@memoized.memoized_method
def datastore_versions(self, request, datastore):
    try:
        return api.trove.datastore_version_list(request, datastore)
    except Exception:
        LOG.exception('Exception while obtaining datastore version list')
        self._datastore_versions = []
@memoized.memoized_method
def datastore_versions(self, request, datastore):
    try:
        return api.trove.datastore_version_list(request, datastore)
    except Exception:
        LOG.exception('Exception while obtaining datastore version list')
        self._datastore_versions = []