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String groupIdconsumerGroupId = "group"; Set<String> topics = buildSubscription(); KafkaConsumer consumer = new KafkaConsumer(buildConsumerConfig(groupId)); KafkaProducer producer = new KafkaProducer(buildProducerConfig()); consumer.subscribe(topics, new ConsumerRebalanceListener() { void onPartitionsAssigned(Collection<TopicPartition> partitions, int generationId) { // On assignment, call initTransactions() in order to ensure any // transactions involving committed offsets from the assigned partitions // have been completed producer.initTransactions(new TxnProducerIdentity(partitions, consumerGroupId, generationId)); } }); while (true) { // Read some records from the consumer and collect the offsets to commit ConsumerRecords consumed = consumer.poll(Duration.ofMillis(5000)); Map<TopicPartition, OffsetAndMetadata> consumedOffsets = offsets(consumed); // Do some processing and build the records we want to produce List<ProducerRecord> processed = process(consumed); // Write the records and commit offsets under a single transaction producer.beginTransaction(); for (ProducerRecord record : processed) producer.send(record); producer.sendOffsetsToTransaction(consumedOffsets, groupId); producer.commitTransaction(); } |
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