Before you begin the upgrade process, you need to explicitly set the Kafka protocol
version to match what's being used currently among the brokers and clients. Update
server.properties on all brokers as follows:
Log in to Ambari.
Choose the Kafka service.
Select the Configs page.
Find the Custom kafka-broker section.
Add the following properties:
inter.broker.protocol.version=current_Kafka_versionlog.message.format.version=current_Kafka_version
Replace current_Kafka_version with the version of Apache
Kafka currently being used, in case of HDP-2.6.5 it is
1.0.
Save your changes. The information is automatically copied to each
broker.
important
Once the Kafka log format and protocol version
configurations (the inter.broker.protocol.version and
log.message.format.version properties) are set to the new version (or
left blank, which means to use the latest version), Kafka rollback is
not possible.
