boyuanzz commented on a change in pull request #11749:
URL: https://github.com/apache/beam/pull/11749#discussion_r467317077
##########
File path:
sdks/java/io/kafka/src/main/java/org/apache/beam/sdk/io/kafka/KafkaIO.java
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@@ -1306,112 +1315,206 @@ public void populateDisplayData(DisplayData.Builder
builder) {
return
toBuilder().setValueDeserializerProvider(deserializerProvider).build();
}
+ /**
+ * Sets a Kafka {@link Deserializer} to interpret key bytes read from
Kafka.
+ *
+ * <p>In addition, Beam also needs a {@link Coder} to serialize and
deserialize key objects at
+ * runtime. KafkaIO tries to infer a coder for the key based on the {@link
Deserializer} class,
+ * however in case that fails, you can use {@link
#withKeyDeserializerAndCoder(Class, Coder)} to
+ * provide the key coder explicitly.
+ */
public ReadSourceDescriptors<K, V> withKeyDeserializer(
Class<? extends Deserializer<K>> keyDeserializer) {
return
withKeyDeserializerProvider(LocalDeserializerProvider.of(keyDeserializer));
}
+ /**
+ * Sets a Kafka {@link Deserializer} for interpreting key bytes read from
Kafka along with a
Review comment:
Done, thanks!
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