Thank you Kishore, I made the buffer twice the size of the batch size and the latency has reduced significantly.
But is there only one thread io thread sending the batches? Can I increase the number of threads sending the batches so more than one batch could be sent at the same time? Thanks. On Thu, Aug 13, 2015 at 5:38 PM, Kishore Senji <kse...@gmail.com> wrote: > Your batch.size is 8196 and your buffer.memory is 67108864. This means > 67108864/8196 > ~ 8188 batches are in memory ready to the sent. There is only one thread io > thread sending them. I would guess that the io thread ( > kafka-producer-network-thread) would be busy. Please check it in visual vm. > > In steady state, every batch has to wait for the previous 8187 batches to > be done before it gets a chance to be sent out, but the latency is counted > from the time is added to the queue. This is the reason that you are seeing > very high end-to-end latency. > > Have the buffer.memory to be only twice that of the batch.size so that > while one is in flight, you can another batch ready to go (and the > KafkaProducer would block to send more when there is no memory and this way > the batches are not waiting in the queue unnecessarily) . Also may be you > want to increase the batch.size further more, you will get even better > throughput with more or less same latency (as there is no shortage of > events in the test program). > > On Thu, Aug 13, 2015 at 1:13 PM Yuheng Du <yuheng.du.h...@gmail.com> > wrote: > > > Yes there is. But if we are using ProducerPerformance test, it's > configured > > as giving input when running the test command. Do you write a java > program > > to test the latency? Thanks. > > > > On Thu, Aug 13, 2015 at 3:54 PM, Alvaro Gareppe <agare...@gmail.com> > > wrote: > > > > > I'm using last one, but not using the ProducerPerformance, I created my > > > own. but I think there is a producer.properties file in config folder > in > > > kafka.. is that configuration not for this tester ? > > > > > > On Thu, Aug 13, 2015 at 4:18 PM, Yuheng Du <yuheng.du.h...@gmail.com> > > > wrote: > > > > > > > Thank you Alvaro, > > > > > > > > How to use sync producers? I am running the standard > > ProducerPerformance > > > > test from kafka to measure the latency of each message to send from > > > > producer to broker only. > > > > The command is like "bin/kafka-run-class.sh > > > > org.apache.kafka.clients.tools.ProducerPerformance test7 50000000 100 > > -1 > > > > acks=1 bootstrap.servers=esv4-hcl198.grid.linkedin.com:9092 > > > > buffer.memory=67108864 batch.size=8196" > > > > > > > > For running producers, where should I put the producer.type=sync > > > > configuration into? The config/server.properties? Also Does this mean > > we > > > > are using batch size of 1? Which version of Kafka are you using? > > > > thanks. > > > > > > > > On Thu, Aug 13, 2015 at 3:01 PM, Alvaro Gareppe <agare...@gmail.com> > > > > wrote: > > > > > > > > > Are you measuring latency as time between producer and consumer ? > > > > > > > > > > In that case, the ack shouldn't affect the latency, cause even > tough > > > your > > > > > producer is not going to wait for the ack, the consumer will only > get > > > the > > > > > message after its commited in the server. > > > > > > > > > > About latency my best result occur with sync producers, but the > > > > throughput > > > > > is much lower in that case. > > > > > > > > > > About not flushing to disk I'm pretty sure that it's not an option > in > > > > kafka > > > > > (correct me if I'm wrong) > > > > > > > > > > Regards, > > > > > Alvaro Gareppe > > > > > > > > > > On Thu, Aug 13, 2015 at 12:59 PM, Yuheng Du < > > yuheng.du.h...@gmail.com> > > > > > wrote: > > > > > > > > > > > Also, the latency results show no major difference when using > ack=0 > > > or > > > > > > ack=1. Why is that? > > > > > > > > > > > > On Thu, Aug 13, 2015 at 11:51 AM, Yuheng Du < > > > yuheng.du.h...@gmail.com> > > > > > > wrote: > > > > > > > > > > > > > I am running an experiment where 92 producers is publishing > data > > > > into 6 > > > > > > > brokers and 10 consumer are reading online data simultaneously. > > > > > > > > > > > > > > How should I do to reduce the latency? Currently when I run the > > > > > producer > > > > > > > performance test the average latency is around 10s. > > > > > > > > > > > > > > Should I disable log.flush? How to do that? Thanks. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > Ing. Alvaro Gareppe > > > > > agare...@gmail.com > > > > > > > > > > > > > > > > > > > > > -- > > > Ing. Alvaro Gareppe > > > agare...@gmail.com > > > > > >
