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https://issues.apache.org/jira/browse/KAFKA-9964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17744947#comment-17744947
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zhangzhisheng commented on KAFKA-9964:
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it's bug, pls follow RoundRobinPartitioner broken by KIP-480
> 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: 2.4.0, 2.5.0, 2.4.1
> Reporter: Michael Bingham
> Priority: Minor
>
> 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 withÂ
> [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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