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https://issues.apache.org/jira/browse/BEAM-12008?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Beam JIRA Bot reassigned BEAM-12008:
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Assignee: (was: Weiwen Xu)
> KafkaIO does not handle null keys
> ---------------------------------
>
> Key: BEAM-12008
> URL: https://issues.apache.org/jira/browse/BEAM-12008
> Project: Beam
> Issue Type: Bug
> Components: io-java-kafka
> Reporter: Daniel Collins
> Priority: P2
> Labels: stale-P2, stale-assigned
> Time Spent: 9h 20m
> Remaining Estimate: 0h
>
> Kafka
> [ConsumerRecord|https://kafka.apache.org/27/javadoc/org/apache/kafka/clients/consumer/ConsumerRecord.html#key--]
> and
> [ProducerRecord|https://kafka.apache.org/27/javadoc/org/apache/kafka/clients/producer/ProducerRecord.html#key--]
> 'key' fields are explicitly allowed to be null. In addition, on the producer
> side, setting a null key is the way that the user indicates that they want a
> [random partition for their
> message|[https://github.com/apache/kafka/blob/9adfac280392da0837cfd8d582bc540951e94087/clients/src/main/java/org/apache/kafka/clients/producer/internals/DefaultPartitioner.java#L67].]
>
> Beam KafkaIO does not support null keys in byte[] mode (read side:
> [https://github.com/apache/beam/blob/9e0997760cf3320f1a1d0c4342d3dff559a25775/sdks/java/io/kafka/src/main/java/org/apache/beam/sdk/io/kafka/KafkaIO.java#L727|https://github.com/apache/beam/blob/9e0997760cf3320f1a1d0c4342d3dff559a25775/sdks/java/io/kafka/src/main/java/org/apache/beam/sdk/io/kafka/KafkaIO.java#L727)]
> write side:
> [https://github.com/apache/beam/blob/9e0997760cf3320f1a1d0c4342d3dff559a25775/sdks/java/io/kafka/src/main/java/org/apache/beam/sdk/io/kafka/KafkaRecordCoder.java#L58])
>
> since it would defer to ByteArrayCoder which does not support null arrays.
>
> BeamKafkaTable suffers the same issue
> https://github.com/apache/beam/blob/9e0997760cf3320f1a1d0c4342d3dff559a25775/sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/meta/provider/kafka/BeamKafkaTable.java#L144
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