yyfhust commented on code in PR #34505:
URL: https://github.com/apache/beam/pull/34505#discussion_r2025256262
##########
sdks/java/io/kafka/src/main/java/org/apache/beam/sdk/io/kafka/KafkaIO.java:
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@@ -1784,8 +1784,10 @@ public PCollection<KafkaRecord<K, V>> expand(PBegin
input) {
.withConsumerConfigOverrides(kafkaRead.getConsumerConfig())
.withOffsetConsumerConfigOverrides(kafkaRead.getOffsetConsumerConfig())
.withConsumerFactoryFn(kafkaRead.getConsumerFactoryFn())
-
.withKeyDeserializerProvider(kafkaRead.getKeyDeserializerProvider())
-
.withValueDeserializerProvider(kafkaRead.getValueDeserializerProvider())
+ .withKeyDeserializerProviderAndCoder(
+ kafkaRead.getKeyDeserializerProvider(), keyCoder)
+ .withValueDeserializerProviderAndCoder(
+ kafkaRead.getValueDeserializerProvider(), valueCoder)
Review Comment:
this is at the entry of kafka IO, and it will 100% return a coder :
https://github.com/apache/beam/blob/800d434e862c3ea48c74a38a6ab96387ed06fbf1/sdks/java/io/kafka/src/main/java/org/apache/beam/sdk/io/kafka/KafkaIO.java#L1940-L1943
if coder is given, it will return the coder specified by user. If not, it
will attempt to retrieve a coder from registry , which only has coder for
build-in deserializer.
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