John Roesler created KAFKA-9058:
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Summary: 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
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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