无法使用kafka管理客户端API创建具有所需分区的kafka主题

Question

注意：主题创建是在代理级别启用的。另外，这个主题正在被创建，但是它是用分区1创建的。

NewTopic newTopic = new NewTopic(TOPIC_NAME, 10, (short) 1);
        CreateTopicsResult createTopicsResult = null;
        try {
            createTopicsResult = KafkaAdminClient.create(getAdminProperties()).createTopics(Collections.singletonList(newTopic));
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

但是，我可以使用Kafka管理客户端API的

Answer 1

我试图使用以下代码复制该代码，但没有成功：

import org.apache.kafka.clients.admin.AdminClient;
import org.apache.kafka.clients.admin.AdminClientConfig;
import org.apache.kafka.clients.admin.CreateTopicsResult;
import org.apache.kafka.clients.admin.KafkaAdminClient;
import org.apache.kafka.clients.admin.NewTopic;

import java.util.Collections;
import java.util.Properties;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class AdminApiDemo {

    private static final String BOOTSRAP_SERVER = "localhost:9092";
    private static final String TOPIC_NAME = "demoTopic";
    private static final int NUM_PARTITIONS = 3;
    private static final short NUM_REPLICAS = 1;

    private final AdminClient adminClient;

    private AdminApiDemo(Properties properties) {
        this.adminClient = KafkaAdminClient.create(properties);
    }

    public static void main(String[] args) {
        final Properties properties = new Properties();
        properties.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, BOOTSRAP_SERVER);

        new AdminApiDemo(properties).createTopic(TOPIC_NAME, NUM_PARTITIONS, NUM_REPLICAS);
    }

    private void createTopic(String topicName, int numPartitions, short numReplicas) {
        try {
            final NewTopic newTopic = new NewTopic(topicName, numPartitions, numReplicas);
            final CreateTopicsResult result = adminClient.createTopics(Collections.singletonList(newTopic));
            result.values().get(topicName).get(5, TimeUnit.SECONDS);
        } catch (InterruptedException | ExecutionException | TimeoutException e) {
            e.printStackTrace();
        }
    }
}

Kafka-topics-description显示了以下内容：

root@kafka:/# kafka-topics --bootstrap-server localhost:9092 --describe --topic demoTopic
Topic:demoTopic PartitionCount:3    ReplicationFactor:1 Configs:
    Topic: demoTopic    Partition: 0    Leader: 1   Replicas: 1 Isr: 1
    Topic: demoTopic    Partition: 1    Leader: 1   Replicas: 1 Isr: 1
    Topic: demoTopic    Partition: 2    Leader: 1   Replicas: 1 Isr: 1

我想，好吧，如果主题可能在创建之前就已经存在怎么办，但是我又得到了一个java.util.concurrent.executionexception:org.apache.kafka.common.errors.topicexistsexception：主题'demo topic'已经存在。，所以这也不可能是您的情况。