Hi, I would like to migrate my Kafka setup from old servers to new servers. Let say I have 8 really old servers that have the kafka topics/partitions replicated 4 ways and want to migrate the data to 4 brand new servers and want the replication factor be 3. I wonder if anyone has ever performed this type of migration?
Will auto rebalancing take care of this automatically if I do the following? Let say I bring down old broker id 1 down and startup new server broker id 100 up, is there a way to migrate all of the data of the topic that had the topic (where borker id 1 was the leader) over to the new broker 100? Or do I need to use *bin/kafka-preferred-replica-election.sh *to reassign the topics/partitions from old broker 1 to broker 100? And then just keep doing the same thing until all of the old brokers are decommissioned? Also, would kafka-preferred-replica-election.sh let me actually lower the number of replicas as well, if I just simply make sure that given topic/partition was only elected 3 times versus 4? Thanks for your insight, Marcin
