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• What impact (if any) will there be on existing users?
  • existing ACLs with CREATE permission on Cluster will still allow users to create any topics 
  • clients expecting an error in CreateTopicResponse will receive TOPIC_AUTHORIZATION_FAILED(29) instead of CLUSTER_AUTHORIZATION_FAILED (31).
    in the Java client, both are mapped to subclasses of AuthorizationException;
    handling any auth error likely requires human intervention intervention.
• If we need special migration tools, describe them here.
  • not needed

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