在Redis Cluster中将数据从从服务器迁移到主服务器
[英]Migration of data from slave to master in Redis Cluster
问题描述
I'm currently exploring Redis cluster. 
我目前正在探索Redis集群。 I've started 6 instances on 3 physical servers(3 master and 3 slaves) with persistence enabled. 我已经在3个物理服务器（3个主服务器和3个从属服务器）上启用了持久性，开始了6个实例。
I've noticed that when I kill one of the master instances then it's slave is promoted to master after some time. 我注意到，当我杀死一个主实例时，它的从属将在一段时间后提升为主。 However, it remains as master even when I start the killed instance. 但是，即使我启动被杀死的实例，它也remains as master 。
Since, Redis does asynchronous replication, therefore, I was thinking of a scenario where the master, immediately after flushing the data is killed ie it wasn't able to replicate that data . 由于Redis进行异步复制，因此，我想到了这样一种情况，即在刷新数据后立即将主服务器杀死，即it wasn't able to replicate that data 。
Will this data get replicated to the new master(initially slave), once the instance comes back up?
1 个解决方案
解决方案1
1 已采纳 2019-03-05 10:35:47
NO. 没有。 If the master haven't replicate data to slave, the data will be lost. 如果主服务器尚未将数据复制到从服务器，则数据将丢失。 When the old master recovers, it will be become a slave of some other node based on some rules . 当旧的主机恢复后，它将根据某些规则成为其他节点的从机。 Then the old master will replicate data from its new master. 然后，旧的主服务器将从其新的主服务器复制数据。
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