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From "Matthias J. Sax" <matth...@confluent.io>
Subject Re: Producer throughput with varying acks=0,1,-1
Date Fri, 16 Nov 2018 18:45:29 GMT
I you enable acks, it's not fire and forget any longer.

-Matthias

On 11/16/18 1:00 AM, Abhishek Choudhary wrote:
> Hi,
> 
> I have been doing some performance tests with kafka cluster for my project.
> I have a question regarding the send call and the 'acks' property of
> producer. I observed below numbers with below invocation of send call. This
> is a simple fire and forget call.
> 
> producer.send(record);
> 
> The topic has 5 partitions and I see below results with different acks
> value and replication factor. The kafka cluster has 5 nodes running with
> default values and using local disk
> 
> *acks                    Replication factor=1
> Replication factor=3*
> 0                             1330k msgs/sec
>      1260k msgs/sec
> 1                             1220k msgs/sec
>      1200k msgs/sec
> -1(all)                      1220k msgs/sec
>     325k msgs/sec
> 
> 
> As you can see as the acks value changes from 0 to all, the producer
> throughput decreases. What I am not able to understand is that if the
> producer send call is fire and forget in nature and producer is not waiting
> for any acknowledgements then why does the producer throughput drops as we
> move to stronger acks guarantees?
> 
> Any insights into how acks and producer send call works in Kakfa would be
> greatly appreciated.
> 
> Thanks,
> Abhishek
> 


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