Chapter 4. Technology Previews

Technology Preview features included with AMQ Streams 2.5.


Technology Preview features are not supported with Red Hat production service-level agreements (SLAs) and might not be functionally complete; therefore, Red Hat does not recommend implementing any Technology Preview features in production environments. This Technology Preview feature provides early access to upcoming product innovations, enabling you to test functionality and provide feedback during the development process. For more information about the support scope, see Technology Preview Features Support Scope.

4.1. KRaft mode

Apache Kafka is in the process of phasing out the need for ZooKeeper. You can now try deploying a Kafka cluster in KRaft (Kafka Raft metadata) mode without ZooKeeper as a technology preview.


This mode is intended only for development and testing, and must not be enabled for a production environment.

Currently, the KRaft mode in AMQ Streams has the following major limitations:

  • Moving from Kafka clusters with ZooKeeper to KRaft clusters or the other way around is not supported.
  • Upgrades and downgrades of Apache Kafka versions are not supported.
  • JBOD storage with multiple disks is not supported.
  • Many configuration options are still in development.

See Running Kafka in KRaft mode.

4.2. Kafka Static Quota plugin configuration

Use the technology preview of the Kafka Static Quota plugin to set throughput and storage limits on brokers in your Kafka cluster. You can set a byte-rate threshold and storage quotas to put limits on the clients interacting with your brokers.

Example Kafka Static Quota plugin configuration

client.quota.callback.class= io.strimzi.kafka.quotas.StaticQuotaCallback
client.quota.callback.static.produce= 1000000
client.quota.callback.static.fetch= 1000000 400000000000 500000000000 5

See Setting limits on brokers using the Kafka Static Quota plugin.