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 This KIP provides a mechanism to change any broker config dynamically but identifying which configs can be changed and how the config changes should be applied within the brokers is out of scope. 

ConfigDef Changes

We will need to add a new property to the ConfigKey to indicate if a config is updatable or not. This property can be used to generate documentation so it becomes very easy to discover which properties can be dynamically changed. If a broker property is set in zookeeper and it is not a config marked "isDynamic", that property can simply be ignored. This is similar to configuring Kafka with a property it does not understand.

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