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https://issues.apache.org/jira/browse/KAFKA-14573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18048429#comment-18048429
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Youri commented on KAFKA-14573:
-------------------------------
This duplicates https://issues.apache.org/jira/browse/KAFKA-16283 and no longer
an issue with 4.x.
> RoundRobinPartitioner doesn't work as expected with topic that has 6
> partitions
> -------------------------------------------------------------------------------
>
> Key: KAFKA-14573
> URL: https://issues.apache.org/jira/browse/KAFKA-14573
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 3.3.1
> Reporter: Stephane Maarek
> Priority: Major
> Attachments: image-2023-01-04-20-15-43-039.png
>
>
> Create a topic with 6 partitions (that's how the behavior is observed)
> ```
> kafka-topics.sh --bootstrap-server localhost:9092 --topic test_topic --create
> --partitions 6
> ```
> Start a consumer
> ```
> kafka-console-consumer --bootstrap-server localhost:9092 --topic test_topic
> --formatter kafka.tools.DefaultMessageFormatter --property
> print.timestamp=true --property print.key=true --property print.value=true
> --property print.partition=true --from-beginning
> ```
> Start a producer using `RoundRobinPartitioner`
> ```
> kafka-console-producer.sh --bootstrap-server localhost:9092
> --producer-property
> partitioner.class=org.apache.kafka.clients.producer.RoundRobinPartitioner
> --topic test_topic
> ```
> And you will see only 3 partitions get produced to (not 6)
> This doesn't happen with 3 partitions, 5, 7, 9 partitions (we get the
> expected behavior).
> But with 6.... it happens.
> Verified to be like this on my colleague's computer too.
> ```
> CreateTime: 1672859052082 Partition: 5 null a
> CreateTime: 1672859053586 Partition: 1 null b
> CreateTime: 1672859054995 Partition: 3 null c
> CreateTime: 1672859056405 Partition: 5 null d
> CreateTime: 1672859057861 Partition: 1 null e
> CreateTime: 1672859059181 Partition: 3 null f
> ```
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