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  1. Kafka
  2. KAFKA-10847

Avoid spurious left/outer join results in stream-stream join

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    • Improvement
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • None
    • 3.1.0
    • streams
    • None

    Description

      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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              spena Sergio Peña
              mjsax Matthias J. Sax
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                Updated:
                Resolved: