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From Yuanjia <yuanjia8...@163.com>
Subject Re: Re: when will the messsages be sent to broker
Date Thu, 02 Mar 2017 06:50:44 GMT
Hi Matthias,
I check my testing procedure again and again. I find a problem in that. 
I start a producer in debug mode and the breakpoint is suspended to all thread. It maybe block
producing thread. 
After change to suspend to the main thread, the message is sent out immediately.


Yuanjia Li
From: Matthias J. Sax
Date: 2017-03-02 13:11
To: users
Subject: Re: when will the messsages be sent to broker
That's weird. If batch.size=0 and linger.ms=0 records should get send
out immediately.
buffer.memory is an upper bound for the overall memory. If you write to
multiple partitions, there will be a buffer for each partitions and
buffer.memory is shared over all buffers. Furthermore, if you exceed
buffer.memory your call to Producer#send will block (until it might time
out). I don't think you want to set it to zero.
How do you monitor your Producer to come to the conclusion it's not
sending immediately?
On 3/1/17 6:30 PM, Yuanjia wrote:
> Hi,
> Records are not sent out  immediately, even if configing batch.size=0 and linger.ms=0,
They are buffered in the memory(buffer.memory).
> I don't want to do sync writes by future.get, which performance is not good.
> Have any configure can increase sending frequency? config buffer.memory=0?
> Thanks.
> Yuanjia Li
> From: Matthias J. Sax
> Date: 2017-03-02 01:42
> To: users
> Subject: Re: when will the messsages be sent to broker
> There is also linger.ms parameter that is an upper bound how long a (not
> yet filled) buffer is hold before sending it even if it's not full.
> Furthermore, you can do sync writes and block until producer received
> all acks. But it might have a performance penalty.
> http://docs.confluent.io/current/clients/producer.html#synchronous-writes
> -Matthias
> On 3/1/17 6:55 AM, Kaufman Ng wrote:
>> By default producer batches records (into a buffer) until batch.size is
>> reached, then records will be sent out.  Try lowering batch.size in your
>> producer config.
>> You might want to look at the producer javadoc here:
>> http://kafka.apache.org/0102/javadoc/index.html?org/apache/kafka/clients/producer/KafkaProducer.html
>> On Wed, Mar 1, 2017 at 3:14 AM, Yuanjia <yuanjia8947@163.com> wrote:
>>> Hi all,
>>> When will the messsages be sent in kafka0.10.0?If I use KafkaProducer.send
>>> to send one message, the messsages isn't sent immediately except invoke
>>> flush or close.
>>> Thanks.
>>> Yuanjia Li
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