Quarkus Kafka Streams/反应式消息反序列化异常

Question

嘿，所以我正在尝试使用 Kafka Streams 和 MP Reactive Messaging 来读取 Kafka 主题，然后生成回它。

Kafka Streams 错误 -

org.apache.kafka.streams.errors.StreamsException: Deserialization exception handler is set to fail upon a deserialization error. If you would rather have the streaming pipeline continue after a deserialization error, please set the default.deserialization.exception.handler appropriately.

Reactive Messaging 错误类似，但基本上消息反序列化的 POJO 看起来像这样 -

    public class FinancialMessage {
    
    public String user_id;
    public String stock_symbol;
    public String exchange_id;
    public String trade_type;
    public String date_created;
    public String date_submitted;
    public int quantity;
    public double stock_price;
    public double total_cost;
    public int institution_id;
    public int country_id;
    public boolean compliance_services;
    public boolean technical_validation;
    public boolean schema_validation;
    public boolean business_validation;
    public boolean trade_enrichment;
   }

请注意，有一个默认的空构造函数和一个包含所有字段的构造函数。

import java.time.Instant;

import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.inject.Produces;

import org.apache.kafka.common.serialization.Serdes;
import org.apache.kafka.streams.StreamsBuilder;
import org.apache.kafka.streams.Topology;
import org.apache.kafka.streams.kstream.Consumed;
import org.apache.kafka.streams.kstream.GlobalKTable;
import org.apache.kafka.streams.kstream.Materialized;
import org.apache.kafka.streams.kstream.Produced;
import org.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
import org.apache.kafka.streams.state.Stores;

import io.quarkus.kafka.client.serialization.JsonbSerde;
import io.quarkus.kafka.client.serialization.JsonbSerializer;


@ApplicationScoped
public class ComplianceTopology {

    private static final String KTABLE_TOPIC = "kstreams-ktable-topic";
    private static final String INCOMING_TOPIC = "kstreams-incoming-test";
    private static final String OUTGOING_TOPIC = "kstreams-outgoing-test";


    @Produces
    public Topology buildTopology() {

        StreamsBuilder builder = new StreamsBuilder();

        JsonbSerde<FinancialMessage> financialMessageSerde = new JsonbSerde<>(FinancialMessage.class);

        builder.stream(
            INCOMING_TOPIC,
            Consumed.with(Serdes.Integer(), financialMessageSerde)
        )
        .filter(
            (key, message) -> checkCompliance(message)
        )
        .mapValues (
            checkedMessage -> performComplianceCheck(checkedMessage)
        )
        .to (
            INCOMING_TOPIC,
            Produced.with(Serdes.Integer(), financialMessageSerde)
        );  
        
        return builder.build();
    }

    public boolean checkCompliance (FinancialMessage rawMessage) {
        return (rawMessage.compliance_services);
    }

    public FinancialMessage performComplianceCheck(FinancialMessage checkedMessage) {
        checkedMessage.compliance_services = false;

        return checkedMessage;
    }

}

但是，我猜它被称为“毒丸”，但从 MQ 生成的一条有效负载为“Aloha”的消息破坏了它，我无法反序列化它。我猜其原因是“Aloha”未被识别为字符串，因为它位于单引号中。我无权了解该数据是如何发送的，因为它是通过 MQ 发送的。有没有办法跳过处理这个不可反序列化的消息并继续从主题进行处理？

Answer 1

如错误消息所示

please set the default.deserialization.exception.handler appropriately

您可以配置不同的反序列化异常处理程序来跳过无法反序列化的消息。

查看文档了解更多详细信息：https://kafka.apache.org/documentation/streams/developer-guide/config-streams.html#default-deserialization-exception-handler