If no system or power failure occurred, the behavior for PUT/DELETE WRITETHROUGH mode and PUT/DELETE WRITEBACK mode are functionally equivalent except for the response time differences. That is, the database integrity is maintained for both WRITETHROUGH and WRITEBACK modes.
Read and modify K/V operations (such as PUT/GET/DELETE) sent from a client within a single threaded context on the same TCP/SSL connection SHOULD BE processed and responded with the received order.