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Posted to dev@kafka.apache.org by "John Roesler (Jira)" <ji...@apache.org> on 2020/02/03 21:26:33 UTC

[jira] [Created] (KAFKA-9500) Foreign-Key Join creates an invalid topology

John Roesler created KAFKA-9500:
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             Summary: Foreign-Key Join creates an invalid topology
                 Key: KAFKA-9500
                 URL: https://issues.apache.org/jira/browse/KAFKA-9500
             Project: Kafka
          Issue Type: Bug
    Affects Versions: 2.4.0, 2.5.0, 2.4.1
            Reporter: John Roesler
            Assignee: John Roesler


Foreign-Key Join results are not required to be materialized by default, but they might be needed if downstream operators need to perform lookups on the result (such as when the join result participates in an equi-join).

Currently, if the result is explicitly materialized (via Materialized), this works correctly, but if the result is _not_ materialized explicitly, but _is_ needed, the topology builder throws an exception that the result store isn't added to the topology. This was an oversight in testing and review and needs to be fixed ASAP.



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