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https://issues.apache.org/jira/browse/BEAM-13924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Beam JIRA Bot updated BEAM-13924:
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Labels: bug kafka (was: bug kafka stale-P2)
> Coder information lost in Kafka Read
> ------------------------------------
>
> Key: BEAM-13924
> URL: https://issues.apache.org/jira/browse/BEAM-13924
> Project: Beam
> Issue Type: Bug
> Components: io-java-kafka
> Affects Versions: 2.36.0
> Reporter: Jonas Grabber
> Priority: P3
> Labels: bug, kafka
>
> When upgrading from 2.29.0 to 2.36.0 our Kafka Read transform broke.
> While debugging, I saw that information of the key and value coders is lost
> after [this statement in
> KafkaIO|https://github.com/apache/beam/blob/v2.36.0/sdks/java/io/kafka/src/main/java/org/apache/beam/sdk/io/kafka/KafkaIO.java#L1459]:
> {code:java}
> return output.apply(readTransform).setCoder(KafkaRecordCoder.of(keyCoder,
> valueCoder));
> {code}
> The issue seems to be that {{output.apply}} already checks for the presence
> of key and value coders and ends up trying to infer them with the help of
> [LocalDeserializerProvider|https://github.com/apache/beam/blob/v2.36.0/sdks/java/io/kafka/src/main/java/org/apache/beam/sdk/io/kafka/LocalDeserializerProvider.java],
> so the process never arrives at {{{}setCoder{}}}.
> In our case this inference fails since we implement the {{Deserializer}}
> interface in a super class of the instance passed as the deserializer (I
> assume it would also fail afterwards since we don't register our coders with
> the registry).
> This was not yet broken on 2.29.0, so all versions after that could be
> affected.
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