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KafkaConsumer consumer = new KafkaConsumer<>(consumerConfig); // Recommend a smaller txn timeout, for example 10 seconds. producerConfig.put(ProducerConfig.TRANSACTION_TIMEOUT_CONFIG, 10000); KafkaProducer producer = new KafkaProducer(producerConfig); producer.initTransactions(); while (true) { // Read some records from the consumer and collect the offsets to commit ConsumerRecords consumed = consumer.poll(Duration.ofMillis(5000)); // This will be the fencing point if there are pending offsets for the first time. 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); // Pass the entire consumer group metadata producer.sendOffsetsToTransaction(consumedOffsets, consumer.groupMetadata()); producer.commitTransaction(); } |
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