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https://issues.apache.org/jira/browse/KAFKA-15629?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax updated KAFKA-15629:
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Labels: kip (was: )
> proposal to introduce IQv2 Query Types: TimeStampKeyQuery and
> TimeStampRangeQuery
> ---------------------------------------------------------------------------------
>
> Key: KAFKA-15629
> URL: https://issues.apache.org/jira/browse/KAFKA-15629
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Hanyu Zheng
> Assignee: Hanyu Zheng
> Priority: Major
> Labels: kip
>
> In the current IQv2 code, there are noticeable differences when interfacing
> with plain-kv-store and ts-kv-store. Notably, the return type V acts as a
> simple value for plain-kv-store but evolves into ValueAndTimestamp<V> for
> ts-kv-store, which presents type safety issues in the API.
> Even if IQv2 hasn't gained widespread adoption, an immediate fix might bring
> compatibility concerns.
> This brings us to the essence of our proposal: the introduction of distinct
> query types. One that returns a plain value, another for values accompanied
> by timestamps.
> While querying a ts-kv-store for a plain value and then extracting it is
> feasible, it doesn't make sense to query a plain-kv-store for a
> ValueAndTimestamp<V>.
> Our vision is for plain-kv-store to always return V, while ts-kv-store should
> return ValueAndTimestamp<V>.
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