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https://issues.apache.org/jira/browse/KAFKA-9335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17039049#comment-17039049
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Vijay Veeramani commented on KAFKA-9335:
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[~bchen225242] thanks for looking into this... Is there any work around for 
this defect, till 2.4.1 release becomes available? 

> 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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