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Case #2: If the IBP is greater than or equal to migration_ibp_version (see migration section), then, it means the software has been upgraded to a state where it supports this KIP, and the versioning system is activeis activated when the controller is being started. In such a case, the controller would bootstrap/create the ZK node for the first time containing a map of {feature_name → {min_feature_version, max_feature_version}} (this is a blocking write that needs to succeed for the controller to continue its startup sequence). The data populated in the node is obtained by the controller service from the broker's supported features. This approach brings convenience, as the controller finalizes the default min/max feature version levels automatically.

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