服务器不接受Kafka消息(仅从远程IP?)

时间:2018-08-21 10:20:32

标签: apache-kafka kafka-producer-api

如果我从C ++应用程序或从本地计算机通过命令行生成和使用,我的Kafka服务器可以正常工作。

但是从外部IP地址无法正常工作:创建了该主题,我看到了使用带有ACK的 tcpdump 的网络流量(表示kafka正在应答),但是队列上没有消息,而java没有给出错误。在日志上找不到任何内容。或谷歌。这是我的应用程序:

public class KafkaPBJProducer {
    private static String KAFKA_TOPIC = "test";

    public static void main(String[] args) {
        Properties properties = new Properties();
        properties.put("bootstrap.servers", "192.168.1.131:9092");
        properties.put("acks", "all");
        properties.put("retries", 0);
        properties.put("batch.size", 16384);
        properties.put("linger.ms", 1);
        properties.put("buffer.memory", 33554432);
        properties.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
        properties.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");

        properties.put("kafka.topic", KAFKA_TOPIC);
        runMainLoop(properties);
    }

    static void runMainLoop(Properties properties) {
        @SuppressWarnings("resource")
        KafkaProducer<String, String> producer = new KafkaProducer<String, String>(properties);
        for (int count = 0; count < 10; count++) {
            String msg = getMsg(String.valueOf(count));
            System.out.println("Producing message: " + msg);
            producer.send(new ProducerRecord<String, String>(KAFKA_TOPIC, 0, "dev-" + count, msg));
            producer.flush();
        }
    }

    public static String getMsg(String id) {
        JsonObject obj = new JsonObject();
        try {
            obj.addProperty("id", id);
            obj.addProperty("timestamp", new Timestamp(System.currentTimeMillis()).toString());
            obj.addProperty("data", Base64.getEncoder().encodeToString("Hello, World!".getBytes("utf-8")));
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return new Gson().toJson(obj);
    }
}

运行时,每条消息都会像一分钟那样卡住(不显示任何错误,发送它们仅花费大量时间):

Producing message: {"id":"0","timestamp":"2018-08-21 13:49:10.697","data":"SGVsbG8sIFdvcmxkIQ\u003d\u003d"}
Producing message: {"id":"1","timestamp":"2018-08-21 13:50:10.794","data":"SGVsbG8sIFdvcmxkIQ\u003d\u003d"}
Producing message: {"id":"2","timestamp":"2018-08-21 13:51:10.797","data":"SGVsbG8sIFdvcmxkIQ\u003d\u003d"}
Producing message: {"id":"3","timestamp":"2018-08-21 13:52:10.813","data":"SGVsbG8sIFdvcmxkIQ\u003d\u003d"}

我可以看到该主题已创建:

> bin/kafka-topics.sh --list --zookeeper localhost:2181
__consumer_offsets
test

我可以使用命令行将内容手动添加到主题:

$ bin/kafka-console-producer.sh --broker-list localhost:9092 --topic test
>one
>two
>four

但是,如果我选中该主题,则只会列出手动发送的消息:

$ bin/kafka-console-consumer.sh --bootstrap-server 192.168.1.131:9092 --topic test --from-beginning
one
two
four

(after several minutes, I press CTRL-C)
^CProcessed a total of 3 messages

这是怎么回事?为什么创建主题但服务器上不接受消息? kafka为什么不报告任何错误?

TIA!

1 个答案:

答案 0 :(得分:2)

找到了。基于Kafka - Unable to send a message to a remote server using Java,问题出在配置文件 conf / servers.properties 上;它需要取消注释此行:

advertised.listeners=PLAINTEXT://192.168.1.131:9092

还是谢谢。