Question

I do have a number of queries about AVRO schema.

I have read that, we need to pass a schema id and the message in the Kafka event.The body of my Kafka event is like -

{ “componentName”：“ABC”， //一些更多的领域， “有效载荷”：{ “名字”：“xyz”， “年龄”：“23” } }

In payload field, we provide the actual data. Here, where will I provide the schema id. I found one answer related to this at [link][1] 


  [1]: https://stackoverflow.com/questions/31204201/apache-kafka-with-avro-and-schema-repo-where-in-the-message-does-the-schema-id,

表示有编码器采用模式并从模式注册表中找到它的模式ID。这个编码器序列化器还是不同的？我们是否还需要在我们发送的消息中嵌入架构？编码器将如何选择架构？

Do we need to explicitly register schema in schema registry as said on this [link][1] 

Also, how will we associate a schema with a topic name?

Answer 1

我今天正好在看这个，看来模式ID被编码为消息的前几个字节。

对键或值进行反序列化（code）时：

ByteArrayOutputStream out = new ByteArrayOutputStream();
out.write(0);
out.write(ByteBuffer.allocate(4).putInt(e).array());

序列化（code）时：

ByteBuffer e = this.getByteBuffer(payload);
int id1 = e.getInt();
Schema schema = this.schemaRegistry.getById(id1);

带有AVRO的Apache kafka，架构ID中的消息在哪里？

1 个答案: