TiKV内存占用参数修改问题,在线修改配置文件失败

tiup版本
v1.2.0 tiup
Go Version: go1.13
Git Branch: release-1.2
GitHash: 1a4fbe7

tiup cluster版本
Found cluster newer version:

The latest version:         v1.2.3
Local installed version:    v1.2.0
Update current component:   tiup update cluster
Update all components:      tiup update --all

Starting component cluster: /root/.tiup/components/cluster/v1.2.0/tiup-cluster -v
tiup version v1.2.0 tiup
Go Version: go1.13
Git Branch: release-1.2
GitHash: 1a4fbe7