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Posted to jira@kafka.apache.org by "Dongjin Lee (Jira)" <ji...@apache.org> on 2020/01/03 01:50:00 UTC
[jira] [Resolved] (KAFKA-8553) Kafka Connect Schema Compatibility
Checks for Name Changes
[ https://issues.apache.org/jira/browse/KAFKA-8553?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dongjin Lee resolved KAFKA-8553.
--------------------------------
Resolution: Not A Problem
In Kafka Connect, there are two kinds of 'schema's:
1. Avro schema, which is used in serializing/deserializing Kafka Records (i.e., {{ProducerRecord}}, {{ConsumerRecord}})
2. Connect schema, which is used to support the Transformer feature (i.e., {{ConnectRecord}}).
To support the evolution of second type schemas, Kafka Connect provides utility functions like {{SchemaProjector#project}}. Since this schema has nothing to do with Avro schema, it has a totally different notion of compatibility. (I agree, it is easy to confusing.)
> Kafka Connect Schema Compatibility Checks for Name Changes
> ----------------------------------------------------------
>
> Key: KAFKA-8553
> URL: https://issues.apache.org/jira/browse/KAFKA-8553
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Reporter: Omer van Kloeten
> Priority: Major
> Attachments: foo1.png, image-2019-06-18-14-59-54-643.png
>
>
> {{SchemaProjector.checkMaybeCompatible}} checks whether the Connect schema is compatible with another one. This is used for projection when using {{schema.compatibility}}.
> Unfortunately, nowhere is it documented that if you change the name of the schema, this would break compatibility entirely.
> For instance, the following two Avro schemas are fully compatible, but Connect says they're not:
> !foo1.png!!image-2019-06-18-14-59-54-643.png!
> This is either the expected behavior and is not documented or unexpected behavior and is an issue with the implementation.
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