[jira] [Commented] (KAFKA-4731) Add event-based session windows

["Bill Bejeck (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-4731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15855204#comment-15855204 ] 

Bill Bejeck commented on KAFKA-4731:
------------------------------------

[~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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