Thanks Jay. The producer metrics from jconsole is quite helpful. I've switched to the new producer and run producer benchmark with
*/usr/lib/kafka/bin/kafka-run-class.sh org.apache.kafka.clients.tools.ProducerPerformance topic1 500000000 1000 -1 acks=1 bootstrap.servers=node1:9092,node2:9092,node3:9092,node4:9092 buffer.memory=2097152000 batch.size=1000000 linger.ms <http://linger.ms>=100* so my message size is 1000 bytes (gave up on 100 bytes after fruitless experiments) and I've deliberately batched outgoing messages with the " linger.ms" conf. A single producer could send 300 MB/s on average and 3 producers almost saturated the network bandwidth. CPU is fully utilized for each producer thread. It seems that I can't go further in a single producer. Any thoughts ? Also, I've noticed this kafka-fast <https://github.com/gerritjvv/kafka-fast> project, who claimed producer throughput could reach 191975 K messages/s for 1KB message on 10GbE network. The difference is that a producer is created per topic partition. On Wed, Nov 19, 2014 at 12:34 PM, Jay Kreps <[email protected]> wrote: > Yeah this will involve some experimentation. > > The metrics are visible with jconsole or another jmx viewer. > > It may also be worth looking at the cpu usage per-thread (e.g. start top > and press 't' I think). > > Another simple test for broker vs client as the bottleneck is just to start > another producer or consumer and see if that improves throughput (if so it > is probably a client bottleneck). > > -Jay > > On Tue, Nov 18, 2014 at 4:44 PM, Manu Zhang <[email protected]> > wrote: > > > Thanks Jay for the quick response. > > > > Yes, it's a single producer and consumer both configured with multiple > > threads but I'm not using the new producer. > > CPU is typically 50% utilized on client and merely used on broker. Disks > > aren't busy either as a lot of data are cached in memory. > > Would you please give a link for the producer metrics you are referring > to > > ? > > > > Thanks, > > Manu > > > > On Wed, Nov 19, 2014 at 2:39 AM, Jay Kreps <[email protected]> wrote: > > > > > Hey Manu, > > > > > > I'm not aware of a benchmark on 10GbE. I'd love to see that though. > > Diving > > > into the results may help us find bottlenecks hidden by the slower > > network. > > > > > > Can you figure out where the bottleneck is in your test? I assume this > > is a > > > single producer and consumer instance and you are using the new > producer > > as > > > in those benchmarks? > > > > > > This can be slightly tricky as it can be cpu or I/O on either the > clients > > > or the brokers. You basically have to look at top, iostat, and the jmx > > > metrics for clues. The producer has good metrics that explain whether > it > > is > > > spending most of its time waiting or sending data. Not sure if there > is a > > > similar diagnostic for the consumer. > > > > > > -Jay > > > > > > On Tue, Nov 18, 2014 at 5:10 AM, Manu Zhang <[email protected]> > > > wrote: > > > > > > > Hi all, > > > > > > > > I have been trying out kafka benchmarks described in Jay's > > > > > benchmarking-apache-kafka-2-million-writes-second-three-cheap-machines > > > > < > > > > > > > > > > https://engineering.linkedin.com/kafka/benchmarking-apache-kafka-2-million-writes-second-three-cheap-machine > > > > >. > > > > I'm able to get similar results on a 4-node GbE network whose > in-bytes > > > > could be saturated at 120MB/s. However, on a 4-node, 10GbE network, I > > can > > > > not get in-bytes higher than 150MB/s. *Has anyone benchmarked kafka > on > > a > > > > 10GbE network ? Any rule of thumb on 10GbE network for configurations > > of > > > > broker, producer and consumer ? * > > > > > > > > My kafka version is 0.8.1.1 and I've created a topic with 8 > partitions > > > with > > > > 1 replica distributed evenly among the 4 nodes. Message size is 100 > > > bytes. > > > > I use all the default kafka settings. > > > > My cluster has 4 nodes, where each node has 32 cores, 128MB RAM and 3 > > > disks > > > > for kafka. > > > > > > > > I've tried increasing message size to 1000 bytes which improved > > > producer's > > > > throughput but not consumer's. > > > > > > > > > > > > Thanks, > > > > Manu > > > > > > > > > >
