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  1. Apache Kafka provides a robust set of APIs to enable developers to build, manage, and integrate streaming applications. These APIs facilitate producing, consuming, and processing streams of data, as well as managing Kafka clusters programmatically. Below are the key Kafka APIs and their functionalities:

    Producer API

    The Producer API allows applications to publish streams of events to Kafka topics. It supports configurations like acknowledgments, compression, and batching to optimize performance. Here's an example of a simple producer:

    Properties props = new Properties();
    props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "<HOST>:9092");
    props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
    props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class);

    try (Producer<String, String> producer = new KafkaProducer<>(props)) {
    producer.send(new ProducerRecord<>("my-topic", "some-message"), (metadata, exception) -> {
    if (exception != null) {
    System.err.println("Error producing message: " + exception);
    } else {
    System.out.printf("Message sent to topic %s at offset %d%n", metadata.topic(), metadata.offset());
    }
    });
    }
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