强制切leader的，可以加快很多。不用等都迁移完。有说明的，默认比较长
tiup cluster upgrade --help
–transfer-timeout uint Timeout in seconds when transferring PD and TiKV store leaders, also for TiCDC drain one capture (default 600)
强制切leader的，可以加快很多。不用等都迁移完。有说明的，默认比较长
tiup cluster upgrade --help
–transfer-timeout uint Timeout in seconds when transferring PD and TiKV store leaders, also for TiCDC drain one capture (default 600)