Matthias J. Sax created KAFKA-16644:
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Summary: FK join emit duplicate tombstone on left-side delete
Key: KAFKA-16644
URL: https://issues.apache.org/jira/browse/KAFKA-16644
Project: Kafka
Issue Type: Bug
Components: streams
Affects Versions: 3.7.0
Reporter: Matthias J. Sax
We introduced a regression bug in 3.7.0 release via KAFKA-14778. When a
left-hand side record is deleted, the join now emits two tombstone records
instead of one.
The problem was not detected via unit test, because the test use a `Map`
instead of a `List` when verifying the result topic records
([https://github.com/apache/kafka/blob/trunk/streams/src/test/java/org/apache/kafka/streams/integration/KTableKTableForeignKeyJoinIntegrationTest.java#L250-L255).]
We should update all test cases to use `List` when reading from the output
topic, and of course fix the introduces bug: The
`SubscriptionSendProcessorSupplier` is sending two subscription records instead
of just a single one:
[https://github.com/apache/kafka/blob/trunk/streams/src/main/java/org/apache/kafka/streams/kstream/internals/foreignkeyjoin/SubscriptionSendProcessorSupplier.java#L133-L136]
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