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https://issues.apache.org/jira/browse/KAFKA-8613?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax resolved KAFKA-8613.
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Resolution: Fixed
> Make grace period mandatory
> ---------------------------
>
> Key: KAFKA-8613
> URL: https://issues.apache.org/jira/browse/KAFKA-8613
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Bruno Cadonna
> Assignee: Israel Ekpo
> Priority: Blocker
> Labels: kip
> Fix For: 3.0.0
>
>
> Currently, the grace period is set to retention time if the grace period is
> not specified explicitly. The reason for setting the default grace period to
> retention time was backward compatibility. Topologies that were implemented
> before the introduction of the grace period, added late arriving records to a
> window as long as the window existed, i.e., as long as its retention time was
> not elapsed.
> This unintuitive default grace period has already caused confusion among
> users.
> For the next major release, we should consider to set the default grace
> period to {{Duration.ZERO}}. or to make it a mandatory parameter.
>
> KIP-633
> [https://cwiki.apache.org/confluence/display/KAFKA/KIP-633%3A+Drop+24+hour+default+of+grace+period+in+Streams]
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