kafka Consumer를 java 로 구현해보자

Karim·2021년 11월 1일
5

kafka 예제

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1. Version

💬

  • Kafka : 2.6.0
  • grdle : kafka-clients.2.8.1

2. build.gradle

💬 build.gredle dependencies

dependencies {
    compile group: 'org.apache.kafka', name: 'kafka-clients', version: '2.8.1'
}

3. Kafka Consumer 구현

💬 java code

예제는 간단!
kafka 설치한 서버에 어떠한 시스템이 메세지를 게시하면
그 해당 메세지를 구독하는 코드이다.

package kafkaConsumer;

import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;

import java.util.Collections;
import java.util.Properties;

/**
 * Created by Karim
 * Date : 2021-11-01
 * Time : 오전 10:48
 */

public class KafkaConsumerBasis {

    private static final String KAFKA_SINGLE_IP = "ServerIp:KafkaPort";
    private static final String TOPIC_NAME = "karim-topic";

    public static void main(String[] args) {
        Properties props = new Properties();

        // kafka server host 및 port 설정
        props.put("bootstrap.servers", KAFKA_SINGLE_IP);
        props.put("group.id", "karim-group-id-1"); // group-id 설정
        props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer"); // key deserializer
        props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer"); // value deserializer

        // consumer 생성
        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
        // topic 설정
        consumer.subscribe(Collections.singletonList(TOPIC_NAME));

        try {
            while (true) {
                // 계속 loop를 돌면서 producer의 message를 띄운다.
                ConsumerRecords<String, String> records = consumer.poll(100);
                for (ConsumerRecord<String, String> record : records)
                    System.out.println(record.value());
            }
        } catch (Exception e) {
        } finally {
            consumer.close();
        }
    }
}

4. Kafka Console Producer

💬 console view

[karim@kafka-single bin]$ ./kafka-console-producer.sh --broker-list localhost:9092 --topic karim-topic
> Karim velog cuteeeee-

5. runining log

💬 log

[11:54:28.862],ConsumerConfig values: 
	allow.auto.create.topics = true
	auto.commit.interval.ms = 5000
	auto.offset.reset = latest
	bootstrap.servers = [...:9092]
	check.crcs = true
	client.dns.lookup = use_all_dns_ips
	client.id = consumer-karim-group-id-1-1
	client.rack = 
	connections.max.idle.ms = 540000
	default.api.timeout.ms = 60000
	enable.auto.commit = true
	exclude.internal.topics = true
	fetch.max.bytes = 52428800
	fetch.max.wait.ms = 500
	fetch.min.bytes = 1
	group.id = karim-group-id-1
	group.instance.id = null
	heartbeat.interval.ms = 3000
	interceptor.classes = []
	internal.leave.group.on.close = true
	internal.throw.on.fetch.stable.offset.unsupported = false
	isolation.level = read_uncommitted
	key.deserializer = class org.apache.kafka.common.serialization.StringDeserializer
	max.partition.fetch.bytes = 1048576
	max.poll.interval.ms = 300000
	max.poll.records = 500
	metadata.max.age.ms = 300000
	metric.reporters = []
	metrics.num.samples = 2
	metrics.recording.level = INFO
	metrics.sample.window.ms = 30000
	partition.assignment.strategy = [class org.apache.kafka.clients.consumer.RangeAssignor]
	receive.buffer.bytes = 65536
	reconnect.backoff.max.ms = 1000
	reconnect.backoff.ms = 50
	request.timeout.ms = 30000
	retry.backoff.ms = 100
	sasl.client.callback.handler.class = null
	sasl.jaas.config = null
	sasl.kerberos.kinit.cmd = /usr/bin/kinit
	sasl.kerberos.min.time.before.relogin = 60000
	sasl.kerberos.service.name = null
	sasl.kerberos.ticket.renew.jitter = 0.05
	sasl.kerberos.ticket.renew.window.factor = 0.8
	sasl.login.callback.handler.class = null
	sasl.login.class = null
	sasl.login.refresh.buffer.seconds = 300
	sasl.login.refresh.min.period.seconds = 60
	sasl.login.refresh.window.factor = 0.8
	sasl.login.refresh.window.jitter = 0.05
	sasl.mechanism = GSSAPI
	security.protocol = PLAINTEXT
	security.providers = null
	send.buffer.bytes = 131072
	session.timeout.ms = 10000
	socket.connection.setup.timeout.max.ms = 30000
	socket.connection.setup.timeout.ms = 10000
	ssl.cipher.suites = null
	ssl.enabled.protocols = [TLSv1.2]
	ssl.endpoint.identification.algorithm = https
	ssl.engine.factory.class = null
	ssl.key.password = null
	ssl.keymanager.algorithm = SunX509
	ssl.keystore.certificate.chain = null
	ssl.keystore.key = null
	ssl.keystore.location = null
	ssl.keystore.password = null
	ssl.keystore.type = JKS
	ssl.protocol = TLSv1.2
	ssl.provider = null
	ssl.secure.random.implementation = null
	ssl.trustmanager.algorithm = PKIX
	ssl.truststore.certificates = null
	ssl.truststore.location = null
	ssl.truststore.password = null
	ssl.truststore.type = JKS
	value.deserializer = class org.apache.kafka.common.serialization.StringDeserializer

