pub async fn start_serving_vnode_mapping_worker(
notification_manager: NotificationManagerRef,
metadata_manager: MetadataManager,
serving_vnode_mapping: ServingVnodeMappingRef,
) -> (JoinHandle<()>, Sender<()>)
pub async fn start_serving_vnode_mapping_worker(
notification_manager: NotificationManagerRef,
metadata_manager: MetadataManager,
serving_vnode_mapping: ServingVnodeMappingRef,
) -> (JoinHandle<()>, Sender<()>)