Using the Schema Registry

The Schema Registry is a repository. It is a metadata-serving layer for schemas. It provides a REST interface for storing and retrieving Avro schemas. It has a versioned history of schemas and provides compatibility analysis to leverage schema evolution based on that compatibility.

Remember that the Schema Registry has a REST interface; so, in this recipe, we use Java to make HTTP requests, but it is precisely a REST interface used to promote language and platform neutrality.

Getting ready

The Confluent Platform should be up and running:

$ confluent start schema-registry

How to do it...

Remember the Customer sees BTC price Avro schema of Doubloon:

{ "name": "customer_sees_btcprice", 
  "namespace": "doubloon.avro", 
  "type": "record", 
  "fields": [ 
    { "name": "event", "type": "string" }, 
    { "name": "customer",  
      "type": { 
          "name": "id", "type": "long", 
          "name": "name", "type": "string", 
          "name": "ipAddress", "type": "string...