Question

在带有Kafka的Spring Boot中，我可以如下设置ConsumerFactory的属性：

@EnableKafka
@Configuration
public class KafkaConsumerConfig {

@Bean
public ConsumerFactory<String, EnrichedOrder> consumerFactory() {
    Map<String, Object> props = new HashMap<>();
    props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
    props.put(ConsumerConfig.GROUP_ID_CONFIG, "barnwaldo");
    props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
    props.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, "1000");
    props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
    props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, EnrichedOrderDeserializer.class);

    return new DefaultKafkaConsumerFactory<>(props);
}

@Bean
public ConcurrentKafkaListenerContainerFactory<String, EnrichedOrder> kafkaListenerContainerFactory() {
    ConcurrentKafkaListenerContainerFactory<String, EnrichedOrder> factory = new ConcurrentKafkaListenerContainerFactory<>();
    factory.setConsumerFactory(consumerFactory());
    return factory;
}

}

使用Kafka Streams，我可以在代码中设置属性，如下所示：

    final Properties streamsConfiguration = new Properties();
    streamsConfiguration.put(StreamsConfig.APPLICATION_ID_CONFIG, "wordcount-lambda-example");
    streamsConfiguration.put(StreamsConfig.CLIENT_ID_CONFIG, "wordcount-lambda-example-client");
    streamsConfiguration.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
    streamsConfiguration.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
    streamsConfiguration.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
    streamsConfiguration.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, 10 * 1000);
    streamsConfiguration.put(StreamsConfig.CACHE_MAX_BYTES_BUFFERING_CONFIG, 0);
    final KafkaStreams streams = new KafkaStreams(builder.build(), streamsConfiguration);

在使用Spring Cloud Streams和Kafka Streams时，所有属性似乎只能通过资源文件夹中的application.properties或application.yml文件输入，例如

spring.cloud.stream.bindings:
    output:
        contentType: application/json
        destination: data2
    input:
        contentType: application/json
        destination: data1
spring.cloud.stream.kafka.streams:
    binder:
      brokers: localhost
      configuration:
        commit.interval.ms: 1000
        default.key.serde: org.apache.kafka.common.serialization.Serdes$StringSerde
        default.value.serde: org.apache.kafka.common.serialization.Serdes$StringSerde
    bindings.input.consumer:
        applicationId: data-tester

当将Spring Cloud Streams与Kafka Streams一起使用时，是否可以在HashMap或Properties中包含属性。

也许可以通过KafkaMessageChannelBinder或通过扩展AbstractMessageChannelBinder来完成此操作-参见https://github.com/spring-cloud/spring-cloud-stream-binder-kafka/blob/7355ada4613ad50fe95430f1859d4ea65f004be1/spring-cloud-stream-binder-kafka/src/main/java/org/springframework/cloud/stream/binder/kafka/KafkaMessageChannelBinder.java。

我找不到与此相关的文档；任何帮助都将不胜感激。

Answer 1

默认情况下，它在活页夹级别具有支持，该属性应在属性前加上spring.cloud.stream.kafka.streams.binder.文字

https://cloud.spring.io/spring-cloud-static/Greenwich.M3/multi/multi__apache_kafka_streams_binder.html#_configuration_options_3

如果看到KafkaStreamsBinderSupportAutoConfiguration类，则可以看到从yaml属性读取并设置为kafka流的bean配置。

https://github.com/spring-cloud/spring-cloud-stream-binder-kafka/blob/master/spring-cloud-stream-binder-kafka-streams/src/main/java/org/springframework/cloud/stream/binder/kafka/streams/KafkaStreamsBinderSupportAutoConfiguration.java

Answer 2

谢谢您的回答-我经常引用第一个参考链接，并将通过Github链接复审KafkaStreamsBinderSupportAutoConfiguration类。

也许我可以问一个关于属性的更具体的问题...

我的理解是，Kafka流可以通过配置Kafka Streams来加密传输中的数据（与目标Kafka集群通信时）并启用客户端身份验证，从而执行安全的流处理。在Spring Cloud Streams Kafka Streams实现中，如何在applications.yml属性文件中实现以下功能？具体是SECURITY和SSL属性？

SELECT Employee.FirstName
    , hrt.Social
    , pt.Sallary
FROM Employee e
LEFT JOIN HRTable hrt ON e.ID = hrt.ID
LEFT JOIN PayrollTable pt ON pt.ID = e.ID
                        AND pt.ID = @EmployeeID
WHERE e.ID = @EmployeeID

再次感谢您的帮助。

使用Spring Cloud Streams时如何在代码中设置Kafka Streams属性？

2 个答案: