ovn-sbctl would stuck when leader of raft changes

[linup2011]

when I run scale test, the ovn-sbctl stuck. and found that the ovnsb leader of raft has changed from central-1 to central-2. then the command "ovn-sbctl --no-leader-only --bare --columns _uuid find chassis name=ovn-scale-4-55" on central-1 would stuck.

rally log: END: Error SSHTimeout: Timeout executing command 'sudo docker exec ovn-central-1 ovn-sbctl --no-leader-only --bare --columns _uuid find chassis name=ovn-scale-4-55' on host...
process on central-1:
[root@ovn-central-1 ovn]# ps aux | grep ovn-sbctl
root 16818 0.0 0.0 41800 6268 ? Ss 10:14 0:01 ovn-sbctl --no-leader-only --bare --columns _uuid find chassis name=ovn-scale-4-55
root 16946 0.0 0.0 41800 6128 ? Ss 11:14 0:01 ovn-sbctl --no-leader-only --bare --columns _uuid find chassis name=ovn-scale-1-56
root 17072 0.0 0.0 41800 6256 ? Ss 12:14 0:00 ovn-sbctl --no-leader-only --bare --columns _uuid find chassis name=ovn-scale-4-56
root 17198 0.0 0.0 41708 5876 ? Ss 13:14 0:00 ovn-sbctl --no-leader-only --bare --columns _uuid find chassis name=ovn-scale-1-57