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https://issues.apache.org/jira/browse/KAFKA-4729?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax resolved KAFKA-4729.
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Resolution: Duplicate
> Stores for kstream-kstream join cannot be in-memory
> ---------------------------------------------------
>
> Key: KAFKA-4729
> URL: https://issues.apache.org/jira/browse/KAFKA-4729
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Affects Versions: 0.10.2.0
> Reporter: Eno Thereska
> Priority: Major
>
> Whereas we can specify in the DSL that stores used for aggregates can be
> RocksDb-based on in-memory, we cannot do that for stores used for
> KStream-KStream joins. E.g., the join() methon in KStreamImpl.java creates
> two state stores and the user does not have the option of having them be
> in-memory:
> StateStoreSupplier thisWindow =
> createWindowedStateStore(windows, keySerde, lhsValueSerde,
> joinThisName + "-store");
> StateStoreSupplier otherWindow =
> createWindowedStateStore(windows, keySerde, otherValueSerde,
> joinOtherName + "-store");
> Part of the problem is that for joins, stores are not exposed to the user. We
> might want to rethink that.
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