java - 如何检查某个消费者是否使用 java 连接到 Kafka 0.9.0.x？

Question

如何在 kafka 上获取连接的消费者列表？ 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 中连接的消费者列表？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 和来自 maven 的以下 java 库:

<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 cmd 提示符。然后继续“zookeeper-shell.bat”和 ls/consumers 然后显示 [console-consumer-6008]，但我的程序未显示消费者。使用 zkClient.getChildren(ZkUtils.ConsumersPath()) 我现在只能查看提到的消费者。

Answer 1

不确定您到底需要什么信息，但我做了一个示例程序，它提供的信息与 kafka-consumer-groups.sh --describe 相同。

要使用此代码，请将此依赖项添加到您的 pom。

<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);
        }
    }
}