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We have also added the LSO to the fetch response. In READ_COMMMITED, the consumer will use this to compute lag instead of the high watermark. Note also the addition of the field for aborted transactions. This is used by the consumer in READ_COMMITTED mode to know where aborted transactions begin. This allows the consumer to discard the aborted transaction data without buffering until the associated marker is read.

ProduceRequest/Response

Sent by the producer to any brokers to produce messages. Instead of allowing the protocol to send multiple message sets for each partition, we modify the schema to allow only one message set for each partition. This allows us to remove the message set size since each message set already contains a field for the size. More importantly, since there is only one message set to be written to the log, partial produce failures are no longer possible. The full message set is either successfully written to the log (and replicated) or it is not.

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