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From "Ivan Babrou (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-6441) FetchRequest populates buffer of size MinBytes, even if response is smaller
Date Thu, 11 Jan 2018 05:10:00 GMT
Ivan Babrou created KAFKA-6441:
----------------------------------

             Summary: FetchRequest populates buffer of size MinBytes, even if response is
smaller
                 Key: KAFKA-6441
                 URL: https://issues.apache.org/jira/browse/KAFKA-6441
             Project: Kafka
          Issue Type: Bug
    Affects Versions: 0.11.0.1
            Reporter: Ivan Babrou


We're using Sarama Go client as consumer, but I don't think it's relevant. Producer is syslog-ng
with Kafka output, I'm not quite sure which log format Kafka itself is using, but I can assume
0.11.0.0, because that's what is set in topic settings.

Our FetchRequest has minSize = 16MB, maxSize = 64, maxWait = 500ms. For a silly reason, Kafka
decides to reply with at least minSize buffer with just one 1KB log message. When Sarama was
using older consumer API, everything was okay. When we upgraded to 0.11.0.0 consumer API,
consumer traffic for 125Mbit/s topic spiked to 55000Mbit/s on the wire and consumer wasn't
even able to keep up.

1KB message in a 16MB buffer is 1,600,000% overhead.

I don't think there's any valid reason to do this.

It's also mildly annoying that there is no tag 0.11.0.1 in git, looking at changes is harder
than it should be.



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