[jira] [Created] (KAFKA-10847) Avoid spurious left/outer join results in stream-stream join

["Matthias J. Sax (Jira)" <ji...@apache.org>]

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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