Niels van Kaam created FLINK-14034:
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Summary: In FlinkKafkaProducer, KafkaTransactionState should be made public or invoke should be made final
Key: FLINK-14034
URL:
https://issues.apache.org/jira/browse/FLINK-14034 Project: Flink
Issue Type: Wish
Components: Connectors / Kafka
Affects Versions: 1.9.0
Reporter: Niels van Kaam
It is not possible to override the invoke method of the FlinkKafkaProducer, because the first parameter, KafkaTransactionState, is a private inner class. It is not possible to override the original invoke of SinkFunction, because TwoPhaseCommitSinkFunction (which is implemented by FlinkKafkaProducer) does override the original invoke method with final.
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https://github.com/apache/flink/blob/master/flink-connectors/flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaProducer.java]
If there is a particular reason for this, I think it would be better to make the invoke method in FlinkKafkaProducer final as well, and document the reason such that it is clear this is by design (I don't see any overrides in the same package).
Otherwise, I would make the KafkaTransactionState publicly visible. I would like to override the Invoke method to create a custom KafkaProducer which performs some additional generic validations and transformations. (which can also be done in a process-function, but a custom sink would simplify the code of jobs)
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