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Compatibility, Deprecation, and Migration Plan

• Client Behaviors Changes

  • Bootstrap upon first NetworkClient.poll() instead of in the constructor.

  • Bootstrapping is retriable.

  • KafkaConsumer: Users can retry bootstrapping via poll() if it fails. Each retry will be bounded by either the poll timer or the bootstrap timer, whichever expires first.

  • KafkaAdminClient: Bootstrap exception is thrown when user tries to materialize the result future. The retry is bounded by the API timeout.

  • KafkaProducer: Bootstrap will be done in the background thread. If the client has not been bootstrapped when the user attempts to send a message, it can wait up to the maximum block timer or until the bootstrap is complete, whichever expires first.

  Exception Handling

  • Failed DNS resolution will result in NetworkException

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