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https://issues.apache.org/jira/browse/KAFKA-4587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16608655#comment-16608655
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Matthias J. Sax commented on KAFKA-4587:
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[~guozhang] I think we should move this to fixed version 2.2.0 ?
> 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
> Fix For: 2.1.0
>
>
> 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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