Suppose I have two Datacentres with DC1 nodes =3 RF=2 , DC2 nodes=4 RF=2. since my data is distributed all across nodes in the cluster.
what if DC1 fails / or is down as RF=2 for DC1 so data present in DC1 is not replicated to any node in DC2? so how we will recover data present in DC1?
secondly, can it happen that when i define RF=2 for DC1 it will find replica within same DC. can replicas be present across DC also?
I mean if i define RF=2 for DC1 can one replica be there in DC2 or all be in DC1 only?
if yes, then how ?