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Posted to users@kafka.apache.org by Mark Horton <ma...@nostromo.net> on 2019/01/06 17:00:28 UTC

message ordering within a transaction

I was curious if re-ordering is possible within a transaction? Let's
say a KafkaProducer sends 1000 messages to a single partition within a
single transaction, and the total size causes more than 1 batch to be
sent to the broker. If, for some reason, one of the batches is lost
and resent, is it possible this will cause messages to be re-ordered
within the transaction?

Mark

Re: message ordering within a transaction

Posted by "Matthias J. Sax" <ma...@confluent.io>.

For this case no reordering will occur, but the original send order will
be preserved.

This is even true without transactions if you use idempotent producer.

-Matthias

On 1/6/19 6:00 PM, Mark Horton wrote:
> I was curious if re-ordering is possible within a transaction? Let's
> say a KafkaProducer sends 1000 messages to a single partition within a
> single transaction, and the total size causes more than 1 batch to be
> sent to the broker. If, for some reason, one of the batches is lost
> and resent, is it possible this will cause messages to be re-ordered
> within the transaction?
> 
> Mark
>