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https://issues.apache.org/jira/browse/KAFKA-4730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15956097#comment-15956097
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Nikki Thean commented on KAFKA-4730:
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Hi [~enothereska], I'm interested in this ticket. What kind of data structure
were you thinking of / would you suggest for the implementation of in-memory
windowed stores? Composite keys for the Map the general implementation uses,
separate key-value stores for each time segment, or something else?
> Streams does not have an in-memory windowed store
> -------------------------------------------------
>
> Key: KAFKA-4730
> URL: https://issues.apache.org/jira/browse/KAFKA-4730
> Project: Kafka
> Issue Type: New Feature
> Components: streams
> Affects Versions: 0.10.2.0
> Reporter: Eno Thereska
> Fix For: 0.11.0.0
>
>
> Streams has windowed persistent stores (e.g., see PersistentKeyValueFactory
> interface with "windowed" method), however it does not allow for windowed
> in-memory stores (e.g., see InMemoryKeyValueFactory interface).
> In addition to the interface not allowing it, streams does not actually have
> an implementation of an in-memory windowed store.
> The implications are that operations that require windowing cannot use
> in-memory stores.
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