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https://issues.apache.org/jira/browse/KAFKA-9058?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax resolved KAFKA-9058.
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Fix Version/s: 2.4.0
Resolution: Fixed
> Foreign Key Join should not require a queriable store
> -----------------------------------------------------
>
> Key: KAFKA-9058
> URL: https://issues.apache.org/jira/browse/KAFKA-9058
> Project: Kafka
> Issue Type: Improvement
> Affects Versions: 2.4.0
> Reporter: John Roesler
> Assignee: John Roesler
> Priority: Blocker
> Labels: streams
> Fix For: 2.4.0
>
>
> While resolving KAFKA-9000, I uncovered a significant flaw in the
> implementation of foreign key joins. The join only works if supplied with a
> queriable store. I think this was simply an oversight during implementation
> and review.
> It would be better to fix this now before the release, since the restriction
> it places on users could represent a significant burden. If they don't
> otherwise need the store to be queriable, then they shouldn't be forced to
> allocate enough storage for a full copy of the join result, or add the
> changelog topic for it either.
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