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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