{
	"namespace": "com.kafkadefinitiveguide.producer.serializer.avroserializer",
 	"type": "record",
 	"name": "Customer",
 	"fields": [
     	{"name": "id", "type": "int"},
     	{"name": "name",  "type": "string"},
     	{"name": "email", "type": ["string", "null"], "default": "null"}
 ]
}