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https://issues.apache.org/jira/browse/KAFKA-3055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15288056#comment-15288056
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Christian Posta commented on KAFKA-3055:
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the correct config for the worker to change the cache size is
value.converter.schemas.cache.size
Need to have this fixed before you can use it though:
https://issues.apache.org/jira/browse/KAFKA-3723
> JsonConverter mangles schema during serialization (fromConnectData)
> -------------------------------------------------------------------
>
> Key: KAFKA-3055
> URL: https://issues.apache.org/jira/browse/KAFKA-3055
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Affects Versions: 0.9.0.0
> Reporter: Kishore Senji
> Assignee: Ewen Cheslack-Postava
> Fix For: 0.9.0.1, 0.10.0.0
>
>
> 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):
> {code}
> {"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}}
> {code}
> where as when caching is enabled the same Struct gets serialized as (with
> caching enabled) :
> {code}
> {"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}}
> {code}
> As we can see all String fields became "email" and all int32 fields became
> "weightInKgs".
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