apache kafka - Schema Registry allowing weird avro schema change

Question

I’m setting a subject to full_transitive compat mode. It contains a nested avro schema and schema registry is allowing some changes that seem to be breaking to me. My schema contains this

.....
                            {
                                "name": "address",
                                "type": [
                                  "null",
                                  {
                                    "type": "record",
                                    "name": "AvroAddress",
                                    "fields": [
                                      {
                                        "name": "address",
                                        "type": [
                                          "null",
                                          {
                                            "type": "string",
                                            "avro.java.string": "String"
                                          }
                                        ],
                                        "doc": "...",
                                        "default": null
                                      },
                                      {
                                        "name": "country",
                                        "type": {
                                          "type": "string",
                                          "avro.java.string": "String"
                                        },
                                        "doc": "..."
                                      }
                                    ]
                                  }
                                ],
                                "default": null
                              }, 
...

As you can see here the country field doesn’t have a default value but the Schema Registry allows me to update its name. Is it because it is contained itself within a nullable field ? How an old consumer would react to this ? What am I missing here please ?

question from:https://stackoverflow.com/questions/65847163/schema-registry-allowing-weird-avro-schema-change

Answer 1

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