Schema Registry Subjects

Learn how to manage SchemaRegistry Subjects.

Tags:

SchemaRegistrySubject resources are used to define the subject schemas you want to manage on your SchemaRegistry. A SchemaRegistrySubject resource defines the schema, the compatibility level, and the references to be associated with a subject version.

Definition Format of `SchemaRegistrySubject`

Below is the overall structure of the SchemaRegistrySubject resource.

apiVersion: "schemaregistry.jikkou.io/v1beta2"  # The api version (required)
kind: "SchemaRegistrySubject"                   # The resource kind (required)
metadata:
  name: <The name of the subject>               # (required)
  labels: { }
  annotations: { }
spec:
  schemaRegistry:
    vendor: <vendor_name>                       # (optional) The vendor of the SchemaRegistry, e.g., Confluent, Karapace, etc
  compatibilityLevel: <compatibility_level>     # (optional) The schema compatibility level for this subject.
  schemaType: <The schema format>               # (required) Accepted values are: AVRO, PROTOBUF, JSON
  schema:
    $ref: <url or path>  # 
  references: # Specifies the names of referenced schemas (optional array).
    - name: <string>                             # The name for the reference.
      subject: <string>                          # The subject under which the referenced schema is registered.
      version: <string>                          # The exact version of the schema under the registered subject.
]

Metadata

The metadata.name property is mandatory and specifies the name of the Subject.

Specification

To use the SchemaRegistry default values for the compatibilityLevel you can omit the property.

Example

Here is a simple example that shows how to define a single subject AVRO schema for type using the SchemaRegistrySubject resource type.

file: subject-user.yaml

---
apiVersion: "schemaregistry.jikkou.io/v1beta2"
kind: "SchemaRegistrySubject"
metadata:
  name: "User"
  labels: { }
  annotations:
    schemaregistry.jikkou.io/normalize-schema: true
spec:
  compatibilityLevel: "FULL_TRANSITIVE"
  schemaType: "AVRO"
  schema:
    $ref: ./user-schema.avsc

file: user-schema.avsc

---
{
  "namespace": "example.avro",
  "type": "record",
  "name": "User",
  "fields": [
    {
      "name": "name",
      "type": [ "null", "string" ],
      "default": null,
    },
    {
      "name": "favorite_number",
      "type": [ "null", "int" ],
      "default": null
    },
    {
      "name": "favorite_color",
      "type": [ "null", "string" ],
      "default": null
    }
  ]
}

Alternatively, we can directly pass the Avro schema as follows :