But shouldn't I see a separate thread per broker (I am using the async mode)? Why do I get a better performance sending a message that has fewer partitions?
On Wed, Jan 1, 2014 at 2:22 PM, Gerrit Jansen van Vuuren < gerrit...@gmail.com> wrote: > The producer is heavily synchronized (i.e. all the code in the send method > is encapsulated in one huge synchronized block). > Try creating multiple producers and round robin send over them. > > e.g. > > p = producers[ n++ % producers.length ] > > p.send msg > This will give you one thread per producer instance. > > I'm working on an async multi threaded producer for kafka, but its nothing > near complete yet. > https://github.com/gerritjvv/kafka-fast > > > Regards, > Gerrit > > > On Wed, Jan 1, 2014 at 1:17 PM, yosi botzer <yosi.bot...@gmail.com> wrote: > > > Hi, > > > > I am using kafka 0.8. I have 3 machines each running kafka broker. > > > > I am using async mode of my Producer. I expected to see 3 different > threads > > with names starting with ProducerSendThread- (according to this article: > > http://engineering.gnip.com/kafka-async-producer/) > > > > However I can see only one thread with the name *ProducerSendThread-* > > > > This is my producer configuration: > > > > server=1 > > topic=dat7 > > metadata.broker.list= > > ec2-54-245-111-112.us-west-2.compute.amazonaws.com:9092 > > ,ec2-54-245-111-69.us-west-2.compute.amazonaws.com:9092, > > ec2-54-218-183-14.us-west-2.compute.amazonaws.com:9092 > > serializer.class=kafka.serializer.DefaultEncoder > > request.required.acks=1 > > compression.codec=snappy > > producer.type=async > > queue.buffering.max.ms=2000 > > queue.buffering.max.messages=1000 > > batch.num.messages=500 > > > > > > *What am I missing here?* > > > > > > BTW, I have also experienced very strange behavior regrading my producer > > performance (which may or may not be related to the issue above). > > > > When I have defined a topic with 1 partition I got much better throughput > > comparing to a topic with 3 partitions. A producer sending messages to a > > topic with 3 partitions had much better throughput comparing to a topic > > with 12 partitions. > > > > I would expect to have best performance for the topic with 12 partitions > > since I have 3 machines running a broker each of with 4 disks (the broker > > is configured to use all 4 disks) > > > > *Is there any logical explanation for this behavior?* > > >
