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  1. Kafka
  2. KAFKA-10277

Relax non-null key requirement for KStream-GlobalKTable joins

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    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 2.7.0
    • Component/s: streams
    • Labels:

      Description

      In general, Kafka Streams requires that key and value are non-null for aggregations and join input records. While this requirement is reasonable in general, for KStream-GlobalKTable joins it's questionable for the stream input record key. The join is based on a `keySelector` and it seems to be sufficient to require that the `keySelector` returns a not-null join-key for the stream record.

      We should consider to relax the non-null key requirement for stream-side input records.

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            • Assignee:
              JoelWee Joel Wee
              Reporter:
              mjsax Matthias J. Sax

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