Migration of data from slave to master in Redis Cluster

Question

I'm currently exploring Redis cluster. I've started 6 instances on 3 physical servers(3 master and 3 slaves) with persistence enabled.

I've noticed that when I kill one of the master instances then it's slave is promoted to master after some time. However, it remains as master even when I start the killed instance.

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 .

Will this data get replicated to the new master(initially slave), once the instance comes back up?

Answer 1

NO. If the master haven't replicate data to slave, the data will be lost. When the old master recovers, it will be become a slave of some other node based on some rules . Then the old master will replicate data from its new master.