End-of-window outer join with KafkaStreams

Question

I have a Kafka topic where I expect messages with two different key types: old and new. i.e. \"1-new\", \"1-old\", \"2-new\", \"

Answer 1

Looks like what you were looking for. Kafka Streams left outer join on timeout

Eliminates the lack of sql-like left join semantic in kafka streams framework. This implementation will generate left join event only if full join event didn't happen in join window duration interval.