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https://issues.apache.org/jira/browse/KAFKA-16875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17937689#comment-17937689
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Lorcan commented on KAFKA-16875:
--------------------------------

Just posting the referenced PR where this post processing was implemented:

https://github.com/apache/kafka/pull/16002

> Replace ClientState with TaskAssignment when creating individual consumer 
> Assignments
> -------------------------------------------------------------------------------------
>
>                 Key: KAFKA-16875
>                 URL: https://issues.apache.org/jira/browse/KAFKA-16875
>             Project: Kafka
>          Issue Type: Sub-task
>          Components: streams
>            Reporter: A. Sophie Blee-Goldman
>            Priority: Major
>
> In the initial implementation of KIP-924 in version 3.8, we converted from 
> the new TaskAssignor's output type (TaskAssignment) into the old 
> ClientState-based assignment representation. This allowed us to plug in a 
> custom assignor without converting all the internal mechanisms that occur 
> after the KafkaStreams client level assignment and process it into a consumer 
> level assignment.
> However we ultimately want to get rid of ClientState altogether, so we need 
> to invert this logic so that we instead convert the ClientState into a 
> TaskAssignment and then use the TaskAssignment to process the assigned tasks 
> into consumer Assignments



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