Schema id
A schema ID is an identifier assigned by a schema registry to a registered schema or schema version.
Kafka Streams in Action, Second Edition
A schema identifier is a unique numeric identifier assigned by Schema Registry to a registered schema.
- How it is used
- Pins ksqlDB stream keys or values to an exact Schema Registry schema when applications share a topic.
- How deep it goes
- Defines IDs through registration responses and demonstrates supplying one in a ksqlDB WITH clause, deferring broader format details.
- Examples
- Uses an Avengers schema registration returning id 1 and a user_activity Avro stream configured with value_schema_id = 1.
- What you can do after
- Operate/configure ksqlDB to retrieve a precise registered schema version for an Avro stream.
Read how Kafka Streams in Action, Second Edition explains schema id →
Kafka for Architects
A schema identifier is a unique value associated with a registered schema and embedded or referenced in serialized data.
- How it is used
- Coordinates producer serialization and consumer deserialization through a registered schema lookup.
- How deep it goes
- Explains registration, embedding, caching, lookup, validation boundaries, and cross-environment migration risks.
- Examples
- Uses a REST lookup for ID 1 and diagrams showing producer embedding and consumer retrieval.
- What you can do after
- Operate/configure clients that embed, retrieve, cache, and apply schema IDs during serialized message exchange.
Related concepts
- schema registryproduced by · A schema registry is a service that stores, versions, and provides schemas for structured data, often validating compatibility between schema versions.
- migrationused by · A migration is a process of transferring or transforming data, software, or system state from a source form or environment to a target form or environment.
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