这是indexloc提供的服务，不要输入任何密码
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Merged
merged 3 commits into from
Mar 16, 2024
Merged

BAEL-6946 added code for commit offsets #15748

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8867e35
added code for commit offsets
Jan 26, 2024
6cd68f9
added jdk9 profile
Feb 7, 2024
b57553e
format the code
Feb 15, 2024
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9 changes: 9 additions & 0 deletions apache-kafka-3/README.md
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## Apache Kafka

This module contains articles about Apache Kafka.

##### Building the project
You can build the project from the command line using: *mvn clean install*, or in an IDE.

### Relevant Articles:

48 changes: 48 additions & 0 deletions apache-kafka-3/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>apache-kafka-3</artifactId>
<name>apache-kafka-3</name>

<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>

<dependencies>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>${kafka.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${org.slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson.databind.version}</version>
</dependency>
</dependencies>

<properties>
<kafka.version>3.6.1</kafka.version>
<jackson.databind.version>2.15.2</jackson.databind.version>
</properties>
<profiles>
<profile>
<id>integration-jdk9-and-above</id>
</profile>
</profiles>
</project>
23 changes: 23 additions & 0 deletions apache-kafka-3/src/main/java/com/baeldung/kafka/commitoffset/AsyncCommit.java
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package com.baeldung.kafka.commitoffset;

import com.baeldung.kafka.commitoffset.config.KafkaConfigProperties;

import java.time.Duration;

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

public class AsyncCommit {

public static void main(String[] args) {

KafkaConsumer<Long, String> consumer = new KafkaConsumer<>(KafkaConfigProperties.getProperties());
consumer.subscribe(KafkaConfigProperties.getTopic());
ConsumerRecords<Long, String> messages = consumer.poll(Duration.ofSeconds(10));
for (ConsumerRecord<Long, String> message : messages) {
// processed message
consumer.commitAsync();
}
}
}
26 changes: 26 additions & 0 deletions apache-kafka-3/src/main/java/com/baeldung/kafka/commitoffset/AutomaticCommit.java
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package com.baeldung.kafka.commitoffset;

import com.baeldung.kafka.commitoffset.config.KafkaConfigProperties;

import java.time.Duration;
import java.util.Properties;

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

public class AutomaticCommit {

public static void main(String[] args) {

Properties properties = KafkaConfigProperties.getProperties();
properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, "true");
KafkaConsumer<Long, String> consumer = new KafkaConsumer<>(properties);
consumer.subscribe(KafkaConfigProperties.getTopic());
ConsumerRecords<Long, String> messages = consumer.poll(Duration.ofSeconds(10));
for (ConsumerRecord<Long, String> message : messages) {
// processed message
}
}
}
34 changes: 34 additions & 0 deletions apache-kafka-3/src/main/java/com/baeldung/kafka/commitoffset/SpecificOffsetCommit.java
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package com.baeldung.kafka.commitoffset;

import com.baeldung.kafka.commitoffset.config.KafkaConfigProperties;

import java.time.Duration;
import java.util.HashMap;
import java.util.Map;

import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.clients.consumer.OffsetAndMetadata;
import org.apache.kafka.common.TopicPartition;

public class SpecificOffsetCommit {
public static void main(String[] args) {

KafkaConsumer<Long, String> consumer = new KafkaConsumer<>(KafkaConfigProperties.getProperties());
consumer.subscribe(KafkaConfigProperties.getTopic());
Map<TopicPartition, OffsetAndMetadata> currentOffsets = new HashMap<>();
int messageProcessed = 0;
while (true) {
ConsumerRecords<Long, String> messages = consumer.poll(Duration.ofSeconds(10));
for (ConsumerRecord<Long, String> message : messages) {
// processed message
messageProcessed++;
currentOffsets.put(new TopicPartition(message.topic(), message.partition()), new OffsetAndMetadata(message.offset() + 1));
if (messageProcessed % 50 == 0) {
consumer.commitSync(currentOffsets);
}
}
}
}
}
23 changes: 23 additions & 0 deletions apache-kafka-3/src/main/java/com/baeldung/kafka/commitoffset/SyncCommit.java
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package com.baeldung.kafka.commitoffset;

import com.baeldung.kafka.commitoffset.config.KafkaConfigProperties;

import java.time.Duration;

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

public class SyncCommit {

public static void main(String[] args) {

KafkaConsumer<Long, String> consumer = new KafkaConsumer<>(KafkaConfigProperties.getProperties());
consumer.subscribe(KafkaConfigProperties.getTopic());
ConsumerRecords<Long, String> messages = consumer.poll(Duration.ofSeconds(10));
for (ConsumerRecord<Long, String> message : messages) {
// processed message
consumer.commitSync();
}
}
}
31 changes: 31 additions & 0 deletions ...e-kafka-3/src/main/java/com/baeldung/kafka/commitoffset/config/KafkaConfigProperties.java
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package com.baeldung.kafka.commitoffset.config;

import java.util.ArrayList;
import java.util.Properties;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.common.serialization.StringDeserializer;

/**
* @author amitkumar
*/
public class KafkaConfigProperties {
public static final String MY_TOPIC = "my-topic";

public static Properties getProperties() {

Properties props = new Properties();
props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, "false");
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
props.put(ConsumerConfig.GROUP_ID_CONFIG, "MyFirstConsumer");
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
return props;
}

public static ArrayList<String> getTopic() {
ArrayList<String> topics = new ArrayList<>();
topics.add(MY_TOPIC);
return topics;
}
}
11 changes: 11 additions & 0 deletions apache-kafka-3/src/test/resources/logback.xml
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<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>

<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>
2 changes: 2 additions & 0 deletions pom.xml
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Expand Up @@ -690,6 +690,7 @@
<module>apache-httpclient4</module>
<module>apache-httpclient</module>
<module>apache-kafka-2</module>
<module>apache-kafka-3</module>
<module>apache-kafka</module>
<module>apache-libraries-2</module>
<module>apache-libraries</module>
Expand Down Expand Up @@ -930,6 +931,7 @@
<module>apache-httpclient4</module>
<module>apache-httpclient</module>
<module>apache-kafka-2</module>
<module>apache-kafka-3</module>
<module>apache-kafka</module>
<module>apache-libraries-2</module>
<module>apache-libraries</module>
Expand Down