We are on Cassandra 3.7 and have a 12 node cluster , 2DC, with 6 nodes in each DC. RF=3 We have around 150M rows across tables.
We are planning to add more nodes to the cluster, and thinking of changing the replication factor to 5 for each DC. Our application uses the below consistency level read-level: LOCAL_ONE write-level: LOCAL_QUORUM if we change the RF=5 on live cluster, and run full repairs, would we see read/write errors while data is being replicated? if so, This is not something that we can afford in production, so how would we avoid this?