I have a recent Kafka cluster which uses Kraft. I am facing some problems with it and it is possibly due to use of Kraft. I wish to switch to Zookeeper without losing data. Downtime is okay. How do I go about it?
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I'm afraid there isn't a documented process to downgrade a cluster from KRaft to ZooKeeper.
If you've found an issue with KRaft, you should report it to the Kafka project via a Jira ticket so it can get fixed.
Assuming your KRaft cluster is somewhat functional, a way to preserve your data is to create a new cluster (running ZooKeeper) and use a tool like MirrorMaker to migrate your data.