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Posted to users@kafka.apache.org by Dominik Safaric <do...@gmail.com> on 2016/11/14 18:06:12 UTC

Kafka consumer offset uniqueness

Hi all, 

I've been wondering- is the offset gotten with ConsumerRecord<>().offset() always unique for each partition? Asking because while I've been running a consumer group, I've observed that for example I had offset values equal to zero more times then there is the number of Kafka partitions. 

Thanks in advance, 

Dominik Šafarić

Re: Kafka consumer offset uniqueness

Posted by Zakee <kz...@netzero.net>.

Yes, offsets are unique per partition.

> I've observed that for example I had offset values equal to zero more times then there is the number of Kafka partitions. 
Can you elaborate a little more what you observed?

-Zakee

> On Nov 14, 2016, at 10:06 AM, Dominik Safaric <do...@gmail.com> wrote:
> 
> Hi all, 
> 
> I've been wondering- is the offset gotten with ConsumerRecord<>().offset() always unique for each partition? Asking because while I've been running a consumer group, I've observed that for example I had offset values equal to zero more times then there is the number of Kafka partitions. 
> 
> Thanks in advance, 
> 
> Dominik Šafarić

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