@Override
        public Optional<byte[]> getData(Path path) {
            return get(data, path, () -> curator.getData(path)).map(data -> Arrays.copyOf(data, data.length));
        }
Create an empty snapshot at a given generation (as an empty snapshot is a valid partial snapshot)
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/persistence/CachingCurator.java