johnjcasey commented on code in PR #24964:
URL: https://github.com/apache/beam/pull/24964#discussion_r1066290860
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sdks/java/io/kafka/src/main/java/org/apache/beam/sdk/io/kafka/KafkaWriter.java:
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@@ -42,13 +42,16 @@
*/
class KafkaWriter<K, V> extends DoFn<ProducerRecord<K, V>, Void> {
+ protected transient @Nullable Callback callback;
Review Comment:
what is the motivation for a single callback?
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