kafka2.5.0自定义分区器

自定义分区器：

import org.apache.kafka.clients.producer.Partitioner;
import org.apache.kafka.common.Cluster;
import org.apache.kafka.common.PartitionInfo;

import java.util.List;
import java.util.Map;

/**
 * @author King老师   
 */
public class SelfPartitioner implements Partitioner {
    public int partition(String topic, Object key, byte[] keyBytes,
                         Object value, byte[] valueBytes, Cluster cluster) {
        //拿到
        List<PartitionInfo> partitionInfos = cluster.partitionsForTopic(topic);
        //TODO 分区数
        int num = partitionInfos.size();
        //TODO 根据value与分区数求余的方式得到分区ID
        int parId = ((String)value).hashCode()%num;
        return parId;
    }

    public void close() {
        //do nothing
    }

    public void configure(Map<String, ?> configs) {
        //do nothing
    }

}

配置到kafka：

ProducerConfig.PARTITIONER_CLASS_CONFIG, "cn.enjoyedu.selfpartition.SelfPartitioner"

更多配置参考：《kafka2.5.0生产者与消费者配置详解》

end.