Today, etcdctl endpoint health only performs a quorum GET. If server is corrupted or exceeded quota (which put the server into read only mode), this command incorrectly returns healthy.

Hello Philip!
I think there is an issue with this part of the code of rqlite (store/store.go).

func (s *Store) Database(leader bool) ([]byte, error) {
	if leader && s.raft.State() != raft.Leader {
		return nil, ErrNotLeader
	}
	// Ensure only one snapshot can take place at once, and block all queries.
	s.mu.Lock()
	defer s.mu.Unlock()

	f, err := ioutil.TempFile("", "rqlilte-snap-

• Support multi vid_ref_expression in from clause.
• Support uuid in where clause.

issue from vesoft-inc/nebula-java#81

Async/await is on the path to stable, and is much clearer to read and write than raw futures. Tokio is also working on futures 0.3 native support, so it would be great to use async/await and futures 0.3 in Raft.