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https://issues.apache.org/jira/browse/KAFKA-4731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15855204#comment-15855204
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Bill Bejeck commented on KAFKA-4731:
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[~mjsax] Is this Jira pending any further API redesign discussions? If not I'd
like to give this a shot.
> Add event-based session windows
> -------------------------------
>
> Key: KAFKA-4731
> URL: https://issues.apache.org/jira/browse/KAFKA-4731
> Project: Kafka
> Issue Type: New Feature
> Components: streams
> Reporter: Matthias J. Sax
> Priority: Minor
> Labels: needs-kip
>
> Kafka Streams allows to define session windows based on an time-based
> inactivity gap. This can be used for _session detection_.
> However, some data streams do contain event like "start session" and "end
> session" to mark the begin and end of a session. For this use case, it is not
> required to _detect_ session because session boundaries are known and not
> based on time -- but on events.
> This Jira is about adding support for those event-based session windows. To
> add this feature, a KIP
> (https://cwiki.apache.org/confluence/display/KAFKA/Kafka+Improvement+Proposals)
> is required to discuss the proposed design.
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