Spec Lite: Add periodic job to prefetch images into cache¶
During Queens release glance registry is marked as deprecated and will be removed during Train cycle. Glance cache-prefetcher utility uses glance registry to cache the images.
In Train, as per Edge computing architecture, glance cache will be enabled on far-edge nodes. As of now glance-cache-prefetcher is dependent on registry which is deprecated and due for removal. In order to remove the dependency on registry, we are proposing to add a new periodic job to glance-api service which will run as per interval set using ‘cache_prefetcher_interval’ configuration option and fetch images which are queued for caching in cache directory. This new periodic job will only run if cache is enabled by the operator.
Include in Train release.