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Fix potential panic in namespace controller when rapidly create/delete namespace of same name

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This commit is contained in:
derekwaynecarr 2016-10-06 23:28:56 -04:00 committed by Derek Carr
parent e3067f326f
commit e634312de4
1 changed files with 16 additions and 1 deletions
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17
pkg/controller/namespace/namespace_controller_utils.go
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@ -71,6 +71,7 @@ func (o operationNotSupportedCache) isSupported(key operationKey) bool {
type updateNamespaceFunc func(kubeClient clientset.Interface, namespace *api.Namespace) (*api.Namespace, error)
// retryOnConflictError retries the specified fn if there was a conflict error
// it will return an error if the UID for an object changes across retry operations.
// TODO RetryOnConflict should be a generic concept in client code
func retryOnConflictError(kubeClient clientset.Interface, namespace *api.Namespace, fn updateNamespaceFunc) (result *api.Namespace, err error) {
latestNamespace := namespace
@ -82,10 +83,14 @@ func retryOnConflictError(kubeClient clientset.Interface, namespace *api.Namespa
if !errors.IsConflict(err) {
return nil, err
}
prevNamespace := latestNamespace
latestNamespace, err = kubeClient.Core().Namespaces().Get(latestNamespace.Name)
if err != nil {
return nil, err
}
if prevNamespace.UID != latestNamespace.UID {
return nil, fmt.Errorf("namespace uid has changed across retries")
}
}
}
@ -385,9 +390,19 @@ func syncNamespace(
return err
}
// the latest view of the namespace asserts that namespace is no longer deleting..
if namespace.DeletionTimestamp.IsZero() {
return nil
}
// if the namespace is already finalized, delete it
if finalized(namespace) {
err = kubeClient.Core().Namespaces().Delete(namespace.Name, nil)
var opts *api.DeleteOptions
uid := namespace.UID
if len(uid) > 0 {
opts = &api.DeleteOptions{Preconditions: &api.Preconditions{UID: &uid}}
}
err = kubeClient.Core().Namespaces().Delete(namespace.Name, opts)
if err != nil && !errors.IsNotFound(err) {
return err
}