Kafka事件即使没有重试机制，仍在进行重试

这可能是由于生产者配置中设置了默认的重试次数导致的。要解决这个问题，可以在生产者配置文件中将重试次数设置为0，或者在发送消息时明确指定重试次数为0。

以下是在发送消息时指定重试次数为0的示例：

Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("acks", "all");
props.put("retries", 0); //设置重试次数为0
props.put("batch.size", 16384);
props.put("linger.ms", 1);
props.put("buffer.memory", 33554432);
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");

Producer<String, String> producer = new KafkaProducer<>(props);
ProducerRecord<String, String> record = new ProducerRecord<>("my_topic", "key", "value");
producer.send(record, new Callback() {
    @Override
    public void onCompletion(RecordMetadata metadata, Exception exception) {
        if (exception != null) {
            System.err.println("Error producing message: " + exception);
        } else {
            System.out.printf("Message sent to topic %s at position %d%n", metadata.topic(), metadata.offset());
        }
    }
});
producer.close();