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https://issues.apache.org/jira/browse/KAFKA-20030?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chia-Ping Tsai resolved KAFKA-20030.
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Fix Version/s: 4.3.0
Resolution: Fixed
> Document considerations and side effects of dynamic partition expansion
> -----------------------------------------------------------------------
>
> Key: KAFKA-20030
> URL: https://issues.apache.org/jira/browse/KAFKA-20030
> Project: Kafka
> Issue Type: Improvement
> Reporter: Chia-Ping Tsai
> Assignee: Lan Ding
> Priority: Minor
> Fix For: 4.3.0
>
>
> We should update the documentation to list important considerations when
> users dynamically increase the number of partitions for a topic.
> Key points to include:
> *Key Distribution Changes:* The default partitioner’s mapping logic (e.g.,
> hash of the key) changes when the partition count increases, which may affect
> message ordering for existing keys.
> *Potential Data Loss with {{{}latest{}}}:* Existing consumers configured with
> {{auto.offset.reset=latest}} might miss messages produced to the new
> partitions during the window between partition creation and consumer
> discovery.
> *Metadata Propagation Delay:* New partitions are not immediately visible to
> producers and consumers due to metadata refresh intervals.
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