apache-kafka - 无法在 Spring Cloud kafka 中为每个主题/绑定器级别设置 serde、生产者和消费者属性
问题描述
我正在尝试使用 spring cloud kafka binder 来启动简单的 pub-sub 应用程序。但是我无法在 application.yml 中设置 Serializer、DeSerialzer 属性和其他生产者和消费者属性。我一直收到序列化/反序列化错误。甚至 spring boot 项目中的 kafka 日志显示生产者和消费者配置仍然是用户 ByteArraySerializer。下面是相同的代码。
pom.xml
<?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>2.2.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>io.github.kprasad99.kafka</groupId>
<artifactId>kp-kafka-streams-example</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>kp-kafka-streams-example</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>11</java.version>
<spring-cloud.version>Hoxton.SR1</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- <dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-streams</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream-binder-kafka-streams</artifactId>
</dependency> -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream-binder-kafka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream-test-support</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
处理器.java
public interface Processor {
String INPUT="k-msg-source";
String OUTPUT="k-msg-sink";
@Input(INPUT)
SubscribableChannel input();
@Output(OUTPUT)
MessageChannel output();
}
KRest.java
@RestController 公共类 KRest {
@Autowired
private Processor processor;
@GetMapping("/send")
public ResponseEntity<Void> send(@RequestParam("key")String key, @RequestParam("msg") String text){
processor.input().send(MessageBuilder.withPayload(Message.builder().text(text).build()).setHeader(KafkaHeaders.MESSAGE_KEY, key).build());
return ResponseEntity.ok().build();
}
}
消息.java
@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class Message {
private String text;
}
最后是 application.yml
spring:
cloud:
stream:
bindings:
k-msg-source:
binder: kafka
content-type: application/json
destination: topic.kp.msg
group: kp.msg.source
k-msg-sink:
binder: kafka
content-type: application/json
destination: topic.kp.msg
group: kp.msg.sink
producer:
partition-count: 10
binders:
kafka:
type: kafka
environment:
spring.cloud.stream.kafka.binder:
brokers: localhost:9092
configuration:
value.serde: JsonSerde
key.serde: StringSerde
producer:
value.serde: JsonSerde
key.serde: StringSerde
replication-factor: 1
版本
- 弹簧启动:2.2.4
- 弹簧云:Hoxton.SR1
- spring-cloud-stream-kafka-binder:3.0.1
解决方案
Serde
s 由Kafka Streams binder使用。
使用MessageChannel
binder,属性是value.serializer
and value.deserializer
(and key...
), and key/value.deserializer
。
您还必须指定类的完全限定名称。
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