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;
public class RoundRobinPartitioner implements Partitioner {
private int currentPartition;
@Override
public void configure(Map<String, ?> configs) {
// 初始化当前分区索引
currentPartition = 0;
}
@Override
public int partition(String topic, Object key, byte[] keyBytes, Object value, byte[] valueBytes, Cluster cluster) {
List<PartitionInfo> partitions = cluster.partitionsForTopic(topic);
int numPartitions = partitions.size();
// 轮询选择下一个分区
int selectedPartition = currentPartition;
currentPartition = (currentPartition + 1) % numPartitions;
return selectedPartition;
}
@Override
public void close() {
// 可选:清理资源
}
}
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("partitioner.class", "com.example.RoundRobinPartitioner");
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;
import java.util.Random;
public class RandomPartitioner implements Partitioner {
private final Random random = new Random();
@Override
public int partition(String topic, Object key, byte[] keyBytes, Object value, byte[] valueBytes, Cluster cluster) {
List<PartitionInfo> partitions = cluster.partitionsForTopic(topic);
int numPartitions = partitions.size();
return random.nextInt(numPartitions);
}
@Override
public void close() {
}
@Override
public void configure(Map<String, ?> configs) {
}
}
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("partitioner.class", "com.example.RandomPartitioner");
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;
public class KeyPartitioner implements Partitioner {
@Override
public int partition(String topic, Object key, byte[] keyBytes, Object value, byte[] valueBytes, Cluster cluster) {
List<PartitionInfo> partitions = cluster.partitionsForTopic(topic);
int numPartitions = partitions.size();
if (keyBytes == null) {
// 如果 key 为 null,则使用轮询分区策略
return Math.abs(key.hashCode()) % numPartitions;
} else {
// 使用 key 的哈希码来确定分区
return Math.abs(Utils.murmur2(keyBytes)) % numPartitions;
}
}
@Override
public void close() {
// 可选:清理资源
}
@Override
public void configure(Map<String, ?> configs) {
// 可选:配置方法
}
}
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("partitioner.class", "com.example.KeyPartitioner");
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;
public class CustomPartitioner implements Partitioner {
@Override
public int partition(String topic, Object key, byte[] keyBytes, Object value, byte[] valueBytes, Cluster cluster) {
List<PartitionInfo> partitions = cluster.partitionsForTopic(topic);
int numPartitions = partitions.size();
// 自定义分区逻辑
// 根据消息的 key 或 value 来选择分区
// 这里以 key 的哈希值作为分区选择依据
int partition = Math.abs(key.hashCode()) % numPartitions;
return partition;
}
@Override
public void close() {
// 可选:清理资源
}
@Override
public void configure(Map<String, ?> configs) {
// 可选:配置分区器
}
}
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("partitioner.class", "com.example.CustomPartitioner");
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