In many talks and presentations, I have heard that only eventual consistency was possible in a distributed system. since, A and P are already needed, you can on

In many talks and presentations, I have heard that only eventual consistency was possible in a distributed system. since, A and P are already needed, you can only compromise on C. Therefore, I am curious in knowing. Here's my question: how do they configure production systems in order to get reasonable or 100% maybe consistency? In other words, the reads must factor latest write into account. No, stale reads.