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https://issues.apache.org/jira/browse/KAFKA-8613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16936225#comment-16936225
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Bruno Cadonna commented on KAFKA-8613:
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Hi [~vvcephei],
I might have been focusing too much on the suppress case when I opened this
ticket. Thinking about it again, I would still expect the grace period to be 0
if I do not specify anything. Any other default value I would need to remember.
Making grace period required would also be fine because it better document the
Streams app, IMO.
> Set default grace period to 0
> -----------------------------
>
> Key: KAFKA-8613
> URL: https://issues.apache.org/jira/browse/KAFKA-8613
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Bruno Cadonna
> Priority: Blocker
> 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 set the default grace period to
> {{Duration.ZERO}}.
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