Kafka specifies partition and offset consumption. Kafka specifies partition and offset consumption.

Kafka specifies partition and offset consumption.

December 25, 2017 17:28:50

Number of readings: 282

consumer:

public class DConsumer {

    public static void main(String[] args) {
        Properties prop = new Properties();
        prop.put("bootstrap.servers","node:9092");
        prop.put("group.id","test8");
        prop.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        prop.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
//如果是之前存在的group.id
        Consumer consumer = new KafkaConsumer(prop);
        TopicPartition p = new TopicPartition( "test2" , 2 ) ;
 //         Specify the partition that consumes the
 topic consumer.assign( Arrays.asList (p)) ;
 //         Specify to start consumption
 from an offset of the topic 's partition // consumer.seekToBeginning(Arrays. asList(p));
 consumer.seek(p , 5 ) ;
 // consumer.subscribe(Arrays.asList("test2"));
 //if it is a group.id that didn't exist before
 // Map<TopicPartition, OffsetAndMetadata> hashMaps = new HashMap<TopicPartition, OffsetAndMetadata>();
 // hashMaps.put(new TopicPartition("test2", 0), new OffsetAndMetadata(0));
                
//        consumer.commitSync(hashMaps);
//        consumer.subscribe(Arrays.asList("test2"));
while (true) {        
            ConsumerRecords<String, String> c = consumer.poll(100);
            for(ConsumerRecord<String, String> c1: c) {
                System.out.println("Key: " + c1.key() + " Value: " + c1.value() + " Offset: " + c1.offset() + " Partitions: " + c1.partition());
}
            
        }
    }
}