func applyCompaction(kv dstorage.KV, compaction *pb.CompactionRequest) (*pb.CompactionResponse, error) { resp := &pb.CompactionResponse{} resp.Header = &pb.ResponseHeader{} err := kv.Compact(compaction.Revision) if err != nil { return nil, err } // get the current revision. which key to get is not important. _, resp.Header.Revision, _ = kv.Range([]byte("compaction"), nil, 1, 0) return resp, err }