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https://issues.apache.org/jira/browse/BEAM-6063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16687068#comment-16687068
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Alexey Romanenko commented on BEAM-6063:
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Agree, the second option should be better for users.
> KafkaIO: add writing support for ProducerRecord
> -----------------------------------------------
>
> Key: BEAM-6063
> URL: https://issues.apache.org/jira/browse/BEAM-6063
> Project: Beam
> Issue Type: Improvement
> Components: io-java-kafka
> Reporter: Alexey Romanenko
> Assignee: Alexey Romanenko
> Priority: Major
>
> Currently, the default input collection for {{KafkaIO.Write}} is
> {{PCollection<KV<K,V>>}}. To support writing of Kafka headers or different
> output Kafka topics, we need to change type of input collection to
> {{PCollection<ProducerRecord<K,V>>}}. Also, it will make sense to use
> {{ProducerRecord<K,V>}} instead of {{KV<K,V>}} internally in {{KafkaIO}} to
> keep all meta information.
> In the same time, we need to keep compatibility for old interface based on
> {{KV<K,V>}} but make it deprecated and totally move to
> {{ProducerRecord<K,V>}} later.
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