Kafka Java实现分布式事务

1.在Kafka中支持事务：Kafka实现了分布式事务，其基本原理是在每个分区中使用一个消息标识符来标识一组相关消息，这些消息在同一分区中必须以相同的顺序执行。

2.Kafka Java实现分布式事务：

步骤1：创建KafkaProducer：

Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("transactional.id", "my-transactional-id");
KafkaProducer<String, String> producer = new KafkaProducer<>(props, new StringSerializer(), new StringSerializer());

步骤2：调用KafkaProducer的initTransactions()方法来初始化事务：
producer.initTransactions();

步骤3：发送消息：
producer.beginTransaction();
try {
// Send messages
producer.send(new ProducerRecord<>("topic1", "key1", "value1"));
producer.send(new ProducerRecord<>("topic2", "key2", "value2"));
producer.commitTransaction();
} catch (ProducerFencedException | OutOfOrderSequenceException | AuthorizationException e) {
// We can't recover from these exceptions, so our only option is to close the producer and exit.
producer.close();
} catch (KafkaException e) {
// For all other exceptions, just abort the transaction and try again.
producer.abortTransaction();
}
步骤4：关闭KafkaProducer：
producer.close();