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Posted to dev@kafka.apache.org by "Artur (Jira)" <ji...@apache.org> on 2020/03/20 14:46:00 UTC

[jira] [Created] (KAFKA-9739) StreamsBuilder.build fails with StreamsException "Found a null keyChangingChild node for OptimizableRepartitionNode"

Artur created KAFKA-9739:
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             Summary: StreamsBuilder.build fails with StreamsException "Found a null keyChangingChild node for OptimizableRepartitionNode"
                 Key: KAFKA-9739
                 URL: https://issues.apache.org/jira/browse/KAFKA-9739
             Project: Kafka
          Issue Type: Bug
          Components: streams
    Affects Versions: 2.4.1
            Reporter: Artur
         Attachments: streams-exception-log.txt, topology-description.txt

We created a topology using Streams DSL (topology description is available in the attached topology-description.txt, no optimization).

Topology works fine with {{topology.optimization=none}}, however it fails to build with StreamsException "Found a null keyChangingChild node for OptimizableRepartitionNode" if we set {{topology.optimization=all}} (exception stack trace is attached streams-exception-log.txt).

We used [https://zz85.github.io/kafka-streams-viz/] to visualize topology and try to guess what might be upsetting optimizer, yet did not manage to figure it out ourselves.



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