KIP-775 — Custom partitioners in foreign key joins

Accepted Kafka 3.1 Streams

Enables Kafka Streams foreign-key (FK) table joins to work correctly when the primary or foreign-key tables use custom partitioners by making the subscription and response topics copartition with the relevant tables. Previously FK joins silently produced missing results if either table was partitioned with a non-default partitioner, because lookups could be routed to Streams instances that did not hold the required state.

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