can someone please explain why latency is so big for me？thanks
> 在 2016年6月25日，下午11:16，Jay Kreps <j...@confluent.io> 写道：
>
> Can you sanity check this with the end-to-end latency test that ships with
> Kafka in the tools package?
>
> https://apache.googlesource.com/kafka/+/1769642bb779921267bd57d3d338591dbdf33842/core/src/main/scala/kafka/tools/TestEndToEndLatency.scala
>
> On Saturday, June 25, 2016, Kafka <kafka...@126.com> wrote:
>
>> Hi all，
>> my kafka cluster is composed of three brokers with each have 8core
>> cpu and 8g memory and 1g network card.
>> with java async client，I sent 1000000 messages with size of 1024
>> bytes per message ,the send gap between each sending is 20us，the consumer’s
>> config is like this，fetch.min.bytes is set to 1, fetch.wait.max.ms is set
>> to 100.
>> to avoid the inconformity bewteen two machines，I start producer
>> and consumer at the same machine，the machine’s configurations have enough
>> resources to satisfy these two clients.
>>
>> I start consumer before producer on each test，with the sending
>> timestamp in each message，when consumer receive the message，then I can got
>> the consumer delay through the substraction between current timesstamp and
>> sending timestamp.
>> when I set acks to 0，replica to 2，then the average producer delay
>> is 2.98ms， the average consumer delay is 52.23ms.
>> when I set acks to 1，replica to 2，then the average producer delay
>> is 3.9ms，the average consumer delay is 44.88ms.
>> when I set acks to -1, replica to 2, then the average producer
>> delay is 1782ms, the average consumer delay is 1786ms.
>>
>> I have two doubts，the first is why my consumer's delay with acks
>> settled to 0 is logger than the consumer delay witch acks settled to 1.
>> the second is why the delay of producer and consumer is so big when I set
>> acks to -1，I think this delay is can not be accepted.
>> and I found this delay is amplified with sending more messages.
>>
>> any feedback is appreciated.
>> thanks
>>
>>
>>
>>
