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如题，Mongo集群间同步资料是依据什么原理保持各节点的数据一致？
MongoDB複本集資料同步](https://docs.mongodb.com/manual/core/replica-set-sync/)主要包含2個步驟
1. intial sync，可以理解為全量同步
2. replication，追同步源的oplog，可以理解為增量同步
与 萌阔论坛 的连接断开，我们正在尝试重连，请耐心等待
