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Posted to jira@kafka.apache.org by "Michael Bingham (Jira)" <ji...@apache.org> on 2020/05/06 22:41:00 UTC

[jira] [Created] (KAFKA-9964) Better description of RoundRobinPartitioner behavior for AK 2.4+

Michael Bingham created KAFKA-9964:
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             Summary: Better description of RoundRobinPartitioner behavior for AK 2.4+
                 Key: KAFKA-9964
                 URL: https://issues.apache.org/jira/browse/KAFKA-9964
             Project: Kafka
          Issue Type: Improvement
          Components: producer 
    Affects Versions: 2.4.1, 2.5.0, 2.4.0
            Reporter: Michael Bingham


The Javadocs for {{RoundRobinPartitioner}} currently state:
{quote}This partitioning strategy can be used when user wants to distribute the writes to all partitions equally
{quote}
In AK 2.4+, equal distribution is not guaranteed, even with this partitioner. The enhancements to consider batching made with [https://cwiki.apache.org/confluence/display/KAFKA/KIP-480%3A+Sticky+Partitioner] affect this partitioner as well.


So it would be useful to add some additional Javadocs to explain that unless batching is disabled, even distribution of records is not guaranteed.



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