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Comment: Link to pages describing solutions to the OutOfOrderSequence and message format compatibility problems

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Currently, the idempotent producer requires max.in.flight.requests.per.connection=1 for correctness reasons. We will need to make client and broker changes to support max.in.flight.requests.per.connection > 1 with the idempotent producer. The details of the changes required are in this ticket.

We would also need the changes described in these documents:
  1. Kafka Exactly Once - Solving the problem of spurious OutOfOrderSequence errors
  2. Kafka Exactly Once - Dealing with older message formats when idempotence is enabled
No other code changes will be necessary. 

Performance considerations

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