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https://issues.apache.org/jira/browse/KAFKA-409?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jay Kreps resolved KAFKA-409.
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       Resolution: Fixed
    Fix Version/s: 0.9.0

Instead we rewrote it.

> Refactor DefaultEventHandler 
> -----------------------------
>
>                 Key: KAFKA-409
>                 URL: https://issues.apache.org/jira/browse/KAFKA-409
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 0.8.0
>            Reporter: Neha Narkhede
>            Assignee: Jay Kreps
>              Labels: optimization
>             Fix For: 0.9.0
>
>
> The code in DefaultEventHandler has evolved to be a big blob of complex 
> procedural logic. This is difficult to understand and read. Particularly the 
> partitionAndCollate() API returns a nested complex data structure 
> Option[Map[Int, Map[(String, Int), Seq[ProducerData[K,Message]]]]]. This 
> class would definitely benefit from a refactor



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