What is schema registry in Pulsar?

Pulsar has a built-in schema registry that lets producers and consumers agree on message structure - supporting Avro, JSON, Protobuf, and plain primitives - without operating a separate schema service.

When a producer with a defined schema publishes to a topic, Pulsar validates and stores that schema version; consumers can then deserialize messages using the matching schema automatically instead of hand-parsing bytes.

Schema compatibility checks (backward, forward, full) can be enforced per topic, preventing an incompatible producer from breaking existing consumers when the message format evolves.

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