[11:54:29.530],Kafka version: 2.8.1
[11:54:29.532],Kafka commitId: 839b886f9b732b15
[11:54:29.532],Kafka startTimeMs: 1635735269527
[11:54:29.535],[Consumer clientId=consumer-karim-group-id-1-1, groupId=karim-group-id-1] Subscribed to topic(s): karim-topic
[11:54:29.989],[Consumer clientId=consumer-karim-group-id-1-1, groupId=karim-group-id-1] Cluster ID: ig7CcFmqSeCTqaj1ozuCEA
[11:54:29.991],[Consumer clientId=consumer-karim-group-id-1-1, groupId=karim-group-id-1] Discovered group coordinator 192.168.124.238:1146 (id: 2147483646 rack: null)
[11:54:29.994],[Consumer clientId=consumer-karim-group-id-1-1, groupId=karim-group-id-1] (Re-)joining group
[11:54:30.008],[Consumer clientId=consumer-karim-group-id-1-1, groupId=karim-group-id-1] (Re-)joining group
[11:54:33.013],[Consumer clientId=consumer-karim-group-id-1-1, groupId=karim-group-id-1] Successfully joined group with generation Generation{generationId=1, memberId='consumer-karim-group-id-1-1-c6cce5fa-5e99-4361-82e0-13bab637caab', protocol='range'}
[11:54:33.017],[Consumer clientId=consumer-karim-group-id-1-1, groupId=karim-group-id-1] Finished assignment for group at generation 1: {consumer-karim-group-id-1-1-c6cce5fa-5e99-4361-82e0-13bab637caab=Assignment(partitions=[karim-topic-0])}
[11:54:33.024],[Consumer clientId=consumer-karim-group-id-1-1, groupId=karim-group-id-1] Successfully synced group in generation Generation{generationId=1, memberId='consumer-karim-group-id-1-1-c6cce5fa-5e99-4361-82e0-13bab637caab', protocol='range'}
[11:54:33.025],[Consumer clientId=consumer-karim-group-id-1-1, groupId=karim-group-id-1] Notifying assignor about the new Assignment(partitions=[karim-topic-0])
[11:54:33.028],[Consumer clientId=consumer-karim-group-id-1-1, groupId=karim-group-id-1] Adding newly assigned partitions: karim-topic-0
[11:54:33.037],[Consumer clientId=consumer-karim-group-id-1-1, groupId=karim-group-id-1] Found no committed offset for partition karim-topic-0
[11:54:33.053],[Consumer clientId=consumer-karim-group-id-1-1, groupId=karim-group-id-1] Resetting offset for partition karim-topic-0 to position FetchPosition{offset=33, offsetEpoch=Optional.empty, currentLeader=LeaderAndEpoch{leader=Optional[192.168.124.238:1146 (id: 1 rack: null)], epoch=0}}.

Karim velog cuteeeee-
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