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ConsumerAPI.md

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Consumer API

  • Using Consumer API, a consumer can subscribe (poll at the given interval) to one or more topics in the Kafka.
        Properties props = new Properties();
        props.setProperty("bootstrap.servers", "localhost:9092");
        props.setProperty("group.id", "test");
        props.setProperty("enable.auto.commit", "true");
        props.setProperty("auto.commit.interval.ms", "1000");
        props.setProperty("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        props.setProperty("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
        
        consumer.subscribe(Arrays.asList("foo-topic", "bar-topic"));
        
        while (true) {
            
            ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(100));
            
            for (ConsumerRecord<String, String> record : records)
                System.out.printf("offset = %d, key = %s, value = %s%n", record.offset(), record.key(), record.value());
            }
        
        }