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https://issues.apache.org/jira/browse/KAFKA-7106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16526451#comment-16526451
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John Roesler commented on KAFKA-7106:
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Just preserving a comment from Guozhang:
{quote}This is a meta comment: currently we are leaking some segmented bytes
store specific information into the general interface, such as
{{segmentInterval}}, {{retainDuplicates}}. Suppose a user customized window
bytes store, it does not necessarily need to be segmented at all. In addition,
the {{windowSize}} and {{retentionPeriod}} are used today only because
library's specific caching / logging layer relies on it, which is not generally
applicable.
Ideally all of these parameters should not need to be instantiated by users, we
could consider refactoring them a bit for better custom store support.
{quote}
This was on https://github.com/apache/kafka/pull/5257
> Remove segment/segmentInterval from Window definition
> -----------------------------------------------------
>
> Key: KAFKA-7106
> URL: https://issues.apache.org/jira/browse/KAFKA-7106
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: John Roesler
> Priority: Minor
> Labels: needs-kip
>
> Currently, Window configures segment and segmentInterval properties, but
> these aren't truly properties of a window in general.
> Rather, they are properties of the particular implementation that we
> currently have: a segmented store. Therefore, these properties should be
> moved to configure only that implementation.
>
> This may be related to KAFKA-4730, since an in-memory window store wouldn't
> necessarily need to be segmented.
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