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Kafka >> mail # user >> Is this a good overview of kafka?


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Re: Is this a good overview of kafka?
Hi Felix,

Would you mind elaborating on what you said regarding the ordering
guaranteed; inlined below.

Thanks,

stan

On Mon, Jan 14, 2013 at 6:08 PM, Felix GV <[EMAIL PROTECTED]> wrote:

>
> For example if you partitioned using a User ID field within the messages,
> you would be
> guaranteed that all messages pertaining to a certain user would end up in
> the same partition, and that they would be correctly ordered. You should be
> aware, however, that this guarantee is only maintained as long as there are
> no consumer re-balance (which happens when adding or removing a consumer or
> a broker).
>

Why would consumer re-balance or broker failure alter the above partition
invariant?