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https://issues.apache.org/jira/browse/KAFKA-4587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17069241#comment-17069241
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Maatari commented on KAFKA-4587:
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Hi all, i'm note sure to follow what is the status of this ticket. Is it still 
relevant ?

> Rethink Unification of Caching with Dedupping
> ---------------------------------------------
>
>                 Key: KAFKA-4587
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4587
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>            Reporter: Guozhang Wang
>            Priority: Major
>
> This is discussed in PR https://github.com/apache/kafka/pull/1588
> In order to support user-customizable state store suppliers in the DSL we did 
> the following:
> 1) Introduce a {{TupleForwarder}} to forward tuples from cached stores that 
> is wrapping user customized stores.
> 2) Narrow the scope to only dedup on forwarding if it is the default 
> CachingXXStore with wrapper RocksDB. 
> With this, the unification of dedupping and caching is less useful now, and 
> we are complicating the inner implementations for forwarding a lot. We need 
> to re-consider this feature with finer granularity of turning on / off 
> caching per store, potentially with explicit triggers.



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