Can I add daemons dynamic to a cluster ？

[Jun Guo]

hi 

1. I started a cluster with 1 coordinator and 2 daemons 
   
2. Add 1 space “test_space” and put some data in the space
   
3. Start 1 more daemon of this cluster

       I suppose that daemon 3 will replicate data from the early 2 daemons， but it doesn't~