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https://issues.apache.org/jira/browse/KAFKA-7912?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sophie Blee-Goldman reopened KAFKA-7912:
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The fix for this caused a performance regression and is being rolled back. We 
should look into alternative ways to support concurrent modifications to the 
underlying data structure

> In-memory key-value store does not support concurrent access 
> -------------------------------------------------------------
>
>                 Key: KAFKA-7912
>                 URL: https://issues.apache.org/jira/browse/KAFKA-7912
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>            Reporter: Sophie Blee-Goldman
>            Assignee: Sophie Blee-Goldman
>            Priority: Major
>             Fix For: 2.3.0
>
>
> Currently, the in-memory key-value store uses a Map to store key-value pairs 
> and fetches them by calling subMap and returning an iterator to this submap. 
> This is unsafe as the submap is just a view of the original map and there is 
> risk of concurrent access.



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