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https://issues.apache.org/jira/browse/KAFKA-2367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14696072#comment-14696072
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James Cheng commented on KAFKA-2367:
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Using Avro makes sense to me, instead of writing something ourselves. As 
[~gwenshap] pointed out, it seems to do most of what we need: allow building a 
runtime schema, and allow building data objects that match that schema. And 
using Avro means we wouldn't have to maintain our own thing.


> Add Copycat runtime data API
> ----------------------------
>
>                 Key: KAFKA-2367
>                 URL: https://issues.apache.org/jira/browse/KAFKA-2367
>             Project: Kafka
>          Issue Type: Sub-task
>          Components: copycat
>            Reporter: Ewen Cheslack-Postava
>            Assignee: Ewen Cheslack-Postava
>             Fix For: 0.8.3
>
>
> Design the API used for runtime data in Copycat. This API is used to 
> construct schemas and records that Copycat processes. This needs to be a 
> fairly general data model (think Avro, JSON, Protobufs, Thrift) in order to 
> support complex, varied data types that may be input from/output to many data 
> systems.
> This should issue should also address the serialization interfaces used 
> within Copycat, which translate the runtime data into serialized byte[] form. 
> It is important that these be considered together because the data format can 
> be used in multiple ways (records, partition IDs, partition offsets), so it 
> and the corresponding serializers must be sufficient for all these use cases.



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