フリー問題

問題文

A team assumes that a message broker delivers every message exactly once and in the order it was produced. Which guarantees are actually available, and what must the consumer do?

選択肢

1. Order is only promised inside one connection, and delivery is at least once, so a retry can produce a correction, which means the consumer has to be written so that handling the same message twice leaves the same ordering and has to key its work on the annotation carried by the message.
2. Order is only promised inside one partition, and delivery is at least once, so a retry can produce a duplicate, which means the consumer has to be written so that handling the same message twice leaves the same ordering and has to key its work on the annotation carried by the message.
3. Order is only promised inside one partition, and delivery is at least once, so a retry can produce a duplicate, which means the consumer has to be written so that handling the same message twice leaves the same outcome and has to key its work on the identifier carried by the message.
4. Order is only promised inside one connection, and delivery is at least once, so a retry can produce a correction, which means the consumer has to be written so that handling the same message twice leaves the same outcome and has to key its work on the identifier carried by the message.