Kishore Senji created KAFKA-3055:
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Summary: JsonConverter mangles schema during serialization
(fromConnectData)
Key: KAFKA-3055
URL: https://issues.apache.org/jira/browse/KAFKA-3055
Project: Kafka
Issue Type: Bug
Components: copycat
Affects Versions: 0.9.0.0
Reporter: Kishore Senji
Assignee: Ewen Cheslack-Postava
Test case is here:
https://github.com/ksenji/kafka-connect-test/tree/master/src/test/java/org/apache/kafka/connect/json
If Caching is disabled, it behaves correctly and JsonConverterWithNoCacheTest
runs successfully. Otherwise the test JsonConverterTest fails.
The reason is that the JsonConverter has a bug where it mangles the schema as
it assigns all String fields with the same name (and similar for all Int32
fields)
This is how the schema & payload gets serialized for the Person Struct (with
caching disabled):
{"schema":{"type":"struct","fields":[{"type":"string","optional":false,"field":"firstName"},{"type":"string","optional":false,"field":"lastName"},{"type":"string","optional":false,"field":"email"},{"type":"int32","optional":false,"field":"age"},{"type":"int32","optional":false,"field":"weightInKgs"}],"optional":false,"name":"Person"},"payload":{"firstName":"Eric","lastName":"Cartman","email":"eric.cart...@southpark.com","age":10,"weightInKgs":40}}
where as when caching is enabled the same Struct gets serialized as (with
caching enabled) :
{"schema":{"type":"struct","fields":[{"type":"string","optional":false,"field":"email"},{"type":"string","optional":false,"field":"email"},{"type":"string","optional":false,"field":"email"},{"type":"int32","optional":false,"field":"weightInKgs"},{"type":"int32","optional":false,"field":"weightInKgs"}],"optional":false,"name":"Person"},"payload":{"firstName":"Eric","lastName":"Cartman","email":"eric.cart...@southpark.com","age":10,"weightInKgs":40}}
As we can see all String fields became "email" and all int32 fields became
"weightInKgs".
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