As soon as one node begins to load a Space, it should immediately "own" that Space

(Missing Feature, Closed -> Not a Bug, Priority: High, Test Status: No automated tests yet , Reported By Justin du Coeur, )
Scalability
Summary: That is, if we're going to avoid evil race conditions, there probably needs to be a reliable concept of which node a shard lives on.
This may be a non-issue -- it wouldn't surprise me if Cluster Sharding deals with this directly. But make sure that is true.