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  • SSL configs will be updated by reconfiguring ChannelBuilder and creating a new SslFactory. If SSL is used for inter-broker communication, inconsistent changes (e.g changing CA) should be made by adding a new listener with the new properties. This is true for SASL as well.
  • SASL configuration updates will be supported using the dynamic JAAS configuration option sasl.jaas.config
  • Updates to advertised.listeners will re-register the new listener in ZK. This update will be not allowed for the listener used in inter-broker communication. In addition to this, AdminClient will not allow updates to the listener that was used to make the alter request.
  • When changes are made to listeners, additional logic will be required in the controller to broadcast the updated metadata to all brokers.

 Limitations:

  • Configuration updates will not be allowed for the listener used in inter-broker communication. To update inter-broker configs without restarting the broker, a new listener can be created with new configs and the inter-broker listener can be changed to the new listener (similar to the currently documented security upgrade process).

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