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kubeadm: keep a function with short timeout in idempotency.go

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- Name the function GetConfigMapWithShortRetry to be
easier to understand that the function is with a very short timeout.
Add note that this function should be used in cases there is a
fallback to local config.
- Apply custom hardcoded interval of 50ms and timeout of 350ms to it.
Previously the fucntion used exp backoff with 5 steps up to ~340ms.
This commit is contained in:
Lubomir I. Ivanov 2024-01-16 17:53:21 +02:00
parent 5f876b9d0a
commit 54a6e6a772
3 changed files with 8 additions and 6 deletions
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2
cmd/kubeadm/app/componentconfigs/configset.go
View File

@ -72,7 +72,7 @@ func (h *handler) FromDocumentMap(docmap kubeadmapi.DocumentMap) (kubeadmapi.Com
// fromConfigMap is an utility function, which will load the value of a key of a config map and use h.FromDocumentMap() to perform the parsing
// This is an utility func. Used by the component config support implementations. Don't use it outside of that context.
func (h *handler) fromConfigMap(client clientset.Interface, cmName, cmKey string, mustExist bool) (kubeadmapi.ComponentConfig, error) {
configMap, err := apiclient.GetConfigMapWithRetry(client, metav1.NamespaceSystem, cmName)
configMap, err := apiclient.GetConfigMapWithShortRetry(client, metav1.NamespaceSystem, cmName)
if err != nil {
if !mustExist && (apierrors.IsNotFound(err) || apierrors.IsForbidden(err)) {
klog.Warningf("Warning: No %s config is loaded. Continuing without it: %v", h.GroupVersion, err)

10
cmd/kubeadm/app/util/apiclient/idempotency.go
View File

@ -19,6 +19,7 @@ package apiclient
import (
"context"
"encoding/json"
"time"
"github.com/pkg/errors"
@ -331,13 +332,14 @@ func PatchNode(client clientset.Interface, nodeName string, patchFn func(*v1.Nod
return lastError
}
// GetConfigMapWithRetry tries to retrieve a ConfigMap using the given client,
// retrying if we get an unexpected error.
func GetConfigMapWithRetry(client clientset.Interface, namespace, name string) (*v1.ConfigMap, error) {
// GetConfigMapWithShortRetry tries to retrieve a ConfigMap using the given client, retrying for a short
// time if it gets an unexpected error. The main usage of this function is in areas of the code that
// fallback to a default ConfigMap value in case the one from the API cannot be quickly obtained.
func GetConfigMapWithShortRetry(client clientset.Interface, namespace, name string) (*v1.ConfigMap, error) {
var cm *v1.ConfigMap
var lastError error
err := wait.PollUntilContextTimeout(context.Background(),
constants.KubernetesAPICallRetryInterval, kubeadmapi.GetActiveTimeouts().KubernetesAPICall.Duration,
time.Millisecond*50, time.Millisecond*350,
true, func(ctx context.Context) (bool, error) {
var err error
cm, err = client.CoreV1().ConfigMaps(namespace).Get(ctx, name, metav1.GetOptions{})

2
cmd/kubeadm/app/util/config/cluster.go
View File

@ -71,7 +71,7 @@ func FetchInitConfigurationFromCluster(client clientset.Interface, printer outpu
// getInitConfigurationFromCluster is separate only for testing purposes, don't call it directly, use FetchInitConfigurationFromCluster instead
func getInitConfigurationFromCluster(kubeconfigDir string, client clientset.Interface, newControlPlane, skipComponentConfigs bool) (*kubeadmapi.InitConfiguration, error) {
// Also, the config map really should be KubeadmConfigConfigMap...
configMap, err := apiclient.GetConfigMapWithRetry(client, metav1.NamespaceSystem, constants.KubeadmConfigConfigMap)
configMap, err := apiclient.GetConfigMapWithShortRetry(client, metav1.NamespaceSystem, constants.KubeadmConfigConfigMap)
if err != nil {
return nil, errors.Wrap(err, "failed to get config map")
}