January 2018
Beginner to intermediate
234 pages
7h 8m
Chinese
Content preview from Kafka权威指南
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3
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下面是一个自定义分区器的例子：
import org.apache.kafka.clients.producer.Partitioner;
import org.apache.kafka.common.Cluster;
import org.apache.kafka.common.PartitionInfo;
import org.apache.kafka.common.record.InvalidRecordException;
import org.apache.kafka.common.utils.Utils;
public class BananaPartitioner implements Partitioner {
public void configure(Map<String, ?> configs) {}
➊
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) || (!(key instanceOf ...
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