The command 'node ls' sometimes output some incorrect information about mds.
Env: my ceph cluster has tree nodes.Each node has one monitor and one mds and some osds.
test command: ceph node ls
1.test the command 'ceph node ls'. The output has information about the three MDSs.
2.Restart one mds.
3.stop the monitor which named mon.0.
4.So,the monitor which named mon.1 will be leader. Then, test the command 'ceph node ls'. The output just has information about two MDSs,without the mds who just restarted.