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Kafka >> mail # user >> Producer message ordering problem


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Re: Producer message ordering problem
I am curious. What is it about your design that requires you track order so tightly? Maybe there is another way to meet your needs instead of relying on Kafka to do it.

Philip

On Aug 22, 2013, at 9:32 PM, Ross Black <[EMAIL PROTECTED]> wrote:

> Hi,
>
> I am using Kafka 0.7.1, and using the low-level SyncProducer to send
> messages to a *single* partition from a *single* thread.
> The client sends messages that contain sequential numbers so it is obvious
> at the consumer when message order is shuffled.
> I have noticed that messages can be saved out-or-order by Kafka when there
> are connection problems, and am looking for possible solutions (I think I
> already know the cause).
>
> The client sends messages in a retry loop so that it will wait for a short
> period and then retry to send on any IO errors.  In SyncProducer, any
> IOException triggers a disconnect.  Next time send is called a new
> connection is established.  I believe that it is this disconnect/reconnect
> cycle that can cause messages to be saved to the kafka log in a different
> order to that of the client.
>
> I had previously had the same sort of issue with reconnect.interval/time,
> which was fixed by disabling those reconnect settings.
> http://mail-archives.apache.org/mod_mbox/kafka-users/201305.mbox/%3CCAM%2BbZhjssxmUhn_L%3Do0bGsD7PAXFGQHRpOKABcLz29vF3cNOzA%40mail.gmail.com%3E
>
> Is there anything in 0.7 that would allow me to solve this problem?  The
> only option I can see at the moment is to not perform retries.
>
> Does 0.8 handle this issue any differently?
>
> Thanks,
> Ross