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https://issues.apache.org/jira/browse/KAFKA-7912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17108449#comment-17108449
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Sophie Blee-Goldman commented on KAFKA-7912:
--------------------------------------------
I set the fix version to 2.3.0 rather than 2.3.1, as this issue is technically
fixed in 2.3.0. The fix just happened to result in a significant performance
regression so a different fix was applied in 2.3.1
> 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, 2.4.0
>
>
> 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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