Thank you Jay, that really helps! Kishore, Where you can monitor whether the network is busy on IO in visual vm? Thanks. I am running 90 producer process on 90 physical machines in the experiment.
On Tue, Aug 18, 2015 at 1:19 AM, Jay Kreps <j...@confluent.io> wrote: > Yuheng, > > From the command you gave it looks like you are configuring the perf test > to send data as fast as possible (the -1 for target throughput). This means > it will always queue up a bunch of unsent data until the buffer is > exhausted and then block. The larger the buffer, the bigger the queue. This > is where the latency comes from. This is exactly what you would expect and > what the buffering is supposed to do. > > If you want to measure latency this test doesn't really make sense, you > need to measure with some fixed throughput. Instead of -1 enter the target > throughput you want to measure latency at (e.g. 100000 records/sec). > > -Jay > > On Thu, Aug 13, 2015 at 12:18 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 > > > > > >
