协议的复杂更让数据⼀致性成为程序员大牛们吹水的 Nacos 架构 < 68 常见话题。不过从协议层面上看，⼀致性的选型已经很长时间没有新的成员加入了。目前来看基本 可以归为两家：⼀种是基于 Leader 的非对等部署的单点写⼀致性，⼀种是对等部署的多写⼀致性。 当我们选用服务注册中心的时候，并没有⼀种协议能够覆盖所有场景，例如当注册的服务节点不会 定时发送心跳到注册中心时，强⼀致协议看起来 ⼀致性时，使用⼀个代理，通过可控制的规则进行转发。 目前的⼀致性协议实现，⼀个是基于简化的 Raft 的 CP ⼀致性，⼀个是基于自研协议 Distro 的 AP ⼀致性。Raft 协议不必多言，基于 Leader 进行写入，其 CP 也并不是严格的，只是能保证⼀ 半所见⼀致，以及数据的丢失概率较小。Distro 协议则是参考了内部 ConfigServer 和开源 Eureka， 在不借助第三方存储 跨地域延迟要求能够在每个地域都部署集群的时候，我们现有的方案有多机房容灾、异地多活、多 数据中心等。 77 > Nacos 架构 图 8 Nacos 的多机房部署和容灾 首先是双机房容灾，基于 Leader 写的协议不做改造是无法支持的，这意味着 Zookeeper 不能在 没有人工干预的情况下做到双机房容灾。在单机房断网情况下，使机房内服务可用并不难，难的是 如何在断网恢复后做数据聚合，Zookeeper

Listener type. spring.kafka.producer.acks= # Number of acknowledgments the producer requires the leader to have received before considering a request complete. spring.kafka.producer.batch-size= # Number

Listener type. spring.kafka.producer.acks= # Number of acknowledgments the producer requires the leader to have received before considering a request complete. spring.kafka.producer.batch-size= # Number

the consumer. spring.kafka.producer.acks= # Number of acknowledgments the producer requires the leader to have received before considering a request complete. spring.kafka.producer.batch-size= # Number

the consumer. spring.kafka.producer.acks= # Number of acknowledgments the producer requires the leader to have received before considering a request complete. spring.kafka.producer.batch-size= # Default

polling the consumer. spring.kafka.producer.acks= # Number of acknowledgments the producer requires the leader to have received before considering a request complete. spring.kafka.producer.batch-size= # Default

polling the consumer. spring.kafka.producer.acks= # Number of acknowledgments the producer requires the leader to have received before considering a request complete. spring.kafka.producer.batch-size= # Default

the consumer. spring.kafka.producer.acks= # Number of acknowledgments the producer requires the leader to have received before considering a request complete. spring.kafka.producer.batch-size= # Default

the consumer. spring.kafka.producer.acks= # Number of acknowledgments the producer requires the leader to have received before considering a request complete. spring.kafka.producer.batch-size= # Default

polling the consumer. spring.kafka.producer.acks= # Number of acknowledgments the producer requires the leader to have received before considering a request complete. spring.kafka.producer.batch-size= # Default