MongoDB復(fù)制集原理
https://mongoing.com/archives/2155

mongDB replication
https://docs.mongodb.com/manual/replication
跨兩個(gè)或多個(gè)數(shù)據(jù)中心分布的副本集
Replica Sets Distributed Across Two or More Data Centers
https://docs.mongodb.com/manual/core/replica-set-architecture-geographically-distributed
zk 三個(gè)節(jié)點(diǎn)的情況下,掛掉節(jié)點(diǎn)會(huì)發(fā)生什么?