MongoDB复制集（实现选举复制、故障切换、升级oplog大小、认证复制）
abc:SECONDARY> rs.help() //查看命令帮助手册 abc:SECONDARY> rs.printReplicationInfo()configured oplog> log length start to end: 1544secs (0.43hrs)
oplog first event time:Mon Jul 16 2018 05:49:12 GMT+0800 (CST)
oplog last event time: Mon Jul 16 2018 06:14:56 GMT+0800 (CST)
now: Mon Jul 16 2018 06:14:59 GMT+0800 (CST)
abc:SECONDARY> rs.printSlaveReplicationInfo()
source: 192.168.235.200:27018
syncedTo: Mon Jul 16 2018 06:16:16 GMT+0800 (CST)
0 secs (0 hrs) behind the primary
source: 192.168.235.200:27019
syncedTo: Mon Jul 16 2018 06:16:16 GMT+0800 (CST)
0 secs (0 hrs) behind the primary
abc:ARBITER> rs.printReplicationInfo()
cannot provide replication status from an arbiter.
//会发现仲裁节点并不具备数据复制
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