Question 1

How to set up Schema Registry with a local Kafka cluster?

Accepted Answer

You can run Schema Registry against a local Kafka cluster using Maven with 'mvn exec:java' and a properties file, as shown in the Development section, or use prebuilt versions from Confluent Platform for production deployments with detailed configuration guides.

Question 2

What are the compatibility modes in Schema Registry and when to use them?

Accepted Answer

Schema Registry supports modes like BACKWARD, FORWARD, and NONE, which control how new schema versions can evolve. BACKWARD ensures new schemas are compatible with older ones, useful for consumer upgrades, while NONE allows any changes but risks breaking consumers.

Question 3

Schema Registry vs Apache Avro's built-in schema management?

Accepted Answer

Schema Registry provides centralized, multi-format support with REST API and compatibility validation, whereas Avro's built-in tools are more limited to Avro format and lack a dedicated service for versioning and governance in distributed Kafka environments.

Question 4

How to test if a new schema is compatible in Schema Registry?

Accepted Answer

Use the compatibility endpoint via HTTP POST, as demonstrated in the quickstart examples, to validate a schema against the latest version under a subject, returning a boolean indicating if changes are safe according to configured rules.

Question 5

Can I use Schema Registry without Confluent Cloud or paid tools?

Accepted Answer

Yes, it's open-source and can be self-hosted with Kafka, but some features or integrations might be optimized for Confluent Platform, and the community version has limitations compared to the commercial offering in terms of scalability and support.

Question 6

What happens if Schema Registry goes down in a Kafka pipeline?

Accepted Answer

If Schema Registry is unavailable, Kafka clients relying on it for serialization may fail to produce or consume messages, causing pipeline disruptions. It's critical to implement high availability setups, such as clustering, as suggested in deployment documentation.

Confluent Schema registry for Kafka

What is Confluent Schema registry for Kafka?

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