}
		watchCacheSizes[schema.ParseGroupResource(tokens[0])] = size
	}
	return watchCacheSizes, nil
}

// WriteWatchCacheSizes turns a map of cache size values into a list of string specifications.
func WriteWatchCacheSizes(watchCacheSizes map[schema.GroupResource]int) ([]string, error) {
	var cacheSizes []string

	for resource, size := range watchCacheSizes {
		if size < 0 {

		// Ensure that overrides parse correctly.
		userSpecified, err := apiserveroptions.ParseWatchCacheSizes(completed.Etcd.WatchCacheSizes)
		if err != nil {
			return CompletedOptions{}, err
		}
		for resource, size := range userSpecified {
			sizes[resource] = size
		}
		completed.Etcd.WatchCacheSizes, err = apiserveroptions.WriteWatchCacheSizes(sizes)
		if err != nil {
			return CompletedOptions{}, err
		}
	}

	etcdOptionsCopy := etcdOptions
	etcdOptionsCopy.StorageConfig.Codec = unstructured.UnstructuredJSONScheme
	etcdOptionsCopy.StorageConfig.StorageObjectCountTracker = tracker
	etcdOptionsCopy.WatchCacheSizes = nil // this control is not provided for custom resources

	return etcdOptions.CreateRESTOptionsGetter(&genericoptions.SimpleStorageFactory{StorageConfig: etcdOptionsCopy.StorageConfig}, resourceTransformers)
}