You can now scale your Amazon Managed Streaming for Apache Kafka (MSK) clusters on demand by changing the size or family of your brokers without reassigning Apache Kafka partitions. Changing the size or family of your brokers gives you the flexibility to adjust your MSK cluster’s compute capacity based on changes in your workloads, without interrupting your cluster I/O. In just a few clicks, you can scale up or scale down your Amazon MSK clusters’ compute capacity that includes CPU, memory, network throughput and I/O capacity. You will be charged for the chosen broker size or family per Amazon MSK standard pricing.
Source:: Amazon AWS