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https://issues.apache.org/jira/browse/BEAM-12008?focusedWorklogId=620188&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-620188
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ASF GitHub Bot logged work on BEAM-12008:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 07/Jul/21 19:54
Start Date: 07/Jul/21 19:54
Worklog Time Spent: 10m
Work Description: chamikaramj commented on a change in pull request
#15090:
URL: https://github.com/apache/beam/pull/15090#discussion_r665664496
##########
File path:
sdks/java/io/kafka/src/main/java/org/apache/beam/sdk/io/kafka/KafkaIO.java
##########
@@ -838,6 +850,16 @@ public void setTimestampPolicy(String timestampPolicy) {
}
}
+ /**
+ * Sets nullKeyFlag for present of null keys
+ *
+ * <p>By default, nullKeyFlag is {@code false} and will invoke {@link
KafkaRecordCoder} when
+ * nullKeyFlag is {@code true}, it invokes {@link
NullableKeyKafkaRecordCoder}
+ */
+ public Read<K, V> withNullKeyFlag() {
Review comment:
Makes sense. Probably consider renaming this to something like
"withSupportsNullKeys()" and update documentation to describe usability instead
of implementation details.
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Issue Time Tracking
-------------------
Worklog Id: (was: 620188)
Time Spent: 3h 20m (was: 3h 10m)
> 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
> Assignee: Weiwen Xu
> Priority: P2
> Labels: stale-P2
> Time Spent: 3h 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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