Thank you Eno,
Adding more threads extremely increased the throughput of stream. As I said
after processing I send the event to another topic. For that I was opening
a connection via KafkaProducer to the cluster and I think that was the
issue. Now there is just one producer for sending events to output topic.
Do you have any recommendation how that part can get better?
Thank you so much,
Saeed
On Thu, Jun 9, 2016 at 3:33 PM, Eno Thereska <eno.there...@gmail.com> wrote:
> Hi Saeed,
>
> There could be several reasons why things appear slow and it is difficult
> to say without knowing the exact details of the setup and the results you
> are observing.
> One thing to check is the number of threads you have assigned to the Kafka
> Stream application. By default just one thread is used. Perhaps you want
> more (depending on number of cores you have). An example way to change that
> in your app:
>
> props.put(StreamsConfig.NUM_STREAM_THREADS_CONFIG, 4 /* four threads */);
>
> Thanks
> Eno
>
> > On 9 Jun 2016, at 18:08, Saeed Ansari <saeed.ans...@gmail.com> wrote:
> >
> > Hi Eno,
> > Thank you for the response. Actually I did not know it automatically
> > assigns partitions to consumers. Now I have one Kafkastream reading from
> > 12 partitions, like below:
> > Controller is an actor that I am sending the message to and then it
> creates
> > child actors to send messages out.
> >
> > builder.stream("test").foreach((x, y) -> {
> > controller.tell(y, controller.noSender());
> > });
> >
> >
> > The msg/sec rate I get from receiving messages to sending them out is
> > really slow!
> >
> > Do you think it is about how consume messages?
> >
> > Thank you,
> > Saeed
> >
> >
> >
> > On Wed, Jun 8, 2016 at 3:08 AM, Eno Thereska <eno.there...@gmail.com>
> wrote:
> >
> >> Hi Saeed,
> >>
> >> Kafka Streams takes care of assigning partitions to consumers
> >> automatically for you. You don't have to write anything explicit to do
> >> that. See WordCountDemo.java as an example. Was there another reason you
> >> wanted control over partition assignment?
> >>
> >> Thanks
> >> Eno
> >>
> >>> On 7 Jun 2016, at 20:02, Saeed Ansari <saeed.ans...@gmail.com> wrote:
> >>>
> >>> Hi,
> >>> I have started a small Kafka streaming application. I need to assign
> >>> partitions to consumers in a consumer group. I am not sure where to
> start
> >>> and how to structure consumer groups in KafkaStreams.
> >>>
> >>> I found that there is a StreamPartitionAssignor that can be added to
> >>> config, but still I do not know how to configure it and what parameters
> >> to
> >>> config.
> >>>
> >>> Any help is really appreciated.
> >>>
> >>> Thank you,
> >>> Saeed
> >>
> >>
>
>
