cmccabe commented on code in PR #17447: URL: https://github.com/apache/kafka/pull/17447#discussion_r1796128430
########## docs/upgrade.html: ########## @@ -45,6 +107,67 @@ <h5><a id="upgrade_390_notable" href="#upgrade_390_notable">Notable changes in 3 <h4><a id="upgrade_3_8_0" href="#upgrade_3_8_0">Upgrading to 3.8.0 from any version 0.8.x through 3.7.x</a></h4> + <h5><a id="upgrade_380_zk" href="#upgrade_380_zk">Upgrading ZooKeeper-based clusters</a></h5> + <p><b>If you are upgrading from a version prior to 2.1.x, please see the note in step 5 below about the change to the schema used to store consumer offsets. + Once you have changed the inter.broker.protocol.version to the latest version, it will not be possible to downgrade to a version prior to 2.1.</b></p> + + <p><b>For a rolling upgrade:</b></p> + + <ol> + <li>Update server.properties on all brokers and add the following properties. CURRENT_KAFKA_VERSION refers to the version you + are upgrading from. CURRENT_MESSAGE_FORMAT_VERSION refers to the message format version currently in use. If you have previously + overridden the message format version, you should keep its current value. Alternatively, if you are upgrading from a version prior + to 0.11.0.x, then CURRENT_MESSAGE_FORMAT_VERSION should be set to match CURRENT_KAFKA_VERSION. + <ul> + <li>inter.broker.protocol.version=CURRENT_KAFKA_VERSION (e.g. <code>3.7</code>, <code>3.6</code>, etc.)</li> + <li>log.message.format.version=CURRENT_MESSAGE_FORMAT_VERSION (See <a href="#upgrade_10_performance_impact">potential performance impact + following the upgrade</a> for the details on what this configuration does.)</li> + </ul> + If you are upgrading from version 0.11.0.x or above, and you have not overridden the message format, then you only need to override Review Comment: We don't support upgrading from Kafka 0.11.0 any more. The oldest version we can safely upgrade from is Kafka 2.4.0. We should also specify that ZooKeeper should be upgraded to 3.8.3 prior to the upgrade. -- 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]
