dynamicClient, err := dynamic.NewForConfig(config)
	if err != nil {
		return nil, false, err
	}

	discoveryClient, err := discovery.NewDiscoveryClientForConfig(config)
	if err != nil {
		return nil, false, err
	}

	go svm.NewResourceVersionController(
		ctx,
		client,
		discoveryClient,
		metadata.NewForConfigOrDie(config),
		informer,

			return diskcached.NewCachedDiscoveryClientForConfig(restConfig, discoveryCacheDir, httpCacheDir, 6*time.Hour)
		}
		d, err := discovery.NewDiscoveryClientForConfig(restConfig)
		if err != nil {
			return nil, err
		}
		return memory.NewMemCacheClient(d), nil
	})
	out.mapper = lazy.NewWithRetry(func() (meta.ResettableRESTMapper, error) {

	if err != nil {
		t.Fatal(err)
	}
	defer tearDown()

	apiExtensionsClient, err := clientset.NewForConfig(config)
	if err != nil {
		t.Fatal(err)
	}

	discoveryClient, err := discovery.NewDiscoveryClientForConfig(config)
	if err != nil {
		t.Fatal(err)
	}

	crd := selectableFieldFixture.DeepCopy()
	crd, err = fixtures.CreateNewV1CustomResourceDefinitionWatchUnsafe(crd, apiExtensionsClient)
	if err != nil {

				host = test.LoopbackClientBindAddressOverride
			}
			s.LoopbackClientConfig.Host = net.JoinHostPort(host, strconv.Itoa(secureOptions.BindPort))

			client, err := discovery.NewDiscoveryClientForConfig(s.LoopbackClientConfig)
			if err != nil {
				t.Fatalf("failed to create loopback client: %v", err)
			}
			got, err := client.ServerVersion()
			if err != nil {

func CreateNewVersionedScaleClient(crd *apiextensionsv1.CustomResourceDefinition, config *rest.Config, version string) (scale.ScalesGetter, error) {
	discoveryClient, err := discovery.NewDiscoveryClientForConfig(config)
	if err != nil {
		return nil, err
	}
	groupResource, err := discoveryClient.ServerResourcesForGroupVersion(crd.Spec.Group + "/" + version)
	if err != nil {
		return nil, err
	}

- client-go discovery clients constructed using `NewDiscoveryClientForConfig` or `NewDiscoveryClientForConfigOrDie` default to rate limits that cause normal discovery request patterns to take several seconds. This is fixed in https://issue.k8s.io/86168 and will be resolved in v1.17.1. As a workaround, the `Burst` value can be adjusted higher in the rest.Config passed into `NewDiscoveryClientForConfig` or `NewDiscoveryClientForConfigOrDie`.

- Resolves performance regression in `kubectl get all` and in client-go discovery clients constructed using `NewDiscoveryClientForConfig` or `NewDiscoveryClientForConfigOrDie`. ([#86168](https://github.com/kubernetes/kubernetes/pull/86168), [@liggitt](https://github.com/liggitt)) [SIG API Machinery]