[ceph-users] Ceph osd df tree takes a long time to respond

Ceph version 14.2.7 Ceph osd df tree command take long time than usual but I can't find out what is the reason? The monitor node still has plenty of available RAM and CPU resources. I checked the monitor and mgr log but nothing seems useful. I checked an older cluster in version 13.2.10 but Ceph osd df tree still responded normally, so that was not version related. Anyone have any idea? Thanks