muralibasani commented on code in PR #22263: URL: https://github.com/apache/kafka/pull/22263#discussion_r3244033155
########## docs/getting-started/upgrade.md: ########## @@ -38,6 +38,14 @@ type: docs ### Upgrading Servers to 4.3.0 from any version 3.3.x through 4.2.0 +Note: Apache Kafka 4.3 only supports KRaft mode - ZooKeeper mode has been removed. As such, **broker upgrades to 4.3.0 (and higher) require KRaft mode and the software and metadata versions must be at least 3.3.x** (the first version when KRaft mode was deemed production ready). For clusters in KRaft mode with versions older than 3.3.x, we recommend upgrading to 3.9.x before upgrading to 4.3.x. Clusters in ZooKeeper mode have to be [migrated to KRaft mode](/43/operations/kraft/#zookeeper-to-kraft-migration) before they can be upgraded to 4.3.x. + +**For a rolling upgrade:** + + 1. Upgrade the brokers one at a time: shut down the broker, update the code, and restart it. Once you have done so, the brokers will be running the latest version and you can verify that the cluster's behavior and performance meet expectations. Review Comment: ```suggestion 1. Upgrade the brokers one at a time: shut down the broker, update the code, and restart it. Once you have done so, the brokers will be running the latest version and you can verify that the cluster's behavior and performance meet expectations. ``` nit - this space indentation is not consistent with 4.2 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
