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https://issues.apache.org/jira/browse/KAFKA-9335?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guozhang Wang resolved KAFKA-9335.
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Resolution: Fixed
> java.lang.IllegalArgumentException: Number of partitions must be at least 1.
> ----------------------------------------------------------------------------
>
> Key: KAFKA-9335
> URL: https://issues.apache.org/jira/browse/KAFKA-9335
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 2.4.0
> Reporter: Nitay Kufert
> Assignee: Boyang Chen
> Priority: Blocker
> Labels: bug
> Fix For: 2.4.1
>
>
> Hey,
> When trying to upgrade our Kafka streams client to 2.4.0 (from 2.3.1) we
> encountered the following exception:
> {code:java}
> java.lang.IllegalArgumentException: Number of partitions must be at least 1.
> {code}
> It's important to notice that the exact same code works just fine at 2.3.1.
>
> I have created a "toy" example which reproduces this exception:
> [https://gist.github.com/nitayk/50da33b7bcce19ad0a7f8244d309cb8f]
> and I would love to get some insight regarding why its happening / ways to
> get around it
>
> Thanks
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