[jira] [Commented] (KAFKA-12925) prefixScan missing from intermediate interfaces

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

    [ https://issues.apache.org/jira/browse/KAFKA-12925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17360467#comment-17360467 ] 

Matthias J. Sax commented on KAFKA-12925:
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[~sagarrao] [~cadonna] [~guozhang] – I had a quick look into this, and it seems `prefixScan` is fundamentally "broken" and unusable?

We have a lot of internal "wrapper" classes that implement the base interface and none of them implements the new method to forward the corresponding calls... Seems having a default implementation hid this issue on the original PR...

> prefixScan missing from intermediate interfaces
> -----------------------------------------------
>
>                 Key: KAFKA-12925
>                 URL: https://issues.apache.org/jira/browse/KAFKA-12925
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 2.8.0
>            Reporter: Michael Viamari
>            Priority: Major
>
> [KIP-614|https://cwiki.apache.org/confluence/display/KAFKA/KIP-614%3A+Add+Prefix+Scan+support+for+State+Stores] and [KAFKA-10648|https://issues.apache.org/jira/browse/KAFKA-10648] introduced support for {{prefixScan}} to StateStores.
> It seems that many of the intermediate {{StateStore}} interfaces are missing a definition for {{prefixScan}}, and as such is not accessible in all cases.
> For example, when accessing the state stores through a the processor context, the {{KeyValueStoreReadWriteDecorator}} and associated interfaces do not define {{prefixScan}} and it falls back to the default implementation in {{KeyValueStore}}, which throws {{UnsupportedOperationException}}.



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