Matthias J. Sax created KAFKA-16644: ---------------------------------------
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] -- This message was sent by Atlassian Jira (v8.20.10#820010)