Matthias J. Sax created KAFKA-10847:
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Summary: Avoid spurious left/outer join results in stream-stream
join
Key: KAFKA-10847
URL: https://issues.apache.org/jira/browse/KAFKA-10847
Project: Kafka
Issue Type: Improvement
Components: streams
Reporter: Matthias J. Sax
KafkaStreams follows an eager execution model, ie, it never buffers input
records but processes them right away. For left/outer stream-stream join, this
implies that left/outer join result might be emitted before the window end (or
window close) time is reached. Thus, a record what will be an inner-join
result, might produce a eager (and spurious) left/outer join result.
We should change the implementation of the join, to not emit eager left/outer
join result, but instead delay the emission of such result after the window
grace period passed.
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