Give each write a unique ID (e.g., a timestamp, a long random number, a UUID, or a hash of the key and value), pick the write with the highest ID as the winner, and throw away the other writes. If a timestamp is used, this technique is known as last write wins (LWW). Although this approach is popular, it is dangerously prone to data loss [35]. We will discuss LWW in more detail at the end of this chapter (“Detecting Concurrent Writes”).
