[jira] [Commented] (KAFKA-3055) JsonConverter mangles schema during serialization (fromConnectData)

["Kishore Senji (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-3055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15076222#comment-15076222 ] 

Kishore Senji commented on KAFKA-3055:
--------------------------------------

PR: https://github.com/apache/kafka/pull/722

> 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):
> {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.cartman@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.cartman@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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