts metav1.ListOptions) (runtime.Object, error) {
+			calls++
+			list, err := rsClient.List(context.TODO(), opts)
+			if err != nil {
+				return nil, err
+			}
+			if calls == 1 {
+				firstRV = list.ResourceVersion
+			}
+			return list, err
+		}),
+	}
+	listObj, _, err := p.List(context.Background(), metav1.ListOptions{LabelSelector: "odd-index=true", Limit: 3})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if calls != 2 {
+		t.Errorf("unexpected list invocations: %d", calls)
+	}
+	list := listObj.(metav1.ListInterface)
+	if len(list.GetContinue()) != 0 {
+		t.Errorf("unexpected continue: %s", list.GetContinue())
+	}
+	if list.GetResourceVersion() != firstRV {
+		t.Errorf("unexpected resource version: %s instead of %s", list.GetResourceVersion(), firstRV)
+	}
+	var names []string
+	if err := meta.EachListItem(listObj, func(obj runtime.Object) error {
+		rs := obj.(*apps.ReplicaSet)
+		names = append(names, rs.Name)
+		return nil
+	}); err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(names, []string{"test-1", "test-3", "test-5", "test-7", "test-9"}) {
+		t.Errorf("unexpected items: %#v", list)
+	}
+}
+
 func makeSecret(name string) *v1.Secret {
 	return &v1.Secret{
 		ObjectMeta: metav1.ObjectMeta{