TODO: pick up new rev of Cluster once it's ready Soon enough the Cluster will be defined in a way that we can directly managing the managers in a more flexible way, by then we should be able to do batch update we want here.
TODO: pick up new rev of Cluster once it's ready Soon enough the Cluster will be defined in a way that we can directly managing the managers in a more flexible way, by then we should be able to do batch update we want here. For now, the updating pool is still done one by one.