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https://issues.apache.org/jira/browse/KAFKA-4325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16657979#comment-16657979
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Matthias J. Sax commented on KAFKA-4325:
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[~vvcephei], I think, this is resolved with the new strict enforcement of
retention time you worked on? Can you confirm? Do we have a ticket for it so we
can resolve this as "included in KAFKA-xxx" ?
> Improve processing of late records for window operations
> --------------------------------------------------------
>
> Key: KAFKA-4325
> URL: https://issues.apache.org/jira/browse/KAFKA-4325
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Matthias J. Sax
> Priority: Minor
>
> Windows are kept until their retention time passed. If a late arriving record
> is processed that is older than any window kept, a new window is created
> containing this single late arriving record, the aggregation is computed and
> the window is immediately discarded afterward (as it is older than retention
> time).
> This behavior might case problems for downstream application as the original
> window aggregate might we overwritten with the late single-record- aggregate
> value. Thus, we should rather not process the late arriving record for this
> case.
> However, data loss might not be acceptable for all use cases. In order to
> enable the use to not lose any data, window operators should allow to
> register a handler function that is called instead of just dropping the late
> arriving record.
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