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Transaction support should be sufficient to achieve idempotence. However, a producer will need to buffer messages of the transaction until it receives the commit response for that transaction. We can avoid this need to buffer by incorporating sequence numbers in the message header and incorporating pieces of the original idempotent producer proposal. In fact, we would probably want to have some form of the idempotent producer to be available (stand-alone) to avoid aborting long-running transactions that run into (say) a temporary network glitch during the data send phase.