[jira] [Commented] (KAFKA-4729) Stores for kstream-kstream join cannot be in-memory

["Matthias J. Sax (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-4729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16250719#comment-16250719 ] 

Matthias J. Sax commented on KAFKA-4729:
----------------------------------------

Is this resolved via KAFKA-5651 \cc [~guozhang] [~damianguy]

> 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
>             Fix For: 1.1.0
>
>
> 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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