How To Convert The Simple Integer Key Of A Kafka Stream To A Complex Avro Type Key Mới Update

To convert a simple integer key of a Kafka stream to a complex Avro type key, you will need to define an Avro schema that describes the structure of the complex key. Once you have defined the schema, you can use an Avro serializer to serialize the integer key to the Avro format using the schema you defined. Here are the steps you can follow:

1. Define an Avro schema that describes the structure of the complex key. The schema should include a field for the integer key. For example, here is an Avro schema that defines a complex key with an integer field named “id”:

json
{
  "namespace": "com.example",
  "type": "record",
  "name": "ComplexKey",
  "fields": [
    {"name": "id", "type": "int"}
  ]
}

1. Use the Avro schema to generate Avro classes using a code generation tool like Avro Maven plugin or Avro Gradle plugin.

2. Use the Avro serializer to serialize the integer key to the Avro format using the schema you defined. Here is some sample Java code that shows how to serialize an integer key to Avro:

scss
// create a ComplexKey object
ComplexKey complexKey = new ComplexKey();
complexKey.setId(42);

// create an Avro serializer
Schema schema = ComplexKey.getClassSchema();
ByteArrayOutputStream out = new ByteArrayOutputStream();
Encoder encoder = EncoderFactory.get().binaryEncoder(out, null);
SpecificDatumWriter<ComplexKey> writer = new SpecificDatumWriter<ComplexKey>(schema);

// serialize the ComplexKey object to Avro
writer.write(complexKey, encoder);
encoder.flush();

// get the serialized Avro bytes
byte[] serializedBytes = out.toByteArray();

In this example, we first create a ComplexKey object with the integer key value of 42. We then create an Avro serializer using the ComplexKey schema and use it to serialize the object to Avro format. The serialized Avro bytes can then be used as the key in a Kafka stream with a ProducerRecord object.