文章目录
1、kafka数据传递语义 2、kafka生产者事务 3、事务消息发送 3.1、application.yml配置 3.2、创建生产者监听器 3.3、创建生产者拦截器 3.4、发送消息测试 3.5、使用Java代码创建主题分区副本 3.6、屏蔽 kafka debug 日志 logback.xml 3.7、引入spring-kafka依赖 3.8、控制台日志
1、kafka数据传递语义
kafka发送消息时是否需要重试
仅发送一次:生产者发送消息后不重试,只发送一次 可能丢失消息 效率最高
至少一次:生产者发送消息后重试,可能重试多次 效率差
精准一次发送:生产者发送消息后无论是否重复发送 发送了多少次,在 kafka broker 中只保存一次消息,通过幂等性 + 生产者事务来实现
kafak天然支持幂等性,每个消息头中带了一个唯一的标志 kafka broker 根据此标志判断消息是否已经发送过,生产者事务可以保证数据没有最终发送成功时,消费者不可以消费,如果生产者发送消息时出现异常会自动回滚(清除之前发送的事务中的消息)
kafka天然幂等性:但是指的是生产者事务 生产消息时的幂等性,发送消息时消息中带唯一标识、broker接收到消息时如果重复不再保存,事务没提交消费者不能消费改消息
2、kafka生产者事务
保证消息生产的幂等性
一组消息要么一起成功 被消费者消息 要么一起失败都不能被消费者消费
配置ack为-1 分区所有副本均落盘成功
配置生产者重试(发送失败可以继续发送:需要保证发送失败后再次发送消息到kafka实现 精准一次发送)
需要给事务分配事务id(区分一个事务中的多条消息)
3、事务消息发送
3.1、application.yml配置
server :
port : 8110
spring :
kafka :
bootstrap-servers : 192.168.74.148: 9095 , 192.168.74.148: 9096 , 192.168.74.148: 9097
producer :
retries : 1
acks : -1
transaction-id-prefix : tx_
batch-size : 16384
buffer-memory : 33554432
key-serializer : org.apache.kafka.common.serialization.StringSerializer
value-serializer : org.apache.kafka.common.serialization.StringSerializer
3.2、创建生产者监听器
package com. atguigu. kafka. listener ;
import org. apache. kafka. clients. producer. ProducerRecord ;
import org. apache. kafka. clients. producer. RecordMetadata ;
import org. springframework. kafka. support. ProducerListener ;
@Component
public class MyKafkaProducerListener implements ProducerListener < String , String > {
@Override
public void onSuccess ( ProducerRecord < String , String > producerRecord, RecordMetadata recordMetadata) {
System . out. println ( "MyKafkaProducerListener消息发送成功:" + "topic=" + producerRecord. topic ( )
+ ",partition = " + producerRecord. partition ( )
+ ",key = " + producerRecord. key ( )
+ ",value = " + producerRecord. value ( )
+ ",offset = " + recordMetadata. offset ( ) ) ;
}
@Override
public void onError ( ProducerRecord < String , String > producerRecord, RecordMetadata recordMetadata, Exception exception) {
System . out. println ( "MyKafkaProducerListener消息发送失败:" + "topic=" + producerRecord. topic ( )
+ ",partition = " + producerRecord. partition ( )
+ ",key = " + producerRecord. key ( )
+ ",value = " + producerRecord. value ( )
+ ",offset = " + recordMetadata. offset ( ) ) ;
System . out. println ( "异常信息:" + exception. getMessage ( ) ) ;
}
}
3.3、创建生产者拦截器
package com. atguigu. kafka. interceptor ;
import org. apache. kafka. clients. producer. ProducerInterceptor ;
import org. apache. kafka. clients. producer. ProducerRecord ;
import org. apache. kafka. clients. producer. RecordMetadata ;
import org. springframework. stereotype. Component ;
import java. util. Map ;
@Component
public class MyKafkaInterceptor implements ProducerInterceptor < String , String > {
@Override
public ProducerRecord < String , String > onSend ( ProducerRecord < String , String > producerRecord) {
System . out. println ( "生产者即将发送消息:topic = " + producerRecord. topic ( )
+ ",partition:" + producerRecord. partition ( )
+ ",key = " + producerRecord. key ( )
+ ",value = " + producerRecord. value ( ) ) ;
return null ;
}
@Override
public void onAcknowledgement ( RecordMetadata recordMetadata, Exception e) {
if ( e == null ) {
System . out. println ( "消息发送成功:topic = " + recordMetadata. topic ( )
+ ",partition:" + recordMetadata. partition ( )
+ ",offset=" + recordMetadata. offset ( )
+ ",timestamp=" + recordMetadata. timestamp ( ) ) ;
}
}
@Override
public void close ( ) {
}
@Override
public void configure ( Map < String , ? > map) {
}
}
3.4、发送消息测试
package com. atguigu. kafka. producer ;
import com. atguigu. kafka. interceptor. MyKafkaInterceptor ;
import jakarta. annotation. PostConstruct ;
import jakarta. annotation. Resource ;
import org. junit. jupiter. api. Test ;
import org. springframework. boot. test. context. SpringBootTest ;
import org. springframework. kafka. core. KafkaTemplate ;
import java. io. IOException ;
@SpringBootTest
class KafkaProducerApplicationTests {
@Resource
KafkaTemplate kafkaTemplate;
@Resource
MyKafkaInterceptor myKafkaInterceptor;
@PostConstruct
public void init ( ) {
kafkaTemplate. setProducerInterceptor ( myKafkaInterceptor) ;
}
@Test
void contextLoads ( ) throws IOException {
kafkaTemplate. send ( "my_topic1" , "spring-kafka-生产者监听器" ) ;
System . in. read ( ) ;
}
@Test
void testTransaction ( ) throws IOException {
kafkaTemplate. executeInTransaction ( ( var1) -> {
var1. send ( "my_topic1" , 0 , "" , "spring-kafka-事务1" ) ;
var1. send ( "my_topic1" , 0 , "" , "spring-kafka-事务2" ) ;
int i = 1 / 0 ;
var1. send ( "my_topic1" , 0 , "" , "spring-kafka-事务3" ) ;
return "发送消息失败" ;
} ) ;
System . in. read ( ) ;
}
}
3.5、使用Java代码创建主题分区副本
package com. atguigu. kafka. config ;
import org. apache. kafka. clients. admin. NewTopic ;
import org. springframework. context. annotation. Bean ;
import org. springframework. kafka. config. TopicBuilder ;
import org. springframework. stereotype. Component ;
@Component
public class KafkaTopicConfig {
@Bean
public NewTopic myTopic1 ( ) {
return TopicBuilder . name ( "my_topic1" )
. partitions ( 3 )
. replicas ( 3 )
. build ( ) ;
}
}
3.6、屏蔽 kafka debug 日志 logback.xml
< configuration>
< logger name = " org.apache.kafka.clients" level = " debug" />
</ configuration>
3.7、引入spring-kafka依赖
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd" >
< modelVersion> 4.0.0</ modelVersion>
< parent>
< groupId> org.springframework.boot</ groupId>
< artifactId> spring-boot-starter-parent</ artifactId>
< version> 3.0.5</ version>
< relativePath/>
</ parent>
< groupId> com.atguigu.kafka</ groupId>
< artifactId> kafka-producer</ artifactId>
< version> 0.0.1-SNAPSHOT</ version>
< name> kafka-producer</ name>
< description> kafka-producer</ description>
< properties>
< java.version> 17</ java.version>
</ properties>
< dependencies>
< dependency>
< groupId> org.springframework.boot</ groupId>
< artifactId> spring-boot-starter</ artifactId>
</ dependency>
< dependency>
< groupId> org.springframework.boot</ groupId>
< artifactId> spring-boot-starter-test</ artifactId>
< scope> test</ scope>
</ dependency>
< dependency>
< groupId> org.springframework.kafka</ groupId>
< artifactId> spring-kafka</ artifactId>
</ dependency>
</ dependencies>
< build>
< plugins>
< plugin>
< groupId> org.springframework.boot</ groupId>
< artifactId> spring-boot-maven-plugin</ artifactId>
</ plugin>
</ plugins>
</ build>
</ project>
3.8、控制台日志
生产者即将发送消息:topic = my_topic1,partition: 0 ,key = ,value = spring- kafka- 事务1
生产者即将发送消息:topic = my_topic1,partition: 0 ,key = ,value = spring- kafka- 事务2
MyKafkaProducerListener消息发送失败:topic= my_topic1,partition = 0 ,key = ,value = spring- kafka- 事务1 ,offset = - 1
异常信息:Failing batch since transaction was aborted
MyKafkaProducerListener消息发送失败:topic= my_topic1,partition = 0 ,key = ,value = spring- kafka- 事务2 ,offset = - 1
异常信息:Failing batch since transaction was aborted
java. lang. ArithmeticException: / by zero