043：集群=替换=主从复制 - 《Java基础回顾》

https://note.youdao.com/ynoteshare1/index.html?id=90101ebb9ab203f1103315c4dde893e5&type=note
主从复制：主写从读，哨兵监视主机
集群更加灵活，主从放一块，自动切换，集群超大用集群，中等规模主从复制
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集群作用：
1：分散单台服务器的访问压力。实现负载均衡
2: 分散单台服务器的存储压力，实现可扩展性
3：降低单台服务器宕机带来的业务灾难
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集群.txt 集群java.txt