【Java】kafka错误之 Topic xxx not present in metadata after 60000 ms
一、背景
今天尝试使用 kafka 的 生产者 api 写一下,消息发送,结果遇到以下问题,Topic xxx not present in metadata after 60000 ms
,找了半天结果发现是jar包引入不全导致的,为防以后忘记,在此记录一下。
二、场景还原
1、jar包引入
<dependency><groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>2.6.0</version>
</dependency>
2、jar代码
public class KafkaProducerDemo {public static void main(String[] args) {
Properties properties = new Properties();
properties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "127.0.0.1:9092,127.0.0.1:9093,127.0.0.1:9094");
properties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");
properties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");
properties.put(ProducerConfig.ACKS_CONFIG, "all");
properties.put(ProducerConfig.BUFFER_MEMORY_CONFIG, 33554432);
properties.put(ProducerConfig.RETRIES_CONFIG, 0);
properties.put(ProducerConfig.RETRY_BACKOFF_MS_CONFIG, 300);
properties.put(ProducerConfig.BATCH_SIZE_CONFIG, 16384);
// KafkaProducer 是线程安全的,可以多个线程使用用一个 KafkaProducer
KafkaProducer<String, String> kafkaProducer = new KafkaProducer<>(properties);
for (int i = 0; i < 100; i++) {
ProducerRecord<String, String> record = new ProducerRecord<>("topic-a", "value - (" + i + 1 + ")");
kafkaProducer.send(record, new Callback() {
@Override
public void onCompletion(RecordMetadata metadata, Exception exception) {
if (exception != null) {
System.err.println("发送数据到kafka中,发生了异常.");
exception.printStackTrace();
return;
}
System.out.println("topic: " + metadata.topic() + " offset: " + metadata.offset() + " partition: "
+ metadata.partition());
}
});
}
System.out.println("消息发送完成");
kafkaProducer.close();
}
}
3、运行结果
运行上面的代码出现了 org.apache.kafka.common.errors.TimeoutException: Topic topic-a not present in metadata after 60000 ms
异常。
三、问题解决
其实这个问题很简单,在启动项目的时候加入 logback.xml
配置文件,然后加入logback
相关的jar包,发现,缺少jackson
的jar,引入之后就好了。
<dependency><groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>2.6.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.12.0</version>
</dependency>
四、参考文档
1、https://stackoverflow.com/questions/63714401/org-apache-kafka-common-errors-timeoutexception-topic-not-present-in-metadata-a
2、http://kafka.apache.org/26/documentation.html#producerapi
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