Replica Set High Availability副本集高可用性¶

Replica sets use elections to support high availability.副本集使用选择来支持高可用性。

Replica Set Elections副本集选择

Elections occur when the primary becomes unavailable and the replica set members autonomously select a new primary.当主副本不可用并且副本集成员自主选择新的主副本时，会发生选择。

Rollbacks During Replica Set Failover副本集故障切换期间的回滚

A rollback reverts write operations on a former primary when the member rejoins the replica set after a failover.当成员在故障切换后重新加入副本集时，回滚会还原以前主服务器上的写入操作。