Kafka生产者自动故障转移/故障恢复

Kafka生产者（producer）的故障转移/故障恢复是指当主生产者出现问题时，系统会自动切换到备用生产者。这个过程需要依靠Zookeeper来完成。下面是一个基于Java语言的Kafka生产者自动故障转移/故障恢复示例：

首先，在pom.xml文件中添加以下依赖：

<dependency>
    <groupId>org.apache.kafka</groupId>
    <artifactId>kafka-clients</artifactId>
    <version>2.4.0</version>
</dependency>
<dependency>
    <groupId>org.apache.curator</groupId>
    <artifactId>curator-framework</artifactId>
    <version>2.12.0</version>
</dependency>

然后，编写KafkaProducer实现类：

import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.common.serialization.StringSerializer;
import org.apache.kafka.clients.producer.ProducerRecord;

import java.util.Properties;

public class MyProducer {

    private static final String zookeeperConnect = "localhost:2181";
    private static final String kafkaBrokerList = "localhost:9092,localhost:9093,localhost:9094";

    private final Properties props;

    public MyProducer() {
        props = new Properties();
        props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, kafkaBrokerList);
        props.put(ProducerConfig.ACKS_CONFIG, "all");
        props.put(ProducerConfig.RETRIES_CONFIG, 0);
        props.put(ProducerConfig.BATCH_SIZE_CONFIG, 16384);
        props.put(ProducerConfig.LINGER_MS_CONFIG, 1);
        props.put(ProducerConfig.BUFFER_MEMORY_CONFIG, 33554432);
        props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
        props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
        props.put(ProducerConfig.MAX_IN_FLIGHT_REQUEST