The description of preconditions seems a bit incomplete.
To me it seems you need to avoid certain constructs, like UNIQUE constraints. Otherwise you might have a local insert plus a replicated one, both the same value in the unique column, and different nodes reject different inserts.
To me it seems you need to avoid certain constructs, like UNIQUE constraints. Otherwise you might have a local insert plus a replicated one, both the same value in the unique column, and different nodes reject different inserts.