如何检查某个消费者是否使用java连接到Kafka 0.9.0.x？

Question

如何获取kafka上的连接消费者列表？由于消费者在代理上连接,是否有像ZkClient/ZkUtils这样的java实用程序来获取Kafka 0.9.0.x中连接消费者的列表？就像我们使用以下实用程序获取经纪人列表一样:

        ZkClient zkClient = new ZkClient(endpoint.getZookeeperConnect(), 60000);

        if(zkClient!=null){
            List<String> brokerIds = zkClient.getChildren(ZkUtils.BrokerIdsPath());
            if(CollectionUtils.isNotEmpty(brokerIds) &&  brokerIds.contains(brokerId)){
                logger.debug("Broker:{{}} is connected to Zookeeper.",brokerId);
                flag = true;    
            }
            else{
                logger.error("ERROR:Broker:{{}} is not connected to Zookeeper.",brokerId);
            }
            zkClient.close();
        }

我正在使用Kafka 0.9.0.x和maven下面的java lib:

<dependency>
    <groupId>org.apache.kafka</groupId>
    <artifactId>kafka_2.11</artifactId>
    <version>0.9.0.1</version>
</dependency>

更新:

我打开了一个' kafka-console-consumer.bat '并运行了一次然后越过了cmd提示符.然后继续" zookeeper-shell.bat "和ls/consumer然后显示[console-consumer-6008],但我的编程消费者没有显示.使用zkClient.getChildren(ZkUtils.ConsumersPath())我现在可以只查看提到的消费者.

Answer 1

不确定你需要什么信息,但我做了一个示例程序,提供了与kafka-consumer-groups.sh相同的信息 - 描述.

要使用此代码,请将此依赖项添加到您的pom中.

<dependency>
    <groupId>org.apache.kafka</groupId>
    <artifactId>kafka_2.11</artifactId>
    <version>0.9.0.1</version>
</dependency>

然后:

import org.apache.kafka.clients.CommonClientConfigs;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.common.TopicPartition;
import kafka.admin.AdminClient;
import kafka.coordinator.GroupOverview;

Properties props = new Properties();
props.put(CommonClientConfigs.BOOTSTRAP_SERVERS_CONFIG, "kafka-1:9092");
AdminClient adminClient = AdminClient.create(props);

List<GroupOverview> groups =  scala.collection.JavaConversions.seqAsJavaList(
        adminClient.listAllConsumerGroupsFlattened());
for (GroupOverview group : groups) {
    String groupId = group.groupId();

    Properties consProps = new Properties();
    consProps.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "kafka-1:9092");
    consProps.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
    consProps.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, "false");
    consProps.put(ConsumerConfig.SESSION_TIMEOUT_MS_CONFIG, "30000");
    consProps.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
    consProps.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
    KafkaConsumer consumer = new KafkaConsumer(consProps);

    List<AdminClient.ConsumerSummary> groupSummaries = scala.collection.JavaConversions.seqAsJavaList(
            adminClient.describeConsumerGroup(groupId));

    System.out.println("GROUP, TOPIC, PARTITION, CURRENT OFFSET, LOG END OFFSET, LAG, OWNER");

    for (AdminClient.ConsumerSummary summary : groupSummaries) {
        String owner = summary.clientId() + "_" + summary.clientHost();
        List<TopicPartition> topicPartitions = scala.collection.JavaConversions.seqAsJavaList(
                summary.assignment());
        for (TopicPartition tp : topicPartitions) {

            // Get current offset
            long currentOffset = consumer.committed(tp).offset();

            // get log end offset
            consumer.assign(Arrays.asList(tp));
            consumer.seekToEnd();
            long logEndOffset = consumer.position(tp);

            long lag = logEndOffset - currentOffset;

            System.out.println(groupId + ", " + tp.topic() + ", " + tp.partition() + ", " +
                    currentOffset + ", " + logEndOffset + ", " + lag + ", " + owner);
        }
    }
}