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The implementation included in Kafka will obtain user credentials from Zookeeper. Credentials Dynamic config update handlers will not be cached in the broker in the initial implementation, since they are only required to authenticate new client connections. Caching may be added in future if requiredbe used to maintain a cache of valid credentials in the broker.

For production use, the login modules and server/client implementations can be replaced if required with an alternative implementation that stores credentials more securely.

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