Hello Mike Likely your existing 3 Zookeeper nodes can serve your expansion requirements You can monitor the CPU and network of the Zookeeper nodes when your Kafka cluster is growing, when reaching the throughput limit, you can expand your zookeeper to 5 nodes Remember the zookeeper nodes need to keep in sync all the time, so the more zookeeper nodes the more traffic will be added to keep them in sync, while those nodes handling the Kafka requests; so it doesn't mean the more the better I would suggest to stay with 3 zookeeper nodes while expanding your kafka cluster with close monitoring, and consider to grow to 5 when the CPU/network throughput reaching the limit You can also consider to tune the zookeeper nodes e.g. dedicated disks, better network throughput, isolate zookeeper process, disable swaps
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