Note that the key is provided by the application. Kafka itself makes no
effort to make sure messages are in key order.

Thanks,

Jun


On Mon, May 13, 2013 at 8:34 AM, Yu, Libo <libo...@citi.com> wrote:

> Thanks for both of you. The key is actually very useful. If the key
> increases
> monotonically, it can be used as the version of the message. Say version 1
> is sent first followed by version 2. It is possible that version 2 is
> received first
> by the consumer. When version 1 is received, it will be ignored if version
> 2
> has already been received.
>
>
> Regards,
>
> Libo
>
>

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