java - 卡夫卡 : Manually producing record triggers exception in consumer

Question

我有一个消费者从多个主题进行轮询。 到目前为止，我只使用 Java 对这些主题进行记录，一切都运行良好。

我将 confulent 工具与 avro 一起使用。

现在我尝试通过终端手动生成主题。

我创建了一个 avro 生产者，其架构与其他生产者使用的架构相同:

# Produce a record with one field
kafka-avro-console-producer \
  --broker-list 127.0.0.1:9092 --topic order_created-in \
  --property schema.registry.url=http://127.0.0.1:8081 \
  --property value.schema='{"type":"record","name":"test","fields":[{"name":"name","type":"string"},{"name":"APropertie","type":{"type":"array","items":{"type":"record","name":"APropertie","fields":[{"name":"key","type":"string"},{"name":"name","type":"string"},{"name":"date","type":"string"}]}}}]}'

之后，我生成一条遵循指定模式的记录:

{"name": "order_created", "APropertie": [{"key": "1", "name": "testname", "date": "testdate"}]}

记录已正确生成到主题。 但是我的 AvroConsumer 抛出异常:

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Exception in thread "main" org.apache.kafka.common.errors.SerializationException: Error deserializing key/value for partition order_created-in-0 at offset 1. If needed, please seek past the record to continue consumption.
Caused by: org.apache.kafka.common.errors.SerializationException: Error deserializing Avro message for id 61
Caused by: org.apache.kafka.common.errors.SerializationException: Could not find class test specified in writer's schema whilst finding reader's schema for a SpecificRecord.

Process finished with exit code 1

有什么提示吗？ 谢谢!

Answer 1

与生产者/消费者的配置有关。

普通生产者有这样的配置:

        // normal producer
        properties.setProperty("bootstrap.servers", "127.0.0.1:9092");
        properties.setProperty("acks", "all");
        properties.setProperty("retries", "10");

Avro 通常添加以下属性:

        // avro part
        properties.setProperty("key.serializer", StringSerializer.class.getName());
        properties.setProperty("value.serializer", KafkaAvroSerializer.class.getName());
        properties.setProperty("schema.registry.url", "http://127.0.0.1:8081");
        properties.setProperty("confluent.value.schema.validation", "true");
        properties.setProperty("confluent.key.schema.validation", "true");

这些必须包含在控制台生成器中。