Damien Gasparina created KAFKA-13024:
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Summary: Kafka Streams is dropping messages with null key during
repartition
Key: KAFKA-13024
URL: https://issues.apache.org/jira/browse/KAFKA-13024
Project: Kafka
Issue Type: Bug
Components: streams
Affects Versions: 2.7.1, 2.8.0
Reporter: Damien Gasparina
{{KStream.repartition}} is silently filtering messages with null keys. A single
topology like {{.stream().repartition().to()}} would filter all messages with
null key.
We are adding a filtering before the repartition
([https://github.com/apache/kafka/blob/2.8/streams/src/main/java/org/apache/kafka/streams/kstream/internals/KStreamImpl.java#L1060-L1064]).
It looks like we are doing that because this method is also used for building
KTable.
Null key messages are valid for a KStream, it looks like a regression, the
previous {{.through()}} was not filtering null key messages.
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