pub(crate) async fn fetch_serving_infos(
metadata_manager: &MetadataManager,
) -> MetaResult<(Vec<WorkerNode>, HashMap<FragmentId, FragmentServingInfo>)>pub(crate) async fn fetch_serving_infos(
metadata_manager: &MetadataManager,
) -> MetaResult<(Vec<WorkerNode>, HashMap<FragmentId, FragmentServingInfo>)>