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The first step of the migration is to upgrade the cluster to at least the bridge release version. This will also include setting the metadata.version to the one specified in this KIP. Upgrading the cluster to a well known starting point will reduce our compatibility matrix and ensure that the necessary logic is in place prior to the migration. As mentioned in the "Migration Trigger" section, we must also upgrade the cluster to the metadata.version introduced by this KIP.

Controller Migration

A new set of nodes will be provisioned to host the controller quorum. These controllers will be started with kafka.metadata.migration.enable set to “true”. Once the quorum is established and a leader is elected, the migration process will begin. The ZK data migration will copy the existing ZK data into the KRaft metadata log and establish the new KRaft active controller as the active controller from a ZK perspective.

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