fx19880617 opened a new issue #6480:
URL: https://github.com/apache/incubator-pinot/issues/6480
Seeing more requirements on this.
Kafka consumer supports exact-once semantics but requires code changes.
Code snippet:
```
KafkaConsumer consumer = createKafkaConsumer(
"bootstrap.servers", "localhost:9092",
"group.id", "my-group-id",
"isolation.level", "read_committed");
consumer.subscribe(singleton("inputTopic"));
while (true) {
ConsumerRecords records = consumer.poll(Long.MAX_VALUE);
producer.beginTransaction();
for (ConsumerRecord record : records)
producer.send(producerRecord("outputTopic", record));
producer.sendOffsetsToTransaction(currentOffsets(consumer), group);
producer.commitTransaction();
}
```
We can add a config in kafka-2.0 plugin and switch the code path.
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