kafka producer partitions分区器(七)

Love The Way You Lie 2023-08-17 16:16 65阅读 0赞

消息在经过拦截器、序列化后，就需要确定它发往哪个分区，如果在ProducerRecord中指定了partition字段，那么就不再需要partitioner分区器进行分区了，如果没有指定，那么会根据key来将数据进行分区，如果partitioner和key都没有指定，那么就会采用默认的方式进行数据分区。

有没有指定partition可以从源码中看出：

public ProducerRecord(String topic, Integer partition, K key, V value) {}
    
     如果指定的partition,那就指定了数据发往哪个分区上，如果没有就会根据key来进行数据分区，如果2个都没有，那么会采用默认的分区策略来进行数据分区

**1.根据key进行分区**

public class CustomPartitioner {
        
        private static final Logger LOG = LoggerFactory.getLogger(CustomPartitioner.class);
        
        public static void main(String[] args) {
            //1.加载配置信息
            Properties prop = loadProperties();
            
            //2.创建生产者
            KafkaProducer<Integer,String> producer = new KafkaProducer<>(prop);
            
            String sendContent = "hello_kafka";
            IntStream.range(0, 10).forEach(i ->{
                try {
                    ProducerRecord<Integer,String> record = new ProducerRecord<>("test1",i,sendContent+"_"+i);　　//topic key value
                    Future<RecordMetadata> future = producer.send(record);
                    RecordMetadata recordMetadata = future.get();
                    LOG.info("发送的数据是 :{},offset:是{},partition是：{}",sendContent,recordMetadata.offset(),recordMetadata.partition());
                } catch (Exception e) {
                    e.printStackTrace();
                }
                
            });
            
        }
         //配置文件的设置
        public static Properties loadProperties() {
            Properties prop = new Properties();
            prop.put("bootstrap.servers", "192.168.100.144:9092,192.168.100.145:9092,192.168.100.146:9092");
            prop.put("key.serializer", "org.apache.kafka.common.serialization.IntegerSerializer");
            prop.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
            prop.put("acks", "all");    //发送到所有的ISR队列中
            return prop;
        }
    }

** 2.自定义分区**

同样在使用自定义分区的时候，需要写实现类和在producer中配置引用

我们在这个示例中，根据key来分区，key在序列化的时候用的是IntegerSerializer,在ProducerRecord中我们没有指定partition

自定义分区器

public class CustomPartition implements Partitioner{
    
        @Override
        public void configure(Map<String, ?> configs) {
            // TODO Auto-generated method stub
            
        }
    
        @SuppressWarnings({ "null", "unused" })
        @Override
        public int partition(String topic, Object key, byte[] keyBytes, Object value, byte[] valueBytes, Cluster cluster) {
            
            int partitionNum = cluster.partitionsForTopic(topic).size();
            int partition = (Integer)key%partitionNum;
            return key == null? 0:partition;
        }
    
        @Override
        public void close() {
            // TODO Auto-generated method stub
            
        }
    }

生产者

public class ProducerDemo {
        
        private static final Logger LOG = LoggerFactory.getLogger(ProducerDemo.class);
            
        public static void main(String[] args) throws InterruptedException, ExecutionException {
            //1.加载配置信息
            Properties prop = loadProperties();
            
            //2.创建生产者
            KafkaProducer<Integer,String> producer = new KafkaProducer<>(prop);
            
            //3.发送内容
            String sendContent = "hello_kafka";
            IntStream.range(0, 10).forEach(i ->{
                try {
                    ProducerRecord<Integer,String> record = new ProducerRecord<>("test1",i,sendContent+"_"+i);
                    Future<RecordMetadata> future = producer.send(record);
                    RecordMetadata recordMetadata = future.get();
                    LOG.info("发送的数据是 :{},offset:是{},partition是：{}",sendContent,recordMetadata.offset(),recordMetadata.partition());
                } catch (Exception e) {
                    e.printStackTrace();
                }
                
            });                
            producer.close();    //回调拦截器中的close方法
            
        }
            
        //配置文件的设置
        public static Properties loadProperties() {
            Properties prop = new Properties();
            prop.put("bootstrap.servers", "192.168.100.144:9092,192.168.100.145:9092,192.168.100.146:9092");
            prop.put("key.serializer", "org.apache.kafka.common.serialization.IntegerSerializer");
            prop.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
            prop.put("partitioner.class", "com.zpb.partitioner.CustomPartition");
            prop.put("acks", "all");
            return prop;
        }
    }

转载于:https://www.cnblogs.com/MrRightZhao/p/11345846.html