Question

我今天才开始使用Kafka 2.1.0，正在探索生产者API。我有以下代码：

public class KafkaCheck {

    public static void main(String[] args) throws Exception {
        final Map<String, Object> cfg = new HashMap<>();
        cfg.put("bootstrap.servers", "localhost:9092");
        cfg.put("acks", "all");
        cfg.put("enable.idempotence", true);
        cfg.put("delivery.timeout.ms", 30000);
        final KafkaProducer<String, String> client = new KafkaProducer<>(
                cfg, new StringSerializer(), new StringSerializer());
        try {
            System.out.println("making call");
            client.partitionsFor("veryimportanttopicindeed");
        } catch (KafkaException e) {
            System.out.println("closing");
            client.close(0, TimeUnit.MILLISECONDS);
            throw new RuntimeException("Well this is FUBAR");
        }
    }
}

当Kafka不在运行时，partitionsFor调用会阻塞60秒钟，但随后close调用会永远停止：

making call
2018-12-13 15:27:27,955 WARN o.a.k.c.NetworkClient [Producer clientId=producer-1]
Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker
may not be available.
***snip***
closing
2018-12-13 15:28:28,683 WARN o.a.k.c.NetworkClient [Producer clientId=producer-1]
Connection to node -1 (localhost/127.0.0.1:9092) could not be established. 
Broker may not be available.
***snip***
2018-12-13 15:32:52,667 WARN o.a.k.c.NetworkClient [Producer clientId=producer-1]
Connection to node -1 (localhost/127.0.0.1:9092) could not be established. 
Broker may not be available.

我在producer configs中看不到任何可能影响此内容的内容。如何关闭客户？

KafkaProducer.client.close（0，TimeUnit.MILLISECONDS）似乎永远阻塞

0 个答案: