the total message size of the batch should be less than message.max.bytes or is that for each individual message?
The former is correct. When you batch, I am assuming that the producer sends some sort of flag that this is a batch, and then the broker will split up those messages to individual messages and store them in the log correct? The broker splits the compressed message into individual messages to assign the logical offsets to every message, but the data is finally stored compressed and is delivered in the compressed format to the consumer. Thanks, Neha On Mon, Oct 7, 2013 at 9:26 AM, S Ahmed <sahmed1...@gmail.com> wrote: > When you batch things on the producer, say you batch 1000 messages or by > time whatever, the total message size of the batch should be less than > message.max.bytes or is that for each individual message? > > When you batch, I am assuming that the producer sends some sort of flag > that this is a batch, and then the broker will split up those messages to > individual messages and store them in the log correct? > > > On Mon, Oct 7, 2013 at 12:21 PM, Neha Narkhede <neha.narkh...@gmail.com > >wrote: > > > The message size limit is imposed on the compressed message. To answer > your > > question about the effect of large messages - they cause memory pressure > on > > the Kafka brokers as well as on the consumer since we re-compress > messages > > on the broker and decompress messages on the consumer. > > > > I'm not so sure that large messages will have a hit on latency since > > compressing a few large messages vs compressing lots of small messages > with > > the same content, should not be any slower. But you want to be careful on > > the batch size since you don't want the compressed message to exceed the > > message size limit. > > > > Thanks, > > Neha > > > > > > On Mon, Oct 7, 2013 at 9:10 AM, S Ahmed <sahmed1...@gmail.com> wrote: > > > > > I see, so that is one thing to consider is if I have 20 KB messages, I > > > shouldn't batch too many together as that will increase latency and the > > > memory usage footprint on the producer side of things. > > > > > > > > > On Mon, Oct 7, 2013 at 11:55 AM, Jun Rao <jun...@gmail.com> wrote: > > > > > > > At LinkedIn, our message size can be 10s of KB. This is mostly > because > > we > > > > batch a set of messages and send them as a single compressed message. > > > > > > > > Thanks, > > > > > > > > Jun > > > > > > > > > > > > On Mon, Oct 7, 2013 at 7:44 AM, S Ahmed <sahmed1...@gmail.com> > wrote: > > > > > > > > > When people using message queues, the message size is usually > pretty > > > > small. > > > > > > > > > > I want to know who out there is using kafka with larger payload > > sizes? > > > > > > > > > > In the configuration, the maximum message size by default is set > to 1 > > > > > megabyte ( > > > > > message.max.bytes1000000) > > > > > > > > > > My message sizes will be probably be around 20-50 KB but to me that > > is > > > > > large for a message payload so I'm wondering what effects that will > > > have > > > > > with kafka. > > > > > > > > > > > > > > >
