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Amazon MSK adds support for Apache Kafka version 4.1

Published
October 15, 2025
https://aws.amazon.com/about-aws/whats-new/2025/10/amazon-msk-apache-kafka-version-4-1

Amazon MSK Apache Kafka 4.1 Support

Amazon Managed Streaming for Apache Kafka (Amazon MSK) now supports Apache Kafka version 4.1, introducing Queues as a preview feature, a new Streams Rebalance Protocol in early access, and Eligible Leader Replicas (ELR). Along with these features, Apache Kafka version 4.1 includes various bug fixes and improvements.

New Features

  • Queues: Use multiple consumers to process messages from the same topic partitions, improving parallelism and throughput for workloads that need point-to-point message delivery.
  • Streams Rebalance Protocol: Extends broker coordination capabilities to Kafka Streams for optimized task assignments and rebalancing.
  • Eligible Leader Replicas (ELR): Enabled by default to strengthen availability.

What to do

  • Select version 4.1.x when creating a new cluster via the AWS Management Console, AWS CLI, or AWS SDKs.
  • Upgrade existing MSK provisioned clusters with an in-place rolling update.
  • Refer to the Amazon MSK Developer Guide for more details.

Source: AWS release notes




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