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https://issues.apache.org/jira/browse/KAFKA-15215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17746106#comment-17746106
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Guozhang Wang commented on KAFKA-15215:
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Just realized I have not read the KIP! :) At first glance it seems we are on
similar pages.
Will read it through asap. Also updated the KIP link in this JIRA.
> The default.dsl.store config is not compatible with custom state stores
> -----------------------------------------------------------------------
>
> Key: KAFKA-15215
> URL: https://issues.apache.org/jira/browse/KAFKA-15215
> Project: Kafka
> Issue Type: New Feature
> Components: streams
> Reporter: A. Sophie Blee-Goldman
> Assignee: Almog Gavra
> Priority: Major
> Labels: needs-kip
>
> Sort of a bug, sort of a new/missing feature. When we added the long-awaited
> default.dsl.store config, it was decided to scope the initial KIP to just the
> two out-of-the-box state stores types offered by Streams, rocksdb and
> in-memory. The reason being that this would address a large number of the
> relevant use cases, and could always be followed up with another KIP for
> custom state stores if/when the demand arose.
> Of course, since rocksdb is the default anyways, the only beneficiaries of
> this KIP right now are the people who specifically want only in-memory stores
> – yet custom state stores users are probably by far the ones with the
> greatest need for an easier way to configure the store type across an entire
> application. And unfortunately, because the config currently relies on enum
> definitions for the known OOTB store types, there's not really any way to
> extend this feature as it is to work with custom implementations.
> I think this is a great feature, which is why I hope to see it extended to
> the broader user base. Most likely we'll want to introduce a new config for
> this, though whether it replaces the old default.dsl.store config or
> complements it will have to be decided during the KIP discussion
